9. A solid rectangular block of copper 5 cm by 4 cm by 2 cm is drawn out to make a cylindrical wire of diameter 2 mm. Calculate the length of the wire.
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- volume of rectangular block=(5*4*2)cm3
- =40cm3
- diameter of cylindrical wire =2mm
- therefore radius=1mm=1/10cm
- since, volume of rectangular block =volume of cylindrical vessel
- 40cm3 =π×1/10*1/10*h cm3
- 40=π×h/100
- 40=3.14*h/100
- 40=314/10000*h
- h=400000/314
- h=1273.885 cm
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