Assume that she moves up at a constant speed. The triceps muscle at the back of her upper arm has an effective lever arm of 1.75 cm, and she exerts force on the floor at a horizontal distance of 20.0 cm from the elbow joint. How much work does she do if her center of mass rises 0.240 m? What is her useful power output if she does 25 pushups in one minute?

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Assume that she moves up at a constant speed. The triceps muscle at the back of her upper arm has an effective lever arm of 1.75 cm, and she exerts force on the floor at a horizontal distance of 20.0 cm from the elbow joint. How much work does she do if her center of mass rises 0.240 m? What is her useful power output if she does 25 pushups in one minute?

Title: Analyzing Forces in a Plank Position

**Illustration Description:**

The image shows a person in a plank position. The person's body is horizontal to the ground, supported by their toes and hands. The focus is on demonstrating the forces acting on the body and their respective distances.

**Key Elements:**

1. **Mass (m):** The person has a mass of 50.0 kg.

2. **Center of Gravity (CG):** The center of gravity is indicated near the middle of the body.

3. **Weights and Forces:**
   - **w:** The weight of the person, acting downwards from the center of gravity (CG).
   - **F_p (Force from Feet):** The force exerted by the feet, depicted with an upward arrow at the feet.
   - **F_reaction (Reaction Force):** The force exerted by the hands, depicted with an upward arrow at the hands.

4. **Distances:**
   - The distance from the feet to the CG is 0.90 meters.
   - The distance from the hands to the feet along the body is 1.50 meters.

This image represents the principles of static equilibrium where the sum of forces and the sum of moments around any point are zero. The illustration helps explain the balance of forces in a plank position, emphasizing how human biomechanics manage weight distribution.
Transcribed Image Text:Title: Analyzing Forces in a Plank Position **Illustration Description:** The image shows a person in a plank position. The person's body is horizontal to the ground, supported by their toes and hands. The focus is on demonstrating the forces acting on the body and their respective distances. **Key Elements:** 1. **Mass (m):** The person has a mass of 50.0 kg. 2. **Center of Gravity (CG):** The center of gravity is indicated near the middle of the body. 3. **Weights and Forces:** - **w:** The weight of the person, acting downwards from the center of gravity (CG). - **F_p (Force from Feet):** The force exerted by the feet, depicted with an upward arrow at the feet. - **F_reaction (Reaction Force):** The force exerted by the hands, depicted with an upward arrow at the hands. 4. **Distances:** - The distance from the feet to the CG is 0.90 meters. - The distance from the hands to the feet along the body is 1.50 meters. This image represents the principles of static equilibrium where the sum of forces and the sum of moments around any point are zero. The illustration helps explain the balance of forces in a plank position, emphasizing how human biomechanics manage weight distribution.
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