In the figure below, a weightless plank has a weight W resting on
it. It is held up by two strings having tensions of T1
and T2. The left string makes an angle &theta degrees with
the horizontal, and the right string makes an angle of (90-&theta) degrees
with the horizontal. The weight W has a value of W = n1 T2.
The plank is n2 units long. What is the distance n3 that
the weight W is from the left end of the plank? n3 = ?
Note that n1 is unitless, and that n2 and n3
have the same units of length.
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