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A spring is fitted with a scale pan as shown in Figure
3.5 and the pointer points to the 30 cm mark on the
scale. When some sand is placed in the pan the
pointer points to the 45 cm mark. When a 20 g mass
is placed on top of the sand the pointer points to the
55 cm mark.
00000000
scale
Figure 3.5
a What extension is produced by the sand?
b What extension is produced by the 20 g mass?
c What is the mass of the sand?

A spring is fitted with a scale pan as shown in Figure35 and the pointer points to the 30 cm mark on thescale When some sand is placed in the pan thepointer poi class=


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