the mass of a uniform copper bar varies directly as its length.If a bar 40 cm long has a mass of approximately 420 g, find the mass of abar 136 cm long
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40 cm mass approximately 420 g
1 cm = 420 /40
so 136 cm long mass= 420 /40 × 136
=2856g
1 cm = 420 /40
so 136 cm long mass= 420 /40 × 136
=2856g
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