Ared cart with a mass of 67 kg and a speed of 5 m/s hits a stationary blue cart. if the impact is elastic and the cars are identical in mass, what is the speed of the blue car after the impact?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

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.

What causes the development of most clouds and precipitation in the atmosphere?