Question

(b) A car acquires a velocity of 72 km per hour in 10 seconds starting from rest. Find (1) the acceleration,
(ii) the average velocity, and (iii) the distance travelled in this time.
37. (@) What is meant by uniform circular motion ? Give two examples of uniform circular motion
(b) The tip of seconds' hand of a clock takes 60 seconds to move once on the circular dial of the clock. If the​

Answer 1

Answer:

Given that:-

Initial velocity (u) = 0

Final velocity = 72km/h

= 20m/s

Time taken (t) = 10s

a) acceleration =(v-u)/t

=(20-0)/10

= 2m/s^2

b) average velocity = (v+u)/2

=(20+0)/2

=20/2

=10m/s

c) let distance be s

Using second equation of motion

=ut+(1/2)at^2

= (0)(10)+(1/2)(2)(10)^2

= 0+100

= 100

So, the distance covered by the body was 100m.

Uniform circular motion is explained as a circular motion of a thing in a constant speed. The examples of uniform circular motion are rotation of earth around sun or revolution of earth and Centripetal force. ... In this process speed remains constant and the path is circle in nature.

radius of dial of clock=10.5CM

Circumference of clock=2πr

=2*22/7*10.5

=21*22/7

=3*22

=66CM

= 0.66M

Time taken to complete 1 revolution=60Sec

Speed=distance/time

=0.66/60

=0.011 m/s

Explanation:

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