A 3.50-g bullet, traveling at 250 m/s, hits a hinged, light board at right angles, at a distance of 55.0 cm from its hinges, and emerges on the other side of the board with a speed of 150 m/s
The board is initially stationary but is free to rotate about its hinges and has a moment of inertia of 0.275 kg?m2. What is the angular speed of the board after the bullet emerges? A) 0.700 rad/s
B) 3.05 rad/s
C) 6.10 rad/s
D) 0.0212 rad/s
E) 22.6 rad/s
A
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The carbon-nitrogen-oxygen cycle
a. operates at a slightly lower temperature than the proton-proton chain. b. is most efficient in star less massive than the Sun. c. occurs when carbon and oxygen combine to form nitrogen, which produces energy. d. produces the energy responsible for bipolar flows. e. combines four hydrogen nuclei to form one helium nucleus, which produces energy.
Two-Source Interference of Sound: Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest nonzero distance from the wall the person can stand and hear constructive interference? The speed of sound in air is 343 m/s.
A. 0.34 m B. 0.73 m C. 1.2 m D. 1.6 m
When a 125-kg piece of equipment is hung from a steel wire of diameter 6.00 mm, it stretches the wire by 4.00 mm. If instead the wire had a diameter of 3.00 mm, but all else were the same, by what distance would the same equipment stretch the wire?
A) 1.00 mm B) 2.00 mm C) 16.0 mm D) 8.00 mm E) 4.00 mm
When current reverses direction in a wire, the surrounding magnetic field
A) also reverses direction. B) becomes momentarily stronger. C) contracts. D) expands.