Assume that before separation, the weight of the milk bottle's contents (mixed milk and cream) is wmix. how does the combined weight of the milk and cream after separation, wsep, compare to wmix?

learn it on the intertant so you can solve

d) physical means can be used to separate the components of air.

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