Question

- The diameter of the driving wheel of a car
is 70 cm. How many revolutions per minute
must the wheel make in order to keep the
speed of 66 km/hr?​

Answer 1

Answer:

550

Step-by-step explanation:

The required Speed is 66 km/hr.

i.e. 66km in 60 minutes.

i.e 6600000 cm in 60 minutes.

i.e. 110000 cm in 1 minute.

With the required speed, the wheel must complete 110000 cm in distance.

Diameter of wheel is 70 cm.

Radius of wheel, r= 35 cm.

Circumference of wheel= 2πr=2*(22/7)*35=220cm.

Number of revolutions=Distance/Circumference of wheel=110000/220=550 divide this to get your answer

550 revolutions per minute

Answer 2

Answer:

please give me some thanks I will also give you