Relatively long duration gamma-ray bursts are produced by
A) novae.
B) supernovae.
C) hypernovae.
D) neutron star mergers.
E) black hole mergers.
C
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A simple compound microscope provides large magnification by employing
A) a short focal length objective and a short focal length eyepiece. B) a short focal length objective and a long focal length eyepiece. C) a long focal length objective and a short focal length eyepiece. D) a long focal length objective and a long focal length eyepiece.
An unstable particle initially at rest breaks up into two fragments. The mass of one fragment is 1.75 × 10^–28 kg and the mass of the other fragment is 1.25 × 10^–27 kg. The lighter fragment has a speed of speed 0.850c. What is the speed of the heavier fragment?
a. 0.229c b. 0.119c c. 0.127c d. 0.220c
Movement of air aloft can influence surface air pressure; sometimes air aloft piles up—it converges—causing the surface air pressure to
A) increase and surface winds to blow away from the center of highest pressure. B) decrease and surface winds to blow away from the center of high pressure. C) increase and surface winds to blow away from the center of low pressure. D) decrease and surface winds to blow away from the center of lowest pressure.
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.