Question

a solid is composed of cylinder with hemispherical ends . if the whole length of the solid is 100cm and the diameter of the hemispherical ends
is 28 cm . find the volume of the solid .(hint :- h of cylinder = 100-14-14 =72 cm )​

Answer 1

In the given solid height of cylinder = 100 - 2{radius of hemisphere} = 100 - 28 = 72

CSA of the solid = CSA of cylinder + CSA of both hemispheres

= 2*22/7*14*72 + 2 { 2*22/7*14*14 }

= 8800cm2

Cost = 8800 * .05 = Rs 440

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Answer 2

Step-by-step explanation:

radius of the cylinder =r

1

=18cm

height of the cylinder h=72cm

total surface area

= curved surface are of the cylinder + surface areas of hemispherical ends

=(2πrh+2×2πr

2

)cm

2

=(2πrh+4πr

2

)cm

2

=2πr(h+2r)cm

2

=2×

7

22

×18×(72+36)cm

2

=12219.42cm

2

Rate of polishing 7 paise per sq.cm

Cost of polishing =Rs.(12219.42×

100

7

=Rs.855.36Rs