HW1 Secure https://session.masteringph item View?assignmentProblem ID=8201 S788&
ID: 3146087 • Letter: H
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HW1 Secure https://session.masteringph item View?assignmentProblem ID=8201 S788&offset;= next Item 6 previous | 6 of 16 next Correct Item 6 A crate is dragged 4.5 m along a rough floor with a constant velocity by a worker applying a force of 350 N to a rope at an angle of 30° to the horizontal Part B How much work does each of these forces do? Express your answers using two significant figures separated by commas. noral, gravity, Wwker, Wriction Submit My Answers Give Up Part C What is the total work done on the crate? Express your answer using two significant figures. W- Submit My Answers Give Up Continue .gile c .illCel. &14 PM 10/20/2017 4Explanation / Answer
b)
since normal reaction and gravity force is perpendicular to surface
Hence work done by these two force is zero
because= F.S = FScos 90=0
now work done by worker of force 350N is
W= 350*4.5*cos 30= 1363.99 J
and work done and force are in same direction hence Wworker=+ 1363.99 J
Work done by friction force = - uN*4.5 J
where u is friction coeficient and N is normal reavtion force
b)
Total work done by system = 1363.99 J - uN*4.5 J
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