Capacitors in Combination: Three identical capacitors are connected in parallel to a potential source (battery). If a charge of Q flows into this combination, how much charge does each capacitor carry?

A. 3Q
B. Q
C. Q/3
D. Q/9


Answer: C

Physics & Space Science

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A heat pump uses 100 J of work output heat at some temperature. If the heat pump withdraws 60 J of heat from some lower temperature, then what is the coefficient of performance for the heat pump?

A. 1.6 B. 2.0 C. 2.4 D. 2.8

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Charge +2q is placed at the origin and charge -q is placed at x = 2a. Where can a third positive charge +q be placed so that the force on it is zero?

What will be an ideal response?

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As shown below, a garden room has three walls, a floor, and a roof, but is open to the garden on one side. The wall widths are L and w. The roof height is h. When traveling sound waves enter the room, standing sound waves can be present in the room if the wavelength of the standing waves is

?

?

a.
, where n is a positive integer.

b.

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A piece of iron rests on top of a piece of wood floating in a bathtub. If the iron is removed from the wood, what happens to the water level in the tub?

A) It goes up. B) It goes down. C) It does not change. D) cannot be determined from the information given

Physics & Space Science