Homework #08

# Homework #08 - 1. 9/9 points You throw a ball straight up...

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1. 9/9 points You throw a ball straight up in the air. At the instant the ball reaches its highest location, what is the direction of the momentum of the ball? zero magnitude [ zero magnitude ] At the instant the ball reaches its highest location, what is the direction of the rate of change of momentum of the ball? -y [ -y ] At the instant the ball reaches its highest location, what is the direction of the net force acting on the ball? -y [ -y ] You launch a fan cart to the right along a track, with the fan blowing against the motion. At the instant the cart reaches its farthest location to the right (just before moving back to the left), what is the direction of the momentum of the cart? zero magnitude [ zero magnitude ] At the instant the cart reaches its farthest location to the right, what is the direction of the rate of change of momentum of the cart? -x [ -x ] At the instant the cart reaches its farthest location to the right, what is the direction of the net force acting on the cart? -x [ -x ] A block oscillates up and down at the end of a vertical spring. At the instant the block reaches its lowest position, what is the direction of the momentum of the block? zero magnitude [ zero magnitude ] At the instant the block reaches its lowest position, what is the direction of the rate of change of momentum of the block? +y [ +y ] At the instant the block reaches its lowest position, what is the direction of the net force acting on the block? +y [ +y ] 2. 15/15 points A comet orbits a star in an elliptical orbit, as shown. The momentum of the comet at location A is also shown.

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Use the directions shown to answer the following questions. At location A : What is the direction of the gravitational force exerted on the comet by the star? g [ g ] Is the parallel component of the net force on the comet zero or nonzero? zero [ zero ] Is the perpendicular component of the net force on the comet zero or nonzero? nonzero [ nonzero ] Is , the rate of change of the magnitude of the comet's momentum, positive, negative, or zero? zero [ zero ] Is , the direction of the comet's momentum, changing or not changing? changing [ changing ] At location C : What is the direction of the gravitational force exerted on the comet by the star? e [ e ] Is the parallel component of the net force on the comet zero or nonzero? nonzero [ nonzero ] Iis the perpendicular component of the net force on the comet zero or nonzero? nonzero [ nonzero ] Is , the rate of change of the magnitude of the comet's momentum, positive, negative, or zero? positive [ positive ] Is , the direction of the comet's momentum, changing or not changing? changing
[ changing ] At location F : What is the direction of the gravitational force exerted on the comet by the star? h [ h ] Is the parallel component of the net force on the comet zero or nonzero? nonzero

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## This note was uploaded on 11/02/2009 for the course PHYS 172 taught by Professor ? during the Spring '08 term at Purdue University-West Lafayette.

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Homework #08 - 1. 9/9 points You throw a ball straight up...

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