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unit for voltage
volt (joule/coulomb) or kg-m2/A-s3
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formula for electric potential (V) given a (q) at distance (r)
V=kq/r
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formula for electric potential energy (U)?
U=qV
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unit for magnetic field
- Tesla or Gauss
- 1 Tesla =104 Gauss
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formula for force on moving charge particle in a magnetic field?
- F=qvBsin()B- magnetic field
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unit of current
Ampere (1 Coulomb/sec)
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formula for current (I)
I=q/t
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formula for force on a current carrying wire in the presence of a magnetic field
F=iLBsin()
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formula for magnetic field created by long straight wire
B=(permeability of free space)(current)/(2pi)(distance from wire)=uoi/2pir
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formula for magnetic field at enter of loop or wire
B=uoi/r
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formula for electric power
P=iV=i2R=V2/R
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formula for R in series circuit
Rs=R1+R2+R3...
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formula for R in parallel circuit
1/Rp=1/R1+1/R2+1/R3
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formula for capacitance
C=(charge stored on the plate)Q/(potential difference btwn plates)V
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unit for capacitance
Farad (Coulomb/Volt)
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formula for electric field btwn the plates of capacitor
- E=potential difference btwn plates/distance of plates
- =V/d
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for AC current, formula for Irms, for Vrms
Irms=Imax/sqrt 2
Vrms=Vmax/sqrt 2
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formula for Hooke's law (for springs)
F=-spring constant/displacement=-kx
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formula for angular frequency of a mass on a spring and of a pendulum (simple harmonic motion)?
spring- f=sqrt(k/m)
pendulum- f=sqrt(g/L)
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formula for simple harmonic motion kinetic energy and potential energy
KE=mv 2/2
- Uspring=kx2/2
- Upendulum=mgh
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for simple harmonic motion, when is kinetic energy greatest, when is potential energy the greatest?
- KE at equilibrium point
- U at max displacement
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formula for a period of a mass on as spring and on of a pendulum
- period spring=2pi sqrt(m/k)
- period pendulum=2pi sqrt(L/g)
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describe particle oscillation in transverse wave, in longitudinal wave
trans wave- oscillate perpendicular to wave
long wave- oscillate along the direction of wave
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formula for velocity of wave
v=freq*wave length
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whats a node and anti-node in a wave
- node r points that remains at rest
- anti-node r the points at max amptitude
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formula for sound intensity
power/area
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(t/f)higher harmonics of standing wave in open pipes have higher wave speed than lower harmonics
false, all harmonics have same wave speed
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how are focal length and radius of curvature related?
- focal length=radius of curvature/2
- f=r/2
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formula for object distance (o), image (distance), and focal length (f)
1/f=1/o+1/i=2/r
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