# Physics

posted by .

(part 1 of 2)
To move a refrigerator of mass 110 kg into a house, a mover puts it on a dolly and covers the steps leading into the house with a wooden plank acting as a ramp. The plank is 8.8 m long and rises 3.6 m. The mover pulls the dolly with constant velocity and with a steady force 730 N up the ramp. How much work does he perform? The acceleration of gravity is 9.8 m/s2 . Answer in units of J.
(part 2 of 2)
What is the minimal work required to lift the refrigerator into the house? Answer in units
of J.

• Physics -

730 N * 8.8 m = 6424 Joules

m g h = 110 * 9.8 * 3.6 = 3880 Joules

by the way the efficiency = 3880/6424 = .604 = 60.4 %

## Similar Questions

1. ### algebra

this is my last questions and I'm stumped can someone help, if not I'll continue You recently started the paperwork to purchase your new home, and you were just notified that you can move into the house in 2 weeks. You decide to hire …
2. ### algebra

In our math 116 we have a reading problem , it has several steps to it. I have gotten all the way to the end of the assignment and can't get the last questions. it has to do with Buying a Home, the problem is ( you recently started …
3. ### physics

two movers have to lift a refrigerator into a truck. one of the movers wants to life the refrigerator vertically, but the other mover wants to roll it up a ramp by applying a force parallel to the ramp. assume the height of the truck …
4. ### Algebra

(I got part a and b but not part c. Can you please explain to me how to get answer in c and also if my other answers are correct). 3. You recently started the paperwork to purchase your new home, and you were just notified that you …

Consider the Venn diagram below. The numbers in the regions of the circle indicate the number of items that belong to that region. (2 intersecting circles A & B, where A part is 50, B part is 110, and the intersecting part is 40) Determine: …
6. ### Math

Consider the Venn diagram below. The numbers in the regions of the circle indicate the number of items that belong to that region. (2 intersecting circles A & B, where A part is 50, B part is 110, and the intersecting part is 40) Determine: …
7. ### MATH

Consider the Venn diagram below. The numbers in the regions of the circle indicate the number of items that belong to that region. (2 intersecting circles A & B, where A part is 50, B part is 110, and the intersecting part is 40) Determine: …