Dos poleas de diferente tamaño se encuentran unidas por medio de una correa que no desliza. Los radios de las poleas son 30 cm y 10 cm. La polea mayor se encuentra unida a través de su centro con un motor que se encuentra girando con una velocidad angular de 8 rad/s. Determine: 1)La velocidad tangencial de la polea 1. 2)La velocidad angular que tendrá la polea 2. 3)El radio que tendría que tener otra polea (3) unida a la polea menor por medio de otra correa para que esta gire con una velocidad angular de 2 rad/s.

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.

In which of the following would the particles move most rapidly? a. ice at -20 °c b. water at 20 °c c. steam at 110 °c d. boiling water e. ice at 0 °c

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up