Work-Energy Theorem: A stone initially moving at 8.0 m/s on a level surface comes to rest due to friction after it travels 11 m. What is the coefficient of kinetic friction between the stone and the surface?
A. 0.13
B. 0.25
C. 0.30
D. 0.43
E. 0.80
Answer: C
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A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block
a. 4.2 N b. 3.0 N c. 3.4 N d. 3.8 N e. 2.3 N
Before about 4 billion years ago the universe was
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
Dark energy is the name of the
a. force that lead to the inflationary period of the Universe. b. five-dimensional space of the Universe. c. force suspected to cause the current acceleration in the rate of expansion of the Universe. d. one of the particles of dark matter related to WIMPs. e. the force that holds the proton together.
The Big Dipper is a(n)
a. cluster of galaxies. b. constellation. c. galaxy. d. asterism.