Exam 4: Physics of Matter

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 __________.

A tire pressure gauge reads 30 psi when the atmospheric pressure is 14 psi. The net force on 2 square inches of the tire is __________.

When a liquid boils and changes to a gas, it is said to have undergone a change of ________.

The gauge pressure inside a pressure cooker is 13 psi. What is the net force on the lid of the pressure cooker if the lid's area is 110 square inches?

Normal atmospheric pressure is about __________.

In the chemical formula for water, H ₂O, what does the "2" mean?

A tire pressure gauge reads 30 psi when the atmospheric pressure is 14 psi. The net force on 2 square inches of the tire is

When you suck through a straw, the force that makes the liquid go up the straw is

The brakes in a car work because of

The positively charged particle inside an atom is

A device that measures absolute air pressure is called a

If the same-sized force is made to act over a smaller area, the pressure is

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

An ionized gas is called a plasma.

The cabin pressure of a passenger jet cruising at high altitude (30,000 ft) is about 1 atm. and the pressure outside is about 0.3 atm. What is the outward force acting on a door measuring 1 meter by 2 meters?  (Hint: convert metric to English units in this problem using the conversion factor m² to ft² in the Table of Conversion Factors)

A person weighing 200 pounds stands on snowshoes. If the area of each snowshoe is 400 square inches, the pressure on the snow is 0.25 psi.

When an object floats in a liquid, the buoyant force is ____________ the weight of the object.

The absolute pressure depends on

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. The pressure on A ₂ in psi is

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