Vesta's density is:
A) about the same as other asteroids, around 2100-2900 kg/m3.
B) lower than typical asteroids, around 1400 kg/m3.
C) about the same as a typical comet, around 100 kg/m3.
D) about the same as the densest meteorites, around 5000 kg/m3.
E) more than the density of other asteroids, but less than the density of a terrestrial planet; around 3500 kg/m3.
E
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A 2,000 kg car traveling at 30.0 mi/h skids to a stop in 60.0 meters. The force of friction during the skid is (1.0 mi/h = 0.447 m/s)
A. 4,500 N. B. 4,200 N. C. 3,750 N. D. 3,000 N. E. 2,400 N.
On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, when did the Sun and Earth form?
A) January B) December C) September D) February
Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole.
B) They always remain above your horizon.
C) They make relatively small circles, traveling clockwise around the north celestial pole.
D) Like all other stars, they rise in the east and set in the west.
E) You cannot see them from the Southern Hemisphere.
A positive charge is fixed at the origin. A negative charge is moved along the x-axis from x = 50 cm to x = 10 cm. The potential energy of the system
A. increases. B. does not change. C. decreases.