Physics Flashcards by Sarah E

Q

Pressure

A

pressure = force / area

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Q

Absolute pressure

A

absolute pressure = gauge pressure + atmospheric pressure

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Q

Hagen-Poiseuille

A

Q = πPr4 / 8nl

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Q

Reynolds number

A

pvd / n (dvd= density/velocity/diameter divided by viscosity)

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Q

turbulent flow

A

Q ∞ √P (pressure)

Q ∞ 1/ √l

Q ∞ 1/ √p (density)

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Q

Bernoulli’s equation

A

1/2 pv2 + P = K

P=potential energy

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Q

Gas laws

A

Boyles law: PV =K

Charles law V/T =K

3rd law P/T= K

PV = nRT

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Q

Ohms law

A

V = IR

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Q

Power (watts)

A

VI =I2 R

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Q

Charge

A

measured in Coulombs

Q = A x s

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Q

Capacitance

A

C = Q / V

measured in Farads

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Q

Defibrilator

A

1/2 CV2

E=1/2 QV

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Q

Parallel

A

1/Rt = 1/R1 + 1/R2

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Q

Series

A

Rt = R1 + R2

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Q

Wheatstone bridge

A

R1 / R2 = R3 / R4

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Q

Tension

A

t= tension
r=radius
P= pressure gradient

tube:
P = T/r

sphere: P= 2T/r

Q

Work

A

work done = force x distance

Q

Humidity

A

relative humidity = actual vapour pressure / SVP

Q

Linear function

A

y = Mx + C