How long does it take a wheel that is rotating at 33.3 rpm to speed up to 78.0 rpm if it has an angular acceleration of 2.15 rad/s2?
A) 20.8 s
B) 4.75 s
C) 10.4 s
D) 2.18 s
E) 5.20 s
D
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Compton Scattering: X-rays of wavelength 0.20 nm are scattered by a free electron. The change in the wavelength of the x-rays is observed to be 2.0 × 10-12 m at a certain scattering angle measured relative to the incoming x-ray direction. What is the scattering angle of the x-rays? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 20° B. 40° C. 60° D. 80°
A block of granite is actually mostly empty space because the atoms making up the granite are
A) in perpetual motion. B) made of cotton candy. C) not as close together as they could be. D) held together by electrical forces. E) themselves mostly empty space.
When you leave your warm house for an hour or so on a cold day, to save energy you should turn the thermostat
A) down. B) up. C) off. D) to room temperature.
Galactic redshifts indicate the ________ of the universe.
Fill in the blank(s) with the appropriate word(s).