balloon

[daisyi]

A 30kg balloon is filled with 100m^3 of hydrogen. How much force is needed to hold it down??


I'm not even sure which formula to use with this one. :confused:

[arildno]

What is the total weight of the system balloon+hydrogen?
What is the buoyancy force of air associated with 100m^3 volume?

[daisyi]

got it, thanks...


i guess the biggest problem was that the answer was given in newtons and i had it in kgs.

newtons alway smess me up :P

thanks for your help!

[arildno]

NB!
Force is measured in newtons, mass is measured in kgs (in the IS system, that is).

This is completely different concepts, and mixing up units on exams, for example, is a VERY BAD THING (at least in Norway..)

[1+1=1]

NB!
This is completely different concepts, and mixing up units on exams, for example, is a VERY BAD THING (at least in Norway..)

it is the same here in the states...
:biggrin: