Question 1

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above Earth's surface. How much is her weight there?

Accepted Answer

A)  0
B)  100 N
C)  200 N
D)  400 N
E)  none of the above

Question 2

If Earth's radius somehow increased with no change in mass, your weight would

Accepted Answer

A)  increase also.
B)  decrease.
C)  stay the same.

Question 3

Inside a freely-falling runaway elevator, your

Accepted Answer

A)  acceleration is zero.
B)  weight is zero.
C)  gravitational interaction with Earth is zero.
D)  all of the above
E)  none of the above

Question 4

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force on the spacecraft is directed

Accepted Answer

A)  toward the asteroid.
B)  away from the asteroid.
C)  toward the Sun.

Question 5

When a star collapses to form a black hole, its mass

Accepted Answer

A)  increases.
B)  decreases.
C)  remains the same.

Question 6

To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should

Accepted Answer

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)  it makes no difference.

Question 7

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be

Accepted Answer

A)  zero.
B)  40 N.
C)  120 N.
D)  360 N.
E)  1080 N.

Question 8

You experience weightlessness

Accepted Answer

A)  in the absence of a supporting surface.
B)  momentarily when you step off a chair.
C)  in a freely falling elevator.
D)  all of the above

Question 9

Tidal forces in general are the result of

Accepted Answer

A)  two or more sources of gravitation.
B)  a combination of any kind of forces acting on a body.
C)  unequal forces acting on different parts of a body.
D)  the inverse-square law.
E)  unequal fluid flow.

Question 10

The force of gravity acting on you will increase if you

Accepted Answer

A)  burrow deep inside Earth.
B)  stand on a planet with a shrinking radius.
C)  both of these
D)  neither of these

Question 11

The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then

Accepted Answer

A)  twice.
B)  three times greater.
C)  four times greater.
D)  none of the above

Question 12

The direction of a gravitational field is

Accepted Answer

A)  in the same direction as gravitational attraction.
B)  away from the center of gravity of an object.
C)  opposite to the direction of gravitational attraction.

Question 13

Which of these three produces the greatest tidal effect on you right now?

Accepted Answer

A)  the Moon
B)  the Sun
C)  the Earth

Question 14

The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes

Accepted Answer

A)  half.
B)  three-quarters.
C)  one-fourth.
D)  none of the above

Question 15

During an eclipse of the Sun the high ocean tides on Earth are

Accepted Answer

A)  extra high.
B)  extra low.
C)  not significantly different.

Question 16

Surrounding a magnet is a magnetic field. Surrounding an electron is an electric field. Surrounding Earth is

Accepted Answer

A)  an alteration in space in which mass experiences a force.
B)  a gravitational field.
C)  both of these
D)  neither of these

Question 17

The concept of force is fundamental to

Accepted Answer

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

Question 18

The identities of dark energy and dark matter are

Accepted Answer

A)  unknown at this time.
B)  subjects of intense astronomical interest.
C)  both of these
D)  neither of these

Question 19

The main reason ocean tides exist is that Moon's pull is stronger

Accepted Answer

A)  than the pull of the Sun.
B)  on water closer to it than on water farther away.
C)  on Earth's oceans than on Earth itself.
D)  all of the above

Question 20

If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would

Accepted Answer

A)  be the same.
B)  double.
C)  quadruple.
D)  be eight times as much as now.
E)  none of the above

Exam 9: Gravity

The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes

Correct AnswerverifiedShow Answer

The identities of dark energy and dark matter are

Correct AnswerverifiedShow Answer

The direction of a gravitational field is

Correct AnswerverifiedShow Answer

You experience weightlessness

Correct AnswerverifiedShow Answer

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the force will be

Correct AnswerverifiedShow Answer

The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then

Correct AnswerverifiedShow Answer

If Earth's radius somehow increased with no change in mass, your weight would

Correct AnswerverifiedShow Answer

The main reason ocean tides exist is that Moon's pull is stronger

Correct AnswerverifiedShow Answer

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force on the spacecraft is directed

Correct AnswerverifiedShow Answer

To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should

Correct AnswerverifiedShow Answer

During an eclipse of the Sun the high ocean tides on Earth are

Correct AnswerverifiedShow Answer

Which of these three produces the greatest tidal effect on you right now?

Correct AnswerverifiedShow Answer

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above Earth's surface. How much is her weight there?

Correct AnswerverifiedShow Answer

The force of gravity acting on you will increase if you

Correct AnswerverifiedShow Answer

If your mass, the mass of Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would

Correct AnswerverifiedShow Answer

The concept of force is fundamental to

Correct AnswerverifiedShow Answer

Surrounding a magnet is a magnetic field. Surrounding an electron is an electric field. Surrounding Earth is

Correct AnswerverifiedShow Answer

Inside a freely-falling runaway elevator, your

Correct AnswerverifiedShow Answer

When a star collapses to form a black hole, its mass

Correct AnswerverifiedShow Answer

Tidal forces in general are the result of

Correct AnswerverifiedShow Answer

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