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) Graphite-fiber-reinforced carbon-carbon composite (b) Silica tiles coated with silicon carbide (c) Graphite-fiber-reinforced epoxy composite (d) Alumina tiles
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
A light year is a unit of
A) time. B) energy. C) distance. D) mass.