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RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
First question, why is \(U_i=mgh_f\) instead of \(U_i = mgh_i\)?
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
that is the total energy of the system!! the energy of the system is constant if there were no other forces acting. i.e. Kinetic Energy + Potential Energy = constant = total energy now given that the pendulum starts from rest at height h_i, K.E. = 0, total energy = P.E
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
But with the initial height hi, isn't the PE = \(mgh_i\)? Why is it \(mgh_f\)?
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
dw:1353427300243:dw
 one year ago

RolyPoly Group TitleBest ResponseYou've already chosen the best response.0
Initial PE = mg(llcosθi) = mgl (1cosθi) Final PE = mg(llcosθf)= mgl(1cosθf) PE loss = change in PE = mgl[(1cosθf)  (1cosθi)] = mgl(cosθi  cosθf) ??
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
dw:1353430286611:dw
 one year ago

experimentX Group TitleBest ResponseYou've already chosen the best response.0
since l is defined as the distanced from pivoted point to the center of mass ... the energy of the system is \( mgl (1  \cos \theta) \) ... this is the total energy of the system ... probably experiment expects you to observe until the blob halt's to move.
 one year ago
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