Question

Help needed

Answer 1

http://screencast.com/t/v6XIdFASMPu
@mathslover

Answer 2

don't we have to care about the centre of mass ?

Answer 3

yes.. you need to worry about centre of mass!

Answer 4

you can't just do mgh here!

Answer 5

initially U = mgh/2
finally U = mgh/4

Answer 6

just wondering where does the energy go ??

Answer 7

Something has to push the water up in the formerly empty container.

Answer 8

hmm

Answer 9

how is final mgh = mgh /4

Answer 10

potential energy in each container = (m/2)g(h/4) = mgh/8
total energy = 2 *mgh/8 =mgh/4

Answer 11

can i know why initial PE = mgh / 2

Answer 12

check out the figure in the question. The entire mass,m is in one container filled upto height, h. So center of mass is at height h/2. This gives U = mgh/2