A student working on their UCM lab swings their rubber stopper around in a circle and records a total time of 6 seconds for the rubber stopper to complete 5 revolutions. If the radius of the rubber stopper's circular path is 0.6 meters, what must be the speed of the object in m/s?

the answer is b ) square root of 5

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

thermal energy is the answer

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