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An object moving in a circle at constant speed is accelerated

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Question 2
2.5 out of 2.5 points
A bullet is fired upward. As it rises,

Question 3
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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
2.5 out of 2.5 points
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
2.5 out of 2.5 points
Relative to what she weighs on the earth, an astronaut visiting another planet

Question 6
2.5 out of 2.5 points
A moose weighing 3 kN is standing still. The force the ground exerts on the moose is

Question 7
2.5 out of 2.5 points
A snail travels 45 cm in 20 min. Its average speed is

Question 8
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Which of the following units could be associated with a vector quantity?

Question 9
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Of the following, a molecule is best described as

Question 10
2.5 out of 2.5 points
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
2.5 out of 2.5 points
Which of the following is not true of molecular motion in a gas?

Question 12
2.5 out of 2.5 points
The circulation of hot air in a room is an example of transfer of heat by

Question 13
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When heat is added to a body of matter, the resulting temperature increase does not depend upon

Question 14
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The pressure at the bottom of a barrel filled with liquid does not depend on the

Question 15
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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
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Ice floats in water because

Question 17
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The concept that gravitation is a distortion of space-time is part of

Question 18
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Which of the following quantities is always the same to all observers?

Question 19
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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
2.5 out of 2.5 points
The linear momentum of a 400-kg giraffe galloping at 5 m/s is

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