A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate.
b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.
C
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Where, do you feel, is the greatest possible source of error in this experiment? Why?
As I pull a rope connected to a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
a. greater than the tension would be if the box were stationary. b. greater than the weight of the box. c. equal to the weight of the box. d. less than the weight of the box.
The closed universe is compared to the surface of a(n) ________ in spacetime
Fill in the blank(s) with correct word
At least 70% of stars have planets. How many planets can astronomers reasonably claim exist in the Milky Way galaxy?
A) at least 70 billion B) at least 1 trillion C) at least 8 D) at least 3000