An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance of
A) 100 m.
B) 150 m.
C) 250 m.
D) 500 m.
E) none of the above
Answer: C
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A light year is a unit of
A) time. B) energy. C) distance. D) mass.
Two metal spheres on insulating stands have the same positive charge Q. If we reduce the distance between the spheres’ centers by a factor of two, the magnitude of the repulsive force between the spheres increases by
A. a bit less than a factor of two. B. exactly a factor of two. C. a bit more than a factor of two. D. a bit less than a factor of four. E. exactly a factor of four. F. a bit more than a factor of four.
Galaxy A receding from Galaxy B at a velocity of 75000 km/s, from the perspective of Galaxy B. Hubble's Law says that V=H0 x D. About how far is Galaxy A from Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A. 50000 Mpc B. 100 Mpc C. 500,000 Mpc D. 5000 Mpc E. 1000 Mpc
In the space shuttle, the areas exposed to the highest temperature are made of
(a) Graphite-fiber-reinforced carbon-carbon composite (b) Silica tiles coated with silicon carbide (c) Graphite-fiber-reinforced epoxy composite (d) Alumina tiles