Which of the following statements about black holes is not true?
A) If we watch a clock fall toward a black hole, we will see it tick slower and slower as it falls towards the black hole.
B) The event horizon of a black hole represents a boundary from which nothing can escape.
C) If you watch someone else fall into a black hole, you will never see him or her cross the event horizon. However, he or she will fade from view as the light he or she emits becomes more and more redshifted.
D) If you fell into a supermassive black hole (so that you could survive the tidal forces), you would experience time to be running normally as you plunged across the event horizon.
E) If the Sun magically disappeared and was replaced by a black hole of the same mass, the Earth would soon be sucked into the black hole.
E
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When a boxer moves into an oncoming punch, the force experienced is
A) decreased. B) increased. C) no different, but the timing is different. D) all of the above
How do typical wind speeds in Jupiter's atmosphere compare to typical wind speeds on Earth?
A) They are about the same as average winds on Earth. B) They are slightly faster than average winds on Earth. C) They are slightly slower than average winds on Earth. D) They are much faster than hurricane winds on Earth.
Which star shows the least motion in the northern sky over the course of an hour?
What will be an ideal response?
From center outward, which of the following lists the "layers" of the Sun in the correct order?
A) core, convection zone, radiation zone, corona, chromosphere, photosphere B) core, corona, radiation zone, convection zone, photosphere, chromosphere C) core, radiation zone, convection zone, photosphere, chromosphere, corona D) core, radiation zone, convection zone, corona, chromosphere, photosphere