Learn Extracted exam questions A-Level Physics 9702 Physics November 2025 Question Paper 52
9702 Physics November 2025 Question Paper 52
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Fig. 1.1 shows a model wind turbine with blades, each of length $L$, placed in moving air.
The area of the circle swept by the blades of the turbine is $A$.
The output of the turbine has two terminals. The turbine is connected to a resistor of resistance $R$. At a speed $v$ of the moving air, the current in the resistor is $I$.
The atmospheric pressure is $P$ and the thermodynamic temperature of the air is $T$.
It is suggested that $I$ is related to $v$ by the relationship
where $Q$ is a constant.
Plan a laboratory experiment to test the relationship between $I$ and $v$.
Draw a diagram showing the arrangement of your equipment.
Explain how the results could be used to determine a value for $Q$.
In your plan you should include:
\begin{itemize} \item the procedure to be followed \item the measurements to be taken \item the control of variables \item the analysis of the data \item any safety precautions to be taken. \end{itemize}
A student observes the orbits of some of the moons around the planet Saturn, as shown in Fig. 2.1.
For the moon Pandora, the period of the orbit and the mean distance from the centre of Saturn are determined.
The measurements of period $T$ and mean distance $r$ are repeated for other moons.
It is suggested that $T$ and $r$ are related by the equation
where $n$ and $k$ are constants.
A graph is plotted of $\lg T$ on the $y$-axis against $\lg r$ on the $x$-axis.
Determine expressions for the gradient and $y$-intercept.
gradient = \hrulefill
$y$-intercept = \hrulefill
Values of $r$ and $T$ are given for different moons in Table 2.1.
\begin{center} \textbf{Table 2.1}
\begin{tabular}{|c|c|c|c|c|} \hline moon & $r / 10^8\text{ m}$ & $T / 10^3\text{ s}$ & $\lg(r / 10^8\text{ m})$ & $\lg(T / 10^3\text{ s})$ \ \hline Pandora & 1.42 & $52 \pm 5$ & & \ \hline Mimas & 1.86 & $81 \pm 5$ & & \ \hline Enceladus & 2.38 & $120 \pm 10$ & & \ \hline Tethys & 2.95 & $170 \pm 10$ & & \ \hline Dione & 3.77 & $240 \pm 20$ & & \ \hline Rhea & 5.28 & $390 \pm 30$ & & \ \hline \end{tabular} \end{center}
Calculate and record values of $\lg(r / 10^8\text{ m})$ and $\lg(T / 10^3\text{ s})$ in Table 2.1. Include the absolute uncertainties in $\lg(T / 10^3\text{ s})$.
Plot a graph of $\lg(T / 10^3\text{ s})$ against $\lg(r / 10^8\text{ m})$. Include error bars for $\lg(T / 10^3\text{ s})$.
Draw the straight line of best fit and a worst acceptable straight line on your graph. Label both lines.
Determine the gradient of the line of best fit. Include the absolute uncertainty in your answer.
gradient = \hrulefill
Determine the $y$-intercept of the line of best fit. Include the absolute uncertainty in your answer.
$y\text{-intercept} = \hrulefill$
Using your answers to (a), (c)(iii) and (c)(iv), determine the values of $n$ and $k$. Include the absolute uncertainties in $n$ and $k$. You need not be concerned with units.
$n = \hrulefill$ $k = \hrulefill$
Titan is another moon of Saturn. The orbit of Titan has a period of $1.38 \times 10^6\text{ s}$.
Determine the value of $r$ for Titan.
$r = \hrulefill\text{ m}$