If it is 10:00 A.M. EST in Washington, D.C., what is the time in Denver, Colorado, the longitude of which is 30° more westerly?
a. 12 noon MST
b. 8:00 A.M. MST
c. 10:00 A.M. MST
d. 9:00 A.M. MST
b
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Two masses collide and stick together. Before the collision, one of the masses was at rest. Is there a situation in which the kinetic energy is conserved in such a collision?
a. Yes, if the less massive particle is the one initially at rest. b. Yes, if the more massive particle is the one initially at rest. c. Yes, if the two particles have the same mass. d. No, kinetic energy is always lost is such a collision.
Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Mort observes the pebble's velocity to be
A) 70 m/s north. B) 70 m/s south. C) 40 m/s south. D) 10 m/s south. E) 10 m/s north.
Rainbows exist because light in water drops is
1) reflected. 2) refracted. 3) both of these And the main reason drops disperse different colors involves light's different 4) frequencies. 5) speeds. 6) directions. 7) energies.
Which of these spacecraft did NOT go to Jupiter?
A) Voyager I B) Voyager 2 C) Cassini D) Mariner 9 E) Galileo