Black Holes Review

________ is the idea that the laws of mechanics are the same in steadily moving reference frames as they are in resting reference frames.

• Galilean relativity

• Anisotropy

• The Anthropic Principle

• The Copernican Revolution

Suppose you are riding a skateboard at 3 m/s to the right and you throw a ball at 2.5 m/s to the left (relative to you). What is the speed of the ball relative to the ground?

• 0.5 m/s

• 1.0 m/s

• 1.5 m/s

• 2.0 m/s

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All speeds are relative, except for the speed of _________ which is absolute.

• sound

• light

• the Sun

• the Earth

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Represented by the letter c, this is the speed limit of the universe, written out as a number.

• 6.67x10^-11 m³/kgs²

• 3x10⁸ m/s

• 1240 eVnm

• 3.14159...

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On a ______ surface, the shortest distance between two points is a straight line.

• flat

• curved

Who described gravity as a consequence of the curvature of spacetime?

• Newton

• Einstein

What are the four dimensions of spacetime?

• x

• y

• z

• t

A ________ is a region of spacetime from which nothing can escape (not even light).

• black hole

• red dwarf

• supergiant

• magnetar

Which of the following events can result in the formation of a black hole?

• The death of a star like the Sun.

• The collapsing core of a high mass star.

• A white dwarf cooling down over time.

What might happen as you fall into a black hole?

• Spaghettification

• You can't escape

• Your time appears to slow down (outside perspective)

• Your light becomes redshifted (outside perspective)

• Your future is now a point in space (the singularity)

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