WAEC Physics 2012 Objective — Question 2
Question 2 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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The density of a spherical ball of diameter d and mass m is given by
- A. A. ρ = 3m/(4πd³)
- B. B. ρ = 4πmd³
- C. C. ρ = 6m/(πd³)Correct
- D. D. ρ = 3m/(πdm³)
Explanation
Density = mass/volume. Volume of a sphere = (4/3)πr³ where r = d/2, so V = πd³/6. Therefore ρ = m / (πd³/6) = 6m/(πd³).
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