Exam 4: Physics of Matter

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An atomizer works because of __________ principle.

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A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow is __________ psi.

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The uncharged particle inside an atom is a neutron.

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An atomizer works because of Bernoulli's principle.

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A plasma state of matter is

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The four states of matter are __________, __________, __________, and __________.

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Most modern aircraft use hydraulics systems to move the control surfaces on the aircraft.  This is an example of using Bernoulli's principle.

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The pressure exerted by a gas is the result of __________.

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Atmospheric pressure at an altitude of 10,000 m is exactly half of what it is at 5,000 m.

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You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm. The force on your left palm is twice than the force on your right palm.

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When an object floats in a liquid, the buoyant force is __________ the weight of the liquid displaced by the object.

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As a pressurized aircraft gains altitude, the force acting on the boarding door due to the difference between the outside air pressure and the pressure inside the aircraft _____________ with height

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Water is flowing through a pipe whose cross-sectional area at point A is larger than the cross-sectional area at point B . The reading on a pressure gauge connected to the pipe at point A will be _____________ the reading on a pressure gauge connected to the pipe at point B .

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The brakes in a car work because of __________ principle.

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A person weighing 180 pounds stands on snowshoes. If the total area of the 2 snowshoes is 900 square inches, what is the pressure on the snow?

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The upward force exerted by a fluid on an object immersed in it is called __________.

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Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A 1 is 1 square inch, and the area A 2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown. Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A <sub>1</sub> is 1 square inch, and the area A <sub>2</sub> is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown.    The force F <sub>2</sub> needed to keep piston 2 in place is 40 pounds. The force F 2 needed to keep piston 2 in place is 40 pounds.

(True/False)
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The brakes in a car work because of Pascal's principle.

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You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm. The force on your left palm is __________ the force on your right palm.

(Short Answer)
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Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A 1 is 1 square inch, and the area A 2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown. Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A <sub>1 </sub>is 1 square inch, and the area A <sub>2</sub> is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown.    The pressure on A <sub>2</sub> is 40 psi. The pressure on A 2 is 40 psi.

(True/False)
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