Rates
Rate/Resistance
Resistance I
Resistance II
Energy I
Energy II
Miscellaneous
100
Label the direction of current (I) and the direction of electron flow.
100
A Reynold's number of 1500 implies ____ flow.
Laminar
100
The USC unit for coefficient of friction is ______.
dimensionless (no units)
100
Increasing the diameter of a pipe will _____ the fluid resistance through the pipe.
decrease
100
The S.I. unit for angular velocity is ____ .
Hz or s^(-1)
100
Which bobsled team will have the greatest velocity at the bottom of the hill, and which one will have the slowest velocity at the bottom of the hill? Assume friction on ice is negligible, and the mass between the teams are equal.
They all will have the same velocity at the bottom of the hill.
100
What is the name of the thought experiment involving a cat that is both dead and alive (aka exists in a superposition of multiple states until a measurement is made)?
Schroedinger's cat
200
How much charge in Coulombs flows through a wire in 10 seconds when a current of 3.5 A is present?
350 C
200
True of False: A car battery is a lead-sulfuric acid battery that provides AC power to the car.
False: A car battery provides DC power (its why the charging sockets in cars are different from households!)
200
Why does it take more force to get an object to start moving than it takes to keep the object moving along a surface?
At rest, the object experiences static friction, while in motion, the object experiences kinetic friction. The coefficient of static friction is higher than the coefficient of kinetic friction.
200
If the cross-sectional area of a material is increased, the thermal resistance of that material will ____ and the heat rate QH through the material will ____.
Decrease, Increase.
200
A spring with a spring constant of k=2 N/m is stretched out an extra 0.5 meters. What is the potential energy stored in the spring?
0.25 J
200
How many radians is 90 degrees?
pi/2 radians
200
Name all countries that have a land border with Finland.
Russia, Sweden, Norway
300
The period of a wave is T = 3.65 milliseconds. What is the frequency in Hz?
274 Hz
300
A heater delivers 400. BTU of heat every 2.00 minutes. Its heat flow rate is ____?
QH=200 BTU/min or QH=3.33 BTW/s
300
A football thrown at a certain velocity in the Denver Bronco's Stadium where the altitude is one mile above the sea level experiences more or less drag force than the same football thrown at that same velocity in the Seattle Seahawk's Stadium? Explain why.
Less drag force, because the density of air in Denver is less.
300
Given an 80.0 V DC source with a switch and four resistors in series: 4.00 Ohms, 6.00 Ohms, 16.0 Ohms, and 24.0 Ohms. Find the total current running through the circuit.
1.60 A
300
When the speed of a moving car changes from 20 mph to 60 mph, the kinetic energy of the car will
A. Remain constant since the car does not change height.
B. Increase to three times its original value.
C. Increase to six times its original value.
D. Increase to nine times its original value.
D. Increase to nine times its original value
300
List in order the different forms of energy that occur when a person turns on an incandescent lightbulb (from the energy inside the person all the way to the light in the room).
___ Energy --> ____ Energy --> etc...
Chemical Energy --> Mechanical Energy --> Electrical Energy --> Thermal Energy --> Electromagnetic (Radiant or Light) Energy
300
What are the three fundamental particles in an atom?
Electron, Up-quark, Down-quark.
Up-quarks and Down-quarks make up protons and neutrons.
400
The Great Pyramid of Giza is a square pyramid with a base side length of 750 feet and a height of 450 feet. What is the volume of the Great Pyramid of Giza?
84,375,000 ft^3
400
Using a running garden hose to water plants (treat water as an incompressible fluid), if one partially blocks the opening end of the garden hose to 1/3rd of its original cross-sectional area, the volume flow rate will increase/decrease by a factor of?
The volume flow rate does NOT change. (Increase/Decrease by a factor of 1).
400
A bowling ball weighs 5.00 kg and the coefficient of rolling friction between the bowling ball and the bowling lane is 0.00500. How much friction does a rolling bowling ball experience in Newtons?
Ffriction=0.245 N
400
What is the resistance of a 15.0-meter-long silver wire with a radius of 0.200 millimeters? The resistivity of silver is 1.58*10^(-8) Ohms*m.
1.89 Ohms.
400
A weightlifter lifts a 300. lb weight up 4.00 feet. If the weightlifter does 10 repetitions of this exercise, how many Calories do they burn? (1 ft*lb = 0.001356 Calories).
16.3 Calories
400
A 0.0025kg penny is dropped from the top of the Seattle Space Needle that is 184m high. Assuming no drag, what is the velocity of the penny right before it hits the ground?
60. m/s downwards
400
What musical instrument did Matti play during his time as a semi-professional musician?
Electric Cello
500
v2 = 10 m/s
500
H2O has very unique properties compared to other compounds that astrobiologists believe is necessary for life to exist. One of these unique properties described in class is its intermolecular interaction. Draw two H2O molecules and diagram/explain the intermolecular interaction that occurs.
A partial positive charge at the hydrogen ends, and a partial negative charge at the oxygen end, results in a dipole compound where those partial charges are attracted to the opposing partial charges of other nearby H2O molecules, leading "hydrogen bonds" that lend to water's special cohesive and adhesive properties.
500
A passenger plane has a wingspan of 36m, which is also its characteristics length. If the plane takes-off from SeaTac Airport with a takeoff velocity of 80 m/s, is it experiencing laminar, transitional, or turbulent airflow? The density of air is 1.225 kg/m^3 and the dynamic viscosity of air is 0.0000181 Pa*s.
Turbulent Flow (Reynold's number = 1.95*10^8)
500
A 12.0 V DC source is connected to two light bulbs that are connected in parallel. If one of the light bulbs has a resistance of 10.0 Ohms, and the total current through the entire circuit is 2.00 A, what is the resistance of the second light bulb?
15.0 Ohms
500
A 65.0 kg cart sits at the top of a hill. It coasts to the bottom of the hill that is 25.0 meters below. If 40.0% of the energy is lost due to friction, find the kinetic energy of the cart as it reaches the bottom of the hill.
Ek = 9560 J
500
The spherical Earth has a mass of m=5.972*10^24 kg and a radius of r=6.371*10^6 m. If the moment of inertia for a sphere is I=(2/5)mr^2, and the Earth makes one full rotation in a day, what is the rotational kinetic energy of Earth in units of Joules?
2.564*10^29 J
500
In parts of the world, there are regions the sun never rises during the winter (polar night), and never sets during the summer (midnight sun). Describe the physics behind this phenomenon.
The Earth spins on an axis that is tilted approximately 23.5 degrees, which results in different parts of the planet receiving varying amounts of sunlight leading to seasons. This tilt causes those polar regions to be much more exposed to sunshine during summer months when the pole is tilted towards the sun, and extended darkness during winter months when the pole is tilted away from the sun.