An isolated black hole will
A. eventually suck in all of the universe.
B. not change in any way.
C. implode due to its own gravity.
D. slowly evaporate away through the emission of Hawking radiation.
Answer: D
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Energy Conservation With Conservative Forces: A person stands on the edge of a cliff. She throws three identical rocks with the same speed. Rock X is thrown vertically upward, rock Y is thrown horizontally, and rock Z is thrown vertically downward. If the ground at the base of the cliff is level, which rock hits the ground with the greatest speed if there is no air resistance?
A. Rock X B. Rock Y C. Rock Z D. They all hit the ground with the same speed.
The force exerted on an electron moving in a magnetic field is maximum when the electron moves
A) parallel to the magnetic field. B) perpendicular to the magnetic field. C) either of these D) neither of these
If the frequency of a violin string is to be increased by 20%, what change in tension must be applied?
A) 44% B) 20% C) 4.5% D) 10%
A line source of strength 2 m2/s is superposed with a velocity of 8 m/s, producing a long, slender body that resembles the one shown. The thickness h of the body is nearest:
(A) 15 cm
(B) 20 cm
(C) 25 cm
(D) 30 cm