Deck 4: Gravity, Projectiles, and Satellites

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Question
What is the magnitude and direction of the gravitational force that acts on a person who weighs 500 N at the Earth's surface?
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Question
If the masses of two planets doubles and the distance between them also doubles, the force between them would be

A)one-quarter.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
Question
Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

A)increases.
B)decreases.
C)remains constant.
Question
Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them doesn't change, then the force between them is

A)one-quarter.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
Question
If your mass remains unchanged while both the mass of Earth and its radius doubles, your weight

A)remains the same.
B)doubles.
C)quadruples.
D)increases by eight times.
E)reduces by half.
Question
Two objects move toward each other due to gravity. As the objects get closer and closer, the acceleration of each

A)increases.
B)decreases.
C)remains constant.
Question
If your mass remained the same while the mass of Earth doubled while staying the same size, your weight would

A)be the same.
B)double.
C)quadruple.
D)be eight times as much as now.
E)none of the above
Question
According to Newton, the closer gravitationally interacting objects are to each other, the

A)less the gravitational force between them.
B)more the gravitational force between them.
C)constancy of the force between them.
Question
According to Newton, the greater the masses of interacting objects, the

A)less the gravitational force between them.
B)greater the gravitational force between them.
C)greater the force between them by the square of the masses.
Question
According to Newton, the greater the distance between gravitationally interacting objects, the

A)less the gravitational force between them.
B)more the gravitational force between them.
C)constancy of the force between them.
Question
If the Earth had twice its present radius and twice its present mass, what would happen to your weight? Explain.
Question
If the mass of Earth somehow increased with no change in radius, your weight would

A)increase also.
B)decrease.
C)remain the same.
Question
Newton discovered

A)gravity.
B)that gravity is universal.
C)neither
Question
If Earth's mass doubled with no change in radius, your weight would

A)increase by one-quarter.
B)double.
C)be four times as much.
D)none of the above
Question
Consider two planets in space that gravitationally attract each other. If the mass of one planet is doubled, and the distance between them doesn't change, then the force between them is

A)one-quarter.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
Question
How is stepping off a curb similar to taking a ride aboard the space shuttle?
Question
If the masses of two planets doubles and the distance between reduces by half, the force between them would be

A)unchanged.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
Question
The Earth and the Moon gravitationally attract each other. Does the more massive Earth attract the Moon with a greater force, the same force, or less force than the Moon attracts the Earth? What reasoning guides your answer?
Question
What is the force of gravity on a 500-N woman standing on Earth's surface?

A)50 N
B)250 N
C)500 N
D)598 N
E)5000 N
Question
If Earth's mass decreased to one-half its original mass with no change in radius, your weight would

A)decrease to one-quarter.
B)decrease to one-half.
C)remain the same.
D)none of the above
Question
A supplier wants to make a profit by buying gold by weight at one altitude and selling it at the same price per kilogram at another altitude. The supplier should

A)buy at a high altitude and sell at a low altitude.
B)buy at a low altitude and sell at a high altitude.
C)disregard altitude because it makes no difference.
Question
Passengers in a high-flying jumbo jet feel their normal weight in flight. Passengers in an orbiting space vehicle do not because passengers are

A)beyond the main pull of Earth's gravity.
B)above the Earth's atmosphere.
C)without support forces.
D)all the above
E)none of the above
Question
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground. Such twice-as-high apples of the same mass, have

A)1/4 the weight.
B)1/2 the weight.
C)practically the same weight.
Question
If the radius of the Earth somehow decreased with no change in mass, your weight would

A)increase.
B)not change.
C)decrease.
Question
An object is placed exactly halfway between the Earth and the Moon. The object will fall toward the

A)Earth.
B)Moon.
C)neither
Question
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same. This point is

A)nearer Earth.
B)nearer the Moon.
C)mid-way between Earth and the Moon.
D)none of the above
Question
When the distance between two stars doubles, the force between them

A)decreases by one-quarter.
B)decreases by one-half.
C)increases to twice as much.
D)increases to four times as much.
E)remains the same.
Question
If the Sun were twice as massive,

A)its pull on the Earth would double.
B)Earth's pull on the Sun would double.
C)both
D)neither
Question
Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper because the

A)gravitational force is shielded inside the building.
B)mass of the building attracts us upward slightly.
C)both
D)none of the above
Question
A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weigh there?

