I pull my child in a sled over the snow. The rope makes an angle with the horizontal so that the pulling force has a horizontal component of 16 N and a vertical component in the upwards direction 25 N . The combined weight of the child and sled is 84 N . I'm getting tired and so the sled is slowing at a constant rate of 0.80 m/s each second. Calculate the magnitude of the frictional force between the sled and the snow.

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)