Physics 9702/33 — October/November 2020

Using the calipers, determine the diameter of one of the masses.

diameter = ______ $\text{cm}$

Set up the apparatus as shown in Fig. 1.1, with the scale on the metre rule facing upwards.

● Adjust the apparatus until the pivot is $20.0\text{ cm}$ from end A of the rule and the string loop is $70.0\text{ cm}$ from end A of the rule.

The pivot and string loop should remain at these positions throughout the experiment.

● Place the three masses with the edge of the bottom mass approximately $37\text{ cm}$ from end A of the rule.

● Adjust the stand until the newton meter and string are perpendicular to the bench.

● Adjust the boss and the clamp until the rule is parallel to the bench.

● The distance from the pivot to the edge of the mass is $p$, as shown in Fig. 1.1.

Measure and record $p$.

$p$ = ______ $\text{cm}$

● Measure and record the newton meter reading $F$.

$F$ = ______ $\text{N}$

● Using your value of diameter from (a), calculate the radius $r$ of a mass.

$r$ = ______ $\text{cm}$

● Vary $p$ in the range $5.0\text{ cm} \leq p \leq 45.0\text{ cm}$ and determine six sets of readings of $p$ and $F$. For each value of $p$, adjust the boss and clamp until the rule is parallel to the bench.

Record your values in a table. Include values of $(p + r)$ in your table.

It is suggested that the quantities $F$ and $p$ are related by the equation

$$F = \frac{W}{Q} (p + r) + \frac{S}{Q}$$

where $W = 3.00\text{ N}$ and $Q$ and $S$ are constants.

Using your answers to (d)(iii), determine values for $Q$ and $S$. Give appropriate units.

$Q$ = ______

$S$ = ______