# Physics

posted by .

1. how much work do you do on a 25-kg backpack when you walk a horizontal distance of 100 m?
-I got 2,500 J

4. if you friend pushes a lawnmower four times as far as you do while exerting only half the force, which one of you does more work? how much more? ( I don't understand this question)

7.why does one get tired when pushing against a stationary wall when no work is done on the wall?
-I got because the wall is pushing back with the same equal amount of force.

9. which requires more work streching a strong spring a certain distance or streching a weak spring the same distace? Why?

## Similar Questions

1. ### physics

1. how much work do you do on a 25-kg backpack when you walk a horizontal distance of 100 m?

A worker pushes a 820 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic frictin between the crate and the floor is 0.22. a) How much work is done by the worker on the crate?
3. ### science

a crane does 62,500. J of work lifting a 120.-N backpack?
4. ### physics

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

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

Ivan has completed 45% of his walk. He has already walked 9 km. How much farther does he have left to walk?
7. ### math

I came across with this last problem that I don't get on this sheet. Dan's uncle ask him to come work for him at his men's clothing store. He will pay him 5% on his first \$1000 in sales and 8% on sales above \$100. How much will Dan …
8. ### Physics

You are carrying a backpack across campus. What is the work done by your verticals carrying force on the backpack?
9. ### Physics

Do the following calculations for a 1150 kg car. a. How much work must be done on the car to accelerate it from 0 to 60 km/h. **** Hi I am looking for advice on my questions below. This is my attempt at answering them.. Am i at least …
10. ### Math

Write each percent as a fraction and as a decimal. 7. 72% full 72/100 or .72 9. 500% increase Would it be 500/100 or 500/1000?

More Similar Questions