A hollow spherical shell is made of a metal of density 4.9 gm/cm3. If its internal and external diameters are 10 cm and 12 cm respectively, find the weight of the shell.

• density=mass/volume
  volume of hollow spherical=4pi/3(R^3-r^3)
  so v*d=4.9*4pi/3(6^3-5^3)=4pi/3(216-125)=4.9*4pi/3(91)=4.9*4*22*13/3=1868.5
  
  
  
• 10 years agoHelpfull: Yes(30) No(0)
• density=mass/volume
  so mass=volume*density
  volume of hollow spherical=4pi/3(R^3-r^3)
  so v=4pi/3(6^3-5^3)=4pi/3(216-125)=4pi/3(91)=4*22*13/3=88*13/3
  now mass=v*D=88*13*4.9/3=1830.4 gm i think
• 10 years agoHelpfull: Yes(11) No(8)
• mass is diff from weight.In weight ,gravitationalforce acts and weight=mass*g
• 9 years agoHelpfull: Yes(6) No(1)
• Weight= volume * density
  Volume of hollow sphere= 4 pi/3(R^3-r^3) * 4.9
  = 5605.6/3= 1868.5 gm
• 10 years agoHelpfull: Yes(1) No(1)