Question 1

Weight can be simulated in a space vehicle if the vehicle is

Accepted Answer

A) falling. 
B) in a circular orbit about Earth. 
C) rotating. 
D) none of the above 
A) falling. 
B) in a circular orbit about Earth. 
C) rotating. 
D) none of the above

Question 2

The force of gravity does work on a satellite when it is in

Accepted Answer

A) circular orbit. 
B) elliptical orbit. 
C) both 
D) neither 
A) circular orbit. 
B) elliptical orbit. 
C) both 
D) neither

Question 3

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

Accepted Answer

A) one-quarter. 
B) half as much. 
C) twice as much. 
D) four times as much. 
E) none of the above 
A) one-quarter. 
B) half as much. 
C) twice as much. 
D) four times as much. 
E) none of the above

Question 4

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

Accepted Answer

A) light driver. 
B) heavy driver. 
C) both the same 
A) light driver. 
B) heavy driver. 
C) both the same

Question 5

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?

Accepted Answer

The force between each is the same, in a

Question 6

The amount of gravitational force that acts on a space vehicle that orbits Earth is

Accepted Answer

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. 
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 7

A ball is thrown upwards and caught when it returns. Neglecting air resistance, the speed with which it is caught is

Accepted Answer

A) more than its initial speed. 
B) less than its initial speed. 
C) the same as its initial speed. 
A) more than its initial speed. 
B) less than its initial speed. 
C) the same as its initial speed.

Question 8

Acceleration is greatest for a satellite in elliptical orbit when it is

Accepted Answer

A) closest to Earth. 
B) farthest from Earth. 
C) same at both places 
A) closest to Earth. 
B) farthest from Earth. 
C) same at both places

Question 9

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

Accepted Answer

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 
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 10

What is the magnitude and direction of the gravitational force that acts on a person who weighs 500 N at the Earth's surface?

Accepted Answer

500 N straight downw

Question 11

If the radius of the Earth somehow increased with no change in mass, your weight would

Accepted Answer

A) increase. 
B) not change. 
C) decrease. 
A) increase. 
B) not change. 
C) decrease.

Question 12

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

Accepted Answer

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

Question 13

The reason the Moon does not crash into Earth is that

Accepted Answer

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

Question 14

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

Accepted Answer

A) decrease to one-quarter. 
B) decrease to one-half. 
C) remain the same. 
D) none of the above 
A) decrease to one-quarter. 
B) decrease to one-half. 
C) remain the same. 
D) none of the above

Question 15

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

Accepted Answer

A) increases. 
B) decreases. 
C) remains constant. 
A) increases. 
B) decreases. 
C) remains constant.

Question 16

Two objects move toward each other due to gravity. As the objects get closer and closer, the acceleration of each

Accepted Answer

A) increases. 
B) decreases. 
C) remains constant. 
A) increases. 
B) decreases. 
C) remains constant.

Question 17

Passengers in a high-flying jumbo jet feel their normal weight in flight. Passengers in an orbiting space vehicle do not because passengers are

Accepted Answer

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 
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 18

The hang time of an athlete who moves horizontally 2.0 m during a 1.25-m-high jump is

Accepted Answer

A) less than 1 s. 
B) 1 s. 
C) more than 1 s. 
A) less than 1 s. 
B) 1 s. 
C) more than 1 s.

Question 19

Escape speed for a rocket is greatest from

Accepted Answer

A) Earth. 
B) the Moon. 
C) the Sun. 
D) same for each 
A) Earth. 
B) the Moon. 
C) the Sun. 
D) same for each

Question 20

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?

Accepted Answer

Only the vertical component changes with

Exam 4: Gravity, Projectiles, and Satellites

Weight can be simulated in a space vehicle if the vehicle is

The force of gravity does work on a satellite when it is in

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

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

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?

The amount of gravitational force that acts on a space vehicle that orbits Earth is

A ball is thrown upwards and caught when it returns. Neglecting air resistance, the speed with which it is caught is

Acceleration is greatest for a satellite in elliptical orbit when it is

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

What is the magnitude and direction of the gravitational force that acts on a person who weighs 500 N at the Earth's surface?

If the radius of the Earth somehow increased with no change in mass, your weight would

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

The reason the Moon does not crash into Earth is that

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

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

Two objects move toward each other due to gravity. As the objects get closer and closer, the acceleration of each

Passengers in a high-flying jumbo jet feel their normal weight in flight. Passengers in an orbiting space vehicle do not because passengers are

The hang time of an athlete who moves horizontally 2.0 m during a 1.25-m-high jump is

Escape speed for a rocket is greatest from

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?

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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