• 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?