Two coherent waves, each with amplitude A, reach the same point in phase. The amplitude of the superposed wave is
A. 0.
B. A.
C. 2 A.
D. 3 A.
E. 4 A.
C. 2 A.
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The theory that the collapse of a massive star's iron core produces neutrinos was supported by
a. the size and structure of the Crab nebula. b. laboratory measurements of the mass of the neutrino. c. the brightening of supernovae a few days after they are first visible. d. underground counts from solar neutrinos. e. the detection of neutrinos from the supernova of 1987.
An object starts with an initial velocity of 4.0 m/s and accelerates with an acceleration of +4.0 
for 6.0 seconds. It then decelerates at -2.0 
until its velocity is 4.0 m/s. The total distance covered is
A. 67 m. B. 94 m. C. 105 m. D. 192 m. E. 215 m.
Al the astronaut has a weight of 800 N when he is standing on the surface of Earth. What is the force of gravity acting on him when he is in a space station orbiting Earth at a distance of three Earth radii above the surface?
A. 800 N B. 200 N C. 100 N D. 50 N
A rock found on Earth that crashed down from space is called ________
A) an impact B) an asteroid C) a meteor D) a meteorite