1. consider the flow of air through a convergent-divergent nozzle with a throat cross-section at = 0.4m2 and an exit-to-throat area ratio of 1.616. assuming that the reservoir conditions are p0 = 5.5 · 105p a and t0 = 550◦c, determine the exit mach number me and the mass flow ˙m through the nozzle when the pressure outside the reservoir pa attains the following values:
(a) pa = 5.0 · 105p a.
(b) pa = 2.2 · 105p a.
(c) pa = 0.4 · 105p a.
(d) draw the pattern of shocks and expansion waves at the nozzle exit for the last case.
2. in low-speed incompressible flow, the peak pressure coefficient (at the minimum pressure point) is cp = −0.48. estimate the critical mach number for the given airfoil, using the prandtl-glauet rule.

the part of the wave he is travelling on is the crest

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.