   Chapter 12, Problem 58P

Chapter
Section
Textbook Problem

A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays in bed all day? (b) How long does it take him if he’s working out? (c) Calculate the amount of mechanical work necessary to lift a 120-kg barbell 2.00 m. (d) He drops the barbell to the floor and lifts it repeatedly. How many times per minute must he repeat this process to do an amount of mechanical work equivalent to his metabolic rate increase of 650 W during exercise? (e) Could he actually do repetitions at the rate found in part (d) at the given metabolic level? Explain.

(a)

To determine
how many hours are needed to work off the energy if he stays in bed all day.

Explanation

Given Info:

The basal metabolic rate of the weightlifter is 80.0W .

The calorie to be work off is 450.0calorie

Formula to calculate the volume time taken is,

Δt=ΔUP

• ΔU is the energy used
• P is the power.

Substitute 450.0calorie for ΔU and 80.0W for P to find the time taken,

Δt=(450Cal80

(b)

To determine
how long does it take if he is working out.

(c)

To determine
The amount of mechanical work necessary to lift the barbell.

(d)

To determine
the number of baseball lift in one minute.

(e)

To determine
whether he can do repetitions at the rate found in (d) at the given metabolic level.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

25-12 Which DNA and RNA bases are primary amines?

Introduction to General, Organic and Biochemistry

Explain why geometric isomerism is not possible in alkynes.

Chemistry for Today: General, Organic, and Biochemistry

What is the difference between speed and velocity?

Foundations of Astronomy (MindTap Course List)

How can a decrease in stratospheric ozone affect planktonic productivity?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin

__________move around for at least part of their life.

Biology: The Unity and Diversity of Life (MindTap Course List) 