CBSE Class 11-science Answered
(i) Yes. the internal energy increases. No. the heat does not enter the piece of iron from outside.
(ii) Yes. the increase in the internal energy is due to the transfer of heat and not due to any work.
(iii) Since the speed of the car is not increasing, the gravitational potential energy is converted into internal energy of the system (brake-drums) which gets heated.
(iv) The rise in temperature will be same for both the balls.
(v) Because the internal energy of an ideal gas depends only temperature, the internal energy remains the same.
(vi) The internal energy of an ideal gas can altered by compressing or by adiabatic expansion.
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