Q2 of 36 Page 253

A man is cycling in such a way that the wheels of the cycle are making 140 revolutions per minute. If the diameter of the wheel is 60 cm, then how much distance will he cover in 2 hours?

Speed of the cycle = 140RPM


Diameter of the wheel = 60 cm


No. of revolution in 2 hours = 120 × 140


= 16,800


Distance covered in 2 hours = Revolutions × Diameter


= 16,800 × 60


= 1008000 cm


= 10080 m


= 10.8 km


More from this chapter

All 36 →
5

and are two mutually perpendicular radii of a circle of radius 10.5 cm. D and OD = 6 cm. Find the area of blue coloured region shown in figure 13.23.


Figure 13.23


 1

The area of a circular park is 616 m2. There is a 3.5 m wide track around the park running parallel to the boundary. Calculate the cost of fencing on the outer circle at the rate of Rs. 5 per meter.

 3

If a chord of (O, 20) subtends right angle at O, find the area of the minor segment.

 4

There are two arcs of (O, OA) and of (M, MA) as shown in figure 13.24. Find the area enclosed by two arcs.


Figure 13.24