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December 22, 2014

December 22, 2014

Posted by **laila** on Saturday, March 19, 2011 at 8:59pm.

What should the speed of the mass be for θ to be 46°?

What is the tension in the string?

- physics -
**Damon**, Saturday, March 19, 2011 at 9:17pmI guess we are talking about the ball hanging from a hook and 46 degrees above vertical?

Ac = m v^2/r

T = tension

T sin 46 = m v^2/r

T cos 46 = m g

so

tan 46 = v^2/(rg)

v^2 = r g tan 46

but

r = 3 sin 46

so

v^2 = (3 sin 46)(9.8)tan 46

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