A weightlifter is attempting a biceps curl with a 167 N barbell. The moment arm

Question

A weightlifter is attempting a biceps curl with a 167 N barbell. The moment arm of the barbell about the elbow joint is 0.53 m. The moment arm of the elbow flexor muscles is 0.07 m. How much force must be produced by these muscles to hold the 167 N barbell in static equilibrium? 12,0000 What is the net torque (in ft-lb) when you are holding a 6 lb weight 1.1 ft from your elbow (producing a clockwise torque) and your biceps is generating a 60 lb force with a moment arm of 0.3 ft. (producing a counterclockwise torque)? 90,000 Mike runs in lane one around a curve, while Maurice runs in lane eight around the same curve. The radius of lane eight is twice as big as the radius of lane one. If Mike has to run 50 m to get fully around the curve in lane one, how far does Maurice have to run to get fully around the curve in lane eight? 100,0000

Explanation / Answer

net torqe about elbow joint = 0

torqe due to weight = torque due to mscle

167*0.53 = F*0.07

F = 1264.4 N

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Q27)

clcokwise torque is negative

anti clcokwise torque is positive

net torque = -(6*1.1) + (60*0.3) = 11.4 lb ft

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Q28)

length of lane 1 = 2*pi*r1 = 50 m

length of lane 8 = 2*pi*r2

given r2 = 2*r1

length of lane 8 = 2*pi*r2 = 2*pi*2*r1 = 2*50 = 100 m <<<---------answer

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