You have a ball with mass 1.3 kg tied to a rope, and you spin it in a circle of radius 1.8 m. If the ball is moving at a speed of 3 m/s, what is the centripetal force acting on the ball? (2 points)

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For which pair of objects would adding the same a

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.