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A Rocket is in the Form of a Circular Cylinder Closed at the Lower End with a Cone of the Same Radius Attached to the Top. the Cylinder is of Radius 2.5m and Height 21m and the Cone Has a Slant Height 8m. Calculate Total Surface Area and Volume of the Rocket? - CBSE Class 10 - Mathematics

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Question

A rocket is in the form of a circular cylinder closed at the lower end with a cone of the same radius attached to the top. The cylinder is of radius 2.5m and height 21m and the cone has a slant height 8m. Calculate total surface area and volume of the rocket?

Solution

Given radius of cylinder (a) = 2.5m

Height of cylinder (h) = 21m

Slant height of cylinder (l) = 8m

Curved surface area of cone(S1) = πrl

S1 = π(2.5)(8)cm2            ...........(1)

Curbed surface area of a cone= 2pirh+pir^2

S_2=2pi(2.5)(21)+pi(2.5)^2cm^2         ...........(2)

∴Total curved surface area = (1) + (2)

S = S1 + S2

S = π(2.5)(8) + 2π(2.5)(21) + π(2.5)2

S = 62.831 + 329.86 + 19.63

S = 412.3m2

∴Total curved surface area = 412.3m2

Volume of a cone =1/3pir^2h

V_1=1/3xxpi(2.5)^2h cm^3      .........(3)

Let ‘h’ be height of cone

l^2=r^2+h^2

⇒ l^2-r^2=h^2

⇒ h=sqrt(l^2-r^2)

⇒ h=sqrt(8^2-25^2)

⇒ h =23.685m

Subtracting ‘h’ value in(3)

Volume of a cone (V_1)=1/3xxpi(2.5)^2(23.685)  cm^2      ........(4)

Volume of a cylinder (V_2)=pir^2h

=pi(2.5)^2 21m^3           ...........(5)

Total volume = (4) + (5)

V = V1 + V2

⇒ V=1/3xxpi(2.5)^2(23.685)+pi(2.5)^2=1

⇒ V = 461.84m2

Total volume (V) = 461.84m2

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RD Sharma Solution for 10 Mathematics (2018 to Current)
Chapter 14: Surface Areas and Volumes
Ex. 14.20 | Q: 2 | Page no. 60

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Solution A Rocket is in the Form of a Circular Cylinder Closed at the Lower End with a Cone of the Same Radius Attached to the Top. the Cylinder is of Radius 2.5m and Height 21m and the Cone Has a Slant Height 8m. Calculate Total Surface Area and Volume of the Rocket? Concept: Surface Areas and Volumes Examples and Solutions.
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