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ICSE Class X Notes 2019 : Physics (Vidyasagar Shishu Niketan (VSN), West Medinipur)

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Sital Mahapatra
Vidyasagar Shishu Niketan (VSN), West Medinipur
IX

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Formulae of Physics SN Formulae Remarks Force, Work, Power, Energy 1. 2. W=F S W=Fcos S 3. 1kJ=103 J 1MJ=106 J 1 J =107 erg 1 W h=3600 J 1 kW h=3.6 x 106 J 1 cal = 4.86 J 1 eV = 1.6x1019 J P = W/t 1 W = 1J/s =107 erg/s 1 kW = 103 W 1 MW = 106 W 1 GW = 109 W 1 KE= 2 m v2 PE = mgh L MA= E VR= VE / VL VR = dE / dL Wi = E x dE W o = L x dL =Po / Pi = Wo / Wi VR = MA x Load x Load Arm = Effort x Effort Arm Class II Lever = Force Multiplier Class III Lever = Speed Multiplier MA = VR = n (total number of pulley in Block & tackle system) MA = n w/E, =1-w/nE MA= 1/h = 1/sin Light c = v 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. V= v 1 2 = 2 / 1 =Vair or vacuum/Vmedium 1 2 = sin i / sin r In the direction of force In the direction of displacement SI to CGS Scalar quantity 27. 28. 29. 30 31. 32. 33. 34. 35. 2 = 1/2 1 r d =1/sin C r d = real depth/ apparent depth 1 = i+ e -A r1+r2 =A =[(sin(A+ m ))/2]/sin A/2 1 v 1 v , m= f u 1 P= f ( metre) 1 4 Amount of scattering ( ) - 1 u = Sound 36. 37. = 1 T 1 T 2l m = V= n V= 2d t 1 T 2 2l r = Electricity 38. 39. 40. 41. 42. 43 44. 45. 46. 47. 48. 49. 50. 51. 52. q = ne = it i=ne/t V= W q = iR=E-ir, i= 2 E R+ r V t R Rs =R1+ R2+ R3 1 1 1 1 + = + RP R1 R2 R3 W V2 P= = Vi = i2R = t R P t Total energy consumed = kWh 1000 Torque = niAB Es ns ip Transformation Ratio = = = Ep np is Heat Q = mc T C = mc Q C = T m1c1(T1-T) = m2c2(T-T2) Q=mL Radio Activity H=Vit =i2Rt= d= vxt 2 53. 54. E = mc2 2 13.64 Z E= -( ) eV 2 n

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