Question

The wheels of a car are of diameter 80cm each how many complete revolutions does each wheel make in 10 minutes in a car is travelling at a speed of 36 km per hour

Answer 1

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4800 revolution

step-by-step explanation:

Given,

diameter of wheels of car = 80 cm

.°. radius, r = 80/2 = 40 cm

Now,

Circumference of wheel = 2πr

= 2π × 40 cm

= 80π cm

Now,

speed of car = 36 km/hr

it travels 36 km in 1 hr

or,

36 km in 60 min

or,

1 km in 60/36 min

or,

1000 m in 60/36 min ( °.° 1km = 1000 m)

or,

${10}^{5}$ cm in 60/36 min (°.° 1 m = 100 cm)

Now,

in 60/36 min = ${10}^{5}$ cm distance is covered,

or,

in 1 min = $36×{10}^{5}/60$ cm

.°. in 10 min

= $10×36×{10}^{5}/60$ cm

= $6×{10}^{5}$ cm

now,

no. of revolution = Distance/circulference

= $6×{10}^{5}/40π$

= $0.048×{10}^{5}$

= 4800

Hence,

4800 revolution

Answer 2

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⏬⏬Here is the answer⏬⏬



4800 revolution

step-by-step explanation:

Given,

diameter of wheels of car = 80 cm

.°. radius, r = 80/2 = 40 cm

Now,

Circumference of wheel = 2πr

= 2π × 40 cm

= 80π cm

Now,

speed of car = 36 km/hr

it travels 36 km in 1 hr

or,

36 km in 60 min

or,

1 km in 60/36 min

or,

1000 m in 60/36 min ( °.° 1km = 1000 m)

or,

{10}^{5}105 cm in 60/36 min (°.° 1 m = 100 cm)

Now,

in 60/36 min = {10}^{5}105 cm distance is covered,

or,

in 1 min = 36×{10}^{5}/6036×105/60 cm

.°. in 10 min

= 10×36×{10}^{5}/6010×36×105/60 cm

= 6×{10}^{5}6×105 cm

now,

no. of revolution = Distance/circulference

= 6×{10}^{5}/40π6×105/40π

= 0.048×{10}^{5}0.048×105

= 4800

Hence,

4800 revolution


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