A "standing wave" is a wave that
A) vibrates at zero amplitude.
B) vibrates and moves from one place to another but whose shape does not change.
C) doesn't vibrate.
D) a wave that is in the process of reversing its direction of motion.
E) vibrates but whose "loops" don't move from one place to another.
E
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What are the standard units for luminosity?
A) watts B) joules C) newtons D) kilograms E) watts per second
Suppose that Al the physicist observes a single radioactive nucleus. The length of time until that particular nucleus decays is
A) unpredictable because of the practical difficulties of obtaining all the information needed to make the prediction. B) unpredictable because of fundamental uncertainties arising from quantum physics C) predictable from the known half-life of the nucleus. D) unpredictable because of fundamental uncertainties arising from Newtonian physics. E) predictable, provided Al knows the precise nuclear state of this nucleus.
Show that the heat transfer for a fin that is square and has fin tip convective heat transfer coefficient hL can be written