A)zero
B)100 N
C)200 N
D)400 N
E)none of the above
Question
In the vacuum of outer space, there is no

A)gravity.
B)atmospheric pressure.
C)both
Question
The amount of gravitational force that acts on a space vehicle that orbits Earth is

A)nearly zero.
B)nearly as much as the vehicle's weight on Earth's surface.
C)the same as the vehicle's weight on the Earth's surface.
Question
How far must one travel to completely be beyond Earth's gravity?

A)to a region above the Earth's atmosphere
B)to a region well beyond the Moon
C)to a region beyond the solar system
D)forget it; you can't travel far enough
Question
Inside a freely falling elevator you would experience no

A)gravitational force.
B)weight.
C)both
D)none of the above
Question
Inside a freely falling elevator your

A)acceleration is zero.
B)weight is zero.
C)gravitational interaction with Earth is zero.
D)all the above
E)none of the above
Question
When the distance between two stars decreases by half, the force between them

A)decreases by one-quarter.
B)decreases by one-half.
C)increases to twice as much.
D)increases to four times as much.
E)stays the same.
Question
The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much. This is because

A)your mass is 100 times less on Jupiter.
B)Jupiter is significantly farther from the Sun.
C)Jupiter's radius is 10 times Earth's radius.
D)you are 100 times more weightless there.
E)none of the above
Question
If the radius of the Earth somehow increased with no change in mass, your weight would

A)increase.
B)not change.
C)decrease.
Question
Weight can be simulated in a space vehicle if the vehicle is

A)falling.
B)in a circular orbit about Earth.
C)rotating.
D)none of the above
Question
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?

A)the force on A
B)the force on B
C)both forces are the same
Question
If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the total time to return to its starting position is

A)1 s.
B)2 s.
C)10 s.
D)20 s.
E)not enough information
Question
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity

A)increases.
B)remains unchanged.
C)decreases.
Question
Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it

A)gradually decreases until the ball reaches the top of its path.
B)first acts upward and then downward after reaching the top.
C)s only the force due to gravity, always directed downward.
D)none of the above
Question
A hunter fires a bullet from a horizontally-held rifle while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

A)the dropped one
B)the fired one
C)both hit at the same time
Question
A projectile is launched straight upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is

A)less than 50 m/s.
B)50 m/s.
C)more than 50 m/s.
Question
An object is thrown vertically into the air. Because of air resistance, the time for its descent will be

A)longer than the ascent time.
B)shorter than the ascent time.
C)equal to the ascent time.
D)not enough information
Question
Dwarf planet Pluto was discovered by perturbations of

A)Jupiter.
B)Saturn.
C)Uranus and Neptune.
D)all of the above
Question
A projectile is fired horizontally. With no air resistance it maintains its horizontal component of velocity because

A)no forces act on it.
B)no horizontal forces act on it.
C)of no initial vertical component of velocity.
D)all of the above
E)none of the above
Question
The planet Neptune was discovered by perturbations of

A)Uranus.
B)its moons.
C)Pluto.
D)none of the above
Question
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its horizontal component of velocity

A)increases.
B)remains unchanged.
C)decreases.
Question
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of motion

A)decreases.
B)remains constant.
C)increases.
Question
Strictly speaking, when you step off a curb you are momentarily

A)in orbit.
B)weightless.
C)in space.
Question
Throw an object at an angle upward. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 s, it is

A)5 m below the straight line.
B)10 m below the straight line.
C)15 m below the straight line.
Question
Chapter 4 in your textbook cites a link between Newton's Universal Law of Gravity and

A)biological processes.
B)chemical processes.
C)geological processes.
D)the U.S. Constitution.
E)none of the above
Question
A ball is thrown upwards and caught when it returns. Neglecting air resistance, the speed with which it is caught is

A)more than its initial speed.
B)less than its initial speed.
C)the same as its initial speed.
Question
A bullet fired from a rifle begins to fall

A)as soon as it leaves the barrel.
B)after air friction reduces its speed.
C)neither
Question
The Sun is spherical due to

A)Earth circling it.
B)Earth and Moon circling it.
C)gravitation.
D)none of the above
Question
A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

A)5 m.
B)10 m.
C)15 m.
Question
Perturbations of planets are due to

A)interplanetary forces.
B)deviations from straight-line paths.
C)uneven masses of planets.
D)none of the above
Question
If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is

A)1 s.
B)2 s.
C)10 s.
D)not enough information
Question
A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed?

