SUMMARY Important formulae
g = 9,8 m/s2 ................................... (1.1) W = mg newtons (N) .................. (1.2) speed =s v = s v = s g = 3
v t m/s2 ................................... (1.6)
F = mg newtons ............................ (2.1) MA = load VR = s
s
E L
Q = mc3t joules ........................... (4.3) heat lost = heat gained ............ (4.4)
t m/s ............................... (1.3) t m/s ....................................... (1.4) t m/s ....................................... (1.5) 3
(hot body) = cooler body mc3t = mc3t .................... (4.5)
(hot body) (cooler body) 3ℓ = αℓo3t .................................... (4.6) ℓf = ℓo ± 3ℓ .................................... (4.7)
I = V
effort ................................... (2.2) ......................................... (2.3)
VR = No of pulleys ....................... (2.4) VR = D
d .......................................... (2.5)
Moment = F × s Nm .................... (2.6) T = F × r Nm ................................ (2.7)
W = F × s joules .......................... (3.1) P = W
P = Fs t
t watts .................................. (3.2) × watts ............................... (3.3)
P = F × v watts .............................. (3.4)
t = T – 273 °C ............................... (4.1) T = t + 273 K ................................ (4.2)
R amps .................................... (6.1)
Q = I2Rt joules .............................. (6.2) P = VI watts .................................. (6.3) P = I2R watts ................................. (6.4) Series circuits: VT = V1 + V2 + V3 ....................... (6.5) IT = I1 = I2 = I3 .............................. (6.6) RT = R1 + R2 + R3 ......................... (6.7) Parallel circuits: IT = I1 + I2 + I3 .............................. (6.8)
VT = V1 = V2 = V3 ....................... (6.9) 1
RT = 1 R = ρ
R1 + 1 R3 R2 + 1 ............... (6.10)
Rt = Ro(1 + αot) Ω ...................... (6.12) ℓ
A ohms ............................... (6.11)
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