A day at the north pole of Uranus lasts:
A) about 7 hours.
B) about 8 hours.
C) about 21 years.
D) about 42 years.
E) about 84 years.
D
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Angular Momentum: A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg ? m2 is rotating freely with an angular speed of 1.0 rad/s. Two people, each of mass 60 kg, are standing right outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed relative to the ground. What is the angular speed of the merry-go-round right after the two people have stepped on?
A. 0.20 rad/s B. 0.40 rad/s C. 0.60 rad/s D. 0.80 rad/s E. 0.67 rad/s
The first living organisms probably resembled
A) single-celled eukaryotes B) multicellular eukaryotes C) single-celled prokaryotes D) multicellular prokaryotes
The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the acceleration due to gravity at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 0.80 m/s2 B) 9.8 m/s2 C) 4.9 m/s2 D) 1.6 m/s2 E) 2.8 × 106 m/s2
The last minerals to crystallize from a cooling magma have the
A) lowest melting point and the highest percentage of silica. B) lowest melting point and the lowest percentage of silica. C) highest melting point and the highest percentage of silica. D) highest melting point and the lowest percentage of silica.