Equations U2 Flashcards by Ryan Ferris

Q

Force in gravitational field

A

F = mg

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Q

Newtons law of universal gravitation eqn (2 point masses)

A

F = GMm/r^2

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Q

Newtons law of universal gravitation eqn (2 point masses) for g

A

g = GM/r^2

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Q

Kepler’s 3rd law

A

T^2 = (4pi^2/GM) r^3

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Q

Electric field strength

A

E = F/Q

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Q

Coulomb’s Law eqn

A

F = kQq/r^2

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Q

Electric field strength by point charge

A

E = kQ/r^2

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Q

Uniform electric field strength

A

E = v/d

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Q

Capacitance

A

C = Q/V

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Q

Energy supplied while charging capacitor

A

E = QV

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Q

Energy stored in a capacitor

A

E = 1/2QV

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Q

Energy stored in a capacitor (other equations)

A

E = 1/2Q^2/C

E = 1/2CV^2

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Q

Charge in parallel (capacitance)

A

Q(T) = Q1 + Q2 + Q3…

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Q

Capacitance in parallel

A

C(T) = C1 + C2 + C3

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Q

Current (Capacitor circuit resistor section)

A

I = V(R) / R

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Q

Exponential current decay

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A

/\Q/Q = -/\t/CR

Q

Capacitance log eqns

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A

I = I(o)e^-t/RC

Q = Q(o)e^-t/RC

V = V(o)e^-t/RC

Q

Force on a current carrying wire in a magnetic field

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A

F =BIL

Q

Magnetic Flux

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A

Ø = BA

Q

Magnetic flux linkage

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A

NØ = NBA

Q

Induced emf

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A

E = -N/\Ø//\t

Q

Rotating coil in magnetic field

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A

E = BANw sinwt

Q

Rotating coil in mag field max E

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A

E = BANw

Q

Transformers (V & N)

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A

Vs/Vp = Ns/Np

Transformers (V & I)

Vp Ip = Vs Is

Electric field deflection

a = VQ/dm

Electric field deflection (y axis)

y = 1/2(VQ/dm)(X^2/V(H)^2) [y = 1/2at^2]

Loss in electrical potential energy

qV = 1/2mv^2

Charge moving perp to mag field at constant v

F =BQv

radius of deflection (r) and force relation

r = mv/BQ