Question 1

The Moon does not crash into Earth because

Accepted Answer

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

Question 2

The speed of an Earth satellite does NOT depend on its

Accepted Answer

A) distance from Earth. 
B) mass. 
C) but it depends on both 
D) it depends on neither 
A) distance from Earth. 
B) mass. 
C) but it depends on both 
D) it depends on neither

Question 3

According to Kepler, the paths of planets about the Sun are

Accepted Answer

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

Question 4

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

Accepted Answer

A) nearest Earth. 
B) farthest from Earth. 
C) everywhere along its orbit. 
A) nearest Earth. 
B) farthest from Earth. 
C) everywhere along its orbit.

Question 5

An object is thrown vertically into the air. In this case air resistance affects motion. Compared with its time for ascent, the time for its descent is

Accepted Answer

A) shorter. 
B) the same. 
C) longer. 
D) need more information 
A) shorter. 
B) the same. 
C) longer. 
D) need more information

Question 6

Ideally, a ball is thrown up at an angle and lands downrange. Because of air resistance, the distance reached is

Accepted Answer

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

Question 7

Newton hypothesized that the forces acting on planets was

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 8

Minimal orbit speed about Earth is about 8 km/s, and about Jupiter is

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.

Question 9

A projectile is launched vertically upward at 50 m/s. If air resistance does affect motion, then its speed upon returning to its starting point is

Accepted Answer

A) less than 50 m/s. 
B) 50 m/s. 
C) more than 50 m/s. 
A) less than 50 m/s. 
B) 50 m/s. 
C) more than 50 m/s.

Question 10

Which would require the greater change in a satellite's orbital speed (8 km/s); slowing down so it crashes into Earth, or speeding up so it escapes Earth?

Accepted Answer

A) slowing down 
B) speeding up 
C) same each way 
D) need more information 
A) slowing down 
B) speeding up 
C) same each way 
D) need more information

Question 11

According to Kepler, the speed of a planet is slowest when it is

Accepted Answer

A) closest to the Sun. 
B) farthest from the Sun. 
C) neither, for speed is a constant. 
A) closest to the Sun. 
B) farthest from the Sun. 
C) neither, for speed is a constant.

Question 12

The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely, because

Accepted Answer

A) other forces than Earth's gravity act on it. 
B) it pulls as hard on Earth as Earth pulls on it. 
C) it is beyond the main pull of Earth gravity. 
D) it is kept aloft by ground control. 
E) its orbital period is 24 hours. 
A) other forces than Earth's gravity act on it. 
B) it pulls as hard on Earth as Earth pulls on it. 
C) it is beyond the main pull of Earth gravity. 
D) it is kept aloft by ground control. 
E) its orbital period is 24 hours.

Question 13

Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time?

Accepted Answer

A) the horizontal component 
B) the vertical component 
C) both of these 
D) neither of these 
A) the horizontal component 
B) the vertical component 
C) both of these 
D) neither of these

Question 14

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

Question 15

A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is

Accepted Answer

A) less than 50 m/s. 
B) 50 m/s. 
C) more than 50 m/s. 
A) less than 50 m/s. 
B) 50 m/s. 
C) more than 50 m/s.

Question 16

A satellite coasting at constant speed in a circular orbit

Accepted Answer

A) is beyond the pull of Earth's gravity 
B) is nevertheless accelerating. 
C) undergoes changes in its potential energy. 
D) none of the above 
A) is beyond the pull of Earth's gravity 
B) is nevertheless accelerating. 
C) undergoes changes in its potential energy. 
D) none of the above

Question 17

Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. Neglecting air resistance, the projectile to hit the ground first will be the one fired at

Accepted Answer

A) 30°. 
B) 60°. 
C) both hit at the same time 
A) 30°. 
B) 60°. 
C) both hit at the same time

Question 18

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

Accepted Answer

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

Question 19

A weightless astronaut in an orbiting satellite is

Accepted Answer

A) shielded from Earth's gravitational field. 
B) beyond the pull of gravity. 
C) like the satellite, pulled by Earth's gravitation. 
D) none of the above 
A) shielded from Earth's gravitational field. 
B) beyond the pull of gravity. 
C) like the satellite, pulled by Earth's gravitation. 
D) none of the above

Question 20

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later?

Accepted Answer

A) 50 m 
B) 98 m 
C) 100 m 
D) 490 m 
E) none of the above 
A) 50 m 
B) 98 m 
C) 100 m 
D) 490 m 
E) none of the above

Exam 10: Projectile and Satellite Motion

The Moon does not crash into Earth because

The speed of an Earth satellite does NOT depend on its

According to Kepler, the paths of planets about the Sun are

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

An object is thrown vertically into the air. In this case air resistance affects motion. Compared with its time for ascent, the time for its descent is

Ideally, a ball is thrown up at an angle and lands downrange. Because of air resistance, the distance reached is

Newton hypothesized that the forces acting on planets was

Minimal orbit speed about Earth is about 8 km/s, and about Jupiter is

A projectile is launched vertically upward at 50 m/s. If air resistance does affect motion, then its speed upon returning to its starting point is

Which would require the greater change in a satellite's orbital speed (8 km/s); slowing down so it crashes into Earth, or speeding up so it escapes Earth?

According to Kepler, the speed of a planet is slowest when it is

The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely, because

Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time?

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

A projectile is launched vertically upward at 50 m/s. If air resistance is negligible, its speed upon returning to its starting point is

A satellite coasting at constant speed in a circular orbit

Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. Neglecting air resistance, the projectile to hit the ground first will be the one fired at

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

A weightless astronaut in an orbiting satellite is

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later?

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