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Full Answers to Review Questions - Hodder Plus Home

Full Answers to Review Questions - Hodder Plus Home

Full Answers to Review Questions - Hodder Plus

Full Answers to Review Questions 1 Quantities and units 1 a) Metre and second are base units, and speed is a derived quantity; the only base quantity is therefore length – the answer is A. b) Force is a derived quantity; metre and second are both base units; the newton, N, is the only derived unit – the answer is C. c) Acceleration and force both have implied direction and so are vector quantities; metre is a unit; speed has magnitude only, and so is a scalar quantity – the answer is D. d) Distance, mass and time have magnitude but not direction and are all scalar quantities; velocity is the only vector quantity – the answer is D. 2 F = PA = 10 × 10 6 Pa × 220 × 10 −6 m 2 = 2.2 × 10 3 N = 2.2 kN 3 From Table 1.2 (page 3): • The units of Q are: A s • Those of V are: kg m2 A−1 s−3 Therefore the units of C are: ___________ A s kg m2 A−1 s−3 = kg−1 m−2 A2 s4 4 a) 11 km; S 278 E b) Average speed = 3.0 km h −1 Average velocity = 2.2kmh −1 in the direction S 278E 5 Horizontal component = 120 cos 30 = 104 m s −1 Vertical component = 120 sin 30 = 60 m s −1 2 A guide to practical work 1 a) For example: l/mm w/mm t/mm 95 62 43 96 62 43 Average 95(.5) 62 43 Volume: V = l w t = 9.55 cm × 6.2 cm × 4.3 cm = 255 cm 3 Density = m __ = _______ 250 g V 255 cm3 = 0.98 g cm −3 (980 kg m −3 ) b) Percentage uncertainty in l = 1 mm ________ × 100% = 1.0% 95.5 mm Percentage uncertainty in w = 1 mm ______ × 100% = 1.6% 62 mm Percentage uncertainty in t = 1 mm ______ × 100% = 2.3% 43 mm Table A.1 � Edexcel Physics for AS © Hodder Education 2009 1

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