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Absorption spectra from distant galaxies consist of bands of coloured light crossed with black lines. The wavelengths of these black lines are shifted towards the red end of the spectrum when compared with l...

For this, we use the conservation of energy. We know that loss of kinetic energy = gain in potential energy, so KE = PE. Our equation is 0.5 m v 2 = m g h, but as we have m on both sides, this cancels. So, w...

First, we resolve the forces. So, if we take the positive direction to be the direction in which it is pulled, we get a force of +50N, and the friction goes against the motion, so the force of friction is -1...

First, we know our equation for resistivity rho = RA/L. We know that L and A are in [m], which are already in SI units - however, [ohms] are not SI units. We do know, however, we know that R = V/I, and that ...

Conduction, where particles within a conductor gain energy as they heat up and vibrate more vigorously passing energy onto adjacent particles as they collide. Convection, which only occurs in fluids, as flui...