Advertisements
Advertisements
प्रश्न
When we rub our hands they become warm. Have we supplied heat to the hands?
Advertisements
उत्तर
When we rub our hands, they become warm. In this process, heat is supplied to the hands due to the friction between the hands.
APPEARS IN
संबंधित प्रश्न
Explain why Air pressure in a car tyre increases during driving.
A steam engine delivers 5.4×108 J of work per minute and services 3.6 × 109 J of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?
Should the internal energy of a system necessarily increase if its temperature is increased?
The outer surface of a cylinder containing a gas is rubbed vigorously by a polishing machine. The cylinder and its gas become warm. Is the energy transferred to the gas heat or work?
When a tyre bursts, the air coming out is cooler than the surrounding air. Explain.
Consider the process on a system shown in figure. During the process, the work done by the system ______________ .
Consider the following two statements.
(A) If heat is added to a system, its temperature must increase.
(B) If positive work is done by a system in a thermodynamic process, its volume must increase.
A system releases 130 kJ of heat while 109 kJ of work is done on the system. Calculate the change in internal energy.
Which of the following system freely allows the exchange of energy and matter with its environment?
What is the energy associated with the random, disordered motion of the molecules of a system called as?
Explain the different ways through which the internal energy of the system can be changed.
An ideal gas is compressed at a constant temperature. Its internal energy will ____________.
8 m3 of a gas is heated at the pressure 105 N/m2 until its volume increases by 10%. Then, the external work done by the gas is ____________.
Which of the following represents isothermal process?
In insulated systems, the amount of external work done by the gas is proportional to:
In thermodynamics, heat and work are ______.
An expansion process on a diatomic ideal gas (Cv = 5/2 R), has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.08 m3 and the temperature is 390 K. The final pressure is 90 kPa and the final temperature s 320 K. The change in the internal energy of the gas, in SI units, is closest to:
The molar specific heat of He at constant volume is 12.47 J/mol.K. Two moles of He are heated at constant pressure. So the rise in temperature is 10 K. Find the increase in internal energy of the gas.
Explain the change in internal energy of a thermodynamic system (the gas) by heating it.
