A calorie is defined to be the amount of heat required to raise the temperature of
a) 1 pound of water by 1 degree Celsius
b) 1 gram of water by 1 degree Celsius
c) 1 gram of water by 1 degree Fahrenheit
d) 1 pound of water by 1 degree Fahrenheit
Answer: b) 1 gram of water by 1 degree Celsius
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The Moon's far side is more ancient and heavily cratered; on Mars, the same is true of its southern hemisphere
Indicate whether the statement is true or false
A "critical mass" is needed for a chain reaction because
A) if the mass is too small the temperature achieved during fission will be too low to sustain the reaction. B) if the mass is too large, the temperature will get too high and the entire mass will blow up without fissioning. C) if the mass is too large, the density will be too high to sustain a chain reaction. D) if the mass is too small, too many neutrons will leak out without causing fission. E) if the mass is too small, there will not be enough uranium to start the reaction.
An external heat source supplies thermal energy through heating to a system at a rate of 187 W as the environment does work on the system at a rate of -131 W. At what rate is the internal (thermal) energy of the system changing?
A) -56 W B) 320 W C) 56 W D) 190 W E) -320 W
A block on a level, frictionless surface and connected to a spring undergoes simple harmonic motion with amplitude A. At x = 0, which relationship is correct?
a. |v| < |vmax| b. |v| = |vmax| c. |v| > |vmax| d. Not enough information to determine a relationship.