Question

The ngure shows a lower leg being exercised. It has 47-N weight attached to the root and is extended at an angled with respect to the vertical. Consider a rotational axis at the knee, as indicated. (a) When 4 = 46°, find the magnitude of the torque that the weight creates. (b) At what angle does the magnitude of the torque have a value of 14 N.m? Axis 0.55 m 49 N (a) Number i Units (b) Number i Units

Answer 1

a . Perpendicular distance from the weight to the equilibrium line : 8=0.55xsin 46' 8=0.3905m Turque (2)= 0,3905 X 4 IN F = 19.13 N-m b.) 14 0.55 sin(o) x 49 = 14 sino = 4960:55 (0.5194) 0 = 31.299 Os sin