Question 1

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

Accepted Answer

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

Question 2

The tangential velocity of an Earth satellite is its velocity

Accepted Answer

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

Question 3

The period of a satellite,the time it takes for a complete revolution,depends on the satellite's

Accepted Answer

A) mass. 
B) weight. 
C) radial distance. 
D) all of these 
E) none of these 
A) mass. 
B) weight. 
C) radial distance. 
D) all of these 
E) none of these C

Question 4

Compared to the period of satellites in orbit close to the Earth,the period of satellites in orbit far from the Earth is

Accepted Answer

A) longer. 
B) shorter. 
C) the same. 
D) not enough information 
A) longer. 
B) shorter. 
C) the same. 
D) not enough information

Question 5

Acceleration is greater for a satellite when it is at the

Accepted Answer

A) apogee. 
B) perigee. 
C) zenith. 
D) same acceleration at all of the above places. 
A) apogee. 
B) perigee. 
C) zenith. 
D) same acceleration at all of the above places.

Question 6

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 7

Pioneer 10 was able to escape the solar system by

Accepted Answer

A) having a sufficient escape velocity at launch. 
B) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket. 
C) refueling via solar cells. 
D) nuclear-powered sustained thrust. 
A) having a sufficient escape velocity at launch. 
B) "bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket. 
C) refueling via solar cells. 
D) nuclear-powered sustained thrust.

Question 8

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle.Which bullet will hit the ground first?

Accepted Answer

A) the dropped one 
B) the fired one 
C) Both hit at the same time. 
A) the dropped one 
B) the fired one 
C) Both hit at the same time.

Question 9

A projectile is fired vertically from the surface of the Earth at 8 km/s.The projectile will

Accepted Answer

A) go into circular orbit about the Earth. 
B) rise and fall back to the Earth's surface. 
C) follow an uncertain path. 
D) escape from the Earth. 
A) go into circular orbit about the Earth. 
B) rise and fall back to the Earth's surface. 
C) follow an uncertain path. 
D) escape from the Earth.

Question 10

Which would require the greater change in the Earth's orbital speed (30 km/s);slowing down so the Earth crashes into the sun,or speeding up so the Earth escapes the sun?

Accepted Answer

A) slowing down 
B) speeding up 
C) same each way 
D) More information about Earth-sun distance is needed. 
A) slowing down 
B) speeding up 
C) same each way 
D) More information about Earth-sun distance is needed.

Question 11

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

Accepted Answer

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

Question 12

After a rock thrown straight up reaches the top of its path and then falls a short distance,its acceleration is (neglect air resistance)

Accepted Answer

A) greater than when it was at the top of its path. 
B) less than when it was at the top of its path. 
C) the same as it was at the top of its path. 
A) greater than when it was at the top of its path. 
B) less than when it was at the top of its path. 
C) the same as it was at the top of its path.

Question 13

Without air resistance,a projectile fired horizontally at 8 km/s from atop a mountain would

Accepted Answer

A) accelerate downward at g as it moves horizontally. 
B) trace a curve that matches the earth's curvature. 
C) return later to its starting position and repeat its falling behavior. 
D) all of these 
E) none of these 
A) accelerate downward at g as it moves horizontally. 
B) trace a curve that matches the earth's curvature. 
C) return later to its starting position and repeat its falling behavior. 
D) all of these 
E) none of these

Question 14

A satellite describes an elliptical orbit about a planet.The satellite travels much faster when it is directly over a

Accepted Answer

A) large ocean. 
B) large island. 
C) high mountain range. 
D) great plain or plateau. 
E) None of the above choices affects its speed very much. 
A) large ocean. 
B) large island. 
C) high mountain range. 
D) great plain or plateau. 
E) None of the above choices affects its speed very much.

Question 15

According to Kepler's laws,the paths of planets about the sun are

Accepted Answer

A) parabolas. 
B) circles. 
C) straight lines. 
D) ellipses. 
E) none of these 
A) parabolas. 
B) circles. 
C) straight lines. 
D) ellipses. 
E) none of these

Question 16

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground.The player sees the ball land 20 m down range.What is the player's pitching speed?

Accepted Answer

A) about 5 m/s 
B) about 10 m/s 
C) about 20 m/s 
D) about 25 m/s 
E) none of these 
A) about 5 m/s 
B) about 10 m/s 
C) about 20 m/s 
D) about 25 m/s 
E) none of these

Question 17

Use the following figure to answer the question :
 
-A rock is thrown upward at 50 degrees with respect to the horizontal.As it 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 18

The radial velocity of an Earth satellite is its velocity

Accepted Answer

A) parallel to the surface of the Earth. 
B) perpendicular to the surface of the Earth. 
C) attributed to satellites moving in any direction. 
D) none of these 
A) parallel to the surface of the Earth. 
B) perpendicular to the surface of the Earth. 
C) attributed to satellites moving in any direction. 
D) none of these

Question 19

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

Question 20

Minimal orbit speed about the Earth is about 8 km/s.Minimal orbital speed about Jupiter would be

Accepted Answer

A) less than 8 km/s. 
B) more than 8 km/s. 
C) about 8 km/s. 
A) less than 8 km/s. 
B) more than 8 km/s. 
C) about 8 km/s.

Exam 10: Projectile and Satellite Motion

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

The tangential velocity of an Earth satellite is its velocity

The period of a satellite,the time it takes for a complete revolution,depends on the satellite's

Compared to the period of satellites in orbit close to the Earth,the period of satellites in orbit far from the Earth is

Acceleration is greater for a satellite when it is at the

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

Pioneer 10 was able to escape the solar system by

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle.Which bullet will hit the ground first?

A projectile is fired vertically from the surface of the Earth at 8 km/s.The projectile will

Which would require the greater change in the Earth's orbital speed (30 km/s);slowing down so the Earth crashes into the sun,or speeding up so the Earth escapes the sun?

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

After a rock thrown straight up reaches the top of its path and then falls a short distance,its acceleration is (neglect air resistance)

Without air resistance,a projectile fired horizontally at 8 km/s from atop a mountain would

A satellite describes an elliptical orbit about a planet.The satellite travels much faster when it is directly over a

According to Kepler's laws,the paths of planets about the sun are

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground.The player sees the ball land 20 m down range.What is the player's pitching speed?

Use the following figure to answer the question : -A rock is thrown upward at 50 degrees with respect to the horizontal.As it rises,neglecting air drag,its vertical component of velocity

The radial velocity of an Earth satellite is its velocity

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

Minimal orbit speed about the Earth is about 8 km/s.Minimal orbital speed about Jupiter would be

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