90-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.2 s. (a) Calculate the mechanical work done by the sprinter during this time. 5445 (b) Calculate the average power the sprinter must generate. 1047

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)...
icon
Related questions
Topic Video
Question

please help with part C :) Thank you!

**Problem Statement:**

A 90-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.2 seconds.

**Questions:**

(a) **Calculate the mechanical work done by the sprinter during this time.**

- **Answer:** 5445 J (Joules)

(b) **Calculate the average power the sprinter must generate.**

- **Answer:** 1047 W (Watts)

(c) **If the sprinter converts food energy to mechanical energy with an efficiency of 25%, at what average rate is he burning Calories?**

- **Attempted Answer:** 62.6 (marked incorrect)

**Explanation:**

In part (c), it seems there's a calculation error. To find the average rate at which the sprinter is burning Calories, we need to calculate the total energy expenditure and account for the efficiency.

**Calculation Tips:**

1. Convert the work done to Calories (1 Calorie = 4184 Joules).
2. Account for the 25% efficiency.

This information could be used to guide students in understanding the relationship between mechanical energy, power, and metabolic energy expenditure.
Transcribed Image Text:**Problem Statement:** A 90-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.2 seconds. **Questions:** (a) **Calculate the mechanical work done by the sprinter during this time.** - **Answer:** 5445 J (Joules) (b) **Calculate the average power the sprinter must generate.** - **Answer:** 1047 W (Watts) (c) **If the sprinter converts food energy to mechanical energy with an efficiency of 25%, at what average rate is he burning Calories?** - **Attempted Answer:** 62.6 (marked incorrect) **Explanation:** In part (c), it seems there's a calculation error. To find the average rate at which the sprinter is burning Calories, we need to calculate the total energy expenditure and account for the efficiency. **Calculation Tips:** 1. Convert the work done to Calories (1 Calorie = 4184 Joules). 2. Account for the 25% efficiency. This information could be used to guide students in understanding the relationship between mechanical energy, power, and metabolic energy expenditure.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Mechanical Work done
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
College Physics
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON