Arectangular river channel, 7 m wide, carries water at a depth of 1.4 m. the slope of the channel is 1/500. the channel has poor alignment and the bed is covered with stones such that a manning's n value of 0.06 is appropriate. calculate the flow rate in the channel and prove whether the flow is sub-critical or super- critical. [5 marks] (c) for a rectangular channel, determine the relationship between its width, w, and depth, d, that will result in the maximum discharge.

Why is there friction between objects

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0