Air at 20 C flows through the tube shown in Figure P13.66. Assume that air is an ideal fluid. What are the air speeds v1 and v2 at points 1 and 2? What is the volume flow rate?

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

a 2,000 calorie based diet.

the answer to this is proletariats.

hope this : )