A radar pulse sent out to an airplane at a distance of 24.9 km will return as an echo to the source in what time interval? (c = 3.00 × 10^8 m/s)
a. 3.33E–5 s
b. 8.30E–5 s
c. 1.66E–4 s
d. 4.15E–5 s
e. 4.98E–4 s
c
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Which statement is true about asteroids? a. All asteroids are found in the asteroid belt between Mars and Jupiter. b. Asteroids are also called dwarf planets
c. Asteroids have an irregular shape and are battered by impact cratering. d. All asteroids have bright, reflective surfaces. e. Asteroids originated from older moons.
Energy Conservation With Conservative Forces: A spring-loaded dart gun is used to shoot a dart straight up into the air, and the dart reaches a maximum height of 24 meters. The same dart is shot up a second time from the same gun, but this time the spring is compressed only half as far (compared to the first shot). How far up does the dart go this time (neglect all friction and assume the spring is ideal)?
A. 6.0 m B. 12 m C. 3.0 m D. 48 m
On Mars, the acceleration due to gravity is 8 m/s/s. If an object is dropped over the surface of Mars, how fast will it be moving at the end of 3 seconds of fall?
A) 32 m/s B) 72 m/s C) 16 m/s D) 24 m/s E) 8 m/s
The elliptical orbit of Mercury measurably precesses because
A) Mercury moves in the gravitational field of the other planets. B) Mercury travels faster than any other planet. C) Mercury is closest to the Sun. D) the Sun's gravitational field varies along Mercury's orbit. E) none of these