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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 vat made of iron and filled with 3 kg of water from 10°C to 90°C? Take the specific heat of iron as 450 J/kg·°C and water as 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 Q = (m_iron * c_iron + m_water * c_water) * ΔT ≈ 1.72 × 10^6 J = 1.72 MJ.

Hint

Use Q = mcΔT for both iron and water, then sum.

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 194 of 1250
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