- #1

Smartguy94

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## Homework Statement

A mass M of 6.40E-1 kg slides inside a hoop of radius R=1.60 m with negligible friction. When M is at the top, it has a speed of 5.25 m/s. Calculate the size of the force with which the M pushes on the hoop when M is at an angle of 37.0°.

[URL]http://loncapa.gwu.edu/res/msu/physicslib/msuphysicslib/13_EnergyConservation/graphics/prob25_1015hoop2.gif[/URL]

## Homework Equations

Finding the F

## The Attempt at a Solution

i tried 2 times and both are wrong

first i tried

a=v^2/r

a=(5.25)^2/1.6

a=17.227

F=ma

F=(.640)(17.227)

F=11.025N and that's wrong...

second try i draw force diagram and got

tan(37)=opposite/adjacent

tan(37)mg=opposite

4.726N=the horizontal force of the gravity? and its wrong.

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