Which is closest to the average distance between asteroids in the asteroid belt?
A) 1 thousand km
B) 10 thousand km
C) 100 thousand km
D) 1 million km
E) 10 million km
D
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Which of the following frames would be an appropriate inertial reference frame for analyzing the effects on the earth of its gravitational interaction with the moon? In each case, answer A if the frame is appropriate, or B if it would be bad for this purpose. Except for the first case, assume the frames are nonrotating.
(a) A frame attached to the earth’s surface (b) A frame attached to the earth’s center of mass (CM) (c) A frame attached to the earth–moon system’s CM (d) A frame attached to the sun’s CM (e) A frame attached to the entire solar system’s CM
Briefly explain why NASA chose Gale Crater as target site of exploration for Curiosity
What will be an ideal response?
Two children seat themselves on a seesaw. The one on the left has a weight of 300 N while the one on the right weighs 200 N. The fulcrum is at the midpoint of the seesaw. If the child on the right is not at the end but is 1.50 m from the fulcrum and the seesaw is balanced, what is the torque provided by the weight of the child on the left? (Take ccw as positive.)
a. –300 N·m b. 300 N·m c. 450 N·m d. –450 N·m e. 150 N·m
About how many galaxies are there in the observable universe?
A) roughly (within about a factor of 10) the same as the number of stars in our galaxy B) a few dozen C) a few thousand D) about as many as the number of grains of sand on all the beaches on Earth E) an infinite number