A tubbular (hollow) bronze shaft (Tallow=100MPa) has an outside diameter of d0=60 mm and an inside diameter of di= 50mm. How much power , P(kw), can be delivered by this shaft rotating at a speed of 5rev/s.

Provide complete solution and diagram for this problem.  What is the equivalent head of 15cm mercury in water ?  A. 10m      B. 1.36m    C. 2.04m    D. 16.34m

A bedroom has a volume of 115 m^3. What is its volume in: dm^3

A windmill turns a series of slender rods fixed about one end (see formula below). They are initially 2 meters long, and go at a speed of 15 rpm. I suggested making the blades 1m long to reduce the cross-sectional area of the windmill, keeping the mass the same for mechanical stress consistency. How fast are the windmill blades going now, in revolutions per minute?