A power cycle generates 450 kJ of work, with a heat input of 2000 kJ at 420 K, and a heat loss of 1600 kJ at 300 K. Determine whether such a cycle is in keeping with the first and second laws of thermodynamics, and if the cycle is internally reversible, irreversible, or impossible.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?