In which situation is no work considered tone be done by a force? a) when the angle between the force and displacement is 180° b) when the angle between the force and displacement is 90° c) when the angle between the force and displacement is 45° d) when the angle between the force and displacement is 0°

Air flows upward in the wick of a lantern because of the liquid property called

What is the fate of the electrons that interact with a specimen in an electron microscope?

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.