Physics, 20.09.2019 15:30 tadopson2003

Aroom is heated as a result of solar radiation coming in through the windows. is this a heat or work interaction for the room?

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The situation where a room is heated as a result of solar radiation coming in through the windows is a heat interaction since it is due to the temperature difference between the sun and the room that caused the heat.

By a virtue of a temperature difference due to thermal interactions, energy in the form of heat is transferred between a subsystem and its surroundings. Mass flow are the main participants of thermal interactions. However, this conversation about thermal interactions is confined to close subsystems only, i.e. zero mass flow subsystems opposite their boundary.

Radiation and conduction are the two difference ways where heat can be transferred thru a subsystem boundary.

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Rain is pulled by gravity which is a non contact force

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force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Aroom is heated as a result of solar radiation coming in through the windows. is this a heat or work...

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