q1 masses on pulley

1.(a)  (i)      1.     mass = 360 / 9.8 36.7 (kg)                                                               B1

        (allow 2sf)

(ii)     2.     density = mass / volume                                                                  C1

                   = 36.7 / 4.7 ´ 10–3

                   = 7.8 ´ 10–3                                                                         A1

          unit kg m–3                                                                                   B1

(ii)     right angled triangle with an additional correct angle marked                   M1

set of correct force labels and correct arrows                                            A1

algebra shown or scale given                                                                   C1

tension = 270 (N) or value in the range 255 to 285 (N)                             A1

  (b)   (i)      tension is a vector / has magnitude and direction                                      B1

direction involved in addition / the tensions or ropes act in
different directions                                                                                 B1

(ii)     sum =270 sin37 + 360 sin53                                                                   B1

       =162.5 + 287.5                                                                                B1

(or one mark each for values of 162.5 and 287.5 seen) = 450 (N)              A0