If the area of the plates of a parallel plate capacitor is tripled and the plate separation is halved, by what factor does the capacitance change?
A. it triples
B. it doubles
C. it increases by a factor of 6
D. it increases 1.5 times
E. it decreases to 2/3 the original
C. it increases by a factor of 6
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Fred carried a 100 N basket to his apartment the fifteenth floor of his building by climbing the stairs
June used a pulley hung from a fifteenth floor window that amplified her force by a factor of 3 to raise a different 100 N basket up to the apartment. Fred claims he'd done more work. June disagreed and says she'd put out more power. Is either person correct? Explain.
When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference?
a. one-fourth of a wavelength c. one wavelength b. half a wavelength d. one and a half wavelengths
A heat pump has a coefficient of performance of 4 . If the heat pump absorbs 20 cal of heat from the cold outdoors in each cycle, the heat expelled (in cal) to the warm indoors is
a. 34 b. 27 c. 36 d. 40 e. 80
The triple-alpha process involves the fusion of
a. three alpha particles. b. three neutral helium atoms. c. three alpha particles or three neutral helium atoms. d. None of the other choices are correct.