Fundamentals of Physics Exam 3
If you triple the diameter of a ball, the volume of the ball will be:
27x larger
Arches work well in construction because ________.
- The entire structure is under tension
- The entire structure is under compression
- The compression and tension balance each other out.
If you have two differently-sized spheres of metal and they have the same mass, then
________.
- The smaller sphere is denser
- Their densities are proportional to their sizes
- The larger sphere is denser
- They have the same density as well
An elastic material is one that___.
- Keeps its new shape once deformed
- Bends at least somewhat before breaking
- Is relatively easy to deform.
- Returns to its original shape after being deformed.
Compared to smaller animals, larger animals have a ________.
- similar ratio of surface area to weight
- smaller ratio of surface area to weight
- larger ratio of surface area to weight
- The pressure under 100 feet of salt water is closest to ________.
The pressure under 100 ft of saltwater is closest to:
- 45 PSI
- 3 atm
- 20,000 leagues
- 400kPa
When a boat is floating in the water, ________.
- the buoyant force is greater than the weight of the boat
- the buoyant force equals the mass of the boat
- the buoyant force equals the weight of the boat
- the volume of displaced water equals the volume of the boat
Pressure can be increased by ________.
- increasing the area or decreasing the force
- taking more time to relax
- raising both the force and the area by proportional amounts
- increasing the force or decreasing the area
In a hydraulic press (hydraulic lever), if the force is multiplied by a factor of 20,
________.
- the pressure is also multiplied by a factor of 20
- the distance is divided by a factor of 20
- the distance is also multiplied by a factor of 20
- 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 ________.
- 150 kPa
- 45 PSI
- 90 mmHg
- 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.
- three times
- twice
- one half of
- one third of
Bernoulli's Principle states that, as the velocity of a fluid increases, ________.
- the temperature of the fluid will also increase
- the volume of the fluid will decrease
- the pressure in the fluid will decrease
- the pressure in the fluid will also increase
In a plasma, the ________.
- atoms are broken down into molecules
- protons are separated from the neutrons
- electrons are separated from the nuclei
- isotopes are separated by charge
Ninety nine percent of our atmosphere is contained in a layer about ________ thick.
- 30 miles
- 10 miles
- 40 miles
- 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 ________.
- the same
- smaller
- larger
A material with a low specific heat will tend to ________.
- cool down quickly but heat up slowly
- heat up and cool down quickly
- heat up quickly but cool down slowly
- heat up and cool down slowly
Compared to a cup of hot coffee, a bathtub full of lukewarm water has ________.
- lower internal energy and lower average molecular energy
- higher average molecular energy but lower internal energy
- higher internal energy but lower average molecular energy
- higher internal energy and higher average molecular energy
internal energy= sum of all energies- bigger = more- KE, PE, etc.molecular is heat energy, average speed of molecules
Heat is defined as ________.the flow of energy from a higher temperature object to a lower temperature object
The lower the temperature of an object, the ________ the wavelength of electromagnetic radiation it emits Longer
If a window is perfectly sealed (no air leaks), heat can still penetrate via ________.conduction and EM radiation
If you touch a wooden pencil and a metal pen that have both been sitting on your desk, the pen feels cooler because ________.the metal is a better heat conductor than wood
The longer the wavelength of electromagnetic radiation, the ________ the frequency.lower higher frequency = shorter wavelength
Global warming due to the Greenhouse Effect ________ .
- was first discovered by Al Gore in the early 1970's
- is a Chinese hoax designed to take away our jobs
- may actually be due to ash and other contaminants from volcanos
- can happen on any planet with an atmosphere
When water vapor condenses into liquid water, it ________.
- must pass through a solid phase
- transfers heat to the liquid water with no net heat flow to the environment
- absorbs heat from the environment
- releases heat to the environment
Clouds and fog are caused by ________.
- evaporating liquid water
- burning too many fossil fuels
- condensing water vapor
- vapor deposition in the atmosphere
In a standard air conditioner or heat pump, the refrigerant ________ outside and ________ inside.condenses, evaporates
