Question 1

How far must one travel to get away from the Earth's gravitational field?

Accepted Answer

A)  to a region beyond the solar system 
B)  to a region well beyond the moon 
C)  to a region above the Earth's atmosphere 
D)  Forget it; you can't travel far enough. 
A)  to a region beyond the solar system 
B)  to a region well beyond the moon 
C)  to a region above the Earth's atmosphere 
D)  Forget it; you can't travel far enough.

Question 2

A lunar month is about 28 days. If the moon were closer to the Earth than it is now, the lunar month would be

Accepted Answer

A)  unchanged at 28 days. 
B)  more than 28 days. 
C)  less than 28 days. 
A)  unchanged at 28 days. 
B)  more than 28 days. 
C)  less than 28 days.

Question 3

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

Accepted Answer

A)  remains constant. 
B)  decreases. 
C)  increases. 
D)  increases, then decreases. 
E)  decreases, then increases. 
A)  remains constant. 
B)  decreases. 
C)  increases. 
D)  increases, then decreases. 
E)  decreases, then increases.

Question 4

Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to the Earth by virtue of only Earth gravity. It will strike the Earth's surface with a speed of about

Accepted Answer

A)  9.8 m/s. 
B)  11 km/s. 
C)  8 km/s. 
D)  the speed of light. 
A)  9.8 m/s. 
B)  11 km/s. 
C)  8 km/s. 
D)  the speed of light.

Question 5

According to Newton, the greater the masses of interacting objects, the

Accepted Answer

A)  less the gravitational force between them. 
B)  greater the force between them by the square of the masses. 
C)  greater the gravitational force between them. 
A)  less the gravitational force between them. 
B)  greater the force between them by the square of the masses. 
C)  greater the gravitational force between them.

Question 6

The amount of gravitational force that acts on the space shuttle while in orbit is

Accepted Answer

A)  the same as the shuttle's weight on the Earth's surface. 
B)  nearly zero. 
C)  almost as much as the shuttle's weight on the Earth's surface. 
A)  the same as the shuttle's weight on the Earth's surface. 
B)  nearly zero. 
C)  almost as much as the shuttle's weight on the Earth's surface.

Question 7

Earth satellites are typically more than 100 km high so as to be above the Earth's

Accepted Answer

A)  gravitational field. 
B)  atmosphere. 
C)  both of these 
A)  gravitational field. 
B)  atmosphere. 
C)  both of these

Question 8

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

Accepted Answer

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

Question 9

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the top of the cliff is

Accepted Answer

A)  15 m. 
B)  5 m. 
C)  10 m. 
A)  15 m. 
B)  5 m. 
C)  10 m.

Question 10

A projectile is fired vertically from the surface of the Earth at 5 km/s. The projectile will

Accepted Answer

A)  rise and fall back to the Earth's surface. 
B)  go into circular about the Earth. 
C)  go into an elliptical orbit about the Earth. 
D)  none of these 
A)  rise and fall back to the Earth's surface. 
B)  go into circular about the Earth. 
C)  go into an elliptical orbit about the Earth. 
D)  none of these

Question 11

The flight paths of modern space vehicles is based on the work of

Accepted Answer

A)  Fresnel. 
B)  Kepler. 
C)  Faraday. 
D)  Joule. 
E)  Young. 
A)  Fresnel. 
B)  Kepler. 
C)  Faraday. 
D)  Joule. 
E)  Young.

Question 12

Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it is

Accepted Answer

A)  about 10 m below the straight line. 
B)  about 5 m below the straight line. 
C)  about 15 m below the straight line. 
A)  about 10 m below the straight line. 
B)  about 5 m below the straight line. 
C)  about 15 m below the straight line.

Question 13

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in

Accepted Answer

A)  more than 0.5 s. 
B)  0.5 s. 
C)  less than 0.5 s. 
A)  more than 0.5 s. 
B)  0.5 s. 
C)  less than 0.5 s.

Question 14

The force of gravity acting on you will increase if you

Accepted Answer

A)  stand on a planet with a radius that is shrinking. 
B)  burrow deep inside the planet. 
C)  both of these 
D)  none of these 
A)  stand on a planet with a radius that is shrinking. 
B)  burrow deep inside the planet. 
C)  both of these 
D)  none of these

Question 15

A rocket fired vertically at 11.2 km/s will escape the Earth. If it is instead fired horizontally at this speed, free from obstructions, will it still escape the Earth?

