MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Tushar Watts Grade: 12
        

Ques1) A particle is placed at rest inside a hollow hemishere of radius R. The coefficient of friction b/w the particle and hemisphere is 1 / (3) 1/2. Show  the maximum height upto which the particle can remain stationary [1- (3) 1/2/2]R.


Ques2) A block of mass m  is paled at rest on a horizontal rough surface with the angle of friction @. The block is pulled with a force F at an angle theta with the horizontal.Show that the mmin value of F required to move the block is [mgsin@ ] / cos( theta - @).


Ques3)  A horizontal force F = mg/3 is applied on the upper surface of a uniform cube of mass m and side a which is resting on  a rough horizontal surface having coefficient of friction = 1/2.Show that the distance b/w the line of action of mg and normal reaction is a/3.

8 years ago

Answers : (1)

Ramesh V
70 Points
										

(1)



here OM = R , to find= AM


on balancing forces we have


normal rxn. N = mg.cosx


                      f = mg.sinx


  where f = friction coeff. * N


i.e.,


f = mgcox /31/2


so tan x = 1/31/2


so height at which particle remains stationary is Am = OM - OA = ( 1 - 31/2 /2 )R


(2)


Its solved in my previous posts asked by you


http://askiitians.com/forums/Mechanics/10/3377/Laws-of-Motion.htm


(3)



on balancing moments about centre of gravity gives:


mg*a/2 + mga/3 = mg (a/2 + x)


on solving for x gives


x=a/3


Hence,the distance b/w the line of action of mg and normal reaction is a/3.


---


Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best.



Regards,

Naga Ramesh

IIT Kgp - 2005 batch




8 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete Physics Course - Class 12
  • OFFERED PRICE: Rs. 2,756
  • View Details
  • Complete Physics Course - Class 11
  • OFFERED PRICE: Rs. 2,968
  • View Details

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details