A hollow spherical met allic ball has an exter nal diameter 6 cm and is 1/2c m thic k.
The volume of met al(in cm
) used in the ball is :
3
(a) 37 (b) 40 (c) 41 (d) 47

• thickness of ball is 1/2 cm means internal radius=3-0.5=2.5 cm
  the volume of ball is =total volume-internal volume
  =4/3*(pi)*(3^3)-4/3*(pi)*(2.5^3)
  =4/3*(pi)*(3^3-2.5^3)
  =4/3*(pi)*(27-15.625)
  =4/3*(22/7)*(11.735)
  =4/3*(22)*(1.625)
  =143/3=47.6
  so approximately the value is (d)....
  
  
• 12 years agoHelpfull: Yes(14) No(0)