The electrostatic force between two-point charges is F. The charge on each point charge is doubled and the distance between charges is also doubled. What is the new
force between them?

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.

Most short-period comets do not have randomly oriented orbits because

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s. what is the wavelength?