A helium balloon ride lifts up passengers in a basket. Assume the density of air is 1.28 kg/m3 and the density of helium in the balloon is 0.18 kg/m3. The radius of the balloon (when filled) is R = 4.8 m. The total mass of the empty balloon and basket is mb = 120 kg and the total volume is Vb = 0.068 m3. Assume the average person that gets into the balloon has a mass mp = 71 kg and volume Vp = 0.079 m3.

1) What is the volume of helium in the balloon when fully inflated?
2) What is the magnitude of the force of gravity on the entire system (but with no people)?
3) What is the magnitude of the buoyant force on the entire system (but with no people)?
4) What is the magnitude of the force of gravity on each person?

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

True or false graphs must include scales that increase by the same amount

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above