A rocket nozzle is designed to operate isentropically at 20 km with a chamber with stagnation pressure of 2.0 MPa and temperature of 3000 K. If the products of combustion are assumed to behave as a perfect gas with constant specific heats (y = 1.3 and MW = 20 kg/kmol), determine the design thrust for a nozzle throat area of 0.25 m². Hint: Thrust, T = m Volk + Por.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?