Question 1

The factor most directly responsible for making a black hole invisible is its

Accepted Answer

A)  color. 
B)  mass. 
C)  surface escape velocity. 
D)  size. 
E)  none of these 
A)  color. 
B)  mass. 
C)  surface escape velocity. 
D)  size. 
E)  none of these

Question 2

A woman on the surface of the Earth has a mass of 50 kilograms and a weight of 490 newtons. If the woman were floating freely inside a space habitat far away from Earth, she would have

Accepted Answer

A)  less weight and more mass. 
B)  more weight and less mass. 
C)  less weight and the same mass. 
D)  less weight and less mass. 
E)  none of these 
A)  less weight and more mass. 
B)  more weight and less mass. 
C)  less weight and the same mass. 
D)  less weight and less mass. 
E)  none of these

Question 3

The concept of force is not fundamental to

Accepted Answer

A)  Newton's theory of gravitation. 
B)  Einstein's theory of gravitation. 
C)  both of these 
D)  neither of these 
A)  Newton's theory of gravitation. 
B)  Einstein's theory of gravitation. 
C)  both of these 
D)  neither of these

Question 4

An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be

Accepted Answer

A)  0 g. 
B)  1 g upward. 
C)  1 g downward. 
D)  larger than 1 g. 
E)  none of these 
A)  0 g. 
B)  1 g upward. 
C)  1 g downward. 
D)  larger than 1 g. 
E)  none of these

Question 5

What prevents satellites such as the space shuttle from falling?

Accepted Answer

A)  centrifugal force 
B)  gravity 
C)  the absence of air drag 
D)  centripetal force 
E)  Nothing; they are continually falling as they orbit the Earth. 
A)  centrifugal force 
B)  gravity 
C)  the absence of air drag 
D)  centripetal force 
E)  Nothing; they are continually falling as they orbit the Earth.

Question 6

A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?

Accepted Answer

A)  the force on B 
B)  the force on A 
C)  Both forces are the same. 
A)  the force on B 
B)  the force on A 
C)  Both forces are the same.

Question 7

If the Earth's mass decreased to one-half its original mass with no change in radius, then your weight would

Accepted Answer

A)  decrease to one half your original weight. 
B)  stay the same. 
C)  decrease to one quarter your original weight. 
D)  none of these 
A)  decrease to one half your original weight. 
B)  stay the same. 
C)  decrease to one quarter your original weight. 
D)  none of these

Question 8

The Earth's gravitational field extends

Accepted Answer

A)  only above and beyond the Earth's surface and cancels inside the Earth. 
B)  both inside and outside the Earth and throughout the entire universe. 
C)  neither of these 
A)  only above and beyond the Earth's surface and cancels inside the Earth. 
B)  both inside and outside the Earth and throughout the entire universe. 
C)  neither of these

Question 9

The reason the moon does not crash into the Earth is that the

Accepted Answer

A)  moon has less mass than the Earth. 
B)  Earth's gravitational field is weak at the moon. 
C)  gravitational pull of other planets keeps the moon up. 
D)  moon has a sufficient tangential speed. 
E)  none of these 
A)  moon has less mass than the Earth. 
B)  Earth's gravitational field is weak at the moon. 
C)  gravitational pull of other planets keeps the moon up. 
D)  moon has a sufficient tangential speed. 
E)  none of these

Question 10

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of

Accepted Answer

A)  55 degrees. 
B)  40 degrees. 
C)  45 degrees. 
D)  60 degrees. 
E)  none of these 
A)  55 degrees. 
B)  40 degrees. 
C)  45 degrees. 
D)  60 degrees. 
E)  none of these

Question 11

The tangential velocity of an Earth satellite is its velocity

Accepted Answer

A)  parallel to the surface of the Earth. 
B)  attributed to satellites moving in any direction. 
C)  perpendicular to the surface of the Earth. 
A)  parallel to the surface of the Earth. 
B)  attributed to satellites moving in any direction. 
C)  perpendicular to the surface of the Earth.

Question 12

A rocket coasts in an elliptical orbit about the Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let "Fd
= change in KE" guide your thinking.)

Accepted Answer

A)  perigee, where it is closest and fastest 
B)  apogee, where it is farthest and slowest 
C)  same either location 
A)  perigee, where it is closest and fastest 
B)  apogee, where it is farthest and slowest 
C)  same either location

Question 13

Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one
Fired at (neglect air resistance)

Accepted Answer

A)  30 degrees. 
B)  60 degrees. 
C)  Both hit at the same time. 
A)  30 degrees. 
B)  60 degrees. 
C)  Both hit at the same time.

Question 14

For the astronauts inside the orbiting space shuttle, there is no force of Earth gravity acting on them. This statement is

Accepted Answer

A)  sometimes true while in orbit. 
B)  always true while in orbit. 
C)  always false. 
A)  sometimes true while in orbit. 
B)  always true while in orbit. 
C)  always false.

Question 15

Which would require the greater energy; slowing down of the orbital speed of the Earth so it crashes into the sun, or speeding up the orbital speed of the Earth so it escapes the sun?

