)water at 20◦c flows at a rate of 0.020 m3/s through a 90◦ reducing elbow. the diameters at the entrance and exit are 0.050 m and 0.030 m, respectively, and the pressure at the exit is 105 pa. use macroscopic balance for momentum to compute the resultant components of the force [n] on the elbow neglecting gravitational and frictional effects.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j

1 is a answer of a question