College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question
The upper leg muscle (quadriceps) exerts a force of 1220 N , which is carried by a tendon over the kneecap (The patella) at the angle shown in figure 5.43. Find the magnitude and direction of the force exerted by the knee cap on the upper leg bone ( the femur ) .
n?
degree (counter clockwise from an axis directed to the left ) ?
Transcribed Image Text:The image depicts a diagram of a human arm, illustrating angles and forces related to muscle function and joint movement. It is labeled as Figure 5.43.
Key components of the diagram include:
1. **Arm Diagram**: The anatomical structure shows a lateral view of the elbow joint.
2. **Angles**:
- A 65-degree angle is marked at the joint where the forearm is flexed.
- A 75-degree angle is shown at the intersection of two force vectors.
3. **Forces**:
- The diagram includes two primary force vectors, labeled as \( F_g \) and \( F_e \).
- \( F_g \) is depicted as a downward force applied at the forearm.
- \( F_e \) is shown as a diagonal force directed towards the joint, possibly representing muscle force or external load.
4. **Muscle Representation**:
- A section of muscle fibers is illustrated in red, indicating the point of application and direction of muscle contraction forces.
The diagram is likely used to analyze the biomechanics of the elbow joint, focusing on the interplay of muscle forces and angles during arm movements.
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