A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RC circuit with R = 10.0 ? and C = 300 ?F. The impedance is
a. 4.68 ?.
b. 8.84 ?.
c. 10.0 ?.
d. 13.4 ?.
e. 18.8 ?.
d
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Tests using a thermal probe in a laboratory setting to determine the thermal conductivity of a granular material, earth, as shown in the figure are limited by the diameter of the container. Estimate the minimum diameter of the container of sample, D, for a test run for 3 minutes. Assume the thermal diffusivity is 5 x 10^-6m^2/s.
Which of the following best describes why the Sun emits most of its energy in the form of visible light?
A) Nuclear fusion in the Sun's core produces visible light photons. B) The Sun's gas is on fire like flames from wood or coal, and these flames emit visible light. C) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light. D) The visible light comes from energy level transitions as electrons in the Sun's hydrogen atoms jump between level 1 and level 2.
An ideal gas is allowed to expand adiabatically until its volume increases by 50%. By approximately what factor is the pressure reduced? (g = 5/3.)
a. 1.5 b. 2.0 c. 2.5 d. 3.0 e. 3.5
Which is the law of reflection?
a. The angle of incidence is the complement of the angle of refraction. b. The angle of incidence is one-half the angle of refraction. c. The angle of transmission is equal to the angle of incidence. d. The angle of incidence equals the angle of reflection. e. The angle of incidence is twice the angle of reflection.