2 A fully charged capacitor discharges through a motor, which stretches a spring.
The capacitor has a capacitance of 9.40 µF, and discharges across a resistor with an initial potential
difference of 4.70 V.
C = 9.40 uF
M
k=8.49 x 10-3 N m-1
The spring constant of the spring is 8.49 x 10-3 Nm-¹.
2.1 Calculate the maximum possible extension of the spring.
2.2 The resistor is replaced with a resistor with greater resistance.
Explain how this affects the time taken for the spring to reach its maximum extension.
2.3 Explain why the spring is unlikely to reach this extension in practice.
m
3 marks
2 marks
2 marks