SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A disc is freely rotating with an angular speed  on a smooth horizontal plane. If it is hooked at a rigid page  and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to

a)

b)

c)

d)

None of these


Question ID - 100220 :-

A disc is freely rotating with an angular speed  on a smooth horizontal plane. If it is hooked at a rigid page  and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to

a)

b)

c)

d)

None of these

1 Answer
5876 Votes
3537

Answer Key : (b) -

(b)

During the impact, the forces pass through point . Therefore, the torque produced by it about  is equal to zero

Consequently, the angular momentum of the disc about , just before and after the impact, remains the same

      …(i)

Where   angular momentum of the disc about  just before the impact

 angular momentum of the disc about  just after the impact

Just before the impact, the disc rotates about . But just after the impact, the disc rotates about



Next Question :

A stationary body of mass 3 kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other. One with a velocity of 2  m/s and the other with a velocity of 3  m/s.If the explosion takes place in  s, the average force acting on the third piece in newtons is

a)

( )

b)

)

c)

( )

d)

( )


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