Loggers cut down 2 identical trees. one tree was cut down with a hand saw and one was cut down with an electric saw. which activity involved more work? which one involved more power?

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

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.