Which of these are physical quantities?
a. time
b. energy
c. seconds
d. kilometers
e. volume
A, B, E
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Which of the systems listed below is the largest, having NA = NB and U = 6NA? for which there is a better than 1 in a billion chance of seeing one or the other solid having zero energy?
A. NA = 6 B. NA = 8 C. NA = 10 D. NA = 12 E. NA = 15
Most of the visible light we see coming from the Sun originates from the
a. chromosphere. b. photosphere. c. corona. d. sunspots. e. magnetic field.
RMS and Peak Quantities: The current through a 50-? resistor is I = (0.80 A) sin(240t), where t is measured in seconds. How much power on average is dissipated in the resistor?
A. 16 W B. 32 W C. 45 W D. 64 W
If work was done on an object, the object must have
A. experienced a frictional force. B. accelerated. C. changed its position. D. changed only its direction of motion.