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Difference between Transverse and Longitudinal wave?
- Transverse are perpendicular
- Longitudinal are parallel
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What is the relationship of Intensity of sound source and distance of sound source
Drops off with square of distance
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What is the relationship of period and frequency
They are reciprocal of each other
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Why can you hear sound around a wall?
Diffraction allows the sound to bend
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Explain Resonance Frequency. Ex: 225hz
- Doubles the frequency before
- 225
- 450
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What type of waves are sound waves?
Longitudinal waves
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If one tuning fork has a freq of 440Hz and one w/ 444Hz striking at the same time, what do you hear?
Beats with a freq of 4Hz
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What happens to speed of sound as you increase temp?
Speed of sound increases (speed of sound = 331
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How much louder is 40dB than 20dB?
100 times (dB is log of 10)
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If the sound of a siren is coming towards you, what do you hear?
Higher frequency with shorter wave length
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What is the phenomenon of hearing a siren coming toward you?
Doppler effect
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Which coefficient of linear expansion will expand the most: .9, 3, 12, 28
28 because it is the highest
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If you double temp are pressure how does it change?
It doesn't change
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Patient is running a high fever of 40 degrees C, find in Kelvin.
K= C + 273.15
313.15K
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At 0 K, what is true about gas?
Volume is zero
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Diatomic Gas, such as O2 what kind of kinetic energy can it have?
Rotational, Vibrational, and Translational
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What is the main way earth loses heat?
Radiation
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What is internal energy and what is not?
Rotational, Kinetic plus Nuclear, Vibrational (movement of the system of a whole is not)
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If you had 10kg of brass, and you want to raise all temp from 273K --> 283K c=.384
- Q=mc/\T
- Q=(10)(10)(,384)=38.4kJ
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When you have a gas that changes back to liquid phase what is happening to internal energy, increasing or giving off?
Giving off energy (heating up to change solid->liquid->gas)
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Floor feels cold and rug feels warmer?
Tile is a good conductor of heat
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What is meant by triple point?
Solid, liquid, gas properties present, different for each substance
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Net charge of closed system does not change
Conservation of electric charge
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5 things about Electric Field lines
- 1) Always start at + ends on negative
- 2) More charge -> more field lines -> strong field
- 3) NO field inside a charged conductor
- 4) Field lines are always perpendicular to the surface of a charged object
- 5) Field lines are always closest together at point and edges
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SI of electric unit
Coulomb
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Tow charges distance is 1cm, if increase the distance to 4cm, by what factor does the force change?
Drops by 4 factor or 16
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Things about Static Equilibrium
- 1) The electric field inside a charge is always zero
- 2) When the conductor reaches equilibrium only the surface can have a net charge
- 3) The electric field at the surface of the conductor is perpendicular to the surface
- 4) The surface charge density charge per unit area on a conductor in electric equilibrium is higher at sharp point
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If you take cat fur and charge an object, and you hold this object near an uncharged object...
It will induce separation of charge causing a force of attraction (induction)
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Build veindigraph generator where is the safest place for command center?
In the center
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Electric Potential
Potential energy per unit charged
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Device that measure potential difference?
EGC machine
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What is a capacity made up of?
Two conductors separated by insulator (measured in Farads)
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If you are reading a charge in an equopotential...
No change in potential energy and requires no work
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Derived units for Volt
joules per coulomb
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Series and Parallel circuit figure resistance
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Of all the unit for electricity, which unit represents a rate?
Current = I + (C/s)
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Characteristics of resistance of wire
Resistivity, Thickness, length
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Which make better insulator and conductor
- High resistivity = insulator
- Low resistivity = conductor
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Power Derived
P=I/\V or P=I2V
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Magnetic Field lines and Electrical Field lines
- Magnetic field lines have N and S poles
- Electrical fields make a complete loop
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Shape that takes form around a straight wire
Concentric circles
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Magnetic field strength
T-N/Am
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Two wires carrying current when will they attract
Parallel will attract
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Cut bar magnet in half what do you get?
Two north and wound magnets
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Suppose you have a silonoid with an incoming wire with loops and an outgoing with loops how do you determine the current?
Right hand rule
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Produce of Magnetic field and area?
Magnetic Flux (measured in webers)
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Lenz's law?
Current induced, opposed force that produced it
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Farad's Law
Size of EMF is equal to rate of change of magnetic flux
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If a transformer has an input of 420V output of 20V
24V
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What kind of transform is this? Input of 420 and output of 20V
Step-down
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Why do power companies increase voltage of power cables?
To fight resistance
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