A)5 m/s
B)10 m/s
C)20 m/s
D)25 m/s
E)none of the above
Question
Ignoring air drag, what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court, which is 12.0 m distant?

A)12.0 m/s
B)16.0 m/s
C)24.0 m/s
D)48.0 m/s
Question
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is

A)greater than when it was a the top of its path.
B)less than when it was at the top of its path.
C)the same as it was at the top of its path.
Question
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 s later?

A)50 m
B)98 m
C)100 m
D)500 m
E)none of the above
Question
Toss a rock at an angle into the air and it follows a curved path. Its velocity at any instant can be resolved into horizontal and vertical components. Which of these components changes with time, and why?
Question
A bullet fired horizontally hits the ground in 0.5 s. If it had been fired with twice the velocity it would have hit the ground in

A)less than 0.5 s.
B)more than 0.5 s.
C)0.5 s.
Question
Two motorcycle stunt drivers, one light and the other much heavier, drive their motorcycles up and off an inclined ramp at identical speeds. They both rise in the air and land downrange. Neglecting air drag, the one to attain the greatest height and greatest range is the

A)light driver.
B)heavy driver.
C)both the same
Question
A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same downrange distance?

A)30°
B)45°
C)50°
D)75°
E)90°
Question
A projectile is thrown into the air at an angle of 50° and lands on a target that is at the same level the projectile started. With no air resistance it will also land on the target if it is thrown at an angle of

A)40°.
B)45°.
C)55°.
D)60°.
E)none of the above
Question
Tangential velocity is velocity

A)parallel to the surface of the Earth.
B)perpendicular to the surface of the Earth.
C)attributed to satellites moving in any direction.
Question
A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

A)the dropped one
B)the fired one
C)both hit at the same time
Question
A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

A)the dropped one
B)the fired one
C)both hit at the same time
Question
An airplane flies at 40 m/s at an altitude of 50 m. The pilot drops a heavy package, which falls and strikes the ground. Neglecting air resistance, where does the package land?

A)beneath the plane
B)400 m behind the plane
C)500 m behind the plane
D)more than 500 m behind the plane
E)none of the above
Question
An Earth satellite is simply a projectile freely falling around the Earth.

A)true
B)false
C)sometimes true and sometimes false
Question
Planets would crash into the Sun if it weren't for

A)their tangential velocities.
B)their vast distances from the Sun.
C)the inverse-square law.
D)their relatively small masses.
E)the fact that they are beyond the main gravitation of the Sun.
Question
Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. With no air resistance, the projectile to hit the ground first will be the one fired at

A)30°.
B)60°.
C)both hit at the same time
Question
The hang time of an athlete who moves horizontally 2.0 m during a 1.25-m-high jump is

A)less than 1 s.
B)1 s.
C)more than 1 s.
Question
Shoot a cannonball horizontally from a cannon at the top of a mountain and it gains speed as it falls and hits the ground below. But fire the cannonball fast enough for circular orbit and no change in speed occurs. Why?
Question
A ball is thrown horizontally from the top of a tall cliff. Three seconds later, the ball has fallen a vertical distance of

A)20 m.
B)30 m.
C)45 m.
D)depends on the initial horizontal speed of the ball
Question
For the astronauts inside an orbiting space vehicle, there is no force of Earth's gravity acting on them. This statement is

A)always true while in orbit.
B)sometimes true while in orbit.
C)always false.
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Deck 4: Gravity, Projectiles, and Satellites
1
What is the magnitude and direction of the gravitational force that acts on a person who weighs 500 N at the Earth's surface?
500 N straight downward, which is the weight of the person.
2
If the masses of two planets doubles and the distance between them also doubles, the force between them would be

