Q17) Two identical copper blocks of mass m=1.5 kg, block L at temperature Ta = 60 °C and block R at temperature TiR-20° C. The blocks are in a thermally insulated box and are separated by an insulating shutter. When we lift the shutter, the blocks eventually come to the equilibrium temperature T-40°C. The net entropy change (in J/K) of the two-block system during this irreversible process is: (The specific heat of copper is 386 J/kg. K) a) 0 b)-74.1 c) -2.4 d) +74.1 e) +2.4 Q18) How much energy (in 10 J) must be transferred as heat for a reversible isothermal expansion of an ideal gas at 132°C if the entropy of the gas increases by 46.0 J/K? a) 1.86 b)-1.86 c) 7.21 d) -7.21 e) 2.67

Q17) Two identical copper blocks of mass m=1.5 kg, block L at temperature Ta = 60 °C and block R at temperature TiR-20° C. The blocks are in a thermally insulated box and are separated by an insulating shutter. When we lift the shutter, the blocks eventually come to the equilibrium temperature T-40°C. The net entropy change (in J/K) of the two-block system during this irreversible process is: (The specific heat of copper is 386 J/kg. K) a) 0 b)-74.1 c) -2.4 d) +74.1 e) +2.4 Q18) How much energy (in 10 J) must be transferred as heat for a reversible isothermal expansion of an ideal gas at 132°C if the entropy of the gas increases by 46.0 J/K? a) 1.86 b)-1.86 c) 7.21 d) -7.21 e) 2.67

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Q17) Two identical copper blocks of mass m =1.5 kg, block L. at temperature Ta
= 60 °C and block R at temperature TiR-20° C. The blocks are in a thermally
insulated box and are separated by an insulating shutter. When we lift the shutter,
the blocks eventually come to the equilibrium temperature T-40°C. The net
entropy change (in J/K) of the two-block system during this irreversible process is:
(The specific heat of copper is 386 J/kg. K)
a) 0
b)-74.1
c) -2.4
d) +74.1 e) +2.4
Q18) How much energy (in 10 J) must be transferred as heat for a reversible
isothermal expansion of an ideal gas at 132°C if the entropy of the gas increases by
46.0 J/K?
a) 1.86
b)-1.86
c) 7.21
d) -7.21
e) 2.67

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