ON17 P52 Q2 Standing Waves

 9702/52/O/N/17: A student is investigating stationary waves on a stretched elastic cord. A vibrator attached to the cord is connected to a signal generator. The apparatus is set up as shown in Fig. 2.1.

The  mass  M  attached  to  the  cord  is  adjusted  until  resonance  is  obtained.  The  number  n  of  antinodes on the stationary wave is recorded. The experiment is repeated with different masses to obtain different values of n. It is suggested that M and n are related by the equation

\(f = \dfrac{n}{2L} \sqrt{\dfrac{Mg}{\mu}} \)

where f  is  the  frequency  of  the  vibrator,  g  is  the  acceleration  of  free  fall,  L  is  the  length  of  the  elastic cord and n is the mass per unit length of the elastic cord.

 

October/November 2017 Paper 5 Variant 2 Question 2 data analysis.

ON17 P51 Q2 Force on Bridge

9702/51/O/N/17:  A student is investigating how the forces acting on a bridge vary as the position of a load on the bridge is changed. The bridge is modeled as shown in Fig. 2.1 with two newton-meters providing the support forces. 

 A load of mass m is placed at a distance x from support A. The readings of the newton-meters T1 and T2 are recorded for different values of x.

It is suggested that T1, T2 and x are related by the equation 

\( T_1 - T_2 = \dfrac{mg(s - x) - mgx}{s} \)

where s is the separation of the newton-meters and g is the acceleration of free fall.

Oct/Nov 2017 Paper 5 Variant 1 Questions 2 data analysis.

MJ17 P51 Q2 Oscilloscope Pulse

9702/51/M/J/17: A student is investigating how the time for an electrical pulse to travel in a coaxial cable varies with the length of the cable. The pulse is reflected at one end of the cable. An oscilloscope is used to display the initial pulse and the reflected pulse. The trace on the oscilloscope is shown in Fig. 2.1.

The time t for the pulse to travel to the end of the cable and back is determined by measuring the distance d between the pulses on the screen, and then using the time-base and the relationship t = d × time-base. The initial length of the cable is L. A total length Z is removed from the cable and the experiment is repeated. It is suggested that t and Z are related by the equation v = 2 (L – Z)/t where v is the speed of the pulse.

Solutions for practical Paper 5 variant12 Question 2 May/June 2017 Cambridge A Level Physics.

ON16 P52 Q2 LED Voltage

 9702/52/O/N/16: A  student  is  investigating  the  characteristics  of  different  light-emitting  diodes  (LEDs).  Each  LED  needs a minimum potential difference across it to emit light.The circuit is set up as shown in Fig. 2.1. 

The potentiometer is adjusted until the LED just emits light. The potential difference V across the LED is measured.The experiment is repeated for LEDs that emit light of different wavelength λ. It is suggested that V and λare related by the equation V = pλ^q where p and q are constants.

Solutions for October/November 2016 Paper 5 variant 2 question 2 data analysis.

ON11 P52 Q2 Orbit Period

 9702/52/O/N/11: A scientist is observing some of the moons orbiting the planet Jupiter. For six different moons, the scientist records the distance r  from the centre of Jupiter and the period T  of the orbit. It is suggested that T and r are related by the equation \(T^2 = kr^3\) where k is a constant.

Solutions for practical Paper 5 variant 2 Question 2 Oct/Nov 2011 Cambridge A Level Physics.

ON10 P53 Q2 Capacitor Discharge

 9702/53/O/N/10: A student is investigating how the discharge of a capacitor through a resistor depends on the resistance of the resistor. The equipment is set up as shown in Fig. 2.1.

The  student  charges  the  capacitor  of  capacitance C  and  then  discharges  it  through  a  resistor of resistance R. After 15.0 s the student records the potential difference V across the capacitor. The student repeats this procedure for different values of R. 

It is suggested that V and R are related by the equation \(V = V_0 e^{–\frac{t}{CR}}\) where \(V_0\) is the initial potential difference across the capacitor and t is the time over which the capacitor has discharged.

Solutions for practical Paper 5 variant 3 Question 2 Oct/Nov 2010 Cambridge A Level Physics.