3. A carrot, 0.8kg, is sitting on a cutting board at rest. With a yell, a chef hacks it in two. Find the velocity of the other piece if a)a 0.4kg piece goes to the left at 3m/s b) a 0.7kg piece goes to the right at 35m/s c)a 0.2kg piece goes to the left at 6m/s d)a 0.5kg piece stays at rest.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

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?

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)