A car of mass 1500 kg of moving at 20 m/s when a constant breaking force of 3000N is applied. How long does it take to stop the car?

What occurs during a combustion reaction

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

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.