Air at a temperature of 20 °C is flowing with a speed 160 m/s. A bullet is fired into the air stream with a speed of 750 m/s. The direction of the bullet is opposite to that of the air. Calculate the following:. a. The Mach number of the air flow. b. The Mach number of the bullet if it were fired in still air. c. The Mach number of the bullet with respect to the moving air.

reserve is the answer

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

i'm on my way to history not a mistory.

there are no contact forces mentioned on the list of choices that you've provided.