Determine the greatest weight of the log that can be pushed up the incline. the coefficient of static friction between the log and the ground is μs = 0.60, and between the rear wheels of the tractor and the ground μ′s = 0.75. the front wheels are free to roll. assume the engine can develop enough torque to cause the rear wheels to slip.

Fluids at rest possess no flow energy. a)- true b)- false

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.