A simple pendulum has a mass of 0.50 kg and a length of 1.0 m. It is displaced through an angle of 30° and then released. After a time, the maximum angle of swing is only 10°. How much energy has been lost to friction?
a. 2.0 J
c. 0.66 J
b. 1.6 J
d. 0.58 J
D
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For a particle in a 1-dimensional box, what happens to the zero-point energy if the width of the box is halved?
A. nothing, it remains at zero B. it doubles C. it halves D. it quadruples E. it quarters
Two otherwise identical light waves arriving at the same point with peak matching valley undergo
a. constructive interference. b. destructive interference. c. polarization. d. none of the above.
If gold were always sold by weight, could you make money buying gold at one altitude above the ground and selling it at a different altitude?
A) Yes, you could make money by buying gold at a lower altitude and selling it at a higher altitude. B) Yes, you could make money by buying it at either a lower or higher altitude, and then selling it at the other altitude. C) Yes, you could make money by buying gold at a higher altitude and selling it at a lower altitude. D) No, you couldn't make any money this way because the mass of the gold would be the same at both altitudes. E) No, you couldn't make any money this way because the weight of the gold would be the same at both altitudes.
What is the frequency of the most intense radiation from an object with temperature 100°C? The constant in Wien's law is 0.0029 m ? K. (c = 3.0 × 108 m/s)
A) 2.9 × 10-5 Hz B) 3.9 × 1013 Hz C) 1.0 × 1013 Hz D) 1.0 × 1011 Hz