A rectangular channel contains a sluice gate which extends across the full width of the channel with an opening of 150mm. given Cd=0.50 and free flow, find the flow rate per unit width and the sluice coefficient when the upstream and downstream depths are 700mm and 80mm respectively.

Asolid steel sphere (k=63.9 w m-1 k-1 , ? =7832 kg m-3 , c=0.523 kj kg-1 k-1 ), 100 mm in diameter is initially at a uniform temperature of 500o c and is suddenly quenched in a large oil bath for which t? = 100o c and h = 3200 w m-2 k-1. estimate the time required for the sphere to cool to 200o c and to 110o c