Arocket engine receives 9 kg/s of liquid oxygen and 3 kg/s of liquid fuel. after complete combustion of the mixture, the exhaust gases (density = 0.3733 kg/m^3) leave the rocket through a 14-cm diameter horizontal nozzle at a pressure equal to the surrounding air pressure. determine the thrust force produced by the rocket.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length