An element for sensing local shear stress is positioned in a flat plate 1 meter from the leading edge. The element simply consists of a small plate 1 cm x 1 cm, mounted flush with the wall, and the shear force is measured on the plate. The fluid flowing by the plate is air with a free-stream velocity of 30 m/s, a density of 1.2 kg/m3 , and a kinematic viscosity 1.5·10-5 m2 /s. The boundary layer is tripped at the leading edge. What is the magnitude of the force due to shear stress acting on the element?

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

What was the first instrument to ever record an earthquake?

Earth's atmosphere is composed of mostly two gases. name the two gases that make up the majority of the atmosphere and use the pie chart to tell the percentages of each.