# Force Question

1. Oct 20, 2005

### faet

Okay, the question is:

A 190kg block is pulled at the constant speed of 4.8m/s across a horizontal floor by an applied force of 130N directed 37deg above the horizontal. What is the rate at which the force does work on the block? (in W)

to find this, would i multiply 130by cos(37), then by 4.8 to get work/sec?

2. Oct 20, 2005

### Claude Bile

A couple of points;

- Consider what would happen if the force was applied parallel to the surface (so the angle is zero). Do you still think you should take the cosine?
- Review the definition of work. What quantities do you then need to calculate to find the amount of work done per second?

Also, this thread should be moved to the Homework Help section.

Claude.

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