Question: [ tau = mathbf { r } times mathbf { F } ] Suppose a person lifting a weight

\[
\tau=\mathbf{r}\times \mathbf{F}
\]
Suppose a person lifting a weight extends his arm upward at \(40^{\circ}\) above the horizontal while holding a \(70-\mathrm{N}\)(about 16-lb) weight in his hand. His arm is 63 cm long from the shoulder socket to the weight. What is the magnitude of the torque?
(Use decimal notation. Give your answer to four decimal places.)
\ [ \ tau = \ mathbf { r } \ times \ mathbf { F }

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