What statements are true about work and heat? (i) Work done on a system is negative. (ii) Work done by a system is negative. (iii) Positive heat is when energy is transferred into the system from the thermal reservoir. (iv) Negative heat is when energy is transferred into the system from the thermal reservoir. (v) Energy may be transferred into or out of a system as either work W or heat Q (a)( (i) & (iii) only (b) (ii) & (Iii) only (c) (i), (iii) & (v) only (d) (ii), (iv) & (v) only
Question
What statements are true about work and heat? (i) Work done on a system is negative. (ii) Work done by a system is negative. (iii) Positive heat is when energy is transferred into the system from the thermal reservoir. (iv) Negative heat is when energy is transferred into the system from the thermal reservoir. (v) Energy may be transferred into or out of a system as either work W or heat Q (a)( (i) & (iii) only (b) (ii) & (Iii) only (c) (i), (iii) & (v) only (d) (ii), (iv) & (v) only
Solution
The correct answer is (c) (i), (iii) & (v) only.
Here's why:
(i) Work done on a system is negative. This is true. In thermodynamics, work done on a system is considered negative because energy is being transferred from the surroundings to the system.
(ii) Work done by a system is negative. This is false. Work done by a system is considered positive because energy is being transferred from the system to the surroundings.
(iii) Positive heat is when energy is transferred into the system from the thermal reservoir. This is true. Positive heat signifies that the system is gaining heat or energy from its surroundings.
(iv) Negative heat is when energy is transferred into the system from the thermal reservoir. This is false. Negative heat signifies that the system is losing heat or energy to its surroundings.
(v) Energy may be transferred into or out of a system as either work W or heat Q. This is true. In thermodynamics, energy can be transferred in two ways: as work or as heat.
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