Once a 22 kg crate is in motion on a horizontal floor, a horizontal force of 52 n keeps the crate moving with a constant velocity. the acceleration of gravity is 9.81 m/s 2 . what is µk, the coefficient of kinetic friction, between the crate and the floor?

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.