Torque of a man doing exercises against a wall?

In summary, the person in figure 8.31, weighing 800 N, is subjected to forces F1 and F2 with magnitudes of 100 N and 900 N respectively. The net torque on the person about axes through points A, B, and C perpendicular to the plane of the paper can be determined by neglecting the given force values and using the correct angles. The resulting values for the net torque are 207 Nm clockwise, 145 Nm clockwise, and 95.7 Nm clockwise.
  • #1
imatreyu
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Homework Statement



The person in figure 8.31 weighs 800 N. the forces F1 and F2 have magnitudes of 100 N and 900 N respective. Assume the force of gravity acts downward through point A as shown. Determine the net torque on the person about axes through points A, B, and C perpendicular to the plane of the paper.

Please neglect the force values given in this picture
The angles are correct, however.
Picture: http://img153.imageshack.us/img153/3927/picture4cb.png

Homework Equations



. . . .

The Attempt at a Solution



I don't know where to start!
I don't know where to place the axis of rotation. And what about the lever arm?
I really don't know how to align my axis.
 
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  • #2
Here are the answers:
207 Nm clockwise
145 Nm clockwise
95.7 Nm clockwise
 

1. What is torque?

Torque is a measure of the force that causes an object to rotate around an axis, and it is typically measured in newton-meters (Nm). In the context of exercises against a wall, torque refers to the force exerted by a person's muscles against the wall.

2. How is torque calculated?

Torque is calculated by multiplying the force applied by the distance from the axis of rotation. In the case of exercises against a wall, the force is the person's muscle strength, and the distance is the distance between the person's body and the wall.

3. What muscles are involved in exercises against a wall?

The muscles involved in exercises against a wall can vary depending on the specific exercise, but generally, they involve the muscles of the upper body, such as the chest, shoulders, and arms. The core muscles may also be engaged to maintain stability.

4. How does the angle between the person's body and the wall affect torque?

The angle between the person's body and the wall can affect the amount of torque produced. As the angle decreases, the distance between the person's body and the wall decreases, resulting in a decrease in torque. This is why exercises against a wall can become more challenging as the person's body becomes more parallel to the wall.

5. Can torque be increased during exercises against a wall?

Yes, torque can be increased during exercises against a wall by increasing the force exerted by the muscles or by increasing the distance between the body and the wall. This can be achieved by changing the position or angle of the body, using resistance bands, or adding weights to the exercise.

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