Homework Help: physics

Posted by Anonymous on Friday, March 9, 2012 at 6:27pm.

20.) A piano has been pushed to the top of the ramp at the back of a moving van. The workers think it is safe, but as they walk away, it begins to roll down the ramp.
If the back of the truck is 1.5 above the ground and the ramp is inclined at 29, how much time do the workers have to get to the piano before it reaches the bottom of the ramp?

physics - bobpursley, Friday, March 9, 2012 at 6:42pm
In the real world, a piano has considerable weight and therefore friction, which would reduce the net force, and acceleration down the plane.

Ignoring friction,
weight down the plane mg*cos29.

weight down the plane=m*a
a= g*cos29

vf= sqrt (2ad)=sqrt (2*a*1.5/sin29)

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