2: A copper sphere of diameter 18 cm is drawn
into a wire of diameter 4 mm. Find the length of
the wire.
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voulme remains the same
so
1/3*4*3.14*9*9*9=3.14*0.2*0.2*h
so h=9*9*3*100
h=81*3*100cm
ie. 24300cm
i.e. 243m
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