Two parallel beams of light in air strike the surface of a transparent material and the refracted beam 1 is closer to the normal than beam 2 . Which beam is traveling at higher speed in the material, and which beam has the higher index of refraction in the material?
a. beam 1, beam 1
c. beam 2, beam 2
b. beam 1, beam 2
d. beam 2, beam 1
D
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A system has a heat source supplying heat to an ideal gas at a rate of 187.0 W and the gas is doing work at a rate of 130.9 W. At what rate is the internal (thermal) energy of the gas changing?
A) 56.1 W B) 318 W C) -56.1 W D) 187 W
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W
Although electrons do not normally have precise positions, you can cause an electron to have a (fairly) precise position by
A) measuring its velocity. B) measuring both its position and velocity at an earlier time. C) measuring its position. D) measuring its momentum at an earlier time. E) measuring its wavelength.
In an experiment, a student brings up the rotational speed of a piece of laboratory apparatus to 30.0 rpm
She then allows the apparatus to slow down uniformly on its own, and counts 240 revolutions before the apparatus comes to a stop. The moment of inertia of the apparatus is known to be 0.0850 kg?m2. What is the magnitude of the retarding torque on the apparatus? A) 0.0425 N ? m B) 0.159 N ? m C) 0.0787 N ? m D) 0.000278 N ? m E) 0.0000136 N ? m