SaraNextGen Study App [2023-24]
Last Updated On 01-06-2023 - By Jeesha Sara

An impulse  at one end of a stationery uniform frictionless rod of mass  and length  which is free to rotate in a gravity-free space. The impact is elastic. Instantaneous axis of rotation of the rod will pass through

a)

Its centre of mass

b)

The centre of mass of the rod plus ball

c)

The point of impact of the ball on the rod

d)

The point which is at a distance 2/3 from the striking end


Question ID - 100096 :-

An impulse  at one end of a stationery uniform frictionless rod of mass  and length  which is free to rotate in a gravity-free space. The impact is elastic. Instantaneous axis of rotation of the rod will pass through

a)

Its centre of mass

b)

The centre of mass of the rod plus ball

c)

The point of impact of the ball on the rod

d)

The point which is at a distance 2/3 from the striking end

1 Answer
5876 Votes
3537

Answer Key : (d) -

(d)

 Velocity of the CM of rod =

Applying impulse momentum equation about the CM of rod

About instantaneous axis of rotation the rod is considered to have pure rotation

Let instantaneous axis of rotation be located at a distance  from the colliding end

…(i)

Substituting the value of  in Eq.(i), we get



Next Question :

In the question given below, there is a number series with one term missing shown by “?”.  The term is given as one of the alternatives among four options given below it.  Find the term.

, 30, 45

(a)

20

(b)

22

(c)

24

(d)

18


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