An electric clothes dryer draws 10 A at 220 V. If the clothes put into the dryer have a mass of 10 kg when wet and 3 kg dry, about how long does it take to dry the clothes? (Assume all heat energy goes into vaporizing water, Lv = 2.26 × 10^6 J/kg)

a. 171 min
b. 120 min
c. 51 min
d. 40 min
e. 5 min

b

Physics & Space Science

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When the position of a simple harmonic oscillator is equal to A/2, where A is the amplitude, the kinetic energy is:

A. (3/4)
B. (1/4)
C. (3/8)
D. (1/8)
E. (1/2)

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A simply supported beam is loaded as shown in the figure. The bending moment at point C is approximately:


(A) 5.7 kN?m
(B) 6.1 kN?m
(C) 6.8 kN?m
(D) 9.7 kN?m

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What is the bremsstrahlung process?

A. The emission of a photon from an electron being accelerated by a nucleus B. The emission of an electron from a metal when light is shined on it C. Thermal excitation of photons in a substance D. The emission of an electron from an inner electron shell and the resulting photon when an electron drops from an outer shell to take its place E. Converting power-producing nuclear material to weapons grade

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Vision Problems: A nearsighted person wears contact lenses having a power of -0.15 diopters. What is the person's uncorrected far point?

A. 1.5 m B. 3.3 m C. 6.0 m D. 6.7 m

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Physics & Space Science