Zorch, an archenemy of superman, decides to slow earth’s rotation to once per 29.5 h by exerting a force parallel to the equator, opposing the rotation. he uses an old saturn v rocket, stolen from nasa, which was originally used to send astronauts to the moon. this rocket can exert a thrust of f = 3.8x10^7 n
a) if the original angular velocity of earth is w0 and zorch is trying to get the earth to an angular velocity of we, how much time will it take him? use m and r for the mass and radius of the earth. (b) how long, in seconds, will it take him to do this? (notice that this period gives superman time to devote to thwarting other villains.)

Atennis player used a tennis racket to hit a tennis ball with a mass of 0.25 kg with a force of 5.25 newtons. how does the force the tennis racket exerted on the tennis ball compare with the force the tennis ball exerted on the tennis racket? a. the force of the tennis racket on the tennis ball is equal in magnitude and opposite in direction to the force the tennis ball exerted on the tennis racket. b. the force of the tennis racket on the tennis ball is equal in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. c. the force of the tennis racket on the tennis ball is less in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. d. the force of the tennis racket on the tennis ball is greater in magnitude and opposite in direction as the force the tennis ball exerted on the tennis racket.