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
german
3 years ago
7

Chapter 16, Problem 63. A person is standing in a room at 18 ◦C. The exposed surface area and skin temperature of the person are

1.7 m2 and 32 ◦C, respectively, the convection heat transfer coefficient is 5 W/m2 ·K, and the emissivity of the skin and clothes is 0.9. Determine the total rate of heat transfer.
Physics
1 answer:
Juliette [100K]3 years ago
7 0

Answer:Q=248.011 W

Explanation:

Given

Temperature of Room T_{\infty }=18^{\circ}\approx 291 K

Area of Person A=1.7 m^2

Temperature of skin T=32^{\circ}\approx 305 K

Heat transfer coefficient h=5 W/m^2.k

Emissivity of the skin and clothes \epsilon =0.9

\Delta T=32-18=14^{\circ}

Total rate of heat transfer=heat Transfer due to Radiation +heat transfer through convection

Heat transfer due radiation Q_1=\epsilon \sigma A(T^4-T_{\infty }^4 )

where \sigma =stefan-boltzman\ constant

Q_1=0.9\times 5.687\times 10^{-8}\times 1.7\times (305^4-291^4)

Q_1=129.01 W

Heat Transfer due to convection is given by

Q_2=hA(\Delta T)

Q_2=5\times 1.7\times 14=119 W

Q=Q_1+Q_2

Q=129.01+119=248.011 W

You might be interested in
The nutritional label above came from a can of soup how many servings of soup would you need to eat to receive your recommended
Flauer [41]
Each serving gives 3 grams or 12% of daily recommended value. Divide 100% by 12% to get 8.33 servings to obtain the daily recommended value of 25 grams.
3 0
3 years ago
Which of the following is an accurate description of the amplitude of a wave?
nekit [7.7K]
The amplitude of the wave is the 'full height of the wave.' Amplitude is measured in m (meters) and is measured over the change of a single period.
3 0
3 years ago
Read 2 more answers
1) The current in a light bulb is 0.335 Amps. How long does it take for a total charge of 2.76 C to
uysha [10]

Answer:

Time=8.23880597 seconds

Explanation:

Quantity of charge(q)=2.76c

Current(I)=0.335A

Time(t)=?

t=q/I

t=2.76/0.335

t=8.23880597seconds

7 0
3 years ago
How much work is needed to lift a 3kg create a vertical displacement of 22m
Ulleksa [173]
I think its W= 647.239J
6 0
3 years ago
From the circuit above, predict which bulb (or bulbs) will be the brightest. Why do you think that?
inysia [295]

Answer:

the middle

Explanation:

the left one bulb gets power from the outher bulb

the one on right has more bulbs

7 0
3 years ago
Read 2 more answers
Other questions:
  • Sound with frequency 1220Hz leaves a room through a doorway with a width of 1.13m . At what minimum angle relative to the center
    8·1 answer
  • A 0.12 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 330 N/m. The block is pulle
    7·1 answer
  • A grocery cart with a mass of 16 kg is pushed at constant speed along an aisle by a force fp = 12 n which acts at an angle of 17
    13·2 answers
  • A 35 n object is on a 25 degree incline. the force of friction up the incline is 8.0 N.
    8·1 answer
  • Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions.
    14·1 answer
  • A stationary block resting on the ground is pulled up with a tension force of 100N, but does not leave the ground.
    5·1 answer
  • A glass rod is charged by the process of ________. *
    8·1 answer
  • Entific findings are useful
    15·1 answer
  • Help please help me out with this
    11·1 answer
  • Name 3-4 objects you use that depend on the electromagnetic spectrum.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!