00:01
In this question in parts a, you need to find the buoyance force acting on the balloon when it is in the air.
00:11
Okay, so we'll be using the density of air, the volume of the balloon times g.
00:18
And then if you substitute the numbers, you get 1 .29 as the density of the air.
00:26
Then the volume of the balloon in meter cube, then times 9 .81, then you should be getting 0 .0 to 53 mutants.
00:44
So this is the value of the buoyance force.
00:55
Next in part b, we need to find the net vertical force on the balloon when it is let go.
01:08
So first we need to find a weight.
01:10
Of balloon plus the helium air okay so this is equal to the m of the balloon plus m of the helium gas the mass times g so the mass of the balloon is 1 .5 times 10 to the minus 3 kg and then the mass of the helium gas you calculate using the density of the helium gas multiply by the volume in meters queue and then this whole thing multiply by 9 .81.
02:00
And then when you calculate, you should be getting 0 .0, 1 .2 newton...