An elastic spring (R) of negligible mass and stiffness k = 100 N/m and of unjointturns lies in the vertical plane and carries at its lower extremity a solid (S) of mass m = 500 g. g = 10 m/s2. 1) Calculate at equilibrium, the elongation of the spring and deduce its elastic potential energy.
2) Let O be the position of the center of (S) at equilibrium. Take the zero reference of gravitational potential energy as the horizontal plane passing through O. We displace (S) from its equilibrium position at O vertically downwards by a distance5 cm. Calculate the potential energy of the system [Earth; (R); (S)].

Write the correct abbreviation for each metric unit

In a system, when potential energy decreases, then entropy also decreases. true false

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.