A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under, although it is now deeper in the water. What happens to the surface level of the pond?
a. It stays the same.
b. It goes up.
c. It goes down.
d. More information is needed to reach a conclusion.
A
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A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring will be
A) the same. B) one-half as much. C) twice as much. D) 3 times as much. E) 4 times as much.
If Earth's axis were tilted at 40°, the seasons of the year would
a. be shorter. b. be harsher. c. be longer. d. not change. e. be milder.
Consider a system consisting of two Einstein solids P and Q in thermal contact. Assume that we know the number of atoms in each solid and ?. What do we know about the system if we also know the total energy in each of the two objects?
A. Its macrostate B. Its microstate C. Its macropartition D. Its microstate and macropartition E. Its macrostate and macropartition F. Its macrostate and microstate T. Its macrostate, microstate, and macropartition
The free-fall contraction of a molecular cloud
a. can be initiated by shock waves from supernovae. b. can be initiated by nearby spectral type G stars. c. can be initiated by the rotation of the cloud. d. causes the cloud to become transparent to ultraviolet radiation. e. causes the particles in the cloud to decrease the speed with which they move.