Question

an object moving in a circle of radius 7cm calculate the distance and displacement .
a) when it completes half a circle
b) when it completes full circle

please tell fast
whosoever will give me right answer and fast i will make it brainliest and follow​

Answer 1

Assume a circle having radius 7 cm (Diameter = AB = 14 cm) and object starts moving from point A to point B. Here it covers half of the revolution. If it return backs to it's initial point i.e. A then it covers the one complete revolution.

Given that, an object completes one round of a circle of radius 7 cm.

We have to find the the distance and displacement of the object.

For one complete revolution:

Distance covered in one round = Circumference of circle.

{ Circumference of circle = 2πr }

So,

Distance covered in one round = 2πr

= 2 × 22/7 × 7 = 44 cm

For half revolution:

Distance covered by object = 1/2 × 2πr

= 22/7 × 7 = 22 cm

Now,

Displacement is defined as the shortest distance between the initial and final points.

For one complete revolution:

If an object completes one round of a circle, then it's displacement is zero. As it's initial and final points are same.

For half revolution:

Displacement of an object is equal to it's diameter of circle.

Displacement of an object is 14 (2*7) cm.