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
ioda
3 years ago
8

The freezer compartment in a conventional refrigerator can be modeled as a rectangular cavity 0.3 m high and 0.25 m wide with a

depth of 0.5 m. Determine the thickness of styrofoam insulation (k = 0.30 W/m⋅K) needed to limit the heat loss to 400 W if the inner and outer surface temperatures are −10 and 33°C, respectively.
Physics
1 answer:
Mkey [24]3 years ago
3 0

Answer:

Thickness of Styrofoam insulation is 0.02741 m.

Explanation:

Given that,

Height = 0.25 m

Depth = 0.5 m

Power = 400 W

Temperature = 33°C

We need to calculate the area of Styrofoam

Using formula of area

A=2(lb+bh+hl)

Put the value into the formula

A=2(0.3\times0.5+0.25\times0.5+0.5\times0.3)

A=0.85\ m^2

Inner surface temperature of freezer

T_{i}=-10°C=263\ K

Outer surface temperature of freezer

T_{o}=33+273=306\ K

We need to calculate the thickness of Styrofoam insulation

Using Fourier law,

q=\dfrac{kA}{L}(T_{o}-T_{i})

L=\dfrac{kA}{q}(T_{o}-T_{i})

Put the value into the formula

L=\dfrac{0.30\times0.85}{400}(306-263)

L=0.02741\ m

Hence, Thickness of Styrofoam insulation is 0.02741 m.

You might be interested in
Bettina spoke into a microphone during the school play to increase the sound of her voice so the audience could hear her speak.
grandymaker [24]
The loudness was increased by the amplifier which converted electrical energy into sound energy.
7 0
3 years ago
Read 2 more answers
A bullet leaves a gun with a horizontal velocity of 100 m/s. Calculate the distance it would travel in 1.3 seconds.
salantis [7]

Answer:

130m

Explanation:

You just have to multiply velocity by the time traveled:

100m/s * 1.3s = 130m!

5 0
3 years ago
Read 2 more answers
A hand-held video game is powered by batteries. After playing the game for several minutes, a student notices that the game feel
scoundrel [369]
I would say your answer is B- Some of the chemical energy from the batteries is converted into heat energy. 
7 0
3 years ago
Kyle has a mass of 54kg and is moving at 3 m/s what is his kinetic energy
Mars2501 [29]

Answer:

243J

Explanation:

K.E = 1/2 x 54 x 3^2

K.E = 1/2 x 54 x 9

K.E = 1/2 x 486

K.E = 486/2

K.E = 243J

6 0
3 years ago
Si el cuerpo no se mueve halle T
Aleks [24]
Well sorry but this is the wrong language.
3 0
2 years ago
Read 2 more answers
Other questions:
  • How do you producers consumers and decomposers all live in a cycle
    9·1 answer
  • What can happen if a body moves through speed of light
    14·2 answers
  • Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of oneâs birth. The on
    11·1 answer
  • A powerboat, starting from rest maintains a constant acceleration. After a certain time Δt, its displacement and velocity are Δr
    12·1 answer
  • Why is it useful to know the net force?
    12·2 answers
  • If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged
    14·1 answer
  • Anna will wear a black dress when she attends her cousin’s wedding. Which color(s) does the dress absorb?
    8·2 answers
  • A parallel-plate capacitor is charged by connecting it to a battery. After that the capacitor is disconnected from the battery a
    5·1 answer
  • A rectangular solid is 5m long, 2m high and 4m wide. The mass of the solid is 300g. Find the density of this solid.​
    15·1 answer
  • Given three different locations on Earth's surface, where will the weight of a person be greatest?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!