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# HSFC Physics formula sheet

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### HSFC Physics formula sheet

1. 1. * O C E / 2 6 2 9 0 * Data, Formulae and Relationships Booklet (Revised Version 2.1) GCE Advanced Level and Advanced Subsidiary Physics A Physics units G481, G482, G484, G485 Instructions to Exams Officer/Invigilator • Do not send this Data Sheet for marking; it should be retained in the centre or destroyed. These data, formulae and relationships are for the use of candidates following the Physics A specification. Clean copies of this booklet must be available in the examination room, and must be given up to the invigilator at the end of the examination. Copies of this booklet may be used for teaching. © OCR 2010 GCE Physics A DC (SLM) 26290/8 CST255
2. 2. Data Values are given to three significant figures, except where more are useful. speed of light in a vacuum c 3.00 × 108 m s–1 permittivity of free space ε0 8.85 × 10–12 C2 N–1 m–2 (F m–1) elementary charge e 1.60 × 10–19 C Planck constant h 6.63 × 10–34 J s gravitational constant G 6.67 × 10–11 N m2 kg–2 Avogadro constant NA 6.02 × 1023 mol–1 molar gas constant R 8.31 J mol–1 K–1 Boltzmann constant k 1.38 × 10–23 J K–1 electron rest mass me 9.11 × 10–31 kg proton rest mass mp 1.673 × 10–27 kg neutron rest mass mn 1.675 × 10–27 kg alpha particle rest mass mα 6.646 × 10–27 kg acceleration of free fall g 9.81 m s–2 © OCR 2010 GCE Physics A CST255
3. 3. Conversion factors unified atomic mass unit 1 u = 1.661 × 10–27 kg electron-volt 1 eV = 1.60 × 10–19 J 1 day = 8.64 × 104 s 1 year ≈ 3.16 × 107 s 1 light year ≈ 9.5 × 1015 m Mathematical equations arc length = rθ circumference of circle = 2pr area of circle = pr 2 curved surface area of cylinder = 2prh volume of cylinder = pr 2h surface area of sphere = 4pr2 4 volume of sphere = pr 3 3 Pythagoras’ theorem: a2 = b2 + c2 For small angle θ ⇒ sinθ ≈ tanθ ≈ θ and cosθ ≈ 1 lg(AB) = lg(A) + lg(B) A lg( ) = lg(A) – lg(B) B ln(xn) = n ln(x) ln(ekx) = kx © OCR 2010 GCE Physics A CST255
4. 4. Formulae and relationships Unit 1 – Mechanics Unit 2 – Electrons, Waves and Photons Fx = F cosθ ΔQ = IΔt Fy = F sinθ I = Anev Δv Δt W = VQ a= V = IR v = u + at s= 1 (u + v)t 2 s = ut + R= 1 2 at 2 ρL A P = I 2R P = VI v2 = u2 + 2as e.m.f. = V + Ir W = mg V2 R W = VIt F = ma P= R Vout = R +2 R × Vin 1 2 moment = Fx v = fλ torque = Fd ax D ρ= m V λ= p= F A d sinθ = nλ E = hf W = Fx cosθ Ek = 1 mv2 2 λ= efficiency = useful energy output × 100% total energy input F = kx 1 Fx 2 stress = E= h mv R = R1 + R2 + … 1 1 1 = + +… R R1 R2 1 2 kx 2 F A strain = hc λ hf = φ + KEmax Ep = mgh E= E= x L Young modulus = stress strain © OCR 2010 GCE Physics A CST255
5. 5. Unit 4 – Newtonian World Unit 5 – Fields, Particles and Frontiers of Physics Δp Δt E= F Q v = 2pr T F= Qq 4pε0r 2 F= a= v2 r E= Q 4pε0r 2 F= mv2 r E= V d F= – G Mm r2 F = BIL sinθ g= F m F = BQv g= –GM r2 φ = BA cosθ 2 T 2 = 4p r 3 GM ( ) f= 1 T ω= 2p = 2pf T a = –(2pf)2 x x = A cos(2pft) induced e.m.f. = – rate of change of magnetic flux linkage Vs ns Vp = np Q = VC W= 1 QV 2 W= 1 CV 2 2 vmax = (2pf) A E = mcΔθ time constant = CR pV = NkT x = x0e pV = nRT C = C1 + C2 + … E= 3 kT 2 – t CR 1 1 1 = + +… C C1 C2 A = λN A = A0 e–λt N = N0 e–λt λt½ = 0.693 ΔE = Δmc2 I = I0 e–μx © OCR 2010 GCE Physics A CST255
6. 6. Z = ρc Ir (Z2 – Z1)2 = I0 (Z2 + Z1)2 Δλ v λ =c age of Universe = ρ0 = © OCR 2010 GCE Physics A 3H02 8p G 1 H0 CST255
7. 7. BLANK PAGE © OCR 2010 GCE Physics A CST255