If you swim beneath the surface in saltwater, will the pressure be greater than in fresh water at the same depth?

A $12-\mathrm{kg}$ piece of metal displaces $2 \mathrm{~L}$ of water when submerged. Show that its density is $6000 \mathrm{~kg} / \mathrm{m}^3$. How does this compare with the density of water?

A dike in Holland springs a leak through a hole of area $1 \mathrm{~cm}^2$ at a depth of $2 \mathrm{~m}$ below the water surface. With what force would a boy have to push on the hole with his thumb to stop the leak? Could he do it?

The number of protons in a neutral atom is balanced by an equal number of _____?

The mountains of the Himalayas are slightly less dense than the mantle material upon which they "float." Do you suppose that, like floating icebergs, they are deeper than they are high?

Suppose that you balance a $5-\mathrm{kg}$ ball on the tip of your finger, which has an area of $1 \mathrm{~cm}^2$. Show that the pressure on your finger is $50 \mathrm{~N} / \mathrm{cm}^2$, which is $500 \mathrm{kPa}$

A rectangular barge, 5 m long and 2 m wide, floats in freshwater. If the barge can only be pushed $15 \mathrm{~cm}$ deeper into the water before water overflows to sink it, how many $400-\mathrm{kg}$ horses can it carry?

How much force is needed to hold a nearly weightless but rigid 1-L carton beneath the surface of water?

A can of diet soda floats in water, whereas a can of regular soda sinks. Explain this phenomenon first in terms of density and then in terms of weight versus buoyant force.

Which has more mass: a liter of ice or a liter of water?

Which has more volume – a kilogram of lead or a kilogram of aluminum?

Which has more volume: a kilogram of gold or a kilogram of aluminum?

In a deep dive, a whale is appreciably compressed by the pressure of rhe surrounding water. What happens to rhe whale's density?

In a deep dive, a whale is appreciably compressed by the pressure of the surrounding water. What happens to the whale's density during the dive?