If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape
Indicate whether the statement is true or false
T
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Which of the following is the largest of the Jovian planets?
A) Neptune B) Jupiter C) Uranus D) Saturn
Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building, and neither one experiences appreciable air resistance. Which statement about their accelerations is correct?
A) The acceleration of A is greater than the acceleration of B. B) The acceleration of B is greater than the acceleration of A. C) The two bricks have exactly the same acceleration. D) Neither brick has any acceleration once it is released.
Two equal masses are raised at constant velocity by ropes that run over pulleys, as shown below. Mass B is raised twice as fast as mass A. The magnitudes of the forces are FA and FB, while the power supplied is respectively PA and PB. Which statement is correct?
?
?
a.
FB = FA; PB = PA.
b.
FB = FA; PB = 2 PA.
c.
FB = 2 FA; PB = PA.
d.
FB = 2 FA; PB = 2 PA.
e.
PA = FA; PB = FB.
Smart Rocks are considered for
A. geologic dating B. ballistic missile defense C. nuclear power D. solar power