The tubular drive shaft for the propeller of a hovercraft is 6 m long. If the motor delivers 4 MW of power to the shaft when the propellers rotate at 25 rad/s, determine the required inner diameter of the shaft if the outer diameter is 250 mm. What is the angle of twist of the shaft when it is operatiog?Take 'Tat1ow= 90 MPa and G = 75 GPa.

ENGR 121 B Lecture Notes for 11/07/2016 Spencer Kociba ● Error thresholds ○ eps=2.2204e-16 ■ Maximum error threshold constant in MATLAB a−b ■ The relative erro[a] )must be less than eps to be considered not significantly different from each other ■ NOTE: 1+esp ≠ 1 even though ans=1.000 ● For loops are almost never necessary when performing a function for every element in a vector or matrix ● Vectorizing ○ Re-writing code using loops (traditional programming language) to vector and matrix operations in MATLAB ● Preallocating memory ○ Faster than dynamically growing the number of vector elements using a