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Bonus Equations t= v = vi + gt V f − Vi a or t = V f − Vi g where g is –9.8 m/s2 where g is –9.8 m/s2 or v = vi − gt where g is –9.8 m/s2 Centripetal force: Conservation of momentum: mv 2 Fc = r v1=m2v2/m1 PE=mgh where g= 9.8 m/s2 More Boyle’s Law: P1 = V 2 P2 V 1 heating and cooling when temperature is changing E = m × SH × ΔT Equations for Midterm Chapter 2: velocity: d v= t acceleration: v − vi a= f t Acceleration due to gravity (or g) is equal to –9.80 m/s2. specific heat of water = phase change solid to liquid Energy = m x Lf heat of fusion (Lf) for H2O is 333 kJ/kg at 0°C phase change liquid to gas Energy = m x Lf heat of vaporization for H2O is 2260 kJ/kg at 100°C d = vave • t d = vit + ½ a t2 vave = (vi + v f )/ 2 vf = vi+ a t vf2= vi2 + 2 a d Density Density = Force: F=ma Force due to gravity: Chapter 3 Work W = force × distance or W = F × d W = F par × d or Power work W or P = time t Energy 1 KE = mv 2 2 Momentum p= m v where p is momentum, m is mass in kg, and v is velocity in m/s Chapter 4 Temperature 9 5 F = C + 32 and C = ( F − 32) and 5 9 K= C+ 273 M Mass or D = Volume V Pressure F P= A Combined ideal gas law P1V 1 = P2 V 2 and PV=nRT T1 T2 W = mgh wher e m is mass in kg, g is 9.8 m/s 2 and h is the height of the object. power = 4.184 kJ kg °C remember T in Kelvin Chapter 5 Coulombs Law QQ QQ F = K 1 2 2 = 9x10 9 1 2 2 R R Ohm’s Law V or V = I ⋅ R I= R I is current in amps(A) V is voltage in volts (V) R is resistance in ohms (Ω) power P=I V P is in Watts (W) Transformers N 1 V1 I 2 = = N 2 V2 I1 Chapter 6 v= f λ The speed of sound is 3 x 108 m/s Where v is speed, f is frequency and lambda is wavelength. T=1/f where T is the period.