Question Detail

PHY 101 PHY 101 Past Questions Objective Question
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Question

Calculate the rate of heat flow through a glass window (2.25 m x 1.75 m, thickness 3.5 mm) with outer and inner surface temperatures of 29.0°C and 26.0°C. Conductivity of glass is 0.84 J/(m·s·°C).
Options
A 2.8 kJ/s
Correct Answer
B 28 kJ/s
C 280 kJ/s
D 2800 kJ/s
Correct Answer

Option A is the correct answer.

Detailed Explanation

Area A = 3.9375 m², ΔT = 3°C, thickness d = 0.0035 m. Q/t = kAΔT/d = 0.84 × 3.9375 × (3/0.0035) ≈ 2835 J/s = 2.8 kJ/s.

Hint

Use Fourier’s law: Q/t = kAΔT/d.

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 136 of 1250
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