Answers to the Student BookSupplement questions are indicated with an asteriskCambridge Assessment International Education bears no responsibility for the example answers to questions taken fromits past question papers which are contained in this publication.Exam-style questions and sample answers have beenwritten by the authors.In examinations,the way marks are awarded may be different.References to assessment and/orassessment preparation are the publisher's interpretation of the syllabus requirements and may not fully reflect theapproach of Cambridge Assessment International EducationSection 1 Motion,forces and energy1.1 Physical quantities and measurement techniquesTest yourself questions1a10b40c5d67e10002a3.00b5.50c8.70d0.43e0.13a1×105,3.5×103,428×108:5.04×102,2.7056×10b1000;2000000,69200;134;10000000004a1×103,7×105,1×10-7,5×105b5×10,8.4×102,3.6×10,1.04×1035 Thickness of 100 pages=100 x 0.10 mm =10 mmThickness of two covers =2 x 0.20 mm =0.40 mmTotal thickness of book 10 mm +0.4 mm 10.4 mm=10 mm (correct to 2 s.f.)6 a two b three c four d two7 Volume of rectangular block=length x breadth x height=4.1cm×2.8cm×2.1cm=24cm38 Stopwatch;at least 5Now put this into practice questions(Page 4)1 Area of triangle=x base x height=x 8 cm x 12 cm=48 cm22 Circumference 2=2t x 6 cm=38 cm(Page 5)1 Volume V=length×breadth×height=30cm×25cm×15cm=1l250cm3=11250×106m3=1.13×10-2m32 Volume of cylinder V=π2h=π×(5.0cm)2×25cm=2000cm3=2×103m3(Page 9)1a10b8.6c9.22a0.577b1.00c1.73Cambridge IGCSE Physics 4th editionHodder Stoughton Limited 2021