19. Fluid Mechanics

Why does warm air rise in the atmosphere according to the principle of buoyancy?

Which condition must be met for a balloon to float in air?

Why does a hot-air balloon rise in the atmosphere?

In a fluid of uniform density, does the magnitude of the $F$_b (buoyant force) acting on a fully submerged object increase as the object is placed deeper in the fluid?

Bridges and overpasses can be even more hazardous during cold weather because:

If the buoyant force exerted by water on a ball is greater than the weight of the ball, what will happen to the ball when it is fully submerged and released? ($F\_\mathrm{buoyant}>W$)

A solid block of volume $V$ is fully submerged in a liquid of density $\rho$. What is the buoyant force acting on the block?

A piece of wood is held completely submerged underwater by a rope attached to the bottom of a tank. Which of the following best describes the direction of the force that the rope exerts on the wood?

In a heavy rain, your tires can ride on a thin film of water, like skis. This is called $\_\_\_\_\_\_\_\_\_\_$.

Which of the following best explains why some objects float in water?

In which layer of Earth's atmosphere does a typical hot-air balloon travel?

When floating a ping-pong ball in the air stream of a hairdryer, which force primarily balances the gravitational force $F\_g$ acting on the ball to keep it suspended?

A blimp has a mass of $100$ tons. To float in air and remain neutrally buoyant (neither rising nor sinking), how much air must it displace? (Assume the density of air is $1.225\mathrm{kg}/m^3$ and $1$ ton = $1000$ kg.)

Which of the following statements best describes the forces acting on a barge floating in fresh water at rest?

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