Question

A a cylindrical drum which is open at the top has a diameter of 140 cm and height 1.2 metre find the cost of electroplating disturb on the inside @ rupees 7.50 per metre square

Answer 1

Answer:

Anabvwvvabbannajakkzzjzj BABZBBZ zbns sat down sb ab bs Bznzhz

Step-by-step explanation:

Bsbsbsbsvbsbmzkz Zbzbnsnxn zbns NZB Sbbznzj

Answer 2

Therefore cost of electroplating disturb on the inside of the cylindrical drum is =Rs. 51.15

Step-by-step explanation:

Given that, a cylindrical drum which is open at the top and the diameter of the cylinder is 140 cm.

$Radius =\frac{diameter}{2} =\frac{140}{2} cm = 70 \ cm$ = 0.7 m

The height of the cylinder is = 1.2 m

The curve surface area of a cylinder is = $2\pi r h$

The surface area of the base of a cylinder is = $\pi r^2$

Therefore the surface area = $(2\pi rh+\pi r^2)$

                                          $=(2\pi \times 0.7\times 1.2+\pi 0.7^2) m^2$

                                           =6.82 m²

The cost of electroplating disturb is Rs 7.50 per meter square.

It means the cost of 1 mete square of electroplating disturb is Rs 7.50.

Therefore cost of electroplating disturb on the inside of the cylindrical drum is =Rs.(6.82× 7.50)=Rs. 51.15