Sat problem

>>380786
> how many more kilograms to the nearest hundredth

okay so the answer looks like #*.##kg, just need to figure out the #s

> a 2 cubic meter balloon filled with air... than an identical balloon filled with helium

so the #s are (air balloon weight in kg) - (helium balloon weight in kg), just need to figure out what those #s are, but right now i only know the sizes... i need some way of converting sizes (cubic meters, what i have so far) to weights (kgs, what the answer needs)

> helium has a density of 0.179kg/m^3 and air has a density of 1.2 kg/m^3

okay, i have densities in kg/m^3. those aren't my answers because the units are wrong–i want kg, not kg/m^3. so multiply the kg/m^3 by m^3, right? that gives us

air balloon : 2m^3 * 1.2 kg/m^3 = 2.4 kg
helium balloon : 2m^3 * 0.179kg/m^3 = 0.358 kg

okay sweet now i have kg, from earlier i needed (air balloon weight in kg) - (helium balloon weight in kg), so we get 2.4 kg - 0.358 kg = 2.042 kg

great we're done! but not quite, because the answer only has hundredths, not thousandths, so I need to round to 2.04 kg.

and now im done, 800 points right there, welcome to stanford

>>380791
Thanks