Define power and describe how to determine power i need this asap

Aparticle with mass 1.81×10−3 kg and a charge of 1.22×10−8 c has, at a given instant, a velocity v⃗ =(3.00×104m/s)j^. what are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field b⃗ =(1.63t)i^+(0.980t)j^?

The air that we breath is made mostly of which gaseous molecule

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?