19. Fluid Mechanics

Why can some insects walk on water?

Why does hot air rise and cold air sink in Earth's atmosphere?

In the context of buoyancy, does the volume of an object alone determine whether it will float or sink in a fluid?

Which principle explains why certain insects can walk on water?

In a container of water, what typically happens to hot water compared to cold water, and why?

Why are some tiny insects able to walk on water?

Why does cool air sink in the atmosphere?

In the context of buoyancy, does the mass of an object alone determine whether it will float or sink in a fluid?

Which of the following statements best explains why ice floats on water?

If your average density is $\rho$ and you are floating gently in freshwater with density $1000kg/m^3$, what fraction of your volume will be submerged?

Which of the following best explains Archimedes' principle?

A submarine is stranded on the bottom of the ocean. Which of the following statements best explains why the buoyant force acting on the submarine does not cause it to rise to the surface?

Why does a hot air balloon rise in the atmosphere?

If the entire apparatus is completely submerged in water, which of the following statements about the buoyant force acting on it is correct?

Why will a block of iron float in mercury but sink in water?