Question

The height and radius of a cylinder are 3 and 1.5cm respectively .Find the surface area of the cylinder​

Answer 1

Surface Area Of Cylinder is 42.39 cm

Step-by-step explanation:

GIVEN

Height = 3

Radius = 1.5 cm

π = 3.14

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Formulas Of Cylinder

$Total \: Surface \: Area \: of \: Cylinder = 2 \times pi\times r \: (r + h)$

$Volume \: of \: a \: Cylinder = \ pi \times {r}^{2} \times h$

$Surface \: Area \: of \: Cylinder = 2 \times pi \times rh + 2 \times pi \times {r}^{2}$

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We know that,

$Surface \: Area \: of \: Cylinder = 2 \times pi \times rh + 2 \times pi \times {r}^{2}$

$Surface \: Area \: of \: Cylinder = 2 \times 3.14 \times 1.5 \times 3 + 2 \times 3.14 \times {1.5}^{2}$

$Surface \: Area \: of \: Cylinder = 6.28 \times 1.5 \times 3 + 6.28 \times 2.25$

$Surface \: Area \: of \: Cylinder = 6.28 \times 4.5 + 14.13$

$Surface \: Area \: of \: Cylinder = 28.26 + 14.13$

$Surface \: Area \: of \: Cylinder = 42.39$

$\underline{\boxed{\bf{Surface \: Area \: of \: Cylinder = 42.39 \: cm}}}$

Surface Area Of Cylinder is 42.39 cm

Answer 2

Answer:

Step-by-step explanation:

Load must be   th. of the origional load.

Given:

A steel wire can support a maximum load of W reaching its elastic limit.

To find:

How much load can another wire made out of identical steel, but with a radius one half the radius of the first wire.

Formula used:

Stess = 

Area of wire =  × (Radius)²

Explanation:

Eatch wire are made up of steel So Stress at elastic point must be same.

Stess for first wire =  =  

Stess for second wire =  

So,

            =  

                 = 

Load must be   th. of the origional load.

To learn more...

1)State hooke's law define elastic limit and modulus of elasticity.