Physics > GCSE MARK SCHEME > Homework: Units and basic math skills. Questions and answers. Graded A+ (All)

Homework: Units and basic math skills. Questions and answers. Graded A+

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State the standard units that are used for the following physical quantities: Some units are stated with prefixes that mean a specific multiple. You need to be able to convert such units back to sta ... ndard units. The table gives the names, symbols and multiples of the prefixes: 2. Convert the following quantities into appropriate standard units: a) 900 g = 0.9 kg b) 150 g = 0.15 kg c) 75,000 mg = 0.075 kg d) 90 km = 90,000 m e) 377 mm = 0.377 m f) 7 minutes = 420 s g) 3 hours = 10,800 s h) 50 ns = 0.00000005 s i) 78 mm/s = 0.078 m/s j) 5 km/s = 5,000 m/s k) 759 MJ = 759,000,000 J l) 89 GJ = 89,000,000,000 J m) 0.5 TW = 500,000,000,000 W n) 37 mA = 0.037 A o) 900 µC = 0.0009 C p) 100 kV = 100,000 V q) 78 MΩ = 78,000,000 Ω r) 500 mm2 = 0.0005 m2 s) 47 cm3 = 0.000047 m3 t) 3.7 g/cm3 = 3,700 kg/m3 Name Nano- Micro- Milli- Centi- Kilo- Mega- Giga- TeraSymbol n µ m c k M G T Multiplier 10-9 10-6 10-3 10-2 103 106 109 1012 a) Mass kilograms, kg b) Distance / height metres, m c) Time seconds, s d) Speed e) Temperature degrees Celsius, ºC f) Energy joules, J g) Power watts, W h) Electric current amps, A i) Charge flow coulombs, C j) Potential difference volts, V k) Resistance ohms, Ω l) Area metres squared, m2 m) Volume metres cubed, m3 n) Density [Show More]

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