ROTATIONAL DYNAMICS


In figure,there are shown two similar,uniform,rigid rods A and B each of mass M and length L are placed in contact at their one ends,on a smooth horizontal table.A sharp impulse is applied at one end of the rod A as
shown in the figure.Calculate the angular velocity of the rod A just after the impulse when rod A leaves off its contact from rod B.

The options are
(a) 6I/(5ML)
(b) 8I/(5ML)
(c) 18I/(5ML)
(d) 5I/(18ML)

18 Answers

1
chinmay ·

wait ,let me check up with the key.

1
chinmay ·

1
chinmay ·

u got moi=5ml2/12?

3
iitimcomin ·

3
iitimcomin ·

ohh ....sorry....vertical (wrt ur diagram)!!!!!!!!

1
chinmay ·

horizontal distance or vertical distance?

3
iitimcomin ·

see take ther com of the rods ...................find the horizontal distance of that from I.....call it d.................Id = (moi)rod about com*w .......................find w!!!!!!!!!

1
chinmay ·

how did u get it?

1
chinmay ·

answer is c.
Can u pls post the solutn.

1
chinmay ·

can anyone do it??

3
iitimcomin ·

im gettin c........

1
chinmay ·

pls

1
chinmay ·

can anybody solve it??

1
? ·

... not able to solve !!.. doubt is whether the vertical rod will slide finally ?

1
chinmay ·

anyone?

1
chinmay ·

then can u pls solve?

62
Lokesh Verma ·

Hint:
1) An impulse will act at the a single point between A and B
2) The CM of the system will move according to I only

To be true i havent tried to one.. but if none of u can i will definitely try to solve this one :)

1
chinmay ·

gdgdg

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