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March 30, 2017

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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 - ,

    PE at top=KE at bottom
    mgh=1/2 m v^2
    mg30/sinTheta= 1/2 mv^2
    solve for v.

  • physics - ,

    sorry, what's mg?

  • physics - ,

    mg is mass * acceleration due to gravity, mg is weight.

  • physics - ,

    so i won't have a numerical answer?

  • physics - ,

    yes,notice m divides out. You have to put the values of g and SinTheta to get the answer. I don't serve on silver platters (just blueplate).

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