How does our body detect light in the wavelengths between 2.9 x 10^-6 and 1.5 x 10^-6 inches *
Via our skin; these are UV waves
Via our ears; these are sound waves
Via our eyes; these are visible light waves
These wavelengths are outside of human perception

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?