Air flows through a duct of constant cross-sectional area a=0.1m2 . at a certain point ‘x’ in the duct, the pressure is measured at 1.5 bar, the temperature is 100°c, and the air velocity is 100 m/s. at another point ‘y’, the pressure has dropped to 1.4 bar, and the velocity of the air is now 171.4 m/s. you may assume that the flow is frictionless.
1. using the data recorded at point x, calculate the mass flowrate of air in the duct
2. calculate the temperature at point y
3. write the steady flow energy equation out in full, and then simplify it to calculate the heat added to the air between points x and y

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s. a. determine jay’s mass. b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

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