19. Fluid Mechanics

(II) The specific gravity of ice is 0.917, whereas that of seawater is 1.025. What percent of an iceberg is above the surface of the water?

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?

A 0.48-kg piece of wood floats in water but is found to sink in alcohol (SG = 0.79), in which it has an apparent mass of 0.047 kg. What is the SG of the wood?

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?