A)one-quarter.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
E
3
Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

A)increases.
B)decreases.
C)remains constant.
A
4
Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them doesn't change, then the force between them is

A)one-quarter.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
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5
If your mass remains unchanged while both the mass of Earth and its radius doubles, your weight

A)remains the same.
B)doubles.
C)quadruples.
D)increases by eight times.
E)reduces by half.
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6
Two objects move toward each other due to gravity. As the objects get closer and closer, the acceleration of each

A)increases.
B)decreases.
C)remains constant.
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7
If your mass remained the same while the mass of Earth doubled while staying the same size, your weight would

A)be the same.
B)double.
C)quadruple.
D)be eight times as much as now.
E)none of the above
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8
According to Newton, the closer gravitationally interacting objects are to each other, the

A)less the gravitational force between them.
B)more the gravitational force between them.
C)constancy of the force between them.
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9
According to Newton, the greater the masses of interacting objects, the

A)less the gravitational force between them.
B)greater the gravitational force between them.
C)greater the force between them by the square of the masses.
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10
According to Newton, the greater the distance between gravitationally interacting objects, the

A)less the gravitational force between them.
B)more the gravitational force between them.
C)constancy of the force between them.
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11
If the Earth had twice its present radius and twice its present mass, what would happen to your weight? Explain.
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12
If the mass of Earth somehow increased with no change in radius, your weight would

A)increase also.
B)decrease.
C)remain the same.
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13
Newton discovered

A)gravity.
B)that gravity is universal.
C)neither
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14
If Earth's mass doubled with no change in radius, your weight would

A)increase by one-quarter.
B)double.
C)be four times as much.
D)none of the above
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15
Consider two planets in space that gravitationally attract each other. If the mass of one planet is doubled, and the distance between them doesn't change, then the force between them is

A)one-quarter.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
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16
How is stepping off a curb similar to taking a ride aboard the space shuttle?
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17
If the masses of two planets doubles and the distance between reduces by half, the force between them would be

A)unchanged.
B)half as much.
C)twice as much.
D)four times as much.
E)none of the above
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18
The Earth and the Moon gravitationally attract each other. Does the more massive Earth attract the Moon with a greater force, the same force, or less force than the Moon attracts the Earth? What reasoning guides your answer?
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19
What is the force of gravity on a 500-N woman standing on Earth's surface?

A)50 N
B)250 N
C)500 N
D)598 N
E)5000 N
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20
If Earth's mass decreased to one-half its original mass with no change in radius, your weight would

A)decrease to one-quarter.
B)decrease to one-half.
C)remain the same.
D)none of the above
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21
A supplier wants to make a profit by buying gold by weight at one altitude and selling it at the same price per kilogram at another altitude. The supplier should

A)buy at a high altitude and sell at a low altitude.
B)buy at a low altitude and sell at a high altitude.
C)disregard altitude because it makes no difference.
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22
Passengers in a high-flying jumbo jet feel their normal weight in flight. Passengers in an orbiting space vehicle do not because passengers are

A)beyond the main pull of Earth's gravity.
B)above the Earth's atmosphere.
C)without support forces.
D)all the above
E)none of the above
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23
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground. Such twice-as-high apples of the same mass, have

A)1/4 the weight.
B)1/2 the weight.
C)practically the same weight.
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24
If the radius of the Earth somehow decreased with no change in mass, your weight would

A)increase.
B)not change.
C)decrease.
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25
An object is placed exactly halfway between the Earth and the Moon. The object will fall toward the

A)Earth.
B)Moon.
C)neither
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26
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same. This point is

A)nearer Earth.
B)nearer the Moon.
C)mid-way between Earth and the Moon.
D)none of the above
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27
When the distance between two stars doubles, the force between them

A)decreases by one-quarter.
B)decreases by one-half.
C)increases to twice as much.
D)increases to four times as much.
E)remains the same.
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28
If the Sun were twice as massive,

A)its pull on the Earth would double.
B)Earth's pull on the Sun would double.
C)both
D)neither
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29
Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper because the

A)gravitational force is shielded inside the building.
B)mass of the building attracts us upward slightly.
C)both
D)none of the above
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Unlock Deck
k this deck
30
A woman who normally weighs 400 N stands on top of a very tall ladder so she is one Earth-radius above Earth's surface. What is her weigh there?

