1. Water at 20-C flows down an 80-m-wide parking lot at a constant depth of 5 mm. The slope of the parking lot is 0.0002. Estimate the flow rate and the maximum shear stress. Is a laminar flow assumption reasonable?

2. Water at 20-C flows between two parallel horizontal plates separated by a distance of 8 mm. The lower plate is stationary and the upper plate moves at 4 m=s to the right. Assuming a laminar flow, what pressure gradient is needed such that:

(a) The shear stress at the upper plate is zero

(b) The shear stress at the lower plate is zero

(c) The flow rate is zero

(d) The velocity at y ¼ 4 mm is 4 m=s