Liquid hazardous wastes are blended in a cstr to maintain a minimum energy content before burning them in a hazardous waste incinerator. the energy content of the waste currently being fed is 8.0 mj/kg (mega-joules/kilogram). a new waste is injected in the flow line into the cstr. it has an energy content of 10.0 mj/kg. if the flow rate into and out of the 0.20 m3cstr is 4.0 l/s, how long will it take the effluent from the cstr to reach an energy content of 9 mj/kg?

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?