Two an electric motor weighing 2,500 n is supported on four springs, each having a stiffness of 4.4 kn/m. the rotor has a weight of 500 n with its center of mass located at a distance of 0.2 mm from the axis of rotation. assume the system has damping ratio equivalent to ? 0.2. find the amplitude of vibration of the motor and the force transmitted through the springs to the base when motor is running at 120 rpm

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.