(a)[2]
Fig. 1.1 shows a book labelled "PHYSICS" resting on a ruler marked from 0 to 30 centimetres, and the student records the length. length of book = 19.9 cm. This measurement is not accurate. Describe two ways that the student can improve the accuracy of his measurement.
(b)[3]
The student wants to work out the average (mean) thickness of one sheet of paper in the book. Describe how he can measure such a tiny distance using only a ruler.
(c)[4]
Calculate the weight of the book. Give the unit as well.