Steel blocks A and B, which have equal masses, are at T A = 300 ∘ C and T B = 400 ∘ C . Block C, with m C = 2 m A is at T C = 350 ∘ C . Blocks A and B are placed in contact, allowed to come

Question

Steel blocks A and B, which have equal masses, are at T A ​ = 300 ∘ C and T B ​ = 400 ∘ C . Block C, with m C ​ = 2 m A ​ is at T C ​ = 350 ∘ C . Blocks A and B are placed in contact, allowed to come to equilibrium and isolated. Then they are placed in contact with block C. After equilibrium is reached,

TestHub · Accepted Answer

Equal masses of the same steel have equal heat capacities.
$T_{A B} = \frac{300 + 400}{2} = 350^{\circ} C$
C is already at $350^{\circ} C$ , so no further heat exchange occurs.
$T_{A} = T_{B} = T_{C} = 350^{\circ} C$
Substitution makes A, C and D true; B is false.

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