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CBSE Class 10 Answered

the inner diameter of a cylindrical glass is 5cm but the bottom of the glass is raised portion reduces the capacity of the glass. if the height of the glass is 10cm, find the apparent capacity of the glass and the actual capacity of the glass.
Asked by | 30 Jan, 2012, 08:44: PM
Expert Answer
Since the inner diameter of the glass = 5 cm and height = 10 cm, the apparent capacity of the glass = ?r2 h = 3.14 × 2.5 × 2.5 × 10 cm3 = 196.25 cm3 But the actual capacity of the glass is less by the volume of the hemisphere at the base of the glass. i.e., it is less by 2/3 ?r3 = 2 x 3.14 x 2.5 x 2.5 x 2.5 cm3 = 32.71 cm3 So, the actual capacity of the glass = apparent capacity of glass – volume of the Hemi-sphere = (196.25 – 32.71) cm3 = 163.54 cm2
Answered by | 31 Jan, 2012, 10:04: AM
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