Question

.. .. .......... ............................................................................. LEARN MORE REMARKS Because a force on the eardrum of this magnitude is uncomfortable, swimmers often "pop their ears" by swallowing or expanding their jaws while underwater, an action that pushes air from the lungs into the middle ear. Using this technique equalizes the pressure on the two sides of the eardrum and relieves the discomfort. 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 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 let air flow in as liquid is poured out to allow evaporation to allow the user to check the liquid level PRACTICE IT Use the worked example above to help you solve this problem. 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 5.7 m deep. EXERCISE HINTS: GETTING STARTED I I'M STUCK! An airplane takes off at sea level and climbs to a height of 430 m. Estimate the net outward force on a passenger's eardrum assuming the density of air is approximately constant at 1.3 kg/m and that the Inner ear pressure hasn't been equalized. Need Help? Read It Talk to. Tutor

Answer 1

A)

Pressure, P = 1000 x 9.8 x 5.7 = 55860 Pa

Force, F = 55860 x 10^-4 = 5.59 N

B)

Pressure, P = 1.3 x 9.8 x 430 = 5478.2 Pa

Force, F = PA = 5478.2 x 10^-4 = 0.548 N

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