The escape velocity from the Moon is 2.4 km/s. If an astronaut hits a golf ball such that it just reaches this speed, the ball will ________.
A. follow a very elliptical orbit around the Moon
B. continue moving away from the Moon, never to return
C. move away from the Moon, but return some time later
D. either orbit the Moon or escape its gravitational pull, depending on the direction the ball is hit
Answer: B
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Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration
This effect helps us to understand why A) we become more farsighted as we grow older. B) we become more nearsighted as we grow older. C) we can see only in black and white in dim light. D) it is easier to read in bright light than in dim light. E) a moving object is more readily detected than a stationary one.
Planetary transits of exoplanets are rare because
A) most stars are too bright for us to detect a planetary transit. B) the Earth's atmosphere interferes with our observations of transits. C) our telescopes are not powerful enough to detect them. D) most extrasolar systems are not seen edge-on. E) most exoplanets are smaller than Pluto.
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses
A) a vacuum. B) a wooden rod. C) a glass rod. D) an iron rod. E) none of the above
When a fast neutron collides with a hydrogen or deuterium nucleus, the most likely result is that
a. the neutron has an appreciable gain in kinetic energy, the gain being greatest for head-on collisions. b. the neutron has an appreciable gain in kinetic energy, the gain being greatest for oblique collisions. c. the neutron has an appreciable loss in kinetic energy, the loss being greatest for head-on collisions. d. the neutron has an appreciable loss in kinetic energy, the loss being greatest for oblique collisions. e. the neutron is absorbed by the hydrogen or deuterium nucleus.