Write a function {position xs y} that returns the first position of y in the list xs. the positions in a list start with 1. for example, {position [a b c] c} returns 3 and {position [a b c b] b} returns 2. try two versions: 1) one that assumes that y is an element of xs and 2) one that returns 0, if y does not occur in xs

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?