Posted by **Donna** on Tuesday, October 16, 2007 at 5:38pm.

Can you please help me with the following questions? please.

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?

## Answer This Question

## Related Questions

- physics - 1. how much work do you do on a 25-kg backpack when you walk a ...
- science - a crane does 62,500. J of work lifting a 120.-N backpack? a. How high ...
- physics. please help - A worker pushes a 820 N crate with a horizontal force of ...
- Physics- Work - A worker pushes a 1.50*10^3 N crate with a horizontal force of ...
- physics - 11. You did 150. J of work lifting a 120.-N backpack. a. How high did ...
- PHYSICS - Hi! I have some questions from a study guide in my physics class, and ...
- physics - A gardener pushes a box of tools across a driveway by applying a 27.5...
- Physics - Could someone please explain how you get this answer??? A skier with a...
- Physics - A boy pushes his friend across a skating rink. Since the frictional ...
- physics - 1. A man pushes on a box at an angle of 30.0° with a force of 20.0 N ...

More Related Questions