A hunter points a rifle horizontally and holds it 3.30 m above the ground. The bullet leaves the barrel at 325 m/s. Ignore air and assume that free-fall acceleration is 9.80 m/s2
(a) How long does it take for the bullet to strike the ground? (b) How far horizontally does it travel?
(a) 0.821 s (b) 267 m
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An atom that absorbs a certain amount of energy can then emit
A) only a photon of that energy. B) a photon of any energy. C) a photon of the same or higher energy. D) a photon of the same or lower energy.
A fundamental physical reason for the bicycle's high efficiency as a transportation device is
A) it is a wheeled vehicle. B) it is not a heat engine. C) Both of the above. D) it is a heat engine, but one that does not burn fossil fuels. E) Nonsense, trains and airplanes are actually more efficient than bicycles.
Synchrotron radiation is produced by
a. objects with temperature below 10,000 K. b. high-velocity electrons moving through a magnetic field. c. cold hydrogen atoms in space. d. the collapsing cores of massive stars. e. helium flash.
A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (?Al = 2.82 × 10^?8 ? / m; ?Al = 3.9 × 10^?3 / °C; ?nichrome = 1.50 × 10^?6 ? / m; ?nichrome = 0.40 × 10^?3 / °C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire is
a. 0.019. b. 0.10. c. 0.18. d. 9.8. e. 53.