Log In Start studying!

Select your language

Suggested languages for you:
Answers without the blur. Sign up and see all textbooks for free! Illustration

Q 31E

Expert-verified
College Physics (Urone)
Found in: Page 318

Answers without the blur.

Just sign up for free and you're in.

Illustration

Short Answer

We analyzed the biceps muscle example with the angle between forearm and upper arm set at 90o. Using the same numbers as in Example 9.4, find the force exerted by the biceps muscle when the angle is 120o and the forearm is in a downward position.

The force exerted by the biceps muscle is 407N.

See the step by step solution

Step by Step Solution

Step 1: Given Data

The diagram for the biceps muscle is shown below:

Step 2: Calculation of the force

The free body diagram is shown below:

As the force applied by the biceps muscle is perpendicular to the forearm, applying the condition of equilibrium under torque, we can write,

FBr1=War2+Wbr3cos30°FB=War2r1+Wbr3r1cos30°=2.5×9.8×164.0+4×9.8×384.0cos30°=407 N

Thus, the force exerted by the biceps muscle is 407 N.

Recommended explanations on Physics Textbooks

94% of StudySmarter users get better grades.

Sign up for free
94% of StudySmarter users get better grades.