Waec Model Questions Vol1 2023 Physics Question 8

Practice essay / theory question 8 from the 2023 Waec Model Questions Vol1 Physics examination. This question covers Heat .

Waec Model Questions Vol1 2023 Physics Essay / Theory
Topic: Heat
Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • PHYSICS • essay

A 0.5 kg block of copper (specific heat capacity c₍Cu₎ = 385 J·kg⁻¹·K⁻¹) at 150 °C is placed into a well‑insulated calorimeter containing 1.2 kg of water (c₍w₎ = 4186 J·kg⁻¹·K⁻¹) initially at 25 °C. After thermal equilibrium is reached, the temperature of the combined system is recorded as 30 °C.

Question Parts

( a )
Using the principle of conservation of energy, verify whether the measured final temperature of 30 °C is consistent with the data given.
( b )
Assuming no heat loss to the surroundings, calculate the theoretical final temperature of the system.
( c )
Determine the percentage of the copper block’s initial thermal energy (relative to 0 °C) that is transferred to the water when the final temperature is the measured 30 °C.
( d )
If the calorimeter itself has a heat capacity of 150 J·K⁻¹, recompute the expected final temperature taking the calorimeter into account.
( e )
Discuss two possible sources of experimental error that could cause the observed temperature to be lower than the theoretical value obtained in part (b).

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About This Question

This is Waec Model Questions Vol1 2023 Physics Question 8. It is one of the essay questions from the 2023 Waec Model Questions Vol1 Physics examination.

The question covers Heat .

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