When ice crystals form in clouds, the surrounding air
A) warms.
B) cools.
C) neither of these
Answer: A
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What was the "best" dark matter percentage?
A.) 40%. B.) 50%. C.) 60%. D.) 70%. E.) 80%.
In an adiabatic process:
A. the energy absorbed as heat equals the work done by the system on its environment B. the energy absorbed as heat equals the work done by the environment on the system C. the absorbed as heat equals the change in internal energy D. the work done by the environment on the system equals the change in internal energy E. the work done by the system on its environment equals to the change in internal energy
The temperature of a sample of a substance is a way to gauge
A. the kinetic energy of the fastest moving molecule in the sample. B. the average momentum of the fastest 50% of the molecules in the sample. C. the average kinetic energy of the molecules in that sample. D. the average momentum of the molecules in a sample.
Two experiments are performed. In (A), an 18.0-N force pushes horizontally on a 2.00-kg block that then pushes on a 4.00-kg block. In (B), an 18.0-N force pushes on a 4.00-kg block that then pushes on a 2.00-kg block. Which statement is correct?
A. The acceleration is 3.00 m/s2 in both (A) and (B). B. The acceleration is 4.50 m/s2 in both (A) and (B). C. The acceleration is 6.00 m/s2 in both (A) and (B). D. The acceleration is 9.00 m/s2 in both (A) and (B). E. The 2.00-kg block has a 9.00 m/s2 acceleration. The 4.00-kg block has a 4.50 m/s2 acceleration.