On a horizontal frictionless air table, a puck runs into an ideal horizontal spring that is fastened to the table. The puck compresses the spring by 15 cm before coming to rest. During the compression process, which quantities are conserved?
A) only the momentum of the puck
B) the momentum and the kinetic energy of the puck
C) only the mechanical energy (kinetic plus potential) of the puck
D) the momentum and the mechanical energy of the puck
E) only the kinetic energy of the puck
Question 2
The textbook shows a graph of the history of U.S. energy use since 1950. According to this graph, which of the following resources presently delivers the most energy or energy equivalent annually to the United States?
A) coal
B) renewable forms such as hydroelectric and solar
C) conservation, considered as equivalent to an energy resource
D) oil
E) nuclear
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