Homework Answers
Part A) The law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another.
Hence option 1 is correct.
Part B)
Heat absorbed by the system = q+ (positive)
Heat evolved by the system = q− (negative)
Work done on the system = w+ (positive)
Work done by the system = w− (negative)
Hence both q & w will be +
Option 3 is correct.
Part C)
Since the two material have same Mass but the specific heat capacity of silver metal is much smaller than that of copper metal so the final temperature of two metal will be closer to 343 K than to 453 K.
Option 4 is self explanatory for the reason so option 4 is correct.
Part D)
Q = m×s×∆t
Q= 6×4.18×(36.5-15)
Q=6×4.18×21.5
Q=539.2
Q=539 J
Hence option 4 is correct.
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