Torque question

[dg_5021]

Athletes sometimes do an exercise called "curing weights." This exercise consists of holding the arm from the shoulder to the elbow steady and snug against the body while pulling a weight to the chest. Calculate the torque about the elbow caused by a 40 pound weight that makes an angle of 55 degrees with respect to the body.

i know the formula is torque= F s sin()
I found the force by coverting pound 40pounds/2.2046kg= 18.144kg x 1000g= 18144 g x 9.81m/s =177993force

torque= F s sin(55)= (18144g)(9.81 m/s2) (s) sin(55)=

but what is s they don't give me the s. do i have to use other formula? am confused? please help

[graphic7]

The formula you are referring to is this

\tau = radius * force * sin(\theta)

The radius should be the distance from one's elbow to hand. Then, it's just plug and chug.

[brewnog]

Looks like they want you to have a guess at the athlete's dimensions, or leave it in those terms.

Take care of your units up there too!