Fundamentals of Physics Exam 3 | Complete Solutions (Verified)

Fundamentals of Physics Exam 3 | Complete Solutions (Verified)
If you triple the diameter of a ball, the volume of the ball will be:
27x larger
Arches work well in construction because ________.
a. The entire structure is under tension
b. The entire structure is under compression
c. The compression and tension balance each other out.
If you have two differently-sized spheres of metal and they have the same mass, then
________.
a. The smaller sphere is denser
b. Their densities are proportional to their sizes
c. The larger sphere is denser
d. They have the same density as well
An elastic material is one that___.
a. Keeps its new shape once deformed
b. Bends at least somewhat before breaking
c. Is relatively easy to deform.
d. Returns to its original shape after being deformed.
Compared to smaller animals, larger animals have a ________.
a. similar ratio of surface area to weight
b. smaller ratio of surface area to weight
c. larger ratio of surface area to weight
d. The pressure under 100 feet of salt water is closest to ________.
The pressure under 100 ft of saltwater is closest to:
a. 45 PSI
b. 3 atm
c. 20,000 leagues
d. 400kPa
When a boat is floating in the water, ________.
a. the buoyant force is greater than the weight of the boat
b. the buoyant force equals the mass of the boat
c. the buoyant force equals the weight of the boat
d. the volume of displaced water equals the volume of the boat
Pressure can be increased by ________.
a. increasing the area or decreasing the force
b. taking more time to relax
c. raising both the force and the area by proportional amounts
d. increasing the force or decreasing the area
In a hydraulic press (hydraulic lever), if the force is multiplied by a factor of 20,
________.
a. the pressure is also multiplied by a factor of 20
b. the distance is divided by a factor of 20
c. the distance is also multiplied by a factor of 20
d. the product of force x distance is also multiplied by 20
If a tire pressure gauge reads 30 PSI, the actual absolute pressure in the tire is closest
to ________.
a. 150 kPa
b. 45 PSI
c. 90 mmHg
d. 15 PSI
If the pressure in a gas is multiplied by a factor of 6 and the temperature is multiplied by
a factor of 3, the volume of the gas will be ________ the original volume.
a. three times
b. twice
c. one half of
d. one third of
Bernoulli's Principle states that, as the velocity of a fluid increases, ________.
a. the temperature of the fluid will also increase
b. the volume of the fluid will decrease
c. the pressure in the fluid will decrease
d. the pressure in the fluid will also increase
In a plasma, the ________.
a. atoms are broken down into molecules
b. protons are separated from the neutrons
c. electrons are separated from the nuclei
d. isotopes are separated by charge
Ninety nine percent of our atmosphere is contained in a layer about ________ thick.
a. 30 miles
b. 10 miles
c. 40 miles
d. 20 miles
Density of atmosphere- KE of molecules= tend to disperse, while gravity pulls them
down near earth
Earth's atmosphere is composed primarily of ________.
78% Nitrogen
21% O
9% Ar
.04% CO2
Do all materials expand when heated?
No. One example is water
Compared to an increase in temperature of 20 Fahrenheit degrees, an increase in
temperature of 20 Celsius degrees is ________.
a. the same
b. smaller
c. larger
A material with a low specific heat will tend to ________.
a. cool down quickly but heat up slowly
b. heat up and cool down quickly
c. heat up quickly but cool down slowly
d. heat up and cool down slowly
Compared to a cup of hot coffee, a bathtub full of lukewarm water has ________.
a. lower internal energy and lower average molecular energy
b. higher average molecular energy but lower internal energy
c. higher internal energy but lower average molecular energy
d. higher internal energy and higher average molecular energy

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