19. Fluid Mechanics

An 8,000 cm³ block of wood is fully immersed in a deep water tank, then tied to the bottom. When the block is released and reaches equilibrium, you measure the tension on the string to be 12 N. What is the density of the wood?

You are docking your boat and the current is pushing you toward the dock. What is the best way to dock?

A solid ball of volume $V$ and density less than that of water is floating on the surface of water. How much force must be applied downward to just submerge the ball completely under water?

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

Why do hot air balloons rise in the atmosphere?

How do water striding insects manage to walk on the surface of $\mathrm{water}$?

Does the volume of an object alone determine whether it will float or sink in a fluid?

If an object in water weighs less than $m\_\mathrm{water}$ that it displaces, what will happen to the object?

The rock pumice often floats on water even though its density is greater than that of water. Which of the following best explains why pumice can float?

How can weather conditions affect the ability of hot air balloons to float?

When a thin glass rod is completely submerged in oil and released, what determines whether it will sink, float, or remain suspended in the oil?

Why does an ocean liner float on water?

How is the density of a floating object ($\rho$) related to the density of the fluid (${\rho }_{\mathrm{fluid}}$) it is floating in?

What causes a water strider to be able to walk on water?

Which of the following best explains why a small coin can sometimes float on top of the water in a glass, even though its $d>d_{\mathrm{water}}$?