# science

posted by .

a crane does 62,500. J of work lifting a 120.-N backpack?
a. How high did you lift the backpack?
b. How much did the backpack weigh in pounds? (Hint: There are 4.448 N in one pound.)

• science -

a. 62,500 J = M g H

M g = 120 N.
Solve for H

b. 120 N/4.448 N/lb = ____lb

## Similar Questions

1. ### science

Mr.wilinson carried his backpack 12kilometers and set up camp on the edge of cutthroat lake it took him 3 hours to get there from the trailhead how much work did he do on his backpack on the hike in?
2. ### science

a mr wikinson backpack weighs 45 pounds if there are 453.7grams in one pound what is the mass of his backpack?
3. ### Algebra 1

you are hiking. the total weigh of your backpack and its contents is 13 3/8 pounds. you want to carry no more than 15 pounds. how many extra water bottles can you add to your backpack if each bottle weighs 3/4 pound?
4. ### physics

You take your backpack out of the car, hike to the top of a nearby mountain, and return with your backpack to your car at the bottom. Have you changed the amount of your backpack's mechanical energy?
5. ### physics

A backpack full of books weighing 58.0 rests on a table in a physics laboratory classroom. A spring with a force constant of 140 is attached to the backpack and pulled horizontally. If the backpack begins to slide when the spring ( …
6. ### Physical Science 2nd Semester

A student lifts a backpack with a force of 50 Newtons. She lifts the backpack 2 meters off the floor. Calculate the work that she has done.
7. ### physics

If You did 150 joules of work lifting a 120 newton backpack.A) How high did you lift the backpack?
8. ### physics

11. You did 150. J of work lifting a 120.-N backpack. a. How high did you lift the backpack?
9. ### SS

Nivea wants to buy a new backpack. She looks at different choices. One store has a yellow backpack and a large blue one that she likes. Another store has a big, red backpack and a smaller red one. Nivea wants a big backpack and she …
10. ### Physical Science

What is the weight of a 4.82 kg backpack in Newton and the acceleration of the backpack if a net force of 10.0 N is applied in m/s2?

More Similar Questions