Advertisements
Advertisements
प्रश्न
The wheel of a motor cycle is of radius 35 cm. How many revolutions per minute must the wheel make so as to keep a speed of 66 km/hr ?
उत्तर
Given, radius of wheel, r = 35 cm
Circumference of the wheel
= 2πr
= `2 xx 22/7 xx 35 "cm"`
= 220 cm
But speed of the wheel
= 66 km/h–1
= `(66 xx 1000)/60` m/min
= 1100 × 100 cm/min–1
= 110000 cm/min–1
∴ Number of revolutions in 1 min
= `(110000)/220`
= 500 revolutions
Hence, the required number of revolutions per minute is 500.
संबंधित प्रश्न
A rectangular piece is 20m long and 15m wide from its four corners, quadrants of 3.5m radius have been cut. Find the area of remaining part.
The circumference of a circle exceeds its diameter by 45 cm. Find the circumference of the circle.
The radius of the circle is given below; find the area.
28 cm
Find the area and perimeter of the following sector :
Radius= 6 cm, angle at the centre is 70°
The speed of the car is 66 km/hour. If each wheel of the car is 140 cm in diameter, find the number of revolutions made by each wheel per minute.
The radius of a circle is 5 m. Find the circumference of the circle whose area is 49 times the area of the given circle.
Find the diameter of a circle whose circumference is equal to the sum of circumference of circles with radius 10 cm, 12 cm, and 18 cm.
Find the area and perimeter of the following semicircles: Radius = 1.4cm
The area of a quadrant of a circle whose circumference is 22 cm, is ____________.
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.
