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Exam 4: Physics of Matter

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Question 21

Multiple Choice

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The nucleus of an atom contains

A) protons.
B) neutrons.
C) electrons.
D) all of the above.

E) None of the above
F) A) and B)

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Question 22

True/False

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When a 4-cubic-ft block of wood floats in a fluid whose weight density is 60 pounds per cubic foot,3/4 of the block's volume is submerged.The buoyant force on the block is 60 pounds.

A) True
B) False

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Question 23

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A rectangular stack of lead bricks measures 2 m by 3 m by 4 m.The mass density of lead is 11,340 kilograms per cubic meter.What is the total mass of the stack of lead?

The brakes in a car work because of Pascal's principle.

Two pistons push down on the fluid filling two cylinders connected by a narrow hose,as shown in the figure.The area A₁ is 1 square inch,and the area A₂ is 10 square inches.A force of 4 pounds is exerted downward on piston 1,as shown. -The pressure on A₁ in psi is

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 pressure on your left palm is ____________ the pressure on your right palm.

A submarine dives to a depth of 50 meters in the ocean. (a)What is the gauge pressure at this depth? (b)What is the force acting on a hatch that has an area of 2.5 square meters?

The ratio of the density of a material to the density of water is

An ionized gas is called a plasma.

The molecule is the basic unit of all

The gauge pressure of the water in a swimming pool at 10 ft is ____________ the gauge pressure of the water at 5 ft.

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 lower than the reading on a pressure gauge connected to the pipe at point B.

The ratio of the density of a material to the density of water is the __________.

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

Two inflated balloons are of identical size and shape,but one is filled with hydrogen,the other helium.Which has the larger buoyant force on it?

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

The absolute pressure depends on

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?

The gauge pressure of the water in a swimming pool at 10 ft is __________ the gauge pressure of the water at 5 ft.

The central core inside an atom is