A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A) one-fourth as much.
B) one-half as much.
C) twice as much.
D) four times as much.
E) the same.
D
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Which one of the hydrogen atoms below is EMITTING light? The electron jumps from the
a. second energy level to first (most bound). b. third energy level to fourth. c. fourth energy level to fifth. d. second energy level to third. e. first energy level to second.
The lengths of the hour and minute hands of a clock are 4 cm and 6 cm, respectively. If the vectors 
represent the hour and minute hands, respectively, then 
at 5:00 pm is closest to
A. 24 cm2 out of the clock face. B. 24 cm2 into the clock face. C. 21 cm2 out of the clock face. D. 21 cm2 into the clock face. E. 12 cm2 out of the clock face. F. 12 cm2 into the clock face.
What is meant by the microwave observations of the cosmic background radiation revealing the "genetic code" of the universe?
What will be an ideal response?
Which one of the following is responsible for the "one-way" nature of time, i.e., for the distinction between past and future?
A) the law of inertia B) the law of conservation of energy C) the second law of thermodynamics D) the gravitational force E) the electromagnetic force