Question

The radius of a solid metal cylinder is 10.5 cm and height is 60 cm. calculate the mass of cylinder if the density of metal of cylinder is 5 gm per cm3.

Answer 1

Radius of the base of the cylinder, r= 10.5 cm
Height of the cylinder, h = 60 cm
Volume of the metal cylinder  = πr²h
                                               = 22/7 x (10.5)² x 60
                                               = 20790 cm³
 Density of the metal cylinder= 5g/cm³
 mass of metal cylinder = Volume x Density
                                      = 20790x5
                                      = 103950g
                                      =103.95kg

Answer 2

Volume of cylinder = πr²h
                              = (22/7)×(10.5)²×60 
                             = 20790 cm³
now, density = mass/volume
⇒mass = density ×volume 
            =5×20790 = 103960 gm
            = 103.96 kg