Consider an oblique shock wave with a wave angle of 36.87◦. the upstream flow is given by m1 = 3 and p1 = 1 atm. calculate the total pressure behind the shock using a. p0,2/p0,1 from appendix b (the correct way) b. p0,2/p1 from appendix b (the incorrect way) compare the results.

Maybe c? sorry if im wrong

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

Answerlosing electrons;