An eskimo pushes a loaded sled with a mass of 300kg over the frictionless surface of hard-packed snow. he exerts a constant 170n force as he dose so. what is the sled's acceleration?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

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.