1- What the relation ship between temperature and density of liquids? 2- What are the factors that affect a simple pendulum experiment?

3- whats application of a simple pendulum experiment in medical sciences?

4- What application of density of liquid experiment in medical sciences?

​ Please i need answers before 25May

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up