# CHAPTER 8 UNITS, PREFIXES AND ENGINEERING NOTATION

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1 CHAPTER 8 UNITS, PREFIXES AND ENGINEERING NOTATION EXERCISE 34 Page State the SI unit of volume. The SI unit of volume is cubic metres, m 3 2. State the SI unit of capacitance. The SI unit of capacitance is the farad, F 3. State the SI unit of area. The SI unit of area is square metres, m 2 4. State the SI unit of velocity. The SI unit of velocity is metres per second, m/s 5. State the SI unit of density. The SI unit of density is kilograms per cubic metres, kg/ m 3 6. State the SI unit of energy. The SI unit of energy is the joule, J 7. State the SI unit of charge. The SI unit of charge is the coulomb, C 8. State the SI unit of power. 112

2 The SI unit of power is the watt, W 9. State the SI unit of angle. The SI unit of angle is the radian, rad, or degrees,. State the SI unit of electric potential. The SI unit of electric potential is the volt, V 11. State which quantity has the unit kg. Mass has units of kg 12. State which quantity has the unit symbol Ω. Electrical resistance has the unit symbol, Ω 13. State which quantity has the unit Hz. Frequency has the unit hertz, Hz 14. State which quantity has the unit m/s 2. Acceleration has the unit of m/s State which quantity has the unit symbol A. Electric current has the unit symbol, A (i.e. amperes) 16. State which quantity has the unit symbol H. Inductance has the unit symbol, H (i.e. henry) 113

3 17. State which quantity has the unit symbol m. Length has the unit symbol, m (i.e. metres) 18. State which quantity has the unit symbol K. Thermodynamic temperature has the unit symbol, K (i.e. Kelvin) 19. State which quantity has the unit Pa. Pressure has the unit symbol, Pa (i.e. Pascal) 20. State which quantity has the unit rad/s. Angular velocity has the unit symbol, rad/s (i.e. radians per second) 21. What does the prefix G mean? Giga has the symbol G, which means What is the symbol and meaning of the prefix milli? Milli has the symbol m and means What does the prefix p mean? Pico has the symbol p and means What is the symbol and meaning of the prefix mega? Mega has the symbol M and means 6 114

4 EXERCISE 35 Page Express in standard form: (a) 73.9 (b) 28.4 (c) (a) 73.9 = = 7.39 (b) 28.4 = = 2.84 (c) = Express in standard form: (a) 2748 (b) (c) (a) 2748 = (b) = (c) = Express in standard form: (a) (b) (c) (a) = (b) = (c) = Express in standard form: (a) (b).04 (c) 0.09 (a) = (b).04 = (c) 0.09 = Express in standard form: (a) 1 2 (b) (c) (d) 1 32 (a) 1 2 = 0.5 =

5 (b) = = (c) = = (d) 1 32 = = Express the numbers given as integers or decimal fractions: (a) (b) (c) (d) 7 0 (a) = (b) = (c) = 54 0 (d) 7 0 = 7 1 = 7 7. Express the numbers given as integers or decimal fractions: (a) (b) (c) 8 3 (a) = (b) = (c) 8 3 = Evaluate, stating the answers in standard form: (a) (4.5 2 )(3 3 ) (b) 2 (5.5 4 ) (a) ( )( 3 ) = = = 135 = (b) 2 ( ) = 11 4 = 1000 =

6 9. Evaluate, stating the answers in standard form: (a) (b) (2.4 3)(3 2) (4.8 4) (a) = 2 3 ( 5) = = = (b) ( 3 )( 2 ) 4 ( ) = Write the following statements in standard form. (a) The density of aluminium is 27 kg m 3 (b) Poisson's ratio for gold is 0.44 (c) The impedance of free space is Ω (d) The electron rest energy is MeV (e) Proton charge mass ratio is C kg 1 (f) The normal volume of a perfect gas is m 3 mol 1 (a) The density of aluminium is 27 kg m 3 = kg m 3 in standard form (b) Poisson's ratio for gold is 0.44 = in standard form (c) The impedance of free space is Ω = Ω in standard form (d) The electron rest energy is MeV = MeV in standard form (e) Proton charge mass ratio is C kg 1 = C kg 1 in standard form (f) The normal volume of a perfect gas is m 3 mol 1 = m 3 mol 1 in standard form 117

7 EXERCISE 36 Page Express Pa in engineering notation in prefix form Pa = 60 3 Pa = 60 kpa 2. Express W in engineering notation in prefix form W = W = 150 μw or 0.15 mw 3. Express 5 7 V in engineering notation in prefix form 5 7 V = 50 6 V = 50 MV 4. Express F in engineering notation in prefix form F = 55 9 F = 55 nf 5. Express W in engineering notation in prefix form W = 0 3 W = 0 kw 6. Express A in engineering notation in prefix form A = A = 0.54 ma or A = 540 µa 7. Express 15 5 Ω in engineering notation in prefix form 15 5 Ω = Ω = Ω = 1.5 MΩ 8. Express V in engineering notation in prefix form V = V = V = 22.5 mv 118

8 9. Express Hz in engineering notation in prefix form Hz = 35 9 Hz = 35 GHz. Express F in engineering notation in prefix form F = F = 15 pf 11. Express A in engineering notation in prefix form A = 17 6 A = 17 µa 12. Express Ω in engineering notation in prefix form Ω = Ω = 46.2 kω 13. Rewrite ma in µa ma = A = A = 3 6 = 3 µa 14. Rewrite 2025 khz as MHz khz = Hz = Hz = MHz 15. Rewrite 5 4 N in kn. 5 4 N = N = 50 3 N = 50 kn 16. Rewrite 300 pf in nf. 300 pf = F = F = F = 0.3 nf 119

9 17. Rewrite 6250 cm in metres cm = 6250cm 0cm/m = m 18. Rewrite 34.6 g in kg g = 34.6g 00g/kg = kg 19. Evaluate: in engineering notation = = Evaluate ( )( 25 3 ) 6 ( 0 ) in engineering notation. 5 3 ( )( ) 6 ( ) = = = = ( 6) = The distance from Earth to the moon is around m. State the distance in kilometres. Distance = m = = 8 = 3.8 5km 22. The radius of a hydrogen atom is 0.53 m. State the radius in nanometres m Radius = 0.53 m = m = 9nm/m = nm 23. The tensile stress acting on a rod is Pa. Write this value in engineering notation. Tensile stress = Pa = = 5.6 MPa 120

10 24. The expansion of a rod is m. Write this in engineering notation. Expansion = m = m = 4.3 mm 121

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