The heat of combustion of hydrogen (the energy released by burning hydrogen with oxygen) is 1.43×108J/kg. What mass of hydrogen would have to be burned in the sun in one second to release the same amount of energy (i. e., generate the same power) as is released by fusion? Express your answer in kilograms to two significant figures. View Available Hint(s)

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.