a laboratory cart mi=500g is pulled horizontally across a level track by a lead weight m2=25g suspended vertically off the end of a pulley. If the lead weight falls 85cm then find speed of the system

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

f=ma newton

f=100x2.5=250n

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

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