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.

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

In Fig. the circular cross-section of tunnel is shown. A 100 W almp is lighted at the heighest point S. The diameter of the tunnel is 2m. Compare the illuminance at the lowest point P and the point Q of the tunnel.

If cross- sectional area of limb I is A_(1) and that of limb II is A_(2) then velocity of the liquid in the tube will be, (cross- sectional area of tube is very small)

The cross-section of a railway tunnel is a rectangle 6 m broad and 8 m high, surrounded by a semi-circle as shown in the adjoining figure. The tunnel is 35 m long. What is the cost of plastering the internal surface of the tunnel excluding the floor at the rate of Rs. 3 per m^(2) ?

I-V characterstic of a copper wire of length L and area fo cross-section A is shown in Fig. The slope of the curve becomes

The shape of the cross section of a canal is a trapezium. If the canal is 10 m wide at the top, 6 m wide at the bottom and the area of its cross section is 640 m^(2) , find the depth of the canal.

The shape of the cross section of a canal is a trapezium . If the canal is 10 m wide at the top , 6 m wide at the bottom and the area of its cross section is 640 m^(2), find the depth of the canal .

Fig. shows the transverse circular section of a tunnel. At the highest point S, a 100 W lamp is lighted. The diameter of the tunnel is 4m. Compare the intensities of illumination at the lowest point P of the tunnel and at a point Q on the wall making an angle of depression of 60^(@) at the bulb.