It rains during the construction of a building and water fills a recently excavated pit to a depth, h=0.5m. in order to continue construction, the water must first be pumped out of the pit. a hose with a length of l=50m, a diameter of d=2.5*10-2 m, and a surface roughness of e=5.0*10-5 m is attached to a pump. note that the kinematic viscosity of the water is n=1.005*10-6 m2 /s and the density is r=1000 kg/m3 .

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.