A hemisphere is made of a sheet of a metal 1 cm thick. If the outer radius is 5 cm, what is the weight of the hemisphere (1 cm⊃3; of the metal weigh 9 g)?
Answer: B
Thickness the sheet of metal = 1 cm
Volume of sheet = 2/3π(5)⊃3; - 2/3π(4)⊃3;
= 122π/3
Weight of the hemisphere = (122π*9)/3
= 366π