A steel shaft is subjected to a fluctuating torque, T, as shown below. All surfaces are machined, reliability is 50%, and temperature is 200 F. Material properties are Su = 162 ksi and Sy = 138 ksi. 1.2 in. dia. 1.0 in. dia. T 0.1 in R T in. dia. hole 16 0.1 in R a) Find em, ea for this loading condition. b) If the loading is such that ea increases proportionally, find the safety factor for 106 cycles. σem 7000 lb-in. 3000 lb-in.

Looking for the correct answer and an explanation.

Interpret the significance of the letters shown in the illustration (A through F)

The two gears in the picture below on the left are meshing together. The two gears in the picture on the right are stuck together and are on the same shaft. Which of these statements is true when the gears are turning? (There may be more than one correct answer). A. The two meshing gears have the same |?| B. The two gears on the same shaft have the same |?| C. The two meshing gears turn through the same magnitude of arc-length in the same time D. The two gears on the same shaft turn through the same magnitude of arc-length in the same time