________ provides experimental evidence that the Universe is expanding.
A. Dark matter
B. Hubble's law
C. The Big Bang model
D. The cosmological constant
Answer: B
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A ball, of mass 100. g, is dropped from a height of 12. m. Its momentum when it strikes the ground is
A) 1.5 kg?m/s. B) 4.8 kg?m/s. C) 3.3 kg?m/s. D) 2.4 kg?m/s. E) 1.8 kg?m/s.
Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake. The person in the front throws a very massive ball toward the back, and the person in the back catches it
After the ball is caught, the canoe is A) stationary. B) moving backward. C) moving forward.
A light ray enters a glass enclosed fish tank. From air it enters the glass at 20° with respect to the plane of the surface and then emerges into the water
The index for the glass is 1.50 and for water 1.33. (a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection? If so, find it.
When a superconductor's temperature drops below the critical temperature, its resistance:
a. equals that of a semiconductor of equal dimensions. b. drops to zero. c. reduces to one half. d. increases by two.