Fig. 15.87, shows the cross-section of railway tunnel. The radius `O A` of the circular part is 2 m. If `/_A O B=90o` , calculate: (i) the height of the tunnel (ii) the perimeter of the cross-section (iii) the area of the cross-section.

The cross-section of a tunnel is a square of side 7 m surmounted by a semicircle. The tunnel is 80 m long Calculate : the surface area of the tunnel (excluding the floor) .

The cross-section of a tunnel is a square of side 7 m surmounted by a semicircle. The tunnel is 80 m long ,Calculate : its volume

The cross-section of a railway tunnel is a square surmounted by a semi-circle as shown in the figure. The tunnel is 50 m long. Find the cost of plastering the internal surface of the tunnel (excluding the floor) at the rate of Rs 10 per m^(2).

Find the curved surface area and the total surface area of a right circular cyclinder whose height is 15 cm and the diameter of the cross- sections is 14 cm

A uniform current I is flowing in a long wire of radius R . If the current is uniformly distributed across the cross-sectional area of the wire, then

A uniform current I is flowing in a long wire of radius R . If the current is uniformly distributed across the cross-sectional area of the wire, then