# CFI Physics Exam 2

 The flashcards below were created by user BrettIRB on FreezingBlue Flashcards. Difference between Transverse and Longitudinal wave? Transverse are perpendicularLongitudinal are parallel What is the relationship of Intensity of sound source and distance of sound source Drops off with square of distance What is the relationship of period and frequency They are reciprocal of each other Why can you hear sound around a wall? Diffraction allows the sound to bend Explain Resonance Frequency. Ex: 225hz Doubles the frequency before225450 What type of waves are sound waves? Longitudinal waves 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 What happens to speed of sound as you increase temp? Speed of sound increases (speed of sound = 331 How much louder is 40dB than 20dB? 100 times (dB is log of 10) If the sound of a siren is coming towards you, what do you hear? Higher frequency with shorter wave length What is the phenomenon of hearing a siren coming toward you? Doppler effect Which coefficient of linear expansion will expand the most: .9, 3, 12, 28 28 because it is the highest If you double temp are pressure how does it change? It doesn't change Patient is running a high fever of 40 degrees C, find in Kelvin. K= C + 273.15 313.15K At 0 K, what is true about gas? Volume is zero Diatomic Gas, such as O2 what kind of kinetic energy can it have? Rotational, Vibrational, and Translational What is the main way earth loses heat? Radiation What is internal energy and what is not? Rotational, Kinetic plus Nuclear, Vibrational (movement of the system of a whole is not) If you had 10kg of brass, and you want to raise all temp from 273K --> 283K c=.384 Q=mc/\TQ=(10)(10)(,384)=38.4kJ 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) Floor feels cold and rug feels warmer? Tile is a good conductor of heat What is meant by triple point? Solid, liquid, gas properties present, different for each substance Net charge of closed system does not change Conservation of electric charge 5 things about Electric Field lines 1) Always start at + ends on negative2) More charge -> more field lines -> strong field3) NO field inside a charged conductor4) Field lines are always perpendicular to the surface of a charged object5) Field lines are always closest together at point and edges SI of electric unit Coulomb Tow charges distance is 1cm, if increase the distance to 4cm, by what factor does the force change? Drops by 4 factor or 16 Things about Static Equilibrium 1) The electric field inside a charge is always zero2) When the conductor reaches equilibrium only the surface can have a net charge3) The electric field at the surface of the conductor is perpendicular to the surface4) The surface charge density charge per unit area on a conductor in electric equilibrium is higher at sharp point 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) Build veindigraph generator where is the safest place for command center? In the center Electric Potential Potential energy per unit charged Device that measure potential difference? EGC machine What is a capacity made up of? Two conductors separated by insulator (measured in Farads) If you are reading a charge in an equopotential... No change in potential energy and requires no work Derived units for Volt joules per coulomb Series and Parallel circuit figure resistance SeriesR=R1 + R2 + R3.... Parallel1/R= 1/R1 + 1/R2 Of all the unit for electricity, which unit represents a rate? Current = I + (C/s) Characteristics of resistance of wire Resistivity, Thickness, length Which make better insulator and conductor High resistivity = insulatorLow resistivity = conductor Power Derived P=I/\V or P=I2V Magnetic Field lines and Electrical Field lines Magnetic field lines have N and S polesElectrical fields make a complete loop Shape that takes form around a straight wire Concentric circles Magnetic field strength T-N/Am Two wires carrying current when will they attract Parallel will attract Cut bar magnet in half what do you get? Two north and wound magnets 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 Produce of Magnetic field and area? Magnetic Flux (measured in webers) Lenz's law? Current induced, opposed force that produced it Farad's Law Size of EMF is equal to rate of change of magnetic flux If a transformer has an input of 420V output of 20V 24V What kind of transform is this? Input of 420 and output of 20V Step-down Why do power companies increase voltage of power cables? To fight resistance AuthorBrettIRB ID68495 Card SetCFI Physics Exam 2 DescriptionCFI Physics Exam 2 Updated2011-02-24T00:33:40Z Show Answers