The inner circumference of a circular track is `220` m. The track is `7` m everywhere. Calculate the cost of putting a fence along the outer boundary at rupees `20`per metre.

An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?

The inside perimeter of a running track shown in the figure is 400m . The length of each of the straight portion is 90m and the ends are semi-circles. If the track is 14m wide everywhere, find the length of outer boundary of the track. ( pi=22/7 )

The inside perimeter of a running track as shown in the adjoining figure is 340m . The length of each straight portion is 60m and the curved portion are semi-circles. If the track is 7m wide, find the outer perimeter of the track. (Use pi=22/7 )

A train runs along an unbanked circular track of radius 30 m at a speed of 54 km/h. The mass of the train is 106 kg. What provides the centripetal force required for this purpose - The engine or the rails? What is the angle of banking required to prevent- wearing out of the rail?

In Fig12.26 depicts a racing track whose left and right ends are semicircular.The distance between the two inner parallel line segments is 60 and they are each 106 m long.If the track is 10 m wide,find:(i)the distance around the track along its inner edge

How many cubic meters of soil shall be taken out while digging a well of depth of 22.5m and diameter 7m.?Also find the total cost of cementing the curved surface inside the well at the cost of Rs.20 per square metre.