Capacitors in Combination: A 4.0-µF capacitor and an 8.0-µF capacitor are connected together. What is the equivalent capacitance of the combination if they are connected (a) in series or (b) in parallel?
What will be an ideal response?
(a) 2.7 µF (b) 12.0 µF
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A heat pump uses 100 J of work to output 150 J of heat at some temperature. What is the coefficient of performance for the heat pump?
A. 1.0 B. 1.5 C. 2.0 D. 2.5 E. 3.0
Simple Harmonic Motion: If your heart is beating at 76.0 beats per minute, what is the frequency of your heart's oscillations in hertz?
A. 4560 Hz B. 1450 Hz C. 3.98 Hz D. 2.54 Hz E. 1.27 Hz
A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?
A) 4 kJ B) 20 kJ C) 22 kJ D) 24 kJ E) 44 kJ
What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is not massive enough to become a star?
A) Nothing; all collapsing gas clouds become black holes. B) the crowding of electrons in the core C) A critical fraction of the gas has been driven further into space. D) the central object becoming hot enough to sustain nuclear fusion in its core