The drawing shows an overhead view of a horizontal bar that is free to rotate ab

Question

The drawing shows an overhead view of a horizontal bar that is free to rotate about an axis perpendicular to the page. Two forces act on the bar, and they have the same magnitude. However, one force is perpendicular to the bar, and the other makes an angle with respect to it. The angle can be 90, 45, or 0. Rank the values of according to the magnitude of the net torque (the sum of the torques) that the two forces produce, largest net torque first.

a.

90, 45, 0

b. 0, 45, 90

c. 45, 0, 90

90, 45, 0

Explanation / Answer

when phi = 90 deg

then Net torqu action is Tnet = T1+T2= 0 N-m

when phi = 45 deg

Tnet = T1+ T2 = -F*r*sin(45) +(F*r*sin(90)) = 0.292*F*r

when phi = 0 deg

Tnet = T1+T2

Tnet = -F*r*sin(0) +(F*r*sin(90)) = F*r

so the answer is 0 deg ,45 deg.90 deg

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