diameter solid steel cylinder in which a 7 mm diameter hole has been drilled from end B up to point C. The shaft is attached to fixed supports at each end, and a 150 Nm torque is applied at C. The torque reaction at A is 72 Nm. What is the max shear stress in the shaft? Input your answer as a value only in MPa to one decimal place without +/- sign. A 150 Nm L₂

Need help solving this problem. Please provide clear and concise steps in neat handwriting.

Need help with the following problem involving calorimetry!

An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).