Question

The wheel of a car has diameter 80cm how many complete revolution does each wheel make in 10 minute when the speed of a car 66km /hr

Answer 1

here is ur answer buddy
r=40cm
2πr=2*3.14*40
=80*3.14
=251.2m
time=distance/speed
distance=time *speed
=10*66*60
=6600*6=39600
n*2πr=39600
n=39600*7/(22*80)
n=157.5
hence 157.5 revolution s

Answer 2

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$\underline\bold{\huge{solution!!}}$

Diameter of wheel = 80 cm

Then radius will be = 80/2 = 40 cm

Circumference of wheel =
$= 2 \times \frac{22}{7} \times 40 \\ = \frac{1760}{7}$
$Circumference = \frac{1760}{7×100000} Km$

Circumference = 0.0025 km

speed of car = 66km/hr.

Time = 10 min = 1/6 hr.

Distance = time × speed

$Distance = 66 × \frac{1}{6}$

Distance = 11 km

Number of complete revolution

$= \frac{Distance}{Circumference}$

$= 11÷ \frac{1760}{7×100000}$

$=\frac{11}{0.0025}$

= 4400

HENCE , Number of complete revolution are 4400.

Hope it helps you ☺