The Schwarzschild radius of a black hole depends on
A) only the mass of the black hole.
B) the observationally measured radius of the black hole.
C) the way in which the black hole formed.
D) both the mass and chemical composition of the black hole.
A) only the mass of the black hole.
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When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the denser water of the Dead Sea, the buoyant force that acts on you is
A) greater than your weight. B) less than your weight. C) equal to your weight.
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 Ns. b. 19.6 Ns. c. 29.4 Ns. d. 58.8 Ns. e. 118 Ns.
Briefly explain how Hubble's discovery of a relationship between galactic distance and recession velocity led to the idea of the Big Bang.
What will be an ideal response?
A block is launched up an incline plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3 . The time for the trip up the plane:
a. is the same as the time for the trip down. b. is more than the time for the trip down. c. is less than the time for the trip down. d. cannot be found without knowing the angle of inclination.