a block weighing 2,000 kn is pushed along a surface. a push force of 800 kn is required to just get the block moving and a push force of 600 kn is required to keep the block moving at a constant velocity. determine the coefficient of static friction between the block and the surface. determine the coefficient of kinetic friction between the block and the surface.

50.)the diagram below represents the wave fronts produced by a point source moving to the right in a uniformmedium. observers are located at points a and b. compared to the wave frequency and wavelength observed at point a, the wave observed at point b has a(1) higher frequency and a shorter wavelength(2) higher frequency and a longer wavelength(3) lower frequency and a shorter wavelength(4) lower frequency and a longer wavelength