Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

A 70 kg person runs at a speed of 4.50 m/s. Assume that 100 J of kinetic energy is lost between heel contact and

A 70 kg person runs at a speed of 4.50 m/s. Assume that 100 J of kinetic energy is lost between heel contact and mid-stance. Assume also that the change in gravitational potential energy between heel contact and mid-stance is negligible 1. What is the runners speed at mid-stance? Enter your answer in units of m/s. 2. Assume the Achilles tendon has absorbed 32 J and the plantar fascia in the foot has absorbed 19 J at mid-stance. If the Achilles tendon returns 92% of its energy, and the plantar fascia returns 79% of its energy, how much mechanical energy must be actively generated through muscle contractions for the person to leave the ground with the same kinetic energy as was present at foot contact. (Enter your answer in units of Joules/Step) 3. Regardless of your answer above, assume that for another runner, 58.21 J/step needs to be generated Assume this runner maintains a cadence of 170 steps per minute and muscles are 21% efficient in converting metabolic energy into mechanical energy. Estimate how many Calories are burned by propulsive muscles when running for 1 hour? (1 Calorie is equal to 4200 J). Enter your answer in units of Calories 

A 70 kg person runs at a speed of 4.50 m/s. Assume that 100 J of kinetic energy is lost between heel contact and mid-stance. Assume also that the change in gravitational potential energy between heel contact and mid-stance is negligible. 1. What is the runner's speed at mid-stance? Enter your answer in units of m/s. 2. Assume the Achilles tendon has absorbed 32 J and the plantar fascia in the foot has absorbed 19 J at mid-stance. If the Achilles tendon returns 92% of its energy, and the plantar fascia returns 79% of its energy, how much mechanical energy must be actively generated through muscle contractions for the person to leave the ground with the same kinetic energy as was present at foot contact. (Enter your answer in units of Joules/Step) 3. Regardless of your answer above, assume that for another runner, 58.21 J/step needs to be generated. Assume this runner maintains a cadence of 170 steps per minute and muscles are 21% efficient in converting metabolic energy into mechanical energy. Estimate how many Calories are burned by propulsive muscles when running for 1 hour? (1 Calorie is equal to 4200 J). Enter your answer in units of Calories

Step by Step Solution

3.49 Rating (149 Votes )

There are 3 Steps involved in it

Step: 1

Required s... blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Physics Principles with Applications

Authors: Douglas C. Giancoli

7th edition

978-0321869111, 321625927, 9780321733627, 321869117, 9780321625922, 321733622, 978-0321762429

More Books

Students also viewed these Accounting questions

Question

B $2,580.00 C $14,930.56 MULTIPLE CHOICE Question 7 Listen

Answered: 1 week ago