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Following vigorous exercise, the body temperature of an 80.0-kg person is $40.0^{\circ} \mathrm{C}$ At what rate in watts must the person transfer thermal energy to reduce the the body temperature to $37.0^{\circ} \mathrm{C}$ in 30.0 min, assuming the body continues to produce energy at the rate of 150 W? (1 watt $=1$ joule/second or $1 \mathrm{W}=1 \mathrm{J} / \mathrm{s} )$

$P_{t}=617 \mathrm{W}$

Physics 101 Mechanics

Chapter 14

Heat and Heat Transfer Methods

Thermal Properties of Matter

Cornell University

Rutgers, The State University of New Jersey

University of Washington

Hope College

Lectures

02:20

A solid, liquid, or gas is one of the three main states of matter. Solids have a definite shape and volume, and retain their shape when a force is applied to them. They are rigid, and do not flow to take on the shape of a container, but retain their own shape. Solids are held together by intermolecular forces, which are usually chemical bonds. Liquids have a free-flowing, continuous surface, and take the shape of a container. They flow to fill an available space. Their particles do not have a definite shape or volume, and they are not rigid. Gases have no definite shape or volume. They are not held together, and are not rigid. They flow to fill an available space. Gases are often described as being the state of matter with the lowest density.

06:13

Matter is a state of aggregation for a collection of atoms, molecules, ions, or particles. It is a general term for the substance of which all physical objects consist.

04:42

Following vigorous exercis…

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When resting, a person has…

01:52

A typical human has a mass…

03:22

mmh When resting, a person…

02:31

During heavy exercise, the…

03:44

If a person does $8.00 \ma…

02:51

The average person generat…

03:07

Keeping cool! A $65-\mathr…

02:45

For the human body, what i…

03:37

02:26

In a study of healthy youn…

03:52

BIO Suppose a highly train…

we are given that body is constantly producing the temper power at the rate of 1 50 What So whatever power we find out the body must lose should be added by this amount. Now let's find out the power one must lose, too. Decreased the temperature from 43 senses to 37 deep recesses. Now power is work done or transfer per unit. Time on DDE. Work done is mass or the heat transfers mass times specifications. Times change in temperature, divided by time. Let's substitute the values we are given. 80 is the mass. In terms of pillows, the specific eat off body is 3500 on change in temperature is three divided by time. Now time is given in terms of mentors. So 30 minutes we must multiplied by 60 to make it in terms of seconds. Now that we perform this calculation 80 times, 3500 times three divided by 1800. So the answer here is 4 67 I'm rounding off the answer to three significant digits. No, the athlete's body should lose this much amount of heat in 30 minutes, but he's not in 30 minutes four seconds to decrease the temperature from 40 degrees Celsius to 37 degrees Celsius. But bodies also producing heat at the rate of 1 50 from 1 50 What So net? How will transfer should be additional both powers that it's 1 50 this for 67? The answer here will be seven 16 work, So the book athlete's body should lose temperature at rate off 6 17 jewels for seconds. What is Jules for seconds to reduce the temperature by three degrees Celsius. So this temperature three dickless issues. Thank you.

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