Physics · 5054 · Paper 4 variant 25054/42/O/N/23
Start0 of 40 marks·0 of 27 parts attempted — start anywhere
- 1(a)(i)Measure its body length l₀ to the nearest 0.1 cm, excluding the end loops.1 mark
- 1(a)(ii)Using your l₀ from (a)(i), calculate its extension e=l₁−l₀ in cm.1 mark
- 1(a)(iii)State the result in N/m.1 mark
- 1(a)(iv)Explain what a parallax error is when reading the extension and how to avoid it.2 marks
- 1(b)(i)The second reading t₂ is 13.8 s.1 mark
- 1(b)(ii)Using your t₁ and the given t₂=13.8 s, calculate the mean time t for 20 oscillations and complete Table 1.1.1 mark
- 1(b)(iii)Calculate the mean period T for one oscillation, then T², and complete Table 1.1 with units.1 mark
- 1(b)(iv)Calculate the second spring constant k₂ using k