waec model questions vol1 2021 physics
Objective • Question 16
Question 16
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A 150 g block of an unknown metal at 120 °C is placed into 200 g of water at 25 °C in an insulated container. The system reaches a final equilibrium temperature of 30 °C. During the process the metal oxidises, losing 5 % of its mass; each gram of metal lost releases 10 J of heat. Assuming no heat loss to the surroundings, determine the specific heat capacity of the metal in J kg⁻¹ K⁻¹.
Answer Options
A.
3.05×10^3
B.
2.95×10^2
C.
3.15×10^2
Correct Answer
D.
3.05×10^2
Correct Answer
D
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