Homework Help: physics

Posted by caroline on Tuesday, October 26, 2010 at 7:33pm.

A water slide can be thought of as being frictionless. Let's say a slider starts from rest and goes down a slide that is 30 m long and is set at a 25 degree incline.

a) Determine the speed of the slider at the bottom of the slide.

b) Explain why you don't need to know the mass of the slider.

physics - bobpursley, Tuesday, October 26, 2010 at 7:36pm
PE at top=KE at bottom
mgh=1/2 m v^2
mg30/sinTheta= 1/2 mv^2
solve for v.
physics - caroline, Tuesday, October 26, 2010 at 7:38pm
sorry, what's mg?
physics - bobpursley, Tuesday, October 26, 2010 at 7:47pm
mg is mass * acceleration due to gravity, mg is weight.
physics - caroline, Tuesday, October 26, 2010 at 7:49pm
so i won't have a numerical answer?
physics - bobpursley, Tuesday, October 26, 2010 at 7:52pm
yes,notice m divides out. You have to put the values of g and SinTheta to get the answer. I dont serve on silver platters (just blueplate).

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