Question Detail

PHY 101 PHY 101 Past Questions Objective Question
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Question

How much heat input is needed to raise the temperature of a 20 kg iron vat filled with 3 kg of water from 10°C to 90°C? (c_iron = 450 J/kg°C, c_water = 4186 J/kg°C)
Options
A 1.72 MJ
Correct Answer
B 1.72 kJ
C 1.72 J
D 1.72 mJ
Correct Answer

Option A is the correct answer.

Detailed Explanation

Total heat = m₁c₁ΔT + m₂c₂ΔT = (20×450×80) + (3×4186×80) ≈ 1.72×10⁶ J = 1.72 MJ.

Hint

Heat gained by container + heat gained by water.

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 294 of 1250
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