Work is done by gravity on a bowling ball that rolls
A) along a horizontal surface.
B) on a sloped surface.
C) both of these
D) none of the above
Answer: B
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An electron is trapped in an infinite square well (a box) of width 6.88 nm
Find the wavelength of photons emitted when the electron drops from the n = 5 state to the n = 1 state in this system. (c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg) A) 6.49 ?m B) 5.45 ?m C) 5.91 ?m D) 7.07 ?m
In our solar system, terrestrial planets are
A) small, made mostly of rock and iron with high densities, and found close to the Sun B) large, made mostly of gases and liquids with low densities, and found far from the Sun C) large, made of pure gases with low densities, and found far from the Sun D) small, made of pure rock with high densities, and found close to the Sun
Force on a Moving Charge: If a calculated quantity has units of 
, that quantity could be
A. an electric field. B. an electric potential. C. ?0. D. a magnetic field. E. a magnetic torque.
A helium balloon rises because of __________ principle
Fill in the blank(s) with correct word