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A metal rod of density 7000 kgm-3 and cross-sec... - WAEC Physics 2011 Question

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
correct option: a

P = (\frac{M}{AL})

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

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

= 0.2m

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