Question

an iron piller have the combination of cone and cylinder. height and diameter of cylindrical part is 2.8m and 20cm respectively the height of cone is 42 cm. find the weight of piller if 1 cube cm is equal to 7.5 grams

Answer 1

HEIGHT OF CYLINDRICAL PART = 20m
Diameter = 2.8m
RADIUS = 1.4m
Volume of CYLINDRICAL PART = πr²h
= 22/7×1.4×1.4×20= 123.2cm³
Height of Conical part of pillar = 42m
Radius = 1.4m
Volume of Conical part= 1/3πr²h = 1/3×22/7×1.4×1.4×42 = 1811.04/21=86.24m³
Total volume of pillar = Volume of CYLINDRICAL PART+ Volume of Conical part = 123.2+86.24 = 209.44m³
Weight of iron pillar of 1³ = 7.5h
THEREFORE,
WEIGHT OF IRON PILLAR OF 209.44M³ = 7.5×209.44= 1570.8G