An electric current through a tungsten filament maintains its temperature at 2800 K. Assume the tungsten filament behaves as an ideal radiator at that temperature
If the radiating area of the filament is 2.0 × 10-6 m2, at what rate does it radiate energy? (? = 5.670 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.90 × 10-3 m ? K)
A) 11.5 W B) 7.0 W C) 8.5 W D) 5.5 W E) 10 W
B
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What is the probability that an object 100 meters in diameter will hit Earth during the coming year?
A. about 1 in 2 B. about 1 in 10 C. about 1 in 1000 D. about 1 in 100 million E. zero
A ping-pong ball collides with a bowling ball. Which experiences the greatest force?
A. the ping-pong ball B. the bowling ball C. they experience the same force D. the force on each E. the force on each depends on depends on its velocity its mass
Iron meteorites are believed to come from
A) the core of a differentiated asteroid, now broken up. B) the crust of a differentiated asteroid, now broken up. C) interstellar space. D) debris from the Kuiper Belt. E) a broken up cometary nucleus.
A calculus book weighing 20 N rests on the floor of a classroom. The reaction to the force of the floor on the book is a force of
A. 9.8 m/s2 exerted by the Earth on the book. B. 2.04 kg exerted by the floor on the book. C. 20 N exerted by the book on the Earth. D. 0 N. E. 20 N exerted by the book on the floor.