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Chapter 9: Q. 61 (page 631)

Computing Work Find the work done by a force of 5pounds acting in the direction 60掳to the horizontal in moving an object 20feet from (0,0) to (20,0).

Short Answer

Expert verified

The work done is 50ft-lb.

Step by step solution

01

Step 1. Given information 

We are given that work done by a force of 5pounds acting in the direction 60掳to the horizontal.

02

Step 2. Finding the work done

It can be seen that the force is at 60鈭�from the horizontal which causes a horizontal displacement of 20 feet. So, the component of the force in the direction of the displacement is,

Fcos60掳=F2

We know that,

W=Force脳displacementW=F2脳r

Putting the value of r, we get

localid="1647312942535" W=5lb2脳20ftW=50ft-lb

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