I Review Part A- Transmitted power Learning Goal: To determine the maximum possible power transmission for a circular shaft and the minimum diameter required to avoid exceeding shear stress limits. A solid circular rod is used to transmit power from a motor to a machine. The diameter of the rod is D=2.25 in and the machine operates at w = 120 rpm. If the allowable shear stress in the shaft is 12 ksi, what is the maximum power transmissible to the machine? A rotating shaft can be used to transmit mechanical power from one place to another. For example, a shaft can be connected to a motor at one end and a pulley at the other. The shaft can then transmit power from the motor to the pulley. When the machine is operating, the shaft will rotate at some angular velocity w and will be subject to a torque T. The power transmitted by the shaft is P= Tw. Express your answer with appropriate units to three significant figures. > View Available Hint(s) ? The shaft's rotation can also be expressed as a frequency, f. which represents the number of revolutions of the shaft per unit time. The frequency and angular velocity are related by w= 2nf, so the power can also be calculated using P=2ñƒT. P = Value Units Submit When designing a shaft, one consideration is limits on shear Te stress. The torsion formula Tallow = relates the Part B - Minimum diameter allowable shear stress in a circular shaft with outer radiusc to the torque T. The polar moment of inertia is J ==e for 2 A solid circular shaft is required to transmit P = 43 kW from a motor to a machine. The maximum allowable stress in the shaft is Tallow = 75 MPa. If the machine runs at w = 16 rad/s , what is the minimum diameter for the shaft? a solid shaft. In the SI system, the units of torque are newton-meters ( N- m), and the units of power are watts ( 1 W=1N.m/s). In the FPS system, the basic units of torque are foot-pounds (ft - Ib), and the units of power are foot-pounds per second (ft - Ib/s). However, power is often expressed in horsepower, where 1 hp= 550 ft - lb/s. Express your answer in cm to three significant figures. > View Available Hint(s) Vo AEo | If vec ? D= cm