Question

(a) Identify the kind of motion in the following cases:

(i) A car moving with constant speed turning around a curve.

(ii) An electron orbitting around nucleus.

(b) An artificial satellite is moving in a circular orbit of radius 36,000 km. Calculate its speed

if it takes 24 hours to revolve around the earth.

Answer 1

a)
i - Circular Motion

ii - Circular motion




b) Raidus = 36000km

Circumference = 2πr
= 2×22/7× 36000
= 22685.71429

Now here circumference = Distance of the path travelled ( orbit)

Also we know that the moon travels its orbit once in 24hrs

Thus Distance = 22685.71429
Let Speed = x
Time taken = 24 hrs

Also, Speed = Distance/Time
Thus, x = 22685.71429/24
Speed = 9428.5714288 km/hr

Speed = 9428.66 km/hr (round off)

Hope it helps.

Answer 2

Answer:

The answers are a) Circular motion and b) 9425 km/hr.

Explanation:

a) Both the examples i.e. a car turning around a curve and an electron orbiting around nucleus are examples of circular motion.

b) Given,

Radius of circular orbit = 36000 km

Hence,

Distance travelled by satellite in a day = 2πr

= 2 x 3.14 x 36000

= 226195 km

Hence, Speed of the satellite

= Distance/time

= 226195/24

= 9425 km/hr

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