A light balloon is filled with 400 m3 of helium at atmospheric pressure. a) what mass of payload can the balloon lift? b) what load can the balloon lift if filled with hydrogen? ρHe = 0.164 ൗ Kg m3 ρH = 0.082 ൗ Kg m3

Fifteen gallons of hydraulic oil weigh 108.7 lb. What is the specific weight γ in units of lb/ft3? Select all that apply. (Note: 1 gal = 0.1337 ft3)

A child takes a helium balloon on a plane from Denver (with an air pressure of 0.83 atm) on a cool day when the temperature is 20.0oC to Boston (at sea level, with an air pressure of 1.0 atm) where the temperature is 5.0oC.  Assume that no gas escapes from the balloon during the flight.  What is the volume of the balloon in Boston, relative to its size in Denver? Group of answer choices The volume in Boston is 0.79 times the volume in Denver. The volume in Boston is 0.20 times the volume in Denver. The volume in Boston is 0.87 times the volume in Denver The volume in Boston is 1.3 times the volume in Denver. The volume in Boston is the same as the volume in Denver.

A wind generator is installed. It is determined that the capacity factor of the installation is 29% over the course of a 90-day period. In that period, it produced 1566 MWh. What is the size of the installation (MW)?