When a rocket lifts off, it takes about 7 minutes (420 s) to reach orbital velocity. It does this at an acceleration of about 18.6 m/s2. What is the final velocity of the rocket?

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?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

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.