Jack and his lab partner did an experiment on the results of heating different
combinations of chemicals on a hot plate. he performed four trials, each combining two different chemicals. jack recorded several observations from the experiment.

which of his observations was a qualitative result?

a. the product of the fourth trial was a liquid with a volume of 150 ml.

b. the chemicals combined in trial one turned blue when heated.

c. the product of the second trial was a solid with a mass of 50g.

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

What organization and environment is described above?

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)