69.  The drawing shows a lower leg being exercised. It has a 49-N weight attached to the foot and is extended at an angle q with respect to the vertical. Consider a rotational axis at the knee. (a) When q = 90.0°, find the magnitude of the torque that the weight creates. (b) At what angle q does the magnitude of the torque equal 15 N × m?

 

w0447

 

We will find the torque caused by F using the perpendicular distance r^ which from the diagram above r^ = r sin(q)

So for q = 90.0°

 

If t = 15 m N

 

 

 

q = 90.0°

t = 15 m N

 

 

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This page last updated on January 11, 2020