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3 years ago

What is the definition of Heat Transfer

Physics

2 answers:

dlinn [17]3 years ago

7 0

Answer:

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.

Explanation:

hope that helps

Evgen [1.6K]3 years ago

5 0

Answer:

Heat transfer is an engineering discipline that concerns the generation, use, conversion, and exchange of heat (thermal energy) between physical systems.

Explanation:

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A fillet weld has a cross-sectional area of 25.0 mm2and is 300 mm long. (a) What quantity of heat (in joules) is required to acc

HACTEHA [7]

Answer:

77362.56 J

163730.28571 J

Explanation:

A = Area = 25 mm²

l = Length = 300 mm

K = Constant = $3.33\times 10^{-6}$

$\eta$ = Heat transfer factor = 0.75

$f_m$ = Melting factor = 0.63

T = Melting point of low carbon steel = 1760 K

Volume of the fillet would be

$V=Al\\\Rightarrow V=25\times 300\\\Rightarrow V=7500\ mm^3=7500\times 10^{-9}\ m^3$

The unit energy for melting is given by

$U_m=KT^2\\\Rightarrow U_m=3.33\times 10^{-6}\times 1760^2\\\Rightarrow U_m=10.315008\ J/mm^3$

Heat would be

$Q=U_mV\\\Rightarrow Q=10.315008\times 7500\\\Rightarrow Q=77362.56\ J$

Heat required to weld is 77362.56 J

Amount of heat generation is given by

$Q_g=\dfrac{Q}{\eta f_m}\\\Rightarrow Q_g=\dfrac{77362.56}{0.75\times 0.63}\\\Rightarrow Q_g=163730.28571\ J$

The heat generated at the welding source is 163730.28571 J

7 0

4 years ago

A 60kg student is sitting in a chair and is not moving. what is the force of a student acting on the chair? what is the force of

vazorg [7]

The force with which the student is acting in the chair and the force of the chair acting on the student is 588 N

Explanation:

There are two kinds of forces acting on you when you are sitting on the chair, they are the gravitational force and the force exerted by the chair on you.
The forces acting on the chair when you are sitting are the gravitational force and the force exerted by you.
As per Newton's third law of motion, for every action, there is an equal and opposite reaction.
Hence, F = ma

that is, F = 60 * 9.8

=588 N

So, 588 N force should be applied from both sides then only you can sit properly in the chair.

7 0

3 years ago

What are conducting patterns?

Arturiano [62]

Answer:

A conducting pattern is a pattern in which your dominant hand follows in order to establish beats and tempo to the choir. Conductors that are directing large orchestras and choirs will often times use a baton so that the entire group can clearly see the motions.

Explanation:

4 0

3 years ago

What is meant by a 'closed system'?

vovangra [49]

Answer:

Image result for What is meant by a 'closed system'?

A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy

Explanation:

7 0

3 years ago

Read 2 more answers

Globalisasi sebagai proses relasi antara lokal dan global telah memberi kemudahan bagi kita untuk mengenal kebudayaan lain di lu

ra1l [238]

Answer:

B. Together in harmony

Explanation:

Globalization is the most potent way to fosters peace and harmony between nations.

The process in which companies develops strategies in order to make them operate in the international scene. It involves participation between two or more countries.

This strategy makes it possible for different people to coalesce and develop strategies to promote cross-country trade.

Trading is one of the ways of improving human-human and nation-nation relationships.

5 0

4 years ago