Which of the following is a conservative force? (All refer to a car on a slope.)
a. The force you exert on the car pushing it uphill.
b. The force exerted by rain drops falling on the car.
c. The frictional force of the road on the car.
d. The gravitational force acting on the car.
e. The force you exert on the car (pushing it uphill) after it starts to slide downhill.
D
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A block of wood and a block of copper will feel neither hot nor cold to your touch when they each have
A) equal temperatures. B) your temperature. C) equal conductivities. D) none of the above
Most stars, probably all stars, formed:
A) in a binary system. B) in a triple system. C) in a cluster of stars. D) all by themselves. E) There is no theory to predict this.
A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk
A) acquires a positive charge also. B) remains neutral. C) acquires a negative charge. D) could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.
Identify a true statement about the star clusters in the Milky Way
A) Open clusters are widely scattered throughout the Milky Way. B) Globular clusters are widely scattered throughout the Milky Way. C) Open clusters are more common toward the constellation Sagittarius. D) Globular clusters are more common toward the constellation Aquarius.