If a tennis ball has a velocity of 18 m/s and a momentum of 1.06 kg • m/s, what is the mass of the tennis ball in grams?

Avalue that describes how heavy an object is and is related to the force of gravity is

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

Convection occurs when thermal energy is transferred by the movement of