Awater pipe is inclined 40.0° below the horizontal. the radius of the pipe at the upper end is 2.00 cm. if the gauge pressure at a point at the upper end is 0.112 atm, what is the gauge pressure at a point 2.65 m downstream, where the pipe has narrowed to a 1.00 cm radius? the flow rate is 20.0? cm^3/s

Explanation:

As it is given that flow rate in the pipe is 20 cm^3/s

so we have

at the upper end the area is given as

Also at the other end

now the speed at two ends is given as

now by Bernoulli's theorem we have

now we have

Now we have

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

im guessing the west of station b