## anonymous one year ago A sailor pulls a boat horizontally alongside a dock for 10.0 m with a rope angled at 40.0°. He uses a force of 100.0 N. How much work did he do on the boat? A. 766 J B. 643 J C. 1.00 * 10^3 J D. 4.00 * 10^4 J

1. Michele_Laino

here is the situation described in your problem: |dw:1433096507947:dw|

2. anonymous

yes:)

3. Michele_Laino

now, we have to apply this formula:

4. anonymous

which formula?

5. Michele_Laino

$W = Fd\cos \left( {40} \right) = 100 \times 10 \times \cos 40$

6. anonymous

7. Michele_Laino

yes! That's right!

8. anonymous

yay!! :D

9. Michele_Laino

:D