The extruded aluminum beam has a uniform wall thickness of 18 in. Knowing that the vertical shear in the beam is 1.6 kips, determine the corresponding shearing stress at each of the five points indicated. When there is a discontinuity in the thickness of the cross section, select the smaller of the two thicknesses.(Round the final answers to two decimal places.)

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?