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Unformatted text preview: to the water. (a) [6pt] What is the speed of the boat after the swimmer pushes off? Let denote the speeds of the swimmer and boat before pushing off, and denote their respective speeds afterward. We are given that and m/s. Using momentum conservation, we find that The boat speed is 0.228 m/s. (b) [6pt] If the push lasts 0.500 s, what is the average force exerted by each on the other? Problem 7. [28pt] Select the appropriate answer for each multiple-choice question. An explanation is not required if your answer is correct, but is required for partial credit in the event of an incorrect answer. (a) [4pt] A helicopter flying to the right at a constant speed drops a package at point A, which hits the ground when the helicopter is at point B. Which trajectory in the figure is correct? (A) (B) (C) (D) (A) (B) (C) (D) (E) (E) The package’s trajectory is parabolic, with an initial horizontal velocity equal to the helicopter’s, so that it is always below the helicopter until it lands below point B. 6 (m) (b) [4pt] The figure shows the position of a particle as it travels along the axis. What is the average velocity of the particle between s 4– and 2– s? (A) 0.25 m/s (B) 0.50 m/s (D)...
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This document was uploaded on 03/09/2014 for the course PHYS 221 at Ohio Northern University.

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