How does the density of Jupiter compare to the terrestrial planets?
A) It is denser than all the terrestrial planets combined.
B) It is denser than the Moon, but less dense than any of the others.
C) Its density is slightly less than Mercury, but more than Mars.
D) Its density is about the same as Mars.
E) Its density is less than any terrestrial.
E
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An 8 kg object moving with an initial velocity of 4 m/s comes to rest due to friction after it travels a horizontal distance of 10 m. If the initial speed of the object is doubled, what distance will it travel before coming to rest? Use g = 10 m/s2
A) 10 m B) 20 m C) 30 m D) 40 m E) 80 m
Blocks A and B of masses 18 kg and 19 kg, respectively, are connected by a rope, which passes over a light frictionless pulley, as shown
The horizontal surface is rough. The coefficients of static and kinetic friction are 0.40 and 0.20, respectively. External forces P and Q act on block B, as shown. In Figure 5.20, force P equals 76 N. The force Q for which the block descends at constant speed is closest to: A) 120 N B) 130 N C) 140 N D) 160 N E) 72 N
Which of the following is true of Mars?
A) It is about 95 percent of Earth's diameter. B) It has a thick atmosphere rich in water vapor. C) It is the smallest planet of the Solar System. D) It has a heavily cratered crust marked by volcanoes.
Isotopic analysis of meteorites suggests the Earth and the rest of the solar system formed
A) 3.85 billion years ago B) 4.57 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago