We say that the Moon is gibbous when
A) it appears to be more than half illuminated, but not full.
B) it appears to be less than half illuminated, but not new.
C) it is exactly half illuminated.
D) we see a thin crescent of light.
E) the Moon is visible in the morning.
A) it appears to be more than half illuminated, but not full.
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A copper pipe is held vertically and a magnet is dropped down the pipe. The magnet is oriented with the north pole down. What direction do the Eddy currents flow as viewed from above the pipe? If copper bar of approximately the same size and weight is dropped down the tube will it fall faster or slower?
A. CCW above the magnet and CW below the magnet; copper bar will fall slower B. CCW above the magnet and CW below the magnet; copper bar will fall faster C. CW above the magnet and CCW below the magnet; copper bar will fall slower D. CW above the magnet and CCW below the magnet; copper bar will fall faster
How could the Universe be accelerating, despite the gravitational pull of all the matter in it?
A.) There's no friction in space. B.) There could be less dark matter than we think. C.) There could be a new force or property of space that affects the Universe on its largest scales. D.) Our laws of nature are incorrect. E.) Probably B and C.
How is quantum tunneling important to our existence here on Earth?
A) It explains how neutron stars are able to stay stable rather than collapsing under their strong gravity. B) It explains why electrons in atoms gradually fill different energy levels, thus making chemistry possible. C) It plays a crucial role in nuclear fusion in the Sun, so that our Sun would not shine brightly without it. D) It is very important to understanding the law of conservation of energy.
The mass of a supermassive black hole thought to power a typical bright active galactic nucleus is roughly ________
A) 1 billion solar masses B) 3 solar masses C) 10 solar masses D) 1 trillion solar masses