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 - 11. You did 150. J of work lifting a 120.-N backpack. a. How high did...
- Physics - You are carrying a backpack across campus. What is the work done by ...
- physics - If You did 150 joules of work lifting a 120 newton backpack.A) How ...
- math - I came across with this last problem that I don't get on this sheet. Dan'...
- Physics - Do the following calculations for a 1150 kg car. a. How much work ...
- math - Ivan has completed 45% of his walk. He has already walked 9 km. How much ...
- physics. please help - A worker pushes a 820 N crate with a horizontal force of ...
- physics - A constant horizontal pull of 8.25 N drags a box along a horizontal ...

More Related Questions