An optical SETI signal would most likely consist of
A) using mirrors to reflect light from the surface of a planet
B) using a giant disk to block out the light from the parent star
C) rapid, short bursts of intense laser light
D) a continuous beam of laser light
C
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If two parallel, conducting plates have equal positive charge, the electric field lines will:
a. leave one plate and go straight to the other plate. b. leave both plates and go to infinity. c. enter both plates from infinity. d. none of the above.
Listed following are some of the distinguishing characteristics of the four Galilean moons of Jupiter. Match each characteristic to the appropriate moon.
On the planet Jupiter, a dropped object picks up a speed of 20 m/sec in one second. How fast will it be going at the end of 3 seconds of fall, neglecting "air" resistance on Jupiter?
A) 40 m/sec B) 80 m/sec C) 60 m/sec D) 180 m/sec E) 20 m/sec
Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384,000 km and the mass of the Moon is 7.35 × 10^22 kg