Which of the following statements is true?

during heat flow, much of the energy is lost

during heat flow, energy is converted to matter

during heat flow, much of the energy is dissipated and cannot be used for useful work

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

Most short-period comets do not have randomly oriented orbits because

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?