Question 1

Without air resistance, a projectile fired horizontally at 8 km/s from a mountaintop will

Accepted Answer

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

Question 2

After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is

Accepted Answer

A) greater than when it was a 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 a 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. C

Question 3

Escape speed for a rocket is less from

Accepted Answer

A) Earth. 
B) the Moon. 
C) the Sun. 
D) same for each 
A) Earth. 
B) the Moon. 
C) the Sun. 
D) same for each B

Question 4

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

Accepted Answer

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

Question 5

Newton discovered

Accepted Answer

A) gravity. 
B) that gravity is universal. 
C) neither 
A) gravity. 
B) that gravity is universal. 
C) neither

Question 6

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) 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 7

From Earth, one satellite appears to overtake another. The faster satellite is

Accepted Answer

A) higher. 
B) lower. 
C) can't say 
A) higher. 
B) lower. 
C) can't say

Question 8

Inside a freely falling elevator you would experience no

Accepted Answer

A) gravitational force. 
B) weight. 
C) both 
D) none of the above 
A) gravitational force. 
B) weight. 
C) both 
D) none of the above

Question 9

If the radius of the Earth somehow decreased with no change in mass, your weight would

Accepted Answer

A) increase. 
B) not change. 
C) decrease. 
A) increase. 
B) not change. 
C) decrease.

Question 10

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 11

A rock is thrown upward at 50° with respect to the horizontal. As it rises, its horizontal component of velocity

Accepted Answer

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

Question 12

Compared to the speed a satellite loses when traveling from nearest to farthest points from Earth, the speed gained when returning from farthest to nearest is

Accepted Answer

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

Question 13

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

Question 14

An airplane flies at 40 m/s at an altitude of 50 m. The pilot drops a heavy package, which falls and strikes the ground. Neglecting air resistance, where does the package land?

Accepted Answer

A) beneath the plane 
B) 400 m behind the plane 
C) 500 m behind the plane 
D) more than 500 m behind the plane 
E) none of the above 
A) beneath the plane 
B) 400 m behind the plane 
C) 500 m behind the plane 
D) more than 500 m behind the plane 
E) none of the above

Question 15

If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is

Accepted Answer

A) 1 s. 
B) 2 s. 
C) 10 s. 
D) not enough information 
A) 1 s. 
B) 2 s. 
C) 10 s. 
D) not enough information

Question 16

A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?

Accepted Answer

A) the force on A 
B) the force on B 
C) both forces are the same 
A) the force on A 
B) the force on B 
C) both forces are the same

Question 17

The circular orbit of a satellite orbiting the Earth is characterized by a constant

Accepted Answer

A) speed. 
B) acceleration. 
C) radial distance. 
D) all the above 
E) none of the above 
A) speed. 
B) acceleration. 
C) radial distance. 
D) all the above 
E) none of the above

Question 18

A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits 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 19

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

Accepted Answer

A) nearest the Earth. 
B) farthest from the Earth. 
C) neither 
A) nearest the Earth. 
B) farthest from the Earth. 
C) neither

Question 20

The Earlybird communication satellite hovers over the same point on Earth's equator indefinitely because

Accepted Answer

A) forces other 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) forces other 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.

Exam 4: Gravity, Projectiles, and Satellites

Without air resistance, a projectile fired horizontally at 8 km/s from a mountaintop will

After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is

Escape speed for a rocket is less from

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

Newton discovered

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

From Earth, one satellite appears to overtake another. The faster satellite is

Inside a freely falling elevator you would experience no

If the radius of the Earth somehow decreased with no change in mass, your weight would

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

A rock is thrown upward at 50° with respect to the horizontal. As it rises, its horizontal component of velocity

Compared to the speed a satellite loses when traveling from nearest to farthest points from Earth, the speed gained when returning from farthest to nearest is

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

An airplane flies at 40 m/s at an altitude of 50 m. The pilot drops a heavy package, which falls and strikes the ground. Neglecting air resistance, where does the package land?

If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is

A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?

The circular orbit of a satellite orbiting the Earth is characterized by a constant

A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

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

The Earlybird communication satellite hovers over the same point on Earth's equator indefinitely because

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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