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.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2