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 travelling at a speed of 66 km per hour?
Answers
Radius of wheel= 80/2 = 40cm
∴ The distance travelled in one revolution is = 2πr = 2 x 22/7 x 40 = 1760/7 cm.
speed of car= 66km/hr= 66 x 1,00,000/60 cm/min = 1,10,000 cm/min.
distance covered by car in 1 min = 1,10,000cm
distance covered by car in 10min = 110,000 x 10 = 11,00,000cm.
number of complete revolution =
distance covered in 10min / distance covered in one revolution.
= 11,00,000/ 1760/7
= 11,00,000/1 x 7/1760 = 4375 revolutions.
Hence, in 10min each wheel of car makes 4375 revolutions.
Answer:
4375 no. of revolutions (。_。)
Step-by-step explanation:
d = 80 cm , r = 80/2 = 40 cm
speed = 66 km/h,
time = 10 min. = 1/6 hrs.
dis. = speed * time = 66 * 1/6 = 11 km = 1100000 cm
circumference of 1 wheel = 2 pi r = 2* 22/7 * 40 = 80 pi cm
no. of revolutions = total dis. / circumference of 1 wheel
= 1100000 / 80 pi
= 110000 / 8 pi
= 4375 no. of revolutions
I hope u find it useful. (°ー°〃)