A helium-filled weather balloon has a volume of 200 L when it is on the ground, where the pressure is 1 atm. What will its volume be at a height of 2 km, where its pressure is 0.785 atm, assuming that the temperature remains constant?

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Which subatomic particle has a negative charge