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


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Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

Which of the following is the largest of the Jovian planets?

A) Neptune B) Jupiter C) Uranus D) Saturn

Physics & Space Science

Smart Rocks are considered for

A. geologic dating B. ballistic missile defense C. nuclear power D. solar power

Physics & Space Science