A student is determining the weight of a metre rule using a balancing method
Fig. 1.1 shows the apparatus
The student places the metre rule on the pivot. He places the load P on the metre rule at the
90.0 cm mark. Keeping load P at the 90.0 cm mark, he adjusts the position of the metre rule on the pivot so that the metre rule is as near as possible to being balanced
He records the distance a from the 90.0 cm mark to the pivot
He records the distance b from the pivot to the 50.0 cm mark
He repeats the steps, placing the load P at the 85.0 cm, the 80.0 cm, the 75.0 cm and the 70.0 cm marks.
The readings are shown in Table 1.1
Table 1.1
a / cm
|
b / cm
|
21.0
|
19.1
|
18.0
|
17.2
|
16.0
|
14.1
|
13.0
|
11.8
|
10.5
|
9.5
|