Ajet engine is being tested on a test stand. the inlet area to the compressor is 0.2 m2 and air enters the compressor at 90 kpa, 100 m/s. the pressure of the atmosphere is 100 kpa. the exit area of the engine is 0.1 m2, and the products of combustion leave the exit at a pressure of 130 kpa and a temperature of 1000 k. the air fuel ratio is 46 kgair/kgfuel , and the fuel enters with a low velocity. the mass flow rate of air entering the engine is 20 kg/s a)determine the inlet temperature b) determine the exit velocity of combustion products. c) determine the thrust on the engine

The anwser is: wave a has a greater pitch and frequency.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

The correct answer is waves