The lifting force of a helium balloon is equal to the difference in mass between a balloon full of air and a balloon full of less dense gas. calculate the volume and radius of a balloon needed if it is desired to have a lifting force (mass) of 1000 kg when the temperature is 290 k at 0.940 atm. the balloon is to be filled with helium. assume that air is 80 mol % n, and 20 mol % o2

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Which of the following is true about the speed of light? it depends on the wavelength.