Momentum
Fluid Systems
Electrical Systems
Electric-Magnetic Systems
Machines
Miscellaneous
100
Two bumper cars collide at an amusement park. After the collision, they bounce away from each other instead of sticking together. What is conserved; momentum and/or kinetic energy? Is this collision elastic or inelastic?
Momentum AND Kinetic Energy is Conserved.
Elastic collision.
100
Which statement best describes the difference between an incompressible fluid and a compressible fluid?
A. Incompressible fluids have no mass, while a compressible fluid has mass.
B. Incompressible fluids keep the same density under pressure, while a compressible fluid can change density significantly.
C. Incompressible fluids cannot flow, while a compressible fluid can flow.
D. Incompressible fluids are always gases, while a compressible fluid is always a liquid.
E. Incompressible fluids have no pressure, while a compressible fluid has pressure.
B. Incompressible fluids keep the same density under pressure, while a compressible fluid can change density significantly.
100
A phone charger transfers electrical energy to a phone battery. Which unit describes the rate electrical energy is being transferred?
A. Coulomb
B. Farad
C. Watt
D. Weber
E. Joule
F. Newton per Coulomb
G. Volt
H. Henry
I. Gauss
C. Watt
100
An MRI (Magnetic Resonance Imaging) uses powerful magnetic fields. Which unit is commonly used to measure the strength of a magnetic field?
A. Joule
B. Henry
C. Newton
D. Farad
E. Tesla
F. Pascal
G. Weber
E. Tesla
100
A child uses a playground seesaw to life a friend into the air. Which simple machine is the seesaw an example of?
Lever
100
A person says, "I always lie." Is this statement true, false, or a paradox?
Paradox
200
A skateboarder with a mass of 60.0 kg is rolling East at 4.00 m/s. What is the skateboarder's momentum?
240 kg m/s @ East
240 N s @ East
200
A submarine uses small underwater "wings" called dive planes to help it move up or down. A submarine captain wants the submarine to dive, and orders the dive planes to be tilted in such a way that:
A. There is an equal water speed above and below the dive planes.
B. No water moving around the dive planes.
C. Faster moving water above the dive planes.
D. Faster moving water below the dive planes.
E. Compressing the water above the dive planes.
F. Compressing the water below the dive planes.
D. Faster moving water below the dive planes.
200
A portable speaker uses two capacitors connected in parallel to help smooth the power going to its electronics. If one capacitor has a capacitance of 20 microF and the other has a capacitance of 30 microF, what is the total capacitance of the circuit?
50 microF
200
An electromagnet at a recycling center is used to pick up scrap steel. If the electromagnet's core is made from a material with higher magnetic permeability, what happens to the magnetic field produced by the electromagnet?
A. The magnetic field becomes stronger.
B. The magnetic field becomes weaker.
C. The magnetic field disappears.
D. The magnetic field reverses polarity.
E. The current turns into voltage.
F. The current reverses direction.
G. The electromagnetic becomes a capacitor.
A. The magnetic field becomes stronger.
200
A worker uses a 4.00 m long ramp to roll a heavy cooler onto a platform that is 1.00 m high. What is the ideal mechanical advantage of the ramp?
4.00
200
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.
300
During a downhill soapbox derby race, a homemade cart weighs 193 lb and is rolling North at 22.0 ft/s. What is the cart's linear momentum? (Note: g = 32.2 ft/s^2)
132 slug ft/s @ North
132 lb s @ North
300
What happens next?
300
A student builds a simple touch sensor using two flat metal plates separated by a thin insulating layer. What can the student do to increase the capacitance of the sensor?
A. Increase the plate area
B. Increase the distance between the plates
C. Remove the dielectric material between the plates
D. Decrease the electric permittivity between the plates
e. Make the plates smaller
A. Increase the plate area
300
An electron is moving away from the observer (you). Select the two correct answers:
A. Electric Field lines are going out of the electron.
B. Electric Field lines are going into the electron.
C. Electric Field lines are going clockwise around the electron.
D. Electric Field Lines are going counter-clockwise around the electron.
E. Magnetic Field lines are going out of the electron.
F. Magnetic Field lines are going into the electron.
G. Magnetic Field lines are going clockwise around the electron.
H. Magnetic Field Lines are going counter-clockwise around the electron.
B and H
300
A pizza cutter, representing a wheel and axle simple machine, has a wheel radius of 5.00 cm and an axle radius of 0.500 cm. If the efficiency of the pizza cutter is 90%, what is the actual mechanical advantage of the pizza cutter?
9
300
Name all the planets in our solar system in order from those closest to the sun to those furthest away from the sun.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
400
At an ice rink, a 75.0 kg skater glides West at 3.00 m/s and gently bumps into a 50.0 kg skater who is standing still. After the collision, they hold onto each other and slide together. What is their final velocity?
1.80 m/s @ West
400
A small food truck uses a hydraulic lift to raise a heavy serving window. The hydraulic pump creates a pressure difference of 850,000 Pa and pushes fluid through the system at a volume flow rate of 0.00250 m^3/s. How much fluid power is delivered by the pump in Watts?
2,130 Watts
400
A small electric scooter light runs on a 24.0 V battery and draws a current of 1.50 A. If the light runs for 5.00 minutes, how much electric energy is used up in Joules?
1.08 x 10^5 Joules
108,000 Joules
400
A bicycle-powered generator is used at a street festival to power decorative lights. The rider provides 250 W of mechanical input power, and the generator produces an electric potential difference of 17.5V and output current of 10A. What is the efficiency of the generator?
0.7 or 70%
400
At a community theater, a stage crew uses a pulley system to life a large prop dragon. The prop weighs 600 N. The crew pulls downward with an effot force of 150 N. There are 5 pulleys in the pulley system. What is the efficiency of the system?
0.8 or 80%
400
Name all three countries that share a land border with Finland?
Russia, Sweden, Norway
500
In a baseball game, a pitcher throws a fastball at 129 ft/s (88.0 mph). The baseball has a mass of 0.0097 slugs. The batter hits the ball straight back toward center field at 139 ft/s (about 95.0 mph). The bat is in contact with the ball for 0.0012 s. What is the average force exerted on the baseball by the bat?
2,170 lbs towards center field
500
At a water park, water flows through a pipe feeding a giant spash bucket. At a lower section of the pipe, the water pressure is 250,000 Pa and the water spped is 2.00 m/s. Higher up, the pipe is 5.00 m above the lower section, and the water spped has increased to 6.00 m/s. Assume the water is incompressible, and the density of water is 1000 kg/m^3. What is the water pressure in the higher section of the pipe?
183,000 Pa
500
A science museum display uses two capacitors connected in series across an 18.0 V battery. The capacitors are C1 = 7.00 microF and C2 = 3 microF. What is the total capacitance of the circuit? What is the voltage drop across each capacitor?
Total Capacitance = 2.1 microF
V1 = 5.4 V, V2 = 12.6 V
500
A wire inside an electric motor is carrying 8.00 A of current through a 0.250 m length of wire. The current is flowing from left to right. The wire is perpendicular, or 90 degrees, to a magnetic field of 0.600 T that is generated by a north pole above the wire and a south pole below the wire. What is the magnitude and direction of magnetic force that acts on the wire?
1.20 N going out of the board (towards you).
500
A large jar lid works like a screw. The edge of the lid has a radius of 4.00 cm. For each full turn, the lid moves upward by 0.200 cm. The jar lid is only 40.0% efficient because of friction between the lid and the jar. If an output force of 1,500 N is needed to open the jar lid, how much input force must a person apply on the edge of the lid to open the jar?
29.8 N
500
What is Matti's spirit animal?
Camel