College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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**Real-world application.**

**Equipment:** a barbell (above 10 lbs) or a heavy book, a meter stick or another length measuring instrument. 

Lift the barbell by doing a bicep curl. Watch the change of the shape of your bicep. What is the role of the bicep in lifting the barbell? Where is it attached to the arm? Consider the axis of rotation to be in the elbow joint. How far away is the barbell from the axis of rotation? How far is the bicep from the axis of rotation? Estimate the force that the biceps muscle exerts on the forearm holding the barbell. What assumptions did you make in working the problem?

**Diagram Explanation:**

The diagram illustrates a simple representation of a human arm engaged in a bicep curl with a barbell. The image shows:

- The upper arm is represented vertically.
- The bicep is depicted as a thick, dark band between the upper arm and forearm.
- The forearm is shown horizontally, holding a barbell at its end.
- The axis of rotation is indicated at the elbow joint.
- The distance from the axis of rotation (elbow joint) to the bicep attachment is 4.0 cm.
- The distance from the axis of rotation (elbow joint) to the barbell is 40 cm.
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Transcribed Image Text:**Real-world application.** **Equipment:** a barbell (above 10 lbs) or a heavy book, a meter stick or another length measuring instrument. Lift the barbell by doing a bicep curl. Watch the change of the shape of your bicep. What is the role of the bicep in lifting the barbell? Where is it attached to the arm? Consider the axis of rotation to be in the elbow joint. How far away is the barbell from the axis of rotation? How far is the bicep from the axis of rotation? Estimate the force that the biceps muscle exerts on the forearm holding the barbell. What assumptions did you make in working the problem? **Diagram Explanation:** The diagram illustrates a simple representation of a human arm engaged in a bicep curl with a barbell. The image shows: - The upper arm is represented vertically. - The bicep is depicted as a thick, dark band between the upper arm and forearm. - The forearm is shown horizontally, holding a barbell at its end. - The axis of rotation is indicated at the elbow joint. - The distance from the axis of rotation (elbow joint) to the bicep attachment is 4.0 cm. - The distance from the axis of rotation (elbow joint) to the barbell is 40 cm.
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