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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)?

Respuesta :

Answer:

Force due to biceps is given as

[tex]F = 1991.05 N[/tex]

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

[tex]mg \times L = F \times d[/tex]

so we have

[tex]18.14 \times 9.8 \times 0.56 = F \times (0.05)[/tex]

[tex]F = 1991.05 N[/tex]

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