exam1 - Physics 2020 Exam 1 Constants and Formulae Useful...

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Physics 2020 Exam 1 Constants and Formulae Useful Constants k e =8 . 99 × 10 9 Nm 2 /C 2 ± . 85 × 10 - 12 C 2 /(N m 2 ) G =6 . 673 × 10 - 11 2 /kg 2 e =1 . 602 × 10 - 19 C m p . 672 × 10 - 27 kg m e =9 . 110 × 10 - 31 kg c =3 . 00 × 10 8 m/s g . 80 m/s 2 1eV = 1 . 602 × 10 - 19 J1 a m u = 1 . 661 × 10 - 27 kg 1 μ = 1 micro = 10 - 6 1 pico = 10 - 12 1 km = 10 3 m 1 mi = 5280 ft 1 mm = 10 - 3 m 1 cm = 10 - 2 m 1 min = 60 s 1 hr = 3600 s 1day = 8 . 64 × 10 4 s 1 yr = 365.242 days
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Useful Formulae A (circle) = πr 2 = πD 2 / 4 A (sphere) = 4 2 sin θ = (opposite)/(hypotenuse) r 2 = x 2 + y 2 cos θ = (adjacent)/(hypotenuse) 1 = cos 2 θ + sin 2 θ tan θ = sin θ/ cos θ = (opposite)/(adjacent) ± F g =( Gm 1 m 2 /r 2 r ± F = m±a ± F g = ±w = m±g F e = k e | q 1 || q 2 | /r 2 ± E = ± F e /q Φ E = EA cos θ = Q inside E = k e q/r 2 P = W/ Δ t = I Δ V = I 2 R =(Δ V ) 2 /R V = k e W = ΔPE = ± q Δ V = ± qEd V = V i = k e ( q i /r i ) R = ρL/A R V/I R = R [1 + α ( T - T )] ρ = ρ [1 + α ( T - T )] C = Q/ Δ VI Q/ Δ t C = ² A/d C = κC U = Q 2 / (2 C )= 1 2 C V ) 2 = 1 2 Q V )
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Physics 2020-002 Name: Exam 1A – 8 February 2010 . Part A: Hard Multiple Choice (10 points total, 2 points each, Circle Best Answer). 1. A plate in a parallel-plate capacitor has a surface area of 2 . 45 × 10 - 4 m 2 and a plate separation of 1.88 mm. This capacitor has a dielectric and a capacitance of 5.40 pF. What is the dielectric constant of this dielectric? a) 1 . 15 × 10 - 12 b) 1 . 15 × 10 - 3 pF c) 5.40 d) 4.69 e) 120 pF 2. An alpha particle ion with a charge of +2 e experiences a force of 2 . 67 × 10 - 12 N as it moves through an electric ±eld. What is the strength of the electric ±eld?
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exam1 - Physics 2020 Exam 1 Constants and Formulae Useful...

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