Calculating WorkThe equation for work is shown below. Force is the forceapplied to the object. Distance is the distance the objectmoves in the direction of the force while the force is actingMath SkillsA student lifts a bag from thefloor to his or her shoulder1.2 m above the floor, usingon it.a force of 50 N. How muchWork Equationwork does the student do onwork (in joules) = force (in newtons) x distance (in meters)the bag?W = Fda. This is what you know:force:F = 50 NThe force in the equation is in newtons (N), and distanceis in meters (m). The product of newtons and meters isdistance: d = 1.2 mnewton-meter (N-m). A newton-meter is a joule (J).b. You need to find:work: WEnergy and HeatHave you ever heard the phrase burning rubber? The tiresc. Use this formula:W = Fdd. Substitute the values forF and d into the formulaand multiply:of race cars are made of rubber. The tires and the road are incontact, and they move past each other quickly. Recall thatfriction is a force between two surfaces in contact with eachother. The direction of friction is in the opposite direction ofW = (50 N) × (1.2 m)the motion.= 60 N-m = 60 JFriction between a car's tires and the road causes some ofAnswer: The amount of workthe kinetic energy of the tires to transform into thermalenergy. If race cars are moving very quickly, thermal energyin the tires causes the rubber to give off a burnt odor.done is 60 J.6. Solve for WorkA student pulls out his or herchair in order to sit down.As a race car moves, energy is transformed and transferred.For example, a car's engine transforms energy from fuel andtransfers it to the wheel axle. In every energy transformationand every energy transfer, some energy is transformed intothermal energy. This thermal energy is transferred to thesurroundings. Thermal energy moving from a region ofhigher temperature to a region of lower temperature is calledheat. Scientists sometimes call this heat waste energy becauseThe student pulls the chair0.75 m with a force of 20 N.How much work does he orshe do on the chair?it is not easily used to do useful work.ision of The McGraw-Hill Companies, Inc.

Name: Calculating WorkThe equation for work is shown below. Force is the fo
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Description: Calculating WorkThe equation for work is shown below. Force is the forceapplied to the object. Distance is the distance the objectmoves in the direction of the force while the force is actingMath SkillsA student lifts a bag from thefloor to his or h

Given data: Force (F) = 20 N Displacement (d) = 0.75 m Required: Work (W)

Answered: A student pulls out his or her chair in…

Science

Physics

A student pulls out his or her chair in order to sit down. The student pulls the chair 0.75 m with a force of 20 N. How much work does he or she do on the chair?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter8: Potential Energy And Conservation Of Energy

Section: Chapter Questions

Problem 30P: A crate on rollers is being pushed without frictional loss of energy across the floor of a freight...

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(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 9. When climbing a flight of stairs, do you do work on the stairs? Do the stairs do work on you?
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(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) If we know that a force of 5 N acts on an object while it moves 2 meters, can we calculate how much work was done with no other information? Explain.
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Most electrical appliances are rated in watts. Does this rating depend on how long the appliance is on? (When off, It is a zero-wan device.) Explain in terms of the definition of power.
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A constant 20-N force pushes a small ball in the direction of the force over a distance of 5.0 m. What is the work done by the force?
A crate on rollers is being pushed without frictional loss of energy across the floor of a freight car (see the following figure). The car is moving to the right with a constant speed v0 . If the crate starts at rest relative to the freight car, then from the work-energy theorem, Fd=mv2/2, where d, the distance the crate moves, and v , the speed of the crate, are both measured relative to the freight car. (a) To an observer at rest beside the tracks, what distance d is the crate pushed when it moves the distance d in the car? (b) What are the crate’s initial and final speeds v0 and v as measured by the observer beside the tracks? (c) Show that Fd=m(v)2/2m(v0)2/2 and, consequently, that work is equal to the change in kinetic energy in both reference systems.