- #1
xzibition8612
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Homework Statement
See attachment.
Homework Equations
(1) F=ma
(2.13) W=ΔT
(2.20) (weight) x (decrease in altitude of mass center of body)
The Attempt at a Solution
I don't get where |v(t1)| and |v(t2)|^2 comes from. The book says |v(t1)| = 0, which I suppose is because initially there was no movement, so kinetic energy is 0? Does |v(t1)|=0 have anything to do with T=mgsinθ+mlθ'^2?
Then it says |v(t2)|^2 = l^2θ'^2, and this totally confused me. First, why is v(t2) squared and not v(t1)? Second, obviously v(t2) is somehow related to T=mgsinθ+mlθ'^2, but I don't see how you get v(t2) from that. Also originally θ'^2 was already squared, so wouldn't |v(t2)|^2 = l^2θ'^4??
Very confused on this.
Any help would be appreciated thanks.