Question

Billy picks up a 40 lb. dumbbell (mass = 18.14 kg). The center of his hand, where the dumbbell is held, is 56 cm (0.56 m) from the axis of his elbow. If his biceps brachii muscle pulls at a line 5 cm (0.05) from the axis of the elbow, how much force must it pull with in order to maintain an isometric muscle action (i.e. static equilibrium)?

Answer 1

Force due to biceps is given as

`F = 1991.05 N`

Step-by-step explanation:

For balancing the force we know that

Torque due to weight hold on his hand = torque due to force applied by biceps

So here we will have

`mg * L = F * d`

so we have

`18.14 * 9.8 * 0.56 = F * (0.05)`

`F = 1991.05 N`