A massless beam supports two weights as shown.
Find W such that the supporting force at
A is zero (static equilibrium). Force is 471 L' is L/3 and L'' is 9. Answer in nearest whole number.

Taking moments about B

N x L'' = W x L'

Here the moment is = force x perpendicular distance between the axis of rotation and the point of applied force .

Here L' = L/3 and L'' = 9

Thus from figure

471 x 9 = W x

But L'' = ( L - ) = = 9

Thus W = 471 N

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.