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• Question 1

An object moving in a circle at constant speed is accelerated

• Question 2

A bullet is fired upward. As it rises,

• Question 3

The radius of the path of an object moving in a circle at constant speed is halved. If the speed remains the same, the centripetal force needed is

• Question 4

If the moon were half as far from the earth as it is now, the gravitational force it exerts on the earth would be

• Question 5

Relative to what she weighs on the earth, an astronaut visiting another planet

• Question 6

A moose weighing 3 kN is standing still. The force the ground exerts on the moose is

• Question 7

A snail travels 45 cm in 20 min. Its average speed is

• Question 8

Which of the following units could be associated with a vector quantity?

• Question 9

Of the following, a molecule is best described as

• Question 10

The properties of several different materials are being compared. If the samples all have the same volume, the one with the greatest mass also has the greatest

• Question 11

Which of the following is not true of molecular motion in a gas?

• Question 12

The circulation of hot air in a room is an example of transfer of heat by

• Question 13

When heat is added to a body of matter, the resulting temperature increase does not depend upon

• Question 14

The pressure at the bottom of a barrel filled with liquid does not depend on the

• Question 15

The temperature of a gas sample in a rigid container is reduced. The pressure the gas exerts on the container walls decreases because

• Question 16

Ice floats in water because

• Question 17

The concept that gravitation is a distortion of space-time is part of

• Question 18

Which of the following quantities is always the same to all observers?

• Question 19

The angular momentum of spinning object depends, in part, on its mass and how fast it is spinning. Consider the following situation: a skater spins slowly on one skate, with her arms and the other leg extended. As she pulls in her arms and extended leg, she spins faster. This is because

• Question 20

The linear momentum of a 400-kg giraffe galloping at 5 m/s is

• Question 21

An object that has linear momentum must also have

• Question 22

The watt is a unit of

• Question 23

What never changes when two or more objects collide is

• Question 24

On a molecular level heat is

• Question 25

The current with which a transformer is used

• Question 26

Coulomb's formula F = KQ1Q2/R2 gives the force between two charges in free space. The value of K

• Question 27

Which of the following statements is not true?

• Question 28

A negative electric charge

• Question 29

An object has a positive electric charge whenever

• Question 30

A drawing of the field lines of a magnetic field provides information on

• Question 31

The relationship between voltage, current, and resistance in a metallic wire:

• Question 32

When an observer moves past a stationary electric charge, she detects

• Question 33

When first proposed, a scientific idea is usually called a

• Question 34

The period of the earth's orbit around the sun is

• Question 35

If the earth had no moon,

• Question 36

Stars and planets are round because

• Question 37

The scientist who showed that gravity accounts for Kepler's laws of planetary motion was

• Question 38

What distinguishes the scientific method from other ways of looking at the natural world is

• Question 39

Scientific theories

• Question 40

In which one or more of the following is the earth assumed to be the center of the universe?

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