Why do water containers and gas cans often have a second, smaller cap opposite t

Question

Why do water containers and gas cans often have a second, smaller cap opposite the spout through which the fluid is poured? (Select all that apply.) to allow evaporation to let air flow in as liquid is poured out To provide a second way to pour out the liquid to keep the space above the liquid at the same pressure as outside while pouring to allow the user to check the liquid level

Estimate the net force exerted on your eardrum due to the water above when you are swimming at the bottom of a pool that is 5.3 m deep? N

EXERCISE HINTS: GETTING STARTED | I'M STUCK! An airplane takes off at sea level and climbs to a height of 435 m. Estimate the net outward force on a passenger's eardrum assuming the density of air is approximately constant at 1.3 kg/m3 and that the inner ear pressure hasn't been equalized.

Explanation / Answer

Why do water containers and gas cans often have a second, smaller cap opposite the spout through which the fluid is poured?
Answer -

Pressure = [density of liquid] * [acceleration due to gravity] * [depth of column]
p = gh
p = 1.3kg/m³ * 9.8m/s² * 435m = 5542 Pa

Now, Pressure = Force/Area
Force = Presuure * Area
Force = 5542 *10^-4
Force = 0.55 N

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