WAEC Physics 2015 Objective — Question 42
Question 42 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.
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The mass of the earth is 6.0×10²⁴ kg and that of the moon is 7.0×10²² kg. If the distance between them is 4.0×10⁸ m, calculate the force of attraction between them. [G = 6.7×10⁻¹¹ Nm²kg⁻²]
- A. 1.8×10¹² N
- B. 1.8×10¹⁵ N
- C. 1.8×10¹⁸ N
- D. 1.8×10²⁰ NCorrect
Explanation
F = GMm/r² = (6.7×10⁻¹¹×6×10²⁴×7×10²²)/(4×10⁸)² ≈ 1.8×10²⁰ N.
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