According to Newton, the greater the distance between gravitationally interacting objects, the
A) less the gravitational force between them.
B) more the gravitational force between them.
C) constancy of the force between them.
Answer: A
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A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s
A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz
The net force on an object is
A) most often its weight. B) the combination of all forces acting on it. C) the force of friction acting on it.
A solid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25.0° with the horizontal. What is the speed of the disk after it has rolled 3.00 m, measured along the plane?
A) 2.04 m/s B) 3.53 m/s C) 4.07 m/s D) 5.71 m/s E) 6.29 m/s
The idea that everything is made of small particles is
A) a useful idea that is known for certain to be true. B) still only a tentative speculation made by many scientists. C) a useful theory, but not known for certain. D) false and no longer used by scientists. E) not yet widely accepted.