17-86. The 4-kg slender rod is initially supported horizontally by a spring at B and pin at A. Determine the angular acceleration of the rod and the acceleration of the rod's mass center at the instant the 100-N force is applied. 100 N 1.5 m 1.5 m A k = 20 N/m

A satellite similar to the Tethered Satellite in the figure below has a mass of 550 kg and is at the end of a 19.2 km long, 2.90 mm diameter cable with the tensile strength of steel.   (a)How much does the cable stretch (in m) if a 108 N force is exerted to pull the satellite in? (Assume the satellite and shuttle are at the same altitude above the Earth. Young's modulus for steel is 210 ✕ 109 N/m2.) m   (b)What is the effective force constant of the cable (in N/m)? N/m   (c)How much energy (in J) is stored in it when stretched by the 108 N force? J