Advertisements
Advertisements
Question
Each wheel of a car is of diameter 80 cm. How many completer revolutions does each wheel make in 10 minutes when the car is traveling at a speed of 66 km per hour?
Advertisements
Solution
The car travells in 10 minutes
= `66/6` = 11 km = 1100000 cm
Circumference of the wheel = distance covered by the wheel in one revolution
Thus, we have,
Circumference = 2 x `22/7 xx 80/2` = 251.43 cm
Thus, the number of revolutions covered by the wheel in 1100000 cm = `[ 1100000]/[251.43]` ≈ 4375.
APPEARS IN
RELATED QUESTIONS
In Fig. 4, O is the centre of a circle such that diameter AB = 13 cm and AC = 12 cm. BC is joined. Find the area of the shaded region. (Take π = 3.14)
Shazli took a wire of length 44 cm and bent it into the shape of a circle. Find the radius of that circle. Also find its area. If the same wire is bent into the shape of a square, what will be the length of each of its sides? Which figure encloses more area, the circle or the square? (Take `pi = 22/7`)
In the given figure,
\[\square\] PQRS is a rectangle. If PQ = 14 cm, QR = 21 cm, find the areas of the parts x, y, and z.
The circumference of a circle is 22 cm. Find the area of its quadrant.
In a circle of radius 10.5 cm, the minor arc is one-fifth of the major arc. Find the area of the sector corresponding to the major arc.
The perimeter of a sector of a circle of radius 5.6 cm is 27.2 cm. Find the area of the sector.
Construct an angle PQR = 45°. Mark a point S on QR such that QS = 4.5 cm. Construct a circle to touch PQ at Q and also to pass through S.
Complete the table below.
| Radius (r) | Diameter (d) | Circumference (c) |
| ...... | ...... | 616 cm |
The circumference o a garden roller is 280cm. How many revolutions does it make in moving 490m?
ABCD is a given rectangle with length as 80 cm and breadth as 60 cm. P, Q, R, S are the midpoints of sides AB, BC, CD, DA respectively. A circular rangoli of radius 10 cm is drawn at the centre as shown in the following figure. Find the area of shaded portion.
