# Physics help

1. Oct 20, 2004

### zero1520

physics help!!!

Ok, I have understood every problem we have done so far except this one,

You are wearing shoes that have a coefficient of friction on rock of 0.70. On how steep a rock slope could you stand without slipping?

So far i have gotten:
Fs=Fparallel=
mu*W*costheta = W*sinTheta
w=mg

but if u cancel weights I got:
mu*costheta = sintheta

Im probably completely wrong, but thats what i got.

2. Oct 20, 2004

### Pyrrhus

Last edited: Oct 20, 2004
3. Oct 20, 2004

### zero1520

well i guess my problem is solving the trig cause i simplified to what he got on that similar problem

4. Oct 20, 2004

### Staff: Mentor

Looks good to me. The friction force must equal the parallel component of the weight. Good!

Now keep going: $\mu cos\theta = sin\theta$ ==> $tan\theta = \mu$. Now solve for $\theta$. (Use your calculator.)

5. Oct 20, 2004

### zero1520

ohhh alright i got it, thank you very much