Advertisements
Advertisements
Question
The radius of a wheel is 0.25 m. How many revolutions will it make in covering 11 km?
Options
2800
4000
5500
7000
Solution
7000
Distance covered in 1 revolution = 2πr
`=(2xx22/7xx0.25)"m"`
`=(2xx22/7xx25/100)"m"`
`= 11/7 "m"`
Number of revolutions taken to cover 11 km`=(11xx1000xx7/11)`
= 7000
APPEARS IN
RELATED QUESTIONS
In the given figure, ΔABC is an equilateral triangle the length of whose side is equal to 10 cm, and ΔADC is right-angled at D and BD= 8cm. Find the area of the shaded region.
The dimensions of a room are 14 m x 10 m x 6.5 m There are two doors and 4 windows in the room. Each door measures 2.5 m x 1.2 m and each window measures 1.5 m x 1 m. Find the cost of painting the four walls of the room at ₹ `35perm^2` .
Find the area and perimeter of a square plot of land whose diagonal is 24 m long.
From each of the two opposite corners of a square of side 8 cm, a quadrant of a circle of radius 1.4 cm is cut. Another circle of radius 4.2 cm is also cut from the centre as shown in the following figure. Find the area of the remaining (Shaded) portion of the square. (Use π = 22/7)
In the following figure, O is the centre of a circular arc and AOB is a straight line. Find the perimeter and the area of the shaded region correct to one decimal place. (Take π = 3.142)
In the following figure, ABCD is a trapezium of area 24.5 cm2 , If AD || BC, ∠DAB = 90°, AD = 10 cm, BC = 4 cm and ABE is quadrant of a circle, then find the area of the shaded region. [CBSE 2014]
If a square is inscribed in a circle, what is the ratio of the areas of the circle and the square?
If the area of a sector of a circle is `5/18` of the area of the circle, then the sector angle is equal to
A wire is bent to form a square enclosing an area of 484 cm2. Using the same wire, a circle is formed. Find the area of the circle.
The area of the circle whose diameter is 21 cm is ____________.