A)zero
B)100 N
C)200 N
D)400 N
E)none of the above
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31
In the vacuum of outer space, there is no

A)gravity.
B)atmospheric pressure.
C)both
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32
The amount of gravitational force that acts on a space vehicle that orbits Earth is

A)nearly zero.
B)nearly as much as the vehicle's weight on Earth's surface.
C)the same as the vehicle's weight on the Earth's surface.
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33
How far must one travel to completely be beyond Earth's gravity?

A)to a region above the Earth's atmosphere
B)to a region well beyond the Moon
C)to a region beyond the solar system
D)forget it; you can't travel far enough
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34
Inside a freely falling elevator you would experience no

A)gravitational force.
B)weight.
C)both
D)none of the above
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35
Inside a freely falling elevator your

A)acceleration is zero.
B)weight is zero.
C)gravitational interaction with Earth is zero.
D)all the above
E)none of the above
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36
When the distance between two stars decreases by half, the force between them

A)decreases by one-quarter.
B)decreases by one-half.
C)increases to twice as much.
D)increases to four times as much.
E)stays the same.
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Unlock Deck
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37
The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much. This is because

A)your mass is 100 times less on Jupiter.
B)Jupiter is significantly farther from the Sun.
C)Jupiter's radius is 10 times Earth's radius.
D)you are 100 times more weightless there.
E)none of the above
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38
If the radius of the Earth somehow increased with no change in mass, your weight would

A)increase.
B)not change.
C)decrease.
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39
Weight can be simulated in a space vehicle if the vehicle is

A)falling.
B)in a circular orbit about Earth.
C)rotating.
D)none of the above
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40
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?

A)the force on A
B)the force on B
C)both forces are the same
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41
If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the total time to return to its starting position is

A)1 s.
B)2 s.
C)10 s.
D)20 s.
E)not enough information
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42
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity

A)increases.
B)remains unchanged.
C)decreases.
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43
Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it

A)gradually decreases until the ball reaches the top of its path.
B)first acts upward and then downward after reaching the top.
C)s only the force due to gravity, always directed downward.
D)none of the above
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44
A hunter fires a bullet from a horizontally-held rifle while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

A)the dropped one
B)the fired one
C)both hit at the same time
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45
A projectile is launched straight upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is

A)less than 50 m/s.
B)50 m/s.
C)more than 50 m/s.
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46
An object is thrown vertically into the air. Because of air resistance, the time for its descent will be

A)longer than the ascent time.
B)shorter than the ascent time.
C)equal to the ascent time.
D)not enough information
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47
Dwarf planet Pluto was discovered by perturbations of

A)Jupiter.
B)Saturn.
C)Uranus and Neptune.
D)all of the above
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48
A projectile is fired horizontally. With no air resistance it maintains its horizontal component of velocity because

A)no forces act on it.
B)no horizontal forces act on it.
C)of no initial vertical component of velocity.
D)all of the above
E)none of the above
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49
The planet Neptune was discovered by perturbations of

A)Uranus.
B)its moons.
C)Pluto.
D)none of the above
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50
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its horizontal component of velocity

A)increases.
B)remains unchanged.
C)decreases.
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51
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of motion

A)decreases.
B)remains constant.
C)increases.
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52
Strictly speaking, when you step off a curb you are momentarily

A)in orbit.
B)weightless.
C)in space.
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53
Throw an object at an angle upward. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 s, it is

A)5 m below the straight line.
B)10 m below the straight line.
C)15 m below the straight line.
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54
Chapter 4 in your textbook cites a link between Newton's Universal Law of Gravity and

A)biological processes.
B)chemical processes.
C)geological processes.
D)the U.S. Constitution.
E)none of the above
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55
A ball is thrown upwards and caught when it returns. Neglecting air resistance, the speed with which it is caught is

A)more than its initial speed.
B)less than its initial speed.
C)the same as its initial speed.
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56
A bullet fired from a rifle begins to fall

A)as soon as it leaves the barrel.
B)after air friction reduces its speed.
C)neither
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57
The Sun is spherical due to

A)Earth circling it.
B)Earth and Moon circling it.
C)gravitation.
D)none of the above
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58
A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

A)5 m.
B)10 m.
C)15 m.
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59
Perturbations of planets are due to

A)interplanetary forces.
B)deviations from straight-line paths.
C)uneven masses of planets.
D)none of the above
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60
If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is

A)1 s.
B)2 s.
C)10 s.
D)not enough information
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Unlock Deck
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61
A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed?

