Example 9 : The diameter of a wheel is 28 cm.
It rolls through a distance of 22 meters. How many
revolutions will it mak

2 thoughts on “Example 9 : The diameter of a wheel is 28 cm.<br />It rolls through a distance of 22 meters. How many<br />revolutions will it mak”

1. Answer:

   tThe coulomb force between two charges q1, q2 is:

   F =kq1q2/r^2

   k = coulomb’s constant = 1/4πεε0

   ε0 = permittivity of empty space

   ε = relative permittivity of the material in which the charges are immersed

   r = distance between charges

   for vacuum ε=1 and for air also, to a very good approximation ε=1.

   For water , at room temperature ( 20C) ε = 80.

   Therefore, the force between the charges q1, q2 will be 1/80 its value in air.

   Hence Fw, the force in water will be:

   Fw = 80/80 = 1N.

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2. Step-by-step explanation:

   => Given diameter of a wheel =28cm

   => Radius is = 14cm

   => Circumference of wheel = 2πr

   => Distance travelled in one revolution = 2 × π × 14

   => Total distance = 22m = 2200cm

   => So, number of revolution make by wheel = 2200/28π = 25

   I hope this will help you dear..

   Always stay safe and stay healthy..

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