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
Arunav Nag Grade: 11
        

how much work is done in raising a stone of mass 5 kg and relative density 3 lying at the bed at the of a lake through height of 3 meter? (taking g = 10 10m/s square )?????


(a) 25 j              (b) 100j


(c) 75j                (d) none of the above....

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

net force = W - boyancy                  


ds , dw are dencity  of stone & water respectively & V  is volume of stone then ,


boyancy = dwVg


W = mg = dsVg


Fnet = Vg(ds-dw)


Fnet = ma = dsVg


a = g(1-dw/ds


relative dencity = ds/dw = 2 (given)


so  ,a = g/2


now work is done against this force


work = maX                 (X displacement)


       =5*(g/2)3 = 75j

6 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