A)5 m/s
B)10 m/s
C)20 m/s
D)25 m/s
E)none of the above
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62
Ignoring air drag, what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court, which is 12.0 m distant?

A)12.0 m/s
B)16.0 m/s
C)24.0 m/s
D)48.0 m/s
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63
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is

A)greater than when it was a the top of its path.
B)less than when it was at the top of its path.
C)the same as it was at the top of its path.
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64
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 s later?

A)50 m
B)98 m
C)100 m
D)500 m
E)none of the above
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65
Toss a rock at an angle into the air and it follows a curved path. Its velocity at any instant can be resolved into horizontal and vertical components. Which of these components changes with time, and why?
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66
A bullet fired horizontally hits the ground in 0.5 s. If it had been fired with twice the velocity it would have hit the ground in

A)less than 0.5 s.
B)more than 0.5 s.
C)0.5 s.
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67
Two motorcycle stunt drivers, one light and the other much heavier, drive their motorcycles up and off an inclined ramp at identical speeds. They both rise in the air and land downrange. Neglecting air drag, the one to attain the greatest height and greatest range is the

A)light driver.
B)heavy driver.
C)both the same
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68
A projectile is launched at an angle of 15° above the horizontal and lands downrange. With no air resistance, what other projection angle for the same speed would produce the same downrange distance?

A)30°
B)45°
C)50°
D)75°
E)90°
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69
A projectile is thrown into the air at an angle of 50° and lands on a target that is at the same level the projectile started. With no air resistance it will also land on the target if it is thrown at an angle of

A)40°.
B)45°.
C)55°.
D)60°.
E)none of the above
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70
Tangential velocity is velocity

A)parallel to the surface of the Earth.
B)perpendicular to the surface of the Earth.
C)attributed to satellites moving in any direction.
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71
A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

A)the dropped one
B)the fired one
C)both hit at the same time
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Unlock for access to all 114 flashcards in this deck.
Unlock Deck
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72
A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

A)the dropped one
B)the fired one
C)both hit at the same time
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Unlock Deck
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73
An airplane flies at 40 m/s at an altitude of 50 m. The pilot drops a heavy package, which falls and strikes the ground. Neglecting air resistance, where does the package land?

A)beneath the plane
B)400 m behind the plane
C)500 m behind the plane
D)more than 500 m behind the plane
E)none of the above
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74
An Earth satellite is simply a projectile freely falling around the Earth.

A)true
B)false
C)sometimes true and sometimes false
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75
Planets would crash into the Sun if it weren't for

A)their tangential velocities.
B)their vast distances from the Sun.
C)the inverse-square law.
D)their relatively small masses.
E)the fact that they are beyond the main gravitation of the Sun.
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76
Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. With no air resistance, the projectile to hit the ground first will be the one fired at

A)30°.
B)60°.
C)both hit at the same time
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77
The hang time of an athlete who moves horizontally 2.0 m during a 1.25-m-high jump is

A)less than 1 s.
B)1 s.
C)more than 1 s.
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78
Shoot a cannonball horizontally from a cannon at the top of a mountain and it gains speed as it falls and hits the ground below. But fire the cannonball fast enough for circular orbit and no change in speed occurs. Why?
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79
A ball is thrown horizontally from the top of a tall cliff. Three seconds later, the ball has fallen a vertical distance of

A)20 m.
B)30 m.
C)45 m.
D)depends on the initial horizontal speed of the ball
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80
For the astronauts inside an orbiting space vehicle, there is no force of Earth's gravity acting on them. This statement is

A)always true while in orbit.
B)sometimes true while in orbit.
C)always false.
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Unlock Deck
Unlock for access to all 114 flashcards in this deck.