A 35.0g bullet moving at 475m/s strikes a 2.5kg wooden block. The bullet passes through the block, leaving at 275m/s. The block was at rest when it was hit. How fast is it moving when the bullet leaves?

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.

Estimate of the number of stars in our galaxy

The amount of potential energy possessed by an elevated object is equal to