#7 (a) nline HW 09 Begin Date: 11/10/2017 5:00:00 PM -Due Date: 11/20 2017 5:00:

Question

#7 (a)

nline HW 09 Begin Date: 11/10/2017 5:00:00 PM -Due Date: 11/20 2017 5:00:00 PM End Date: 4217:00.00 PM (1096) Problem 7: A device for exercising the upper leg muscle is shown in the figure, together with a schematic representation of an equivalent lever system. Femur 0kg Pivot Pivot Otheexpertt Calculate the force in newtons exerted by the upper leg muscle to lift the mass at a constant speed. Grade Summ Deductions Potential tan sin cotan asin acos atan acotan sinho cosO Submissions Attempts rema (10% per attemp detailed view 1 23

Explanation / Answer

7 a)

T = W = mg = 10 x 9.8 = 98 N

r = 2 cm

l = 35 cm

using the equilibrium of torque

T l = F r

(98) (35) = F (2)

F = 1715 N

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