Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Stuck here, help me understand: A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other en

A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc

Option 1)

remains unchanged

 Option 2)

continuously decreases
Option 3)

continuously increases

 Option 4)

first increases and then decreases

Answers (1)

best_answer

As we learnt in

Rotational angular momentum -

\vec{L}= I\vec{w}

 

- wherein

I = Moment of inertia about fixed axis of rotation

w = angular velocity of rotation

 

 

 First - increases (towards the centre)

then - decreases (away from the centre)

We know that v=\omega\ r

\omega\ \alpha \;\frac{1}{r}

Ans. 4


Option 1)

remains unchanged

This is an incorrect option.

Option 2)

continuously decreases

This is an incorrect option.

Option 3)

continuously increases

This is an incorrect option.

Option 4)

first increases and then decreases

This is the correct option.

Posted by

Aadil

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2024 Topper: Farmer’s son Gajare Nilkrishna says ‘keep questioning until you understand’
anam-khan

NIT Puducherry Cut-off 2024: Computer Science and Engineering had highest closing rank last year
anam-khan

What after JEE Main results 2024? All you need to know about JEE Adv, CSAB, JoSAA counselling

Latest Question