A spring has a stretched length of 3.57 m, a relaxed length of 2.45 m, and a spring constant of 5.2 N/m. What is its elastic potential energy?
What is the tension produced in two wires of the same length if one wire of brass and another of steel support a horizontal in s = 1.5 m, Y (steel) = 2 × 1011 Nm–2, Y (brass) = 1 × 1011 Nm–2, area of cross sections a (steel) = 1 × 10–5 m2, a (brass) = 2 × 10–5 m2?