The external curved surface area of a metallic hemispherical bowl is 308 cm2 . If the density of metal is 8.7 gm per cm3 , then the mass of the bowl is equal to: ()
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 6252.4 gm.
Curved surface area = 2πr² = 308
→ 2 × 22/7 × r² = 308
→ r² = 49 → r = 7 cm
Volume = (2/3)πr³ = (2/3) × 22/7 × 343 = 718.67 cm³
Mass = 718.67 × 8.7 = 6252.4 gm