Accepted Answer

A)  No 
B)  Yes 
C)  There's no way to tell. 
A)  No 
B)  Yes 
C)  There's no way to tell.

Question 16

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)  you are 100 times more weightless there. 
C)  Jupiter is significantly farther from the sun. 
D)  Jupiter's radius is 10 times the Earth's radius. 
E)  none of these 
A)  your mass is 100 times less on Jupiter. 
B)  you are 100 times more weightless there. 
C)  Jupiter is significantly farther from the sun. 
D)  Jupiter's radius is 10 times the Earth's radius. 
E)  none of these

Question 17

If a satellite's radial velocity is zero at all times, its orbit must be

Accepted Answer

A)  circular. 
B)  parabolic. 
C)  elliptical. 
D)  geosynchronous. 
A)  circular. 
B)  parabolic. 
C)  elliptical. 
D)  geosynchronous.

Question 18

Communications and weather satellites always appear at the same place in the sky. This is because these satellites are

Accepted Answer

A)  stationary in space. 
B)  beyond the pull of the Earth's gravitational field. 
C)  moving at a speed just short of escape velocity. 
D)  orbiting the Earth with a 24-hour period. 
E)  none of these 
A)  stationary in space. 
B)  beyond the pull of the Earth's gravitational field. 
C)  moving at a speed just short of escape velocity. 
D)  orbiting the Earth with a 24-hour period. 
E)  none of these

Question 19

A bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is about

Accepted Answer

A)  500 m. 
B)  400 m. 
C)  600 m. 
D)  300 m. 
E)  200 m. 
A)  500 m. 
B)  400 m. 
C)  600 m. 
D)  300 m. 
E)  200 m.

Question 20

If the sun somehow became twice as massive, your weight as normally measured here on earth would

Accepted Answer

A)  double. 
B)  not change. 
C)  quadruple. 
A)  double. 
B)  not change. 
C)  quadruple.

How far must one travel to get away from the Earth's gravitational field?

A lunar month is about 28 days. If the moon were closer to the Earth than it is now, the lunar month would be

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

Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to the Earth by virtue of only Earth gravity. It will strike the Earth's surface with a speed of about

According to Newton, the greater the masses of interacting objects, the

The amount of gravitational force that acts on the space shuttle while in orbit is

Earth satellites are typically more than 100 km high so as to be above the Earth's

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

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the top of the cliff is

A projectile is fired vertically from the surface of the Earth at 5 km/s. The projectile will

The flight paths of modern space vehicles is based on the work of

Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it is

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in

The force of gravity acting on you will increase if you

A rocket fired vertically at 11.2 km/s will escape the Earth. If it is instead fired horizontally at this speed, free from obstructions, will it still escape the Earth?

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

If a satellite's radial velocity is zero at all times, its orbit must be

Communications and weather satellites always appear at the same place in the sky. This is because these satellites are

A bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is about

If the sun somehow became twice as massive, your weight as normally measured here on earth would

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Exam 6: Gravity, Projectiles, and Satellites

How far must one travel to get away from the Earth's gravitational field?

A lunar month is about 28 days. If the moon were closer to the Earth than it is now, the lunar month would be

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

Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to the Earth by virtue of only Earth gravity. It will strike the Earth's surface with a speed of about

According to Newton, the greater the masses of interacting objects, the

The amount of gravitational force that acts on the space shuttle while in orbit is

Earth satellites are typically more than 100 km high so as to be above the Earth's

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

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the top of the cliff is

A projectile is fired vertically from the surface of the Earth at 5 km/s. The projectile will

The flight paths of modern space vehicles is based on the work of

Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it is

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in

The force of gravity acting on you will increase if you

A rocket fired vertically at 11.2 km/s will escape the Earth. If it is instead fired horizontally at this speed, free from obstructions, will it still escape the Earth?

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

If a satellite's radial velocity is zero at all times, its orbit must be

Communications and weather satellites always appear at the same place in the sky. This is because these satellites are

A bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is about

If the sun somehow became twice as massive, your weight as normally measured here on earth would

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