Answers: Level7

27.     (a)    

(b)     (i)      32                                            accept ‘80 ´ 0.4’                                      1

         Nm                                          accept ‘mN’                                              1

it is possible to award the mark for the unit if given in part (ii) or (iii) even if omitted here

(ii)     12                                            accept ‘15 ´ 0.8’                                      1

(iii)     20 clockwise                                                                                             1

consequential marking applies in
this part of the question

both the value and the direction are required for the mark

accept ‘32 – 12 clockwise’

accept answer (i) minus answer (ii) for the value

(c)     (i)      move ladder forwards or left                                                                     1

(ii)     move bucket forwards or left or further away                                            1

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28.     (a)     (i)      because the Earth was              accept ‘the Earth was moving’                 1
rotating or spinning

do not accept ‘the stars move’ or ‘the camera turned’

(ii)     any one from                                                                                            1

·   it is on or close to the earth’s axis

·   it is above the North Pole

accept ‘above the point of rotation’

accept ‘it is due North or North of the Earth’

do not accept ‘above the earth’

(b)     6                                                       accept ‘5’ or ‘7’                                       1

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29.     (a)     20                                                                                                                      1

(b)     200                                                    accept ‘20 ¸ 0.1’ or answer to (a) ¸ 0.1   1

         N/mm²                                              accept ‘Nmm–2’                                        1

accept ‘200 000 000 N/m²’ or ‘2 ´ 108 Pa’ for both marks

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30.     (a)     answers should be straight lines which meet mirror 2 with tolerances indicated by the hatching behind the mirror

(i)

                                                              1

both rays required for the mark

reflections at surfaces of the mirrors positioned within the range shown with reflected ray parallel to incident ray

disregard any arrows

(ii)

                                                               1

both rays required for the mark

reflections at surfaces of the mirrors positioned within the range shown with reflected ray parallel to incident ray

disregard any arrows

(b)     (i)      parallel to the incident ray          accept ‘back the same way’                     1
 or back towards the source      accept correctly drawn rays on the diagram

do not accept ‘reflected back or upwards or to the left’

(ii)     light is reflected back towards                                                                    1
car or driver or headlights

(iii)     light would probably not be        accept ‘light is reflected in a different     1
reflected back towards car        direction or away’
or driver                                  do not accept ‘it would dazzle the driver’

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31.     (a)     (i)      because the Earth turns             do not accept ‘because the Earth moves’ 1
or spins or rotates

(ii)     east to west                              both words are required for the mark      1

(b)     horizontal arrow pointing to the left                                                                      1

(c)     any one  from                                                                                                    1

·   it is behind the Sun                         accept ‘it is the other side of the Sun’

·   the Sun is in the way

·   it is below the horizon all night        accept ‘the night side of the Earth faces
                                                    the other way’ or ‘it is always on the
                                                    day side of the Earth’

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