Air ows over a wall at a supersonic speed. The wall turns towards the ow generating an oblique shock wave. This wave is found to be at an angle of 400 to the initial ow direction. A scratch on the wall upstream of the shock wave is found to generate a very weak wave that is at an angle of 300 to the ow. Find the angle through

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.