1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
faust18 [17]
3 years ago
5

If the air temperature is the same as the temperature of your skin (about 30 ∘C), your body cannot get rid of heat by transferri

ng it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 71.0 kg person’s body produces energy at a rate of about 502 W due to metabolism, 82.0 % of which is converted to heat. [Recall that the normal internal body temperature is 98.6 ∘F and the specific heat capacity of the body is 3480 J/(kg⋅∘C) .] How many kilograms of water must the person's body evaporate in an hour to get rid of this heat? The heat of vaporization of water at body temperature is 2.42 \times 10^6\;{\rm J/kg}.The evaporated water must, of course, be replenished, or the person will dehydrate. How many 750 {\rm mL} bottles of water must the bicyclist drink per hour to replenish the lost water? (Recall that the mass of a liter of water is 1.00 {\rm kg}.)
Physics
2 answers:
Neko [114]3 years ago
3 0

Answer:

In That Case, It Gets Rid Of The Heat By Evaporating Water (sweat). During Bicycling, A Typical 72.0 Kgperson's Body Produces Energy At A Rate Of About 501 W Due To Metabolism ... If the air temperature is the same as the temperature of your skin (about 30 ∘C), your body cannot get rid of heat by transferring it to the air.

Explanation:

skelet666 [1.2K]3 years ago
3 0

Answer:

m=0.612kg

0.8164 bottles

Explanation:  the last part of the question says

How many kilograms of water must the person's body evaporate in an hour to get rid of this heat? The heat of vaporization of water at body temperature is 2.42 \times 10^6\;{\rm J/kg}.The evaporated water must, of course, be replenished, or the person will dehydrate. How many 750 {\rm mL} bottles of water must the bicyclist drink per hour to replenish the lost water? (Recall that the mass of a liter of water is 1.00 {\rm kg}.)

Convert 500 watts to joules/sec.

That is 500 J/sec. The problem states about 80% is converted to heat so 500 J/sec x 0.8 = ?? heat produced in 1 sec.

How many J is that per hour.

502 J/sec x (60 sec/min) x (60 min/hour)

1807200J

Rcallit is 82% efficient

1481904J

q=mlv

q=heat produced by the body in Joules

m=mass of water loss

lv=latent eat of vaporization in

1481904J=m*2.42*10^6j/kg

m=0.612kg

the same as 0.612L

0.612l/0.750L/bottle

0.8164 bottles

You might be interested in
How can you produce more power than an excavator?
alina1380 [7]
Just do energy spent divided by time to get your answer. With this we can say a human might be able to!
5 0
3 years ago
Read 2 more answers
What is in the universe
svp [43]
Everything is in the universe.
That's what the word means.
5 0
3 years ago
Read 2 more answers
A charge of q= +15 uC moves in a Northeast direction with a speed 5 m/s, 25 degrees East of a magnetic field, pointing North, wi
grin007 [14]

Explanation:

It is given that,

Magnitude of charge, q=15\ \mu C=15\times 10^{-6}\ C

It moves in northeast direction with a speed of 5 m/s, 25 degrees East of a magnetic field.

Magnetic field, B=0.08\ j

Velocity, v=(5\ cos25)i+(5\ sin25)j

v=[(4.53)i+(2.11)j]\ m/s

We need to find the magnitude of force on the charge. Magnetic force is given by :

F=q(v\times B)

F=15\times 10^{-6}[(4.53i+2.11j)\times 0.08\ j]

<em>Since</em>, i\times j=k\ and\ j\times j=0

F=15\times 10^{-6}[(4.53i)\times (0.08)\ j]

F=0.00000543\ kN

F=5.43\times 10^{-6}\ kN

So, the force acting on the charge is 5.43\times 10^{-6}\ kN and is moving in positive z axis. Hence, this is the required solution.

6 0
3 years ago
What phytophotodermatitis caused by?
Paraphin [41]

Phytophotodermatitis happens when certain plant chemicals cause the skin to become inflamed following exposure to sunlight.

3 0
3 years ago
Read 2 more answers
Momentum usually has the symbol p It is a vector, What is the correct way to
Nadya [2.5K]

Answer:

Add an arrow above the symbol p to show it is a vector. Sometimes it is italicized in textbooks.

Explanation:

6 0
3 years ago
Other questions:
  • Jeff's body contains about 5.46 L of blood that has a density of 1060 kg/m3. Approximately 45.0% (by mass) of the blood is cells
    8·2 answers
  • The most expensive benefit is usually ______. a. life insurance b. retirement c. health care d. day care
    13·2 answers
  • A forklift raises a box weighing 475N from the floor to a height of 18m in 12 seconds. What power is produced by the forklift mo
    9·1 answer
  • What was the greatest discovery by galileo during his inclined-plane experiments?
    7·1 answer
  • What is terminal speed? When a skydiver has reached terminal speed, what is the are resistance equal to? What is the skydiver’s
    6·2 answers
  • Find the current that flows in a silicon bar of 10-μm length having a 5-μm × 4-μm cross-section and having free-electron and hol
    11·1 answer
  • What happens to light that shines on an object but is not transmitted?
    9·1 answer
  • A jet transport has a weight of 2.25 x 106 N and is at rest on the runway. The two rear wheels are 16.0 m behind the front wheel
    12·1 answer
  • 1) You slam on the brakes of your car in a panic, and skid a certain distance on a straight level road. If you had been travelin
    13·1 answer
  • A dog running at 10 m/s is 30m behind a rabbit moving at 5 m/s. when will the dog catch up with the rabbit assuming both their v
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!