A converging-diverging frictionless nozzle is used to accelerate an airstream emanating from a large chamber. The nozzle has an exit area of 30 cm2 and a throat area of 15 cm2 . If the ambient pressure surrounding the nozzle is 101 kPa and the chamber temperature is 500 K, calculate the following:. (a) Minimum chamber pressure to choke the nozzle
(b) Mass flow rate for a chamber pressure of 400 kPa

An engine, weighing 3000 n, is supported on a pedestal mount. it has been observed that the engine induces vibration into the surrounding area through its pedestal at the maximum operating speed. determine the stiffness of the dynamic vibration absorber spring in (n/m) that will reduce the vibration when mounted on the pedestal. the magnitude of the exciting force is 250 n, and the amplitude of motion of the auxiliary mass is to be limited to 2 mm note: in this question type-in right numbers, no decimals, no fractions, no unit. approximate to right number if needed