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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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.
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.
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.