20:006 EXAM 2 FORMULAS
g = 10 m/s2
w=m×g
1 m = 100 cm,
1 kg = 1000 grams
atmospheric pressure ≈ 100,000 Pa
1 Pa = 1 N/m2
Rotational momentum (J) J = I Ω
I= rotational inertia
Ω=rotational velocity
Torque τ = F L
Pressure (P) =
Force = Pressure × Area
force (F) F
=
area (A) A
density (ρ) = mass / volume
Buoyant force = weight of displaced water
= volume of object submerged in liters × 10 N/liter
weight of 1 liter of water = 10 N
GPE = mgh
KE = ½ mv2
heat (Q) = mass (m) × specific heat (c) × temperature change (∆T) in C
Q = mc∆T
TC =
5
(TF − 32 )
9
9
TF = TC + 32
5
TK = TC + 273
Change in internal energy of a system
= heat absorbed by system − work done by system
Heat into Engine = Work done by engine + Heat discarded by engine
Qin = W + Qout
Engine efficiency =
frequency ( f ) =
work done by engine W
=
heat into the engine Qin
1
period (T )
period (T ) =
1
frequency ( f )
spring force (N) = spring constant k (N/m) × stretch or compression in
m Fspring
Mass-spring system
T = 2π
m
k
“golden rule”
= kx
Pendulum
v wave = λ f
T = 2π
L
g