If a star is 33.11 trillion kilometers away how much light years would that be

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules