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
Verdich [7]
3 years ago
8

Considering this analogy (current = rate that heat flows through a window, and voltage = temperature difference across the windo

w), how does the resistance of an object depend on the length of the object through which current flows? (This is equivalent to the relationship between the rate of thermal energy transfer and the thickness of the window through which this energy flows.)
Physics
2 answers:
erastovalidia [21]3 years ago
8 0

Answer:

Explained

Explanation:

Resistance R in a current flow through an object is given by

R= \frac{\rho L}{A}

ρ = resistivity of the material

L= length of the object

A=  area of cross section

clearly resistance is directly dependent on length of the object.This means greater the length larger will be resistance to current.

thermal resistance R_th is given by

R_{th} = \frac{L}{KA}

L= length of the object

A=  area of cross section

K = Conductivity of the material

thermal resistance is also is directly dependent on length of the object.This means greater the length larger will be resistance to current.

finlep [7]3 years ago
8 0

Answer:

\dot Q\equiv I

R\equiv \frac{dx}{k.A}

\Delta T\equiv V

\dot Q=\frac{\Delta T}{(\frac{dx}{k.A} )}

I=\frac{V}{R}

Explanation:

For heat transfer through a window pane:

  • Let the temperature difference across the window pane be, \Delta T this temperature difference is the driving cause for the flow of heat, <em>likewise we have "V" the potential difference as the driving cause for the flow of charges.</em>
  • Let \dot{Q} be the rate of heat transfer, <em>likewise we have "I" as the rate of flow of charge.</em>
  • The heat transfer rate is inversely propotional to \frac{dx}{k.A}, where:

       dx is the thickness of the material across which the heat travels,

       k is the thermal conductivity of the material

       A is the area of the pane normal to the heat flow.

<em>        And for current we have a constant factor R called resistance to which         the current is inversely proportional to.</em>

<u>The heat transfer rate is given by the Fourier's Law as:</u>

\dot Q=k.A\frac{\Delta T}{dx}

can be further written as

\dot Q=\frac{\Delta T}{(\frac{dx}{k.A} )}...............................(1)

<u>The rate of flow of charge i.e. current is given by the Ohm's Law as:</u>

V=R.I

\Rightarrow I=\frac{V}{R}..............................................(2)

From equations (1) & (2)

\dot Q\equiv I

R\equiv \frac{dx}{k.A}

\Delta T\equiv V

You might be interested in
What is the change in thermal energy E if the coefficent of kinetic friction between the box and floor is .4 , the distance the
Jet001 [13]

This question can be solved using the concept of friction energy.

The thermal energy change is b "258.4 J".

The change in thermal energy will be equal to the friction energy produced during the motion of the box.

Change\ In\ Thermal\ Energy = E = Friction\ Energy\\\\E = \mu fd

where,

μ = coefficient of kinetic friction = 0.4

f = force applied = 38 N

d = distance traveled by the box = 17 m

Therefore,

E = (0.4)(38\ N)(17\ m)

<u>E = 258.4 J</u>

Learn more about friction energy here:

brainly.com/question/1343045?referrer=searchResults

7 0
2 years ago
Identify three specific situations in which machines make work easier.
Komok [63]
Construction, like building a home/building, digging, like in a mine, and opening a soda can, where the part to open is a lever.
5 0
3 years ago
How do scientist determine the the number of iso types?
mash [69]
If you are talking about Isotopes then I believe it is the amount of atoms that have different amounts of neutrons ,but the same number of protons.
3 0
3 years ago
Which of the following has the least impact on the environment?
seraphim [82]
The answer should be A) solar power
8 0
3 years ago
Read 2 more answers
Describe how the ocean influences climate by storing heat and water? Give one example to justify your answer.
just olya [345]
The sun light that received by the water in the ocean will increase the average temperature of the water and make it warmer.
With the help of wind and current, the warm water will spread out to another region, and increasing the average temperature in that region and affecting its overall climate.
Example The temperature rise in Valdivia<span>, Chile and in Beijing, China after receiving warm water from arctic.</span>
7 0
3 years ago
Other questions:
  • 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is locat
    14·1 answer
  • Which of the following affects the rate constant of a reaction?
    9·1 answer
  • A projectile is launched horizontally from a height of 8.0 m. The projectile travels 6.5 m before hitting the ground.
    5·1 answer
  • How do find the force of buoyancy ​
    12·1 answer
  • Gravity is defined as: Select one: a. an apple falling from a tree toward the ground. b. ability to accomplish a job with the le
    12·1 answer
  • Is there any induced current in the pickup coil when the polarity of the bar magnet is flipped?
    15·1 answer
  • What is the electric field at the point x=6.5 m? positive e-fields point to the right.?
    8·1 answer
  • By comparing fossils of a species from long ago to those of today, we can conclude that *
    5·1 answer
  • If you're driving 55 MPH and you suddenly need to stop, how many feet will you travel before the car comes to a stop
    13·1 answer
  • How does a balanced chemical equation demonstrate the Law of Conservation of Mass?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!