An 80 kg hockey player is skating at 4.1 m/s when an 85 kg hockey player from
another team, moving in the same direction at 5.5 m/s, hits him from behind. The
two becoming tangled up together and continue in a straight line. Find the
velocity of the two hockey players after they become attached.

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b.what is the wavelength of the wave? c.what is the amplitude of the magnetic field? d.what is the intensity of the wave?