A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward
Which of the following statements about the bounce are correct? (There could be more than one correct choice.) A) The ball had the same momentum just before and just after the bounce.
B) The magnitude of the ball's momentum was the same just before and just after the bounce.
C) The ball's momentum was conserved during the bounce.
D) None of the above statements are correct.
B
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In 1924, Edwin Hubble proved that the Andromeda Galaxy lay far beyond the bounds of the Milky Way, thereby putting to rest the idea that it might have been a cloud within our own galaxy. What key observation enabled him to prove this?
A) He observed individual Cepheid variable stars in Andromeda. B) He was able to measure the parallax of the Andromeda Galaxy. C) He found that the universe is expanding, and therefore concluded that Andromeda must lie outside our own galaxy. D) He was the first person ever to look through a telescope at the object we now call the Andromeda Galaxy.
One unusual aspect of dark matter is
A) it exerts no gravitational force. B) it moves faster than lightspeed. C) it exerts a new kind of fundamental force, never observed before. D) it does not interact with electromagnetic radiation. E) its gravitational force pushes (or repels) instead of pulling.
Heat Engines: A heat engine absorbs 85.6 kJ of heat each cycle and exhausts 61.8 kJ.(a) What is the efficiency of the engine?(b) How much work does it do each cycle?
What will be an ideal response?
_________ are electromagnetic radiation with wavelengths typically from 0.1 nm to 1 nm.
Fill in the blank(s) with the appropriate word(s).