6. A balloon weighing 80 kg has a capacity of 1200 m². If it is filled with helium, how much of payload can it support? The density of helium is 0.18 kg/ mº and the density of air is 1.30 kg/m' Express your answer in newton.​

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

In science and physics what is the standard unit of measure for speed?

In an experiment, how can i change human errors? be specific.