- #1

rorte721

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- Homework Statement:
- Two workers load identical refrigerators into identical trucks by different methods. One worker has the refrigerator lifted upward onto the back of the truck, which is 1.5 meters above the ground. The other worker uses a ramp to slide the refrigerator onto the back of the truck. The ramp is 5.0 meters long, and raises the refrigerator 1.5 above the ground. The amount of work done by both workers is the same: 1800 J. What are the magnitudes of the forces each worker must exert to load the refrigerators?

- Relevant Equations:
- W=Fdcos(theta)

My teacher told me that answers are F=1200 N for lifting straight up and F= 360 N for using the ramp. I can get the force for lifting straight up by using 1800=F(1.5)cos(0) but I do not understand why for using the ramp the equation 1800 = F(1.5)cos(72.5) does not produce the correct answer.