The kinetic energy of an object:
a. is inversely proportional to its speed.
b. is directly proportional to its speed.
c. sometimes increases with increasing speed and sometimes decreases.
d. is directly proportional to the square of its speed.
e. is inversely proportional to the square of its speed.
d
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Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.6 × 10^-6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 × 10^10 decays/s)
a. 4 × 10^10 c. 7 × 10^8 b. 2 × 10^8 d. 1 × 10^13
The angular size of the Moon in the sky is about
a. 1/2 degree. b. 5 degrees. c. 10 degrees. d. 1.6 kilometers. e. 4000 kilometers (1/4 Earth's diameter).
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80
g, what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?
If you drove day and night without stopping for one year without exceeding the legal highway speed limit in the United States, the maximum number of miles you could drive would be closest to:
a. 8700. b. 300000. c. 500000. d. 1000000. e. 32000000.