A 1500 kg rollercoaster starts at the top of a frictionless hill with 200,000 J of gravitational potential energy and 50,000 J of kinetic energy. As the rollercoaster reaches the bottom of the hill, it now has 220,000 J of kinetic energy. Calculate the gravitational potential energy of the rollercoaster at the bottom of the hill.

Astate of matter all that has define volume and can flow is a(n)

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.