A skier of mass 115 kg travels down a ski trail. Suppose the ski trail is not frictionless. (a) If the top of the trail is a height 180 m above the bottom, find the work done by gravity on the skier. J (b) If the skier has a speed of 36 m/s at the bottom of the hill, what is the work done by friction on the skier? (Assume the skier starts at rest at the top of the hill.) J

A skier of mass 115 kg travels down a ski trail. Suppose the ski trail is not frictionless. (a) If the top of the trail is a height 180 m above the bottom, find the work done by gravity on the skier. J (b) If the skier has a speed of 36 m/s at the bottom of the hill, what is the work done by friction on the skier? (Assume the skier starts at rest at the top of the hill.) J

Name: A skier of mass 115 kg travels down a ski trail. Suppose the ski trai
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Description: A skier of mass 115 kg travels down a ski trail. Suppose the ski trail is not frictionless.(a) If the top of the trail is a height 180 m above the bottom, find the work done by gravity on the skier.[_____] J(b) If the skier has a speed of 36 m/s at

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A 3.25-kg crate starting at rest slides down a rough 7.00-m-long ramp, inclined at 27.5° below the horizontal. The magnitude of the force of friction between the crate and the ramp is 9.00 N. (a) How much work is done on the crate by friction? (b) What is the change in potential energy of the crate in sliding down the ramp? (c) What is the speed of the crate at the bottom of the incline? m/s Need Help? Read It
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A horizontal force of magnitude 48.3 N pushes a block of mass 3.75 kg across a floor where the coefficient of kinetic friction is 0.605. (a) How much work is done by that applied force on the block-floor system when the block slides through a displacement of 3.32 m across the floor? (b) During that displacement, the thermal energy of the block increases by 33.1 J. What is the increase in thermal energy of the floor? (c) What is the increase in the kinetic energy of the block? (a) Number i (b) Number i (c) Number i Units Units Units + +
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Suppose a car travels 108 km at a speed of 20.0 m/s, and uses 1.80 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.3 x 108 J per gallon.) (a) What is the force exerted to keep the car moving at constant speed? N (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s? gallons Additional Materials O Reading
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A skier of mass 107 kg travels down a frictionless ski trail. (a) If the top of the trail is a height 186 m above the bottom, what is the work done by gravity on the skier? J (b) Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts from rest. m/s
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