Question 1

A bullet is fired horizontally with an initial velocity of 300 m/s from a 20-m high tower. If air resistance is negligible, the bullet hits downrange about

Accepted Answer

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

Question 2

Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance away. Compared to the time for the ball to simply drop vertically from the bench, the time in the air for Dr. Chuck's projected ball is

Accepted Answer

A) less. 
B) the same. 
C) greater. 
A) less. 
B) the same. 
C) greater.

Question 3

A lunar month is about 28 days. If the Moon were farther from Earth than it is now, the lunar month would be

Accepted Answer

A) less than 28 days. 
B) about 28 days. 
C) more than 28 days. 
D) need more information 
A) less than 28 days. 
B) about 28 days. 
C) more than 28 days. 
D) need more information

Question 4

Angular momentum is greater for a satellite when it is at the

Accepted Answer

A) apogee (farthest point). 
B) perigee (nearest point). 
C) same at apogee and perigee 
A) apogee (farthest point). 
B) perigee (nearest point). 
C) same at apogee and perigee

Question 5

A ball rolled along a horizontal surface maintains a constant speed because

Accepted Answer

A) its velocity remains constant. 
B) no horizontal force acts on it. 
C) of inertia. 
A) its velocity remains constant. 
B) no horizontal force acts on it. 
C) of inertia.

Question 6

Hang time is the time your feet are off the ground in a jump. If you jump upward inside a moving vehicle, your hang time will be

Accepted Answer

A) slightly more. 
B) the same. 
C) slightly less. 
A) slightly more. 
B) the same. 
C) slightly less.

Question 7

A rocket coasts in an elliptical orbit about 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 = ∆ KE guide your thinking.)

Accepted Answer

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

Question 8

Both Newton and Kepler considered forces on the planets. Kepler mistakenly hypothesized the direction of the forces to be

Accepted Answer

A) along their directions of travel. 
B) perpendicular to their directions of travel. 
C) toward the Sun. 
D) none of the above 
A) along their directions of travel. 
B) perpendicular to their directions of travel. 
C) toward the Sun. 
D) none of the above

Question 9

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

Accepted Answer

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

Question 10

To drop a package to Earth from a satellite, project it

Accepted Answer

A) straight downward. 
B) ahead at satellite speed. 
C) behind at satellite speed. 
D) none of the above 
A) straight downward. 
B) ahead at satellite speed. 
C) behind at satellite speed. 
D) none of the above

Question 11

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 5 m above ground level. The ball lands 20 m downrange. The player's pitching speed is about

Accepted Answer

A) 5 m/s. 
B) 10 m/s. 
C) 20 m/s. 
D) 25 m/s. 
E) none of the above 
A) 5 m/s. 
B) 10 m/s. 
C) 20 m/s. 
D) 25 m/s. 
E) none of the above

Question 12

An object is dropped and freely falls to the ground with acceleration g. If it is thrown upward at an angle instead, neglecting air drag, the acceleration along its path will be

Accepted Answer

A) less than g. 
B) the same. 
C) more than g. 
A) less than g. 
B) the same. 
C) more than g.

Question 13

Escape speed from the Moon is

Accepted Answer

A) about the same as from Earth. 
B) much greater than from Earth. 
C) much less than from Earth. 
A) about the same as from Earth. 
B) much greater than from Earth. 
C) much less than from Earth.

Question 14

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

Accepted Answer

A) less than 28 days. 
B) about 28 days. 
C) more than 28 days. 
D) need more information 
A) less than 28 days. 
B) about 28 days. 
C) more than 28 days. 
D) need more information

Question 15

It takes Neptune a longer time to orbit the Sun than Earth does because Neptune

Accepted Answer

A) has much further to go. 
B) goes much slower. 
C) both of these 
D) none of these 
A) has much further to go. 
B) goes much slower. 
C) both of these 
D) none of these

Question 16

Communications and weather satellites always appear at the same place in the sky, because these satellites are

Accepted Answer

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

Question 17

A ball is thrown upward and caught when it returns. Compared with its initial speed and in the presence of air resistance, the speed with which it is caught is

Accepted Answer

A) more. 
B) less. 
C) the same. 
D) need more information. 
A) more. 
B) less. 
C) the same. 
D) need more information.

Question 18

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity

Accepted Answer

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

Question 19

The tangential velocity of an Earth satellite is its velocity

Accepted Answer

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

Question 20

The fastest moving planet in a solar system is the

Accepted Answer

A) smallest planet. 
B) most massive planet. 
C) planet nearest the Sun. 
D) planet farthest from the Sun. 
E) all move at the same speed. 
A) smallest planet. 
B) most massive planet. 
C) planet nearest the Sun. 
D) planet farthest from the Sun. 
E) all move at the same speed.

Exam 10: Projectile and Satellite Motion

A bullet is fired horizontally with an initial velocity of 300 m/s from a 20-m high tower. If air resistance is negligible, the bullet hits downrange about

Dr. Chuck projects a ball horizontally from a lab bench. The ball lands on a bullseye marked on the floor a horizontal distance away. Compared to the time for the ball to simply drop vertically from the bench, the time in the air for Dr. Chuck's projected ball is

A lunar month is about 28 days. If the Moon were farther from Earth than it is now, the lunar month would be

Angular momentum is greater for a satellite when it is at the

A ball rolled along a horizontal surface maintains a constant speed because

Hang time is the time your feet are off the ground in a jump. If you jump upward inside a moving vehicle, your hang time will be

A rocket coasts in an elliptical orbit about 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 = ∆ KE guide your thinking.)

Both Newton and Kepler considered forces on the planets. Kepler mistakenly hypothesized the direction of the forces to be

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

To drop a package to Earth from a satellite, project it

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 5 m above ground level. The ball lands 20 m downrange. The player's pitching speed is about

An object is dropped and freely falls to the ground with acceleration g. If it is thrown upward at an angle instead, neglecting air drag, the acceleration along its path will be

Escape speed from the Moon is

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

It takes Neptune a longer time to orbit the Sun than Earth does because Neptune

Communications and weather satellites always appear at the same place in the sky, because these satellites are

A ball is thrown upward and caught when it returns. Compared with its initial speed and in the presence of air resistance, the speed with which it is caught is

While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity

The tangential velocity of an Earth satellite is its velocity

The fastest moving planet in a solar system is the

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