Advertisements
Advertisements
प्रश्न
A wheel of a car covers a distance of 3520 cm in 20 rotations. Find the radius of the wheel?
Advertisements
उत्तर
Distance covered by circular wheel in 20 rotation = 3520 cm
∴ Distance covered in rotation = `3520/20 "cm"` = 176 cm
∴ Circumference of the wheel = 176 cm
∴ 2πr = 176
`2 xx (-2)/6 xx "r"` = 176
r = `(176 xx 7)/(2 xx 22)`
r = 28 cm
Radius of the wheel = 28 cm
APPEARS IN
संबंधित प्रश्न
In Fig. 9, is shown a sector OAP of a circle with centre O, containing ∠θ. AB is perpendicular to the radius OQ and meets OP produced at B. Prove that the perimeter of shaded region is
`r[tantheta+sectheta+(pitheta)/180-1]`
The short and long hands of a clock are 4 cm and 6 cm long respectively. Find the sum of distances travelled by their tips in 2 days. (Take π = 22/7)
The radius of a sector of a circle is 7 cm. If the measure of the arc of the sector is 210°, find the area of the sector in case.
Choose the correct alternative answer for the following question.
The radius of the wheel of a vehicle is 42 cm. How many revolutions will it complete in a 19.8-km-long journey?
A canvas tent is in the shape of a cylinder surmounted by a conical roof. The common diameter of the cone and the cylinder is 14 m. The height of the cylindrical part is 8 m and the height of the conical roof is 4 m. Find the area of the canvas used to make the tent.
A cart wheel makes 9 revolutions per second. If the diameter of the wheel is 42 cm, find its speed in km/hr.
Find the perimeter of the given shape (Take π = `22/7`).
Formula used to find the circumference of a circle is
Area of circular garden with diameter 8 m is ______.
