Answers to questions in the Student Book - Hodder Plus Home

More documents

Recommendations

Info

GCSE Physics for CCEA second edition24. a) volume of rivets = 70 – 50 = 20 cm 3b) volume of 1 rivet = 20/100 = 0.2 cm 3c) volume of air = 20 cm 3 , mass of air = 180 g, density = ?mass 180density = 9 g/cm 3volume 2025. a) clockwise moment = force x perpendicular distance to pivot= 150 x 0.9= 135 Nmb) clockwise moment = anticlockwise moment135 = F x 1.35135F = 100 N1.3526. clockwise moment = anticlockwise moment3 x X = 4 x 364 x 36X = = 48 cm327. a) moment exerted by boy = force x perpendicular distance to pivot= 100 N x 4 m= 400 Nmb) If in equilibrium: moment exerted by man = moment exerted by boy= 400 Nmc) moment exerted by man = force x distance to pivot400 = force x (4 – 3)= force x 1force = 400 N28. a) clockwise moment of 5 N force = 5N x 40 cm= 200 Ncmb) anticlockwise moment = clockwise momentweight x 25 cm = 200 Ncm200weight 25= 8N29. clockwise moment = anticlockwise momentF x 225 = 600 x 75600 x 75F 225= 200 N10
GCSE Physics for CCEA second edition30. clockwise moment = anticlockwise momentF x 0.6 = 100 x 0.3100 x 0.3=0.6= 50 N31. a) Where medians of triangle meet, middle of rectangle.b) In the centre of the cut-out circle, ie., not in the plastic sheet itself.32. a) It is a point through which the whole weight of the object appears to act.b) i) The centre of gravity of the pencil and the penknife is on a line below the point of thepencil.33. a)ii) The penknife and pencil would topple.b) Low centre of gravity and wide wheel base.34. a)b) The whiskey glass.c) Lower centre of gravity and wider base.35. a)i) unstable ii) neutral11
Page 1 and 2: GCSE Physics for CCEA second editio
Page 9: GCSE Physics for CCEA second editio
Page 49: GCSE Physics for CCEA second editio

Answers to questions in the Student Book - Hodder Plus Home

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?