Schwarzschild showed how the _______________ of the event horizon depends only on the mass of the black hole
Fill in the blank(s) with correct word
radius
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A block is supported on a compressed spring, which projects the block straight up in the air at velocity 
. The spring and ledge it sits on then retract. You can win a prize by hitting the block with a ball. When should you throw the ball and in what direction to be sure the ball hits the block? (Assume the ball can reach the block before the block reaches the ground and that the ball is thrown from a height equal to the release position of the block.)
A. At the instant when the block leaves the spring, directed at the block B. At the instant when the block leaves the spring, directed at the spring C. At the instant when the block is at the highest point, directed at the block D. At the instant when the block is at the highest point, directed at the spring E. When the block is back at the spring's original position, directed at that position
If observations had shown that the cosmic microwave background was perfectly smooth (rather than having very slight variations in temperature), then we would have no way to account for ________
A) the fact that our universe is expanding B) how galaxies came to exist C) the relationship between the strong and the weak force D) the existence of helium in the universe
The alpha emission process results in the daughter nucleus differing in what manner from the parent?
a. Atomic mass increases by one. b. Atomic number decreases by two. c. Atomic number increases by one. d. Atomic mass decreases by two.
A hydrogen atom emits a photon of wavelength 657.7 nm. From what energy state to what lower energy state did the electron jump?