Download Bonus Equations a V V t f − = or where g is –9.8 m/s2 gt vvi +

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.