MJ20 P52 Q2 Viscosity of Liquid

 9702/52/M/J/20: A student investigates how the viscous force in a liquid varies with temperature.
The student releases a ball from the surface of the liquid in a container. The ball falls as shown in
Fig. 2.1. The student determines the speed of the ball between P and Q and measures the thermodynamic
temperature T of the liquid.

Viscosity is a term used to describe the viscous forces acting in a liquid. Viscosity has the unit
pascal second (Pas). The viscosity η of the liquid is calculated from the speed of the ball. The experiment is repeated for the same liquid at different temperatures. It is suggested that η and T are related by the equation 

\( \eta = He^{\frac{E}{kT}}\)

where E and H are constants and k is the Boltzmann constant.

May/June 2020 Paper 5 Variant 2 Questions 2 data analysis.

 

MJ20 P51 Q2 Discharging Capacitor

9702/51/M/J/20: A student investigates the discharge of a capacitor through a resistor using the circuit shown in Fig. 2.1. The student initially closes the switch and charges the capacitor. The switch is then opened and a stop-watch is started. The capacitor discharges through the resistor. At time t the potential
difference V across the capacitor is measured.

It is suggested that V and t are related by the equation where Q0 is the charge of the fully charged capacitor, C is the capacitance of the capacitor and R is the resistance of the resistor.

 May/June 2020 Paper 51 Question 2.

 

9702/12/M/J/20: Full video playlist here:

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  Also known as 9702s20qp12

MJ20 P11 Worked Solutions

9702/11/M/J/20: Full video playlist here:

https://www.youtube.com/playlist?list=PLXli3LrRvG-ZqeckKG8SuUzNszFbpQXD0

 

Also known as 9702s20qp11

FM20 P52 Q2 Capacitor Discharge

 9702/52/F/M/20: A student investigates the discharge of a capacitor through a resistor as shown in Fig. 2.1. The student initially closes the switch and charges the capacitor. The switch is then opened and a stop-watch is started. The capacitor discharges through the resistor. At different times t the current I is measured. It is suggested that I and t are related by the equation

\( I = \dfrac{E}{R} e^{-\frac{t}{RC}}\)

where E is the e.m.f. of the power supply, C is the capacitance of the capacitor and R is the resistance of the resistor.

Solutions for February/March 2020 Paper 5 variant 2 question 2 data analysis and graphing.

ON19 P52 Q2 Resistance of LDR

9702/52/O/N/19: A student is investigating how the resistance of a thermistor varies with temperature. The thermistor is placed in water, as shown in Fig. 2.1. 

 The thermistor is connected to a battery with electromotive force (e.m.f.) E and negligible internal resistance. The current I in the thermistor is measured. The resistance R of the thermistor is then determined using the expression R = E/I.

The experiment is repeated for different temperatures of the water.It is suggested that the resistance R of the thermistor and the thermodynamic temperature T are related by the equation R = pT^q where p and q are constants 

 

 

 

 

 

ON19 P51 Q2 Period of Spring

 9702/51/O/N/19: A student is investigating the oscillations of a mass attached to two springs connected in series, as shown in Fig. 2.1.

 

 October/November 2019 Physics Paper 5 Variant 1 Questions 2 of A Level Practical.

 

 

 

 

MJ19 P51 Q2 Variable Resistor

 9702/51/M/J/19: A student is investigating a rotary variable resistor, as shown in Fig. 2.1. The  variable  resistor  is  connected  to  a  battery  of  electromotive force (e.m.f.) E and negligible internal resistance, as shown in Fig. 2.2.

The student uses a protractor to measure the angle θ through which the spindle of the variable resistor is rotated and records the current I. The experiment is repeated for different angles. It is suggested that I and θ are related by the equation E = IKθ where K is a constant.

Solutions for practical Paper 5 variant 1 Question 2 May/June 2019 Cambridge A Level Physics.

ON18 P51 Q2 Charge on Sphere

 9702/51/O/N/18: A  student  is  investigating  the  electric  potential  near  a  charged  metal  sphere.  The  sphere  is  suspended from the ceiling as shown in Fig. 2.1. 

A flame probe is used to measure the potential V at a distance L from the surface of the sphere. The experiment is repeated for different distances from the sphere. It is suggested that V and L are related by the equation 

\(V = \dfrac{Q}{4 \pi \epsilon_0 0(L + a)}\) 

where Q is the charge on the sphere, a is the radius of the sphere and ε0 is the permittivity of free space.

Solutions for October/November 2018 Paper 5 variant 1 question 2 data analysis.

FM18 P52 Q2 Double Slit Interference

 9702/52/F/M/18: A  student  is  investigating  monochromatic  light  passing  through  a  double  slit.  Bright  and  dark  fringes are produced on a screen as shown in Fig. 2.1. 

The distance w between 10 bright fringes is measured. The fringe spacing P between neighbouring bright fringes is then determined.

The experiment is repeated for light of different wavelengths \(\lambda \).

It is suggested that the fringe spacing P and the wavelength \(\lambda \). are related by the equation

\(\dfrac{P}{D} = \frac{\lambda}{s} \)

where D is the distance from the double slit to the screen and s is the slit separation.

Paper 5 variant 2 Question 2 February/March data analysis with gradient, y-intercept, and uncertainty.

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.