Advertisements
Advertisements
प्रश्न
The diameter of a wheel is 1.4m. How many revolutions does make in moving a distance of 2.2km?
Advertisements
उत्तर
The Circumference of a Circle with diameter d is πd
The Circumference of a Circle with diameter 1.4m is π x 1.4
= `(22)/(7) xx 1.4`
= 22 x 0.2
= 4.4m
Total distance moved
= 2.2km
= 2.2 x 1000m
= 2200m
Number of revolutions
= `"Total distance moved"/"Circumference of Circle"`
= `(2200)/(4.4)`
= 500.
APPEARS IN
संबंधित प्रश्न
The length of minute hand of a clock is 14 cm. Find the area swept by the minute hand in one minute. (Use π = 22/7)
Three semicircles each of diameter 3 cm, a circle of diameter 4.5 cm and a semicircle of radius 4.5 cm are drawn in the given figure. Find the area of the shaded region
Four equal circles each of radius a, touch each other. Show that area between them is `6/7a^2`
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.
A wire when bent in the form of a square encloses an area of 484 cm2. If the same wire is bent into the form of a circle, find the area of the circle.
A cart wheel makes 9 revolutions per second. If the diameter of the wheel is 42 cm, find its speed in km/hr.
The circumference of a given circular park is 55 m. It is surrounded by a path of uniform width of 3.5 m. Find the area of the path.
Find the area and perimeter of the following semicircles: Diameter = 7cm
The diameter of a cycle wheel is `4(5)/(11)"cm"`. How many revolutions will it make in moving 6.3km?
A circular pond is 17.5 m is of diameter. It is surrounded by a 2 m wide path. Find the cost of constructing the path at the rate of Rs 25 per m2.
