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### 50 Cards in this Set

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 Mean u=Exi/N Standard Deviation St Dev= Sq. root( E(xi-u)^2/(N-1) ) displacement disp=(fin. pos.)-(init. pos.) path length s=total distance covered speed at time t when acceleration is constant v(t)=at+Vo position at time t when acceleration is constant S(t)=.5at^2+(Vo)t+So average acceleration a=(change in V)/(change in t) Newton's 2nd Law Fnetext=m*a where Fnetext is the sum of all forces acting on the object Newton's 1st Law a=0 if Fnetext=0 Newton's 3rd Law (Force on 1 by 2)= (-Force on 2 by 1) Weight W=Fg=mg m=mass of object g=accel due to gravity (9.8m/s^2) Force of friction f=uN Work W=Fd Kinetic Energy KE=.5(m)(v^2) Potential Energy PE=mgh Conservation of Mechanical Energy (Change in KE)=(-Change n PE) Ideal Mechanical Advantage IMA=Se/Sr Actual Mechanical Advantage AMA=Fr/Fe Torque torque=Force*distance Temperature Conversions Tf=(9/5)Tc+32 Tc=(5/9)(Tf-32) Tk=(Tc+273) First Law of Thermodynamics -energy is conserved (Change in U)=Q+W U=internal energy of a thing Q=heat added to the thing W=work done on the thing First Law of Thermodynamics (continued) Q=sm(change in T) Q-heat added to the thing s=specific heat of the thing m=mass of the thing (Change in T)=change in temp of the thing Energy Conversion 4.186 J/cal Heat transfer by conduction Q/t=(AK(T2-T1))/d Heat transfer by radiation Q/t=eoA(T2^4 - T1^4) Pressure (of fluids) P=F/A Absolute (hydrostatic) Press. Pabs=Po+dgh usually Po=1atm d=density of liquid h=depth in liquid Gauge (hydrostatic) Pressure P=dgh Poiseuille's Law FR=(P1-P2)(pie*r^4/8xL) FR=flow rate x=viscosity -P1 and P2 are pressures at the end of a tube with length L and radius R Resistance to fluid flow R=8xL/(pie*r^4) x stills =viscosity Continuity Equation -flow rate remains constant for an incompressible fluid A1V1=A2V2 A=area V=flow speed Ideal Gas Law PV=nRT P=pressure V=volume n=# of moles T=temp R=8.32 J/mol-deg Boyle's Law special case of ideal gas law -n and t are fixed P(initial)V(initial)= P(final)V(final) Critical Velocity for onset of turbulence in a tube Vc=Rx/dr x=viscosity d=fluids density r=tubes radius R=reynold's # (about 1000) Laplace's Law of wall tension -(for cylindrical membranes) T=Pr Laplace's Law of wall tension -(for spherical membranes) T=(Pr)/2 Bernoulli's Equation -energy per volume of ideal fluid remains constant E/V=.5d(v^2)+dgh+P=constant .5d(v1^2)+dg(h1)+P1= .5d(v2^2)+dg(h2)+P2 Coloumb's Law F=(K(q1)(q2))/r^2 F=force b/w charges q1 & q2 separated by distance r K=9*10^9 Nm^2/C^2 Current I=(change in Q)/(change in t) charge per time Relation b/w voltage and electric potential energy PE=qV Faraday's Law V=-N(change n z)/(change n t) N=# of windings in wire loop z=magnetic flux Magnetic Flux through a wire loop z=BA Ohm's Law I=V/R V=RI I=current in amps V=voltage in volts R=resistance measured in ohms Power dissipated by resistor P=IV P=(V^2)/R Equivalent Resistance for series circuit Req=R1+R2+R3.... Equivalent Resistance for parallel circuit 1/Req=1/R1+1/R2+1/R3.... Frequency of Household AC current 60 Hz Current at threshold of feeling 1 mA Maximum current harmless to humans 5 mA Minimum current that can be fatal to a human 100-300 mA