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
yulyashka [42]
4 years ago
14

Name three major heat transfer mechanisms giving one example of each from day-to-day life. Also explain the physical mechanism b

ehind these modes of heat transfer.
Engineering
1 answer:
VLD [36.1K]4 years ago
5 0

Answer:

The major heat transfer mechanisms are:

  • Conduction: When a body at higher temperature comes in direct contact with  a body at lower temperature flow of heat takes place from higher temperature to lower temperature due to the Kinetic energy of particles in motion and this motion continues till equilibrium is reached. Heat transfer by this method is called conduction. For example: When a hot metal comes in direct contact with a cold metal, heat is transferred by conduction.
  • Convection: This method of heat transfer applies to fluid motion of particles. Here, the heat transfer is due to thermal energy of the fluid particles. Due to the differences in their density the liquid over hot surface expands and rises up and heat flows from high to low temperatures. For example: When earth's surface is heated by the sun, the warm air comes up and cool air comes in
  • Radiation: Thermal radiations are generated by electromagnetic waves. These are the result of motion of random molecules in the matter which carry the energy from the emitting body and provides motion to the charge particles of EM waves. At high temperature, shorter wavelength is produced and vice-versa. For example: visible light, UV, IR, etc

You might be interested in
Time complexity of merge sort
vovangra [49]

Answer:

The correct answer is "O (n\times Log n)". A further explanation is given below.

Explanation:

  • Throughout all the three instances (worst, average as well as best), the time complexity including its Merge sort seems to be O (n\times Log n) as the merge form often splits the array into two halves together tends to linear time to combine multiple halves.
  • As an unsorted array, it needs an equivalent amount of unnecessary capacity. Therefore, large unsorted arrays are not appropriate for having to search.
6 0
3 years ago
Most pedestrian fatalities occur
Makovka662 [10]

Answer: Outside an intersections

Explanation:

6 0
3 years ago
Evaluate each of the following and express with an appropriate prefix: (a) (430 kg)^2 (b) (0.002 mg)^2, and (c) (230 m)^3
Mekhanik [1.2K]

Answer:

a)0.185g^2

b)4μg^2( Micrograms)

c)12.167hm^3( cubic hectometer)

Explanation:

To solve this problem, we must first use the calculator to solve each of the points, then knowing the number of zeros on the left or on the right, we choose a unit with which it is better to see the unit

A)

(430 kg)^2=184900kg^2=0.185g^2

B)

(0.002 mg)^2=4x10^-6mg^2=4μg( Micrograms)

c)

(230 m)^3=12167000m^3=12.167hm^3( hectometer)

6 0
3 years ago
The maximum gage pressure is known to be 10 MPa in a spherical steel pressure vessel having a 200 mm outer diameter and a(n) 2 m
VikaD [51]

Answer:

factor of safety = 0.8

Explanation:

given data

maximum gauge pressure in steel p = 10 MPa

outer diameter do = 200  mm

wall thickness t = 2 mm

ultimate stress of the steel σU = 400 MPa

solution

We check the type of shell that is

\frac{t}{do} =\frac{6}{200}

so we can see that that is    

so that it mean vessel is a thin shell now we can we get maximum pressure by the maximum tensile stress is

σ = \frac{p\times do}{2t}     .......................1

put here value and we get

σ =  \frac{10\times 200}{2\times 2}  

σ =  500 MPa  

so factor of safety will be express as

factor of safety = \frac{\sigma U}{\sigma}     ..........2

factor of safety = \frac{400}{500}  

factor of safety = 0.8

6 0
4 years ago
thermal energy is being added to steam at 475.8 kPa and 75% quality. determine the amount of thermal energy to be added to creat
eduard

Answer:

q_{in} = 528.6\,\frac{kJ}{kg}

Explanation:

Let assume that heating process occurs at constant pressure, the phenomenon is modelled by the use of the First Law of Thermodynamics:

q_{in} = h_{g} - h_{mix}

The specific enthalpies are:

Liquid-Vapor Mixture:

h_{mix} = 2217.2\,\frac{kJ}{kg}

Saturated Vapor:

h_{g} = 2745.8\,\frac{kJ}{kg}

The thermal energy per unit mass required to heat the steam is:

q_{in} = 2745.8\,\frac{kJ}{kg} - 2217.2\,\frac{kJ}{kg}

q_{in} = 528.6\,\frac{kJ}{kg}

7 0
4 years ago
Other questions:
  • A conducting spherical shell having an inner radius of 3 cm and outer radius of 4.3 cm carries a net charge of 9.6 μC. A conduct
    15·1 answer
  • A 55-μF capacitor has energy ω (t) = 10 cos2 377t J and consider a positive v(t). Determine the current through the capacitor.
    12·1 answer
  • Chemical engineering got is unofficial start around the time of the __________ __________ ________.
    13·1 answer
  • Generic Motors (GM) is making plans for its weekly operation for next year. GM makes three lines of
    13·1 answer
  • In a bicycle race, a bicyclist coasts down a hill with a 7 % grade to save energy. The mass of the bicycle and rider is 80 kg, t
    6·1 answer
  • Question 1 An ice making machine operates on the ideal vapour-compression cycle using refrigerant R134a. The refrigerant enters
    14·1 answer
  • Air enters a constant-area combustion chamber at a pressure of 101 kPa and a temperature of 70°C with a velocity of 130 m/s. By
    8·1 answer
  • 1. (15) A truck scale is made of a platform and four compression force sensors, one at each corner of the platform. The sensor i
    12·1 answer
  • Segment AB is congruent to segment AB.<br><br> This statement shows the ______ property.
    7·1 answer
  • Public transport is a generic term used to describe the family of transit services available to
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!