Walk 42 miles due north, deviate 78 degrees to east, and walk 65miles. what is the displacement? ( magnitude and direction with respect to north). a) show work through calculations for predictions

This is the substance(s) formed in a chemical reaction.

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?