00:01
In this question it is given that this is a rubber balloon.
00:10
The weight force of the balloon is acting in the downward direction.
00:16
This includes the weight of the rubber, mass of rubber, into g plus the weight of the helium inside the balloon.
00:29
The weight of helium inside balloon is density of helium into g into volume into volume.
00:36
Of the balloon.
00:38
The volume of the balloon is v and in the upper direction the bind force is acting.
00:46
Bind force is equal to density of air into g into volume of the balloon.
00:56
Now first of all write the known quantities.
01:01
The volume of the balloon is given as 2 .8 liter.
01:08
2 .8 liter is equal to 0 .0028 meter cube.
01:22
2 .8 liter is equal to 0 .0028 meter cube.
01:35
The density of air is row a equal to 1 .23 kjee.
01:46
Per meter cube and the density of helium is equal to 0 .178 kg per meter cube.
02:07
Now in the first part of the question we have to find the bind force on the balloon.
02:18
The bind force on the balloon is b is equal to this force, row a so band forces row a into g into volume of the balloon...