Question 1008388

 external diameter50.8cm, made of metal 2.54cm thick.

internal diameter = 50.80-2.54*2 = 45.76 cm = 0.4576 m

radius = 0.2288 m

Volume of hemisphere = {{{(2/3) pi * r^3}}}


V = (2/3) *3.142 * (0.2288)^3
= 0.025 m^3

mass = d*v

mass = 0.025 * 31.75

=0.8255 kg

= 825.50 gms