Two questions: Power can be defined as
1. the distance over which work was done
2. how much work can be done in a given time
3. all the work in a given area
4. the energy required to do work

AND

Which of the following is an example of kinetic energy:
A) A can of paint sitting at the top of a ladder
B) A dog running down the street
C) A bird perched on a wire
D) A person taking a nap

nah.   i'm just sleepy.

conduction, convection, radiation

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

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