An object weighs 25 N. how much power is used to lift it 7.3 m in 4.8 s?

P=38.0W

Explanation:

First find work done using

Ew=Fd

Ew=25×7.3

=182.5J

Then find power using

P=E/t

P=182.5/4.8

P=38.0W

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

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray