C) The longer the line, the greater the magnitude of the vector. As for the direction, just think of a compass.
The intensity of a sound wave is defined as the amount of energy passing through a unit area of the wave front in unit of time.
Answer:

Explanation:
In this case, since the charged particle moves in circular motion, the centripetal force is equivalent to the magnetic force.

Answer:
Chemical to kinetic and thermal.
Explanation:
You would eat the food (chemical) than you would jog and move around (kinetic). While running your body would also give off heat (thermal).Than your body would sweat to cool itself down.