Question

A cyclist is travelling at 6.6 km/h. If the diameter of the cycle wheel is 70cm, find the number of revolutions made by the wheel per minutes ​​

Answer 1

Given :-

Speed of the cyclist traveling = 6.6 km/h

Diameter of the cycle wheel = 70 cm

To Find :-

The number of revolutions made by the wheel per minutes.

Solution :-

We know that,

• d = Diameter
• r = Radius
• c = Circumference

By the formula,

$\underline{\boxed{\sf Circumference \ of \ a \ circle=2 \pi r}}$

Given that,

Radius (r) = 70/2 = 35 cm

Substituting their values,

c = 2 × (22/7) × 35

c = 2 × 22 × 5

c = 220 cm

According to the question,

$\underline{\boxed{\sf No. \ of \ revolution=\dfrac{Total \ distance \ per \ min}{1 \ revolution} }}$

Given that,

Speed = 6.6 km/h = 11000 cm/m

Circumference = 220 cm

Substituting their values,

= 11000/220

= 50 revolutions

Therefore, 50 revolutions are made by the wheel per minute.

Answer 2

Explanation:

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