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    veneG's Avatar
    veneG Posts: 2, Reputation: 1
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    #1

    Oct 18, 2011, 08:50 AM
    Physical science homework question about work and joules.
    While rearranging a dorm room, a student does 300 J of work in moving a desk 2.0 m. What was the magnitude of the applied horizontal force?
    JAMDixon's Avatar
    JAMDixon Posts: 22, Reputation: 1
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    #2

    Oct 18, 2011, 09:17 AM
    Work is the amount of force applied times the displacement (or distance) of the object. The equation is
    W = F(D) Force is calculated in Newtons and D is calculated in meters giving you a Newton-Meter which is commonly referred to as a Joule. To figure out your equation you must do some simple algebra to get your answer to the correct side of the equation. You are trying to get F alone, since you know how much work was done and the distance that means you need to get the force by itself. Your equation would then look like
    W = F/D which transfers to W/D = F. Plug in your values and you have: 300J/2.0m = F. Working that problem gives you F = 150N
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    chelcleanne Posts: 1, Reputation: 1
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    #3

    Sep 20, 2012, 03:27 PM
    A train increases its velocity from 5miles/hr to 55miles/hr in 20sec. What is its acceleration?
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