Accepted Answer

A)  slowing down 
B)  same each way 
C)  speeding up 
A)  slowing down 
B)  same each way 
C)  speeding up

Question 16

If the sun were twice as massive

Accepted Answer

A)  its pull on the Earth would double. 
B)  the pull of the Earth on the sun would double. 
C)  both of these 
D)  neither of these 
A)  its pull on the Earth would double. 
B)  the pull of the Earth on the sun would double. 
C)  both of these 
D)  neither of these

Question 17

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

Accepted Answer

A)  nearest the Earth. 
B)  farthest from the Earth. 
C)  It travels at constant speed everywhere in orbit. 
A)  nearest the Earth. 
B)  farthest from the Earth. 
C)  It travels at constant speed everywhere in orbit.

Question 18

The circular path of a satellite orbiting the Earth is characterized by a constant

Accepted Answer

A)  radial distance. 
B)  acceleration. 
C)  speed. 
D)  all of these 
E)  none of these 
A)  radial distance. 
B)  acceleration. 
C)  speed. 
D)  all of these 
E)  none of these

Question 19

The Earlybird communication satellite hovers over the same point on Earth's equator indefinitely. This is because

Accepted Answer

A)  forces other than Earth's gravity act on it. 
B)  it is kept aloft by ground control. 
C)  it pulls as hard on the Earth as the earth pulls on it. 
D)  it is beyond the main pull of Earth gravity. 
E)  its orbital period is 24 hours. 
A)  forces other than Earth's gravity act on it. 
B)  it is kept aloft by ground control. 
C)  it pulls as hard on the Earth as the earth pulls on it. 
D)  it is beyond the main pull of Earth gravity. 
E)  its orbital period is 24 hours.

Question 20

Half way to the center of a planet of uniform density, your weight compared to at the surface would be

Accepted Answer

A)  one-quarter. 
B)  one-half. 
C)  three-quarters. 
D)  the same as at the surface. 
E)  zero. 
A)  one-quarter. 
B)  one-half. 
C)  three-quarters. 
D)  the same as at the surface. 
E)  zero.

The factor most directly responsible for making a black hole invisible is its

A woman on the surface of the Earth has a mass of 50 kilograms and a weight of 490 newtons. If the woman were floating freely inside a space habitat far away from Earth, she would have

The concept of force is not fundamental to

An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be

What prevents satellites such as the space shuttle from falling?

A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?

If the Earth's mass decreased to one-half its original mass with no change in radius, then your weight would

The Earth's gravitational field extends

The reason the moon does not crash into the Earth is that the

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of

The tangential velocity of an Earth satellite is its velocity

A rocket coasts in an elliptical orbit about the Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let "Fd = change in KE" guide your thinking.)

Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one Fired at (neglect air resistance)

For the astronauts inside the orbiting space shuttle, there is no force of Earth gravity acting on them. This statement is

Which would require the greater energy; slowing down of the orbital speed of the Earth so it crashes into the sun, or speeding up the orbital speed of the Earth so it escapes the sun?

If the sun were twice as massive

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

The circular path of a satellite orbiting the Earth is characterized by a constant

The Earlybird communication satellite hovers over the same point on Earth's equator indefinitely. This is because

Half way to the center of a planet of uniform density, your weight compared to at the surface would be

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Exam 6: Gravity, Projectiles, and Satellites

The factor most directly responsible for making a black hole invisible is its

A woman on the surface of the Earth has a mass of 50 kilograms and a weight of 490 newtons. If the woman were floating freely inside a space habitat far away from Earth, she would have

The concept of force is not fundamental to

An object is dropped and freely falls to the ground with an acceleration of 1 g. If it is thrown upward at an angle instead, its acceleration will be

What prevents satellites such as the space shuttle from falling?

A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?

If the Earth's mass decreased to one-half its original mass with no change in radius, then your weight would

The Earth's gravitational field extends

The reason the moon does not crash into the Earth is that the

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of

The tangential velocity of an Earth satellite is its velocity

A rocket coasts in an elliptical orbit about the Earth. To attain escape velocity using the least amount of fuel in a brief firing time, should it fire off at the apogee, or at the perigee? (Hint: Let "Fd = change in KE" guide your thinking.)

Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one Fired at (neglect air resistance)

For the astronauts inside the orbiting space shuttle, there is no force of Earth gravity acting on them. This statement is

Which would require the greater energy; slowing down of the orbital speed of the Earth so it crashes into the sun, or speeding up the orbital speed of the Earth so it escapes the sun?

If the sun were twice as massive

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

The circular path of a satellite orbiting the Earth is characterized by a constant

The Earlybird communication satellite hovers over the same point on Earth's equator indefinitely. This is because

Half way to the center of a planet of uniform density, your weight compared to at the surface would be

About Science

Atoms

Equilibrium and Linear Motion

Newtons Laws of Motion

Momentum and Energy

Fluid Mechanics

Temperature, Heat, and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light Waves

Properties of Light

Quantum Theory

The Atomic Nucleus and Radioactivity

Physics of Rotation and Equilibrium

Filters