A ball is dropped from rest of the roof of a skyscraper from a height of 419.33 m off the ground, Neglecting air resistance, how long does it take in seconds for the ball to hit the ground? Round your answer to two decimal places,

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

Which of the following correctly describes the early view of catastrophism?

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.