- #1

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2. A block of mass

*m*slides around a circular path in a conic surface with vertex angle 2theta. Determine the speed of rotation at a height

*h*above the vertex.

Im lost at what to do for both problems. Any help would be appreciated. Thanks.

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- Thread starter LostStudent
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- #1

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2. A block of mass

Im lost at what to do for both problems. Any help would be appreciated. Thanks.

- #2

Chi Meson

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The centripetal force is provided by the horizontal component of T.

So: T*cos30 = m v^2/r

The vertical component of T balances the weight.

So: T*sin30 = mg

So T = (.25)(9.8) / sin30 = 4.9 N ?

Then use T to find V:

(4.9)(cos30) = (.25) v^2 / 1

4.24 / .25 = v^2

16.96 = v^2

v= 4.12 m/s

Right or wrong?

- #4

Chi Meson

Science Advisor

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doesn't it feel right? Notice how any value for mass would have worked?

- #5

Chi Meson

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