A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is
a. 0.5 volts. b. 2 volts.
c. 8 volts. d. none of the above.
c
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What part of the Sun's aging process will disrupt the biosphere and evaporate the oceans of Earth?
a. the fusion of hydrogen in the core b. an increase in luminosity as the core becomes helium-enriched c. the expansion of the outer layers of the Sun as a red giant d. the supernova explosion caused by the collapse of the iron core e. hydrogen detonation on the white dwarf remnant
Friction: A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400, and the coefficient of kinetic friction is 0.300. What is the maximum acceleration that the truck can have if the crate is to stay in place relative to the truck?
A. 3.92 m/s2 B. 7.84 m/s2 C. 8.00 m/s2 D. 78.5 m/s2 E. 196 m/s2
Jim and Mary are carrying Bob on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 80 N. Bob weighs 600 N. Bob's center of gravity is 80 cm from Mary. Jim and Mary are at the ends of the stretcher. The force that Jim is exerting to support the stretcher, with Bob on it, is
A. 280 N. B. 320 N. C. 380 N. D. 400 N. E. 520 N.
In photoelectric emission, the work function is the minimum
A) frequency of light to produce emission. B) energy required to eject an electron from the surface. C) energy an emitted electron possesses. D) none of the above