A closed tin containing 5000cm³ of paint has a mass of 7.0kg. () if the mass of the empty tin, including the lid, is 0.5kg, calculate the density of the paint.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Difference between series and parallel circuits

Estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29×10 to the power of −11 m, the expected position of the electron in the atom.