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53 Cards in this Set
- Front
- Back
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what is the equation for specific gravity
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density of substance/density of water
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what is the density of water
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1000 kgm/mcube
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how can you tell right away if a grpah is of proportion?
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if it does not go through the origin then it is not a graph of proportion
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you have two points that are in large glass tanks of water. they are both at the same depth. what is true of the pressure
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pressure is the same at all one depth
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if you have a wooden block in the bottom of a tank of water, is the top or bottom of the block at higher pressure or are they the same
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the bottom of the block is at higher pressure because it is deeper
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archimedes principle states that the magnitude of buoyant force is equal to....
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the weight of the fluid displaced by the object
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Fbuoy =
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pVg
where p is density |
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is densityobject < densityfluid, will it float or sink
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float
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if the obejct floates, the gractionof its volume that is submerged is the same as...
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the ratio of its density to the fluids density
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when would an object "hover" in a glass of liquid
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if its density is the same
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the pressure is (lower or higher?) where the speed is faster
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FAST = low pressure
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stress =
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force/area
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e (elementary charge) =
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1.6 x 10^-19 C
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q (charge) =
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ne
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if you multiply exponents do you add or subtract them
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add
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how much positive charge is contained in one mole do carbon atoms?
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1 mol = 6 protons
1 mol = 6 x 10^23 so q=ne q = (6)(6 x 10^23)(1.6 x 10^-19) |
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coulombs law F =
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kq1q2/r^2
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coulombs constant kx=
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9 x 10^9
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electric force and field Fonq =
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qE
E is electric field |
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E (electric field) =
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kQ/r^2
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is a dielectric an insulator or a conductor
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insulator
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change in electrical potential changePE =
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qchangephi = qV
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do protons normally rise to higher potential or fall to normal potential
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think like protons are heavy
protons naturally fall to positive charges at lower potentials |
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in order for there to be current there must be....
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net movement of electrons
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I =
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Q/t
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Q =
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ne
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R (resistance) =
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V/I
I kinda like V = IR |
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R (resistance and resistivity) =
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pL/A
p is resistivity |
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how do you calculate resistors in series
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add them R1+R2...etc
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how do you calculate resistors in parallel
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1/R = 1/R1 + 1/R2 etc
easier calculation for RxR/R+R |
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is the longer line of the battery positive or negative
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longer is positive
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which way does current flow in a circuit
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away from the positive to the negative
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do resistors in series have the same current or different
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same current
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do resistors in parallel have the same voltage or different
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same voltage but different current
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what is the equation for power dissipated by a resistor
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P = I^2R
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give the equation for power in terms of IV
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P = IV
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if you have resistors in series and the current is 1A what will the current be through the rest of the resistors
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1 A
resistors in series share the same current |
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if you have resistors in parallel and the current and R is given, how do you calculate current in the resistors not given
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first solve for V
then apply this to the specific resistor you are asking about |
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what is the equation for charge on a capacitor
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Q = CV
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V =
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Ed
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what is the equation for PE sotred in a capacitor PE =
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1/2QV
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definition. a slab of insulating material palced between the plates of a capacitor
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dielectric
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Cwith dielectric =
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KEo A/d
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is a dielectric good if it is insulating or conducting
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insulating. this allows the charges on the capacitor to stay separate and capacitor stays charged
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Capacitors in parallel=
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C + C + C
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capacitors in series=
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1/c 1/c 1/c
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Vrms =
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vmax/sqrt2
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what is the formula for magnetic force? Fb =
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q(vxB)
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what is the formula for the magnitude of magnetic force?
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Fb = qvBsintheta
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does a dot mean into or out of the page
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out of
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when do you use the right hand and left hand rule?
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right if q is positive
left if q is negative |
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what is the right hand rule
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thumb is v
fingers are B Fb is palm |
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qVB =
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mv^2/r
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