A cart starts with velocity v and rolls up the frictionless path shown. At what point does the cart have the greatest total energy?
A. 1
B. 2
C. 3
D. 4
E. all the same
E. all the same. Since there is no friction, there is conservation of mechanical energy. There is a conversion of kinetic energy to potential energy, but the sum stays the same.
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You push on a block on frictionless ice with a force of 8 N, causing it to accelerate at 2 m/s2 . The mass of the block is
a. 2 kg. b. 4 kg. c. 8 kg. d. 16 kg. e. 6 kg.
The inversion of Marjorie's image in a plane mirror is actually an inversion of
A) left and right. B) up and down. C) front and back. D) all of the above
In a bucket of water, the instantaneous speed of the molecules is closest to
A. zero, since they don't move B. whatever speed the wood is moving C. approximately 1.7 meters per second D. approximately 1000 feet per second E. approximately 186,000 miles per second
The proton-proton chain
a. combines two hydrogen nuclei to produce a single helium nucleus and energy. b. splits a helium nucleus to produce 4 hydrogen nuclei and energy. c. is the mechanism that increases the temperature between the photosphere and corona of the Sun. d. is the interactions between protons in Earth's atmosphere that produces auroras. e. produces energy in the core of the Sun in the form of gamma rays, positrons, and neutrinos.