A man pulls a sled at a constant velocity across a horizontal snow surface. If a force of 85 N is being applied to the sled rope at an angle of 56° to the ground, what is the force of friction between sled and snow?
a. 85 N
b. 70 N
c. 48 N
d. 5 N
e. 43 N
c
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Does biological evolution violate the law of entropy, and why or why not?
A) No, because the energy increase of Earth's living organisms is exactly balanced by the energy decrease of the radiation flowing through those organisms. B) No, because the increase in the entropy of the radiation passing through living organisms is greater than the decrease in the entropy of those organisms. C) No, because Earth's organisms actually increase their own entropy during evolution, despite the appearance that they are becoming better organized. D) Yes, because this law is violated in situations involving energy from the sun. E) Yes, because this law is violated when new species are created on Earth.
When a car is braked to a stop, its kinetic energy is transformed into
a. stopping energy b. potential energy c. heat energy d. energy of motion
Comparing the near and far sides of the Moon, we find that the far side ________.
A. has a much lower temperature than the near side B. has as many maria as the near side C. has regolith composed mostly of basalt D. is more heavily cratered than the near side E. All of these choices are correct.
What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas
b. the rapid inward flow of the gas
c. the high temperature of the gas
d. the high density of the gas
e. the high temperature and the high density of the gas