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# Phys final

### I just want to pass the class

Question | Answer |
---|---|

FB = pgVdisplaced | buoyancy |

P = 2Y/r | pressure (employing surface tension) |

P = pgh | pressure |

ar = w^2 r | radial acceleration |

0 = 1/2 at^2 | angles and |

P + pgy + 1/2 pv^2 | bernoulli's |

F = (P1-P2) A F = 1/2 p(v2^2 - v1^2)A | another Bernoulli's I guess |

dP = pv^2/2 | change in pressure |

F = dP l w | surface area and pressure to find force |

F = nvA/L | finding force with viscosity, velocity, area, and length |

Q = dP/r | discharge with Pressure and radius |

Q = (pi d^2/4)v | flow rate with radius and velocity |

specific gravity | just compares the density of something to the density of water. so basically will it float? |

pascals principle | pressure anywhere at the same depth under the surface will be the same |

v = ∆x/∆t | find average velocity find change in distance find change in time |

a = ∆v/∆t | find acceleration find change in velocity find change in time |

v = v0 + at | find final velocity find original velocity find acceleration find time or change in time |

vavg = v0+v/2 | find average velocity find final velocity find original velocity |

x = x0 + v0t +1/2 at^2 | find position find original position find original velocity find time find acceleration |

v^2 = v0^2 + 2a(x − x0) | find final velocity find original velocity find acceleration find change in position, position, original position |

R = v0^2/2g sin^2 2θ | find R (radius of projectile motion) find original velocity find angle |

h =v0^2/2g sin^2 θ | find max height (of a projectile) find original velocity find angle |

Fnet = ma | find net force find mass find acceleration Newton's 2nd law |

FBA = −FAB | every action has an equal and opposite reaction, Newton's 3rd law |

W = mg | find weight find mass find gravity |

0 ≤ fs ≤ µsN | find force of static friction find coefficient of static friction find Normal force |

fk = µkN | find force of kinetic friction find coefficient of kinetic friction find Normal force |

F/A = Y ∆L/L | find force find area find pressure (force/area) find Young's modulus (tensile or elastic modulus) find change in length find original length |

Fk = −kx | find force find spring constant find compression of spring |

W = F d cos θ | find work find force find displacement find angle |

Wnet = −∆PE = ∆KE | find net work find change in potential energy find change in kinetic energy |

KE = 1/2 mv^2 | find kinetic energy find mass find volume |

PEk = 1/2 kx^2 | find potential energy of a spring find spring constant find displacement |

PEg = mgh | find potential energy of gravity find mass find height |

KEi + PEi + Wnc = KEf + PEf | conservation of energy find initial kinetic energy find initial potential energy find work due to nonconservative forces find final kinetic energy find final potential energy |

P = W/∆t | find power find work find elapsed time |

Eff = Wout/Ein | find efficiency find work output find energy input |

FG = G mM/r^2 | find gravitational force find gravitational constant find mass of object 1 (small) find mass of object 2 (large) find radius of rotation (distance between objects' centers) |

I = Favg ∆t | find moment of inertia find average force find change in time |

p = mv | find momentum find mass find velocity |

Fnet = ∆p/∆t | Linear momentum find net force find change in momentum find change in time |

v1 − v2 = v′2 − v′1 | conservation of velocity when masses are equal |

θ = s/r | find angle find arc length find radius |

v = rω | find velocity find radius find angular velocity |

f = 1/T | Hertz find frequency find period |

ω = 2πf = 2π/T | find angular velocity find frequency find period |

ac = v^2/r = rω2 | find centripedal acceleration find velocity find radius find angular velocity |

Fc = m v^2/r = mrω^2 | find centrifugal force find mass find velocity find radius find mass find angular velocity |

KEtrans = 1/2 mv^2 | find translational kinetic energy find mass find volume |

KErot = 1/2 Iω^2 | find rotational kinetic energy find moment of inertia find angular velocity |

Ipoint = MR^2 | find moment of inertia find mass find radius |

Idisk = 1/2 MR^2 | find moment of inertia find mass find radius |

Isphere = 2/5 MR^2 | find moment of inertia find mass find radius |

τ = rF sin θ = r⊥F | find torque find radius find angle find perpendicular force |

ω = ∆θ/∆t | find angular velocity find angle find time |

α = ∆ω/∆t | find angular acceleration find angular velocity find time |

τ = Iα | find torque find moment of inertia find angular acceleration |

L = Iω | find angular momentum find moment of inertia find angular acceleration |

τ = ∆L/∆t | find torque find change in angular momentum find change in time |

P = F/A | find pressure find force find area |

Pgauge = P − Patm | find gauge pressure find specific pressure find atmospheric pressure |

ρ = M/V | find density find mass find volume |

Q = ∆V/∆t = Av | find discharge find change in volume find change in time find cross sectional area find velocity |

Q = ∆Pπr4/8ηL | find discharge find change in pressure find radius of tube find viscosity find length of tube |

Power = P Q | find power find absolute pressure find discharge (flow rate) |

A · v = constant | find cross sectional Area find velocity |

P + ρgy + 1/2 ρv^2 = constant | Bernoulli's find absolute pressure find density find height find velocity |

FST = γL | find force of surface tension find surface tension find length over which the force acts |

P = 4γ/R | more surface tension find change in pressure (pin-pout) find surface tension find radius of curvature |

h = 2γ/ρgr | find height find surface tension find density find radius |

RE = ρvL/η = 2ρvr | find reynolds number find density find length find velocity find viscosity find radius |

xrms = √ 2Dt | diffusion find root mean square distance find Diffusion constant find time |

x(t) = A cos ωt and xmax = A | find displacement as a function of time find Amplitude find time find 2pi/period |

v(t) = −Aω sin ωt and vmax = Aω | find velocity as a function of time find amplitude find 2pi/period find time find maximum velocity |

a(t) = −Aω^2 cos ωt and amax = Aω2 | find acceleration as a function of time find Amplitude find 2pi/period find time |

E = 1/2 kx^2 + 1/2 mv^2 = 1/2 kx^2max = 1/2mv^2max | find energy find force constant find displacement from equilibrium |

v = √T/µ with µ =m/L | find velocity find period |

y(x, t) = A cos(ωt ± kx) with − for left moving wave | find find amplitude find 2pi/T * t find constant find displacement |

ω = 2π/T and k = 2π/λ | find period (T) find k (constant) find wavelength |

v = λf = ω/k | find velocity of sound find wavelength find wave frequency find 2pi/T find rigidity constant |

λn = 2L/n, fn = nv/2L with n = integer | string find wavelength find integer find length find frequency |

λn = 4L/n, fn = nv/4L with n = an odd integer | open-open pipe find wavelength find integer (count full nodes & antinodes) find length of pipe find speed of sound find frequency |

λn = 2L/n, fn = nv/2L with n = any integer | open-closed pipe find wavelength find integer (count nodes) find length of pipe find speed of sound find frequency |

fobs = fs v/v±vs with − for src moving towards obs | stationary observer find observed frequency find source frequency find speed of sound find speed of source |

fobs = fs v±vobs/v with + for obs moving towards src | moving observer find observed frequency find source frequency find speed of sound find speed of observer |

fbeat = |f1 − f2| | find beat frequency find frequency 1 find frequency 2 |

I = P/A = P/4πr2 | find intensity find power find area find radius |

β = 10 log I/I0 in dB with I0 = 10^−12 W/m2 | find sound intensity level in decibels find I0 (reference intensity, lowest threshold of hearing) find sound intensity |