A 70 kg bicyclist is coasting down a long hill with a 1.9 degree slope. He's moving quite rapidly, so air drag is important. His cross-section area is 0.32 m^2 and his drag coefficient is 0.88. What speed does he eventually reach, in mph?

Which accurately compares concave and convex lenses?

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 does gravity have a lesser than grater effect on higher altitudes?