Two people fell down, one onto hard cement and one onto softer grass. Both people had a mass of 100 kg and were moving at 4 m/s as they fell. The person who hit the hard cement came to a complete stop very quickly, in .01 seconds. The person who fell onto the softer grass also came to a complete stop, but they did so more slowly, 0.5 seconds. What force did each of them experience when they came to a stop? Force on person who fell on cement Newtons Force on person who fell onto grass Newtons

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.

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)

What are some important factors to consider when choosing a warm-up before your workout?