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A metal rod of density 7000 kgm-3 and cross-sectional area of 0.001257m2 has a mass...

Physics
WAEC 2011
A metal rod of density 7000 kgm-3 and cross-sectional area of 0.001257m2 has a mass of 1.76kg. Calculate its length.
  • A. 0.20m
  • B. 0.25m
  • C. 0.40m
  • D. 0.50m
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Correct Answer: Option A
Explanation
P = \(\frac{M}{AL}\)

L = \(\frac{M}{CA}\)

= \(\frac{1.76}{7000 \times 0.001257}\)

= 0.2m
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