Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
a. 4
b. 2
c. 1
d. 3
e. 0 (no beats are produced)
B
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Thin Lenses: An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?
A. -0.54 B. 0.54 C. -0.32 D. -0.22 E. 0.22
The average density of Earth is ________.
A. about 1 g/cm3 B. about 1 cm3/g C. about 5.5 g/cm3 D. about 5.5 cm3/g
Two parallel conducting plates form a capacitor. With a metal cylinder of length half the plate separation inserted between the plates, it is connected to a battery with potential ?V. The cylinder is now removed
HOW MANY of the quantities
C, ?V, Q, E, and U change?
When the first law of thermodynamics, Q = ?U + W, is applied to an ideal gas that is taken through an isochoric process,
A) ?U = 0. B) W = 0. C) Q = 0. D) all of the above E) none of the above