# Homework Help: Any ideas?

1. Sep 27, 2004

### strugglin-physics

The position of a mass m = 24 kg is given (in m) by x(t) = 7sin(5t). Calculate the magnitude of the maximum force acting on the mass.

All I know is that double prime equals acceleration, but I'm not even sure it that will help me solve the problem.

Anyone have any suggestions?

2. Sep 27, 2004

### BLaH!

Right...x'' is acceleration. And from that $$F = ma = mx''$$. All you have to do is find at what time(s) x'' is at its maximum value. Hint: The maximum value of $$sin t$$ or $$cos t$$ is 1.

3. Sep 27, 2004

### strugglin-physics

I got x'' to equal -.053308sin(5t) then at maximum height t equals 54, but y doesn't equal 1.

What did I do wrong?