Is the earth’s magnetic field parallel to the ground at all locations? if not, where is it parallel to the surface? is its strength the same at all locations? if not, where is it greatest?

What is the radius of the circular path ofa charged particle in a magnetic field?

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3