- #1

Medgirl314

- 561

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**Solved it! Nope. -- Piano slipping down a ramp**

## Homework Statement

Two men loading a 900 kg piano onto a truck lose control and the piano slips, rolling down the loading ramp. The ramp is a 12 degree incline that is 3.2 m long. How long does it take the piano to reach the bottom of the ramp? Assume there is no friction.

## Homework Equations

My physics teacher found this equation for acceleration for an object on an incline:

a=g(sin)(theta)-(mu)g(cos)(theta)

I tried tweaking it a bit. I think the (mu)g(cos) can be left out since mu is zero.

a=g(sin)theta

a=9.8(.20)

a=2.03 m/s^2

Easy, right?

## The Attempt at a Solution

Nope. Not easy. The equation I found above doesn't take mass into consideration. Using this acceleration as my change in velocity, I get t=2.03/3.2=0.63 s. Reasonable enough. But what about the mass? Where did I go wrong?

Thanks in advance!