Magnetic confinement is used in controlled fusion experiments to
a. provide neutrons
b. accelerate nuclei
c. control a plasma
d. excite nuclei into higher energy levels
e. inject energy into nuclei
C
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Galactic collisions ____
a. are very rare, since few galaxies are in clusters b. will cause stars in each galaxy to collide and trigger supernova events c. often trigger bursts of star formation d. only happen in poor clusters e. usually break large galaxy into several small ones
What is the most likely outcome after the collision between two spiral galaxies?
A. the destruction of most of their stars B. formation of a supermassive black hole C. enhanced formation of new stars D. All of these choices are correct.
A coin is 12 cm in front of a converging lens with focal length of magnitude 4.0 cm. Where is the image?
A) 6.0 cm in front of the lens B) 6.0 cm behind the lens C) 8.0 cm behind the lens D) 4.0 cm in front of the lens
A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread. The sphere is given a negative charge before the cover is placed on the bucket. The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket. Which statement is correct?
a. The negative charge remains on the metal sphere. b. The negative charge spreads over the outside surface of the bucket and cover. c. The negative charge spreads over the inside surface of the bucket and cover. d. The negative charge spreads equally over the inside and outside surfaces of the bucket and cover. e. The negative charge spreads equally over the sphere and the inside and outside surfaces of the bucket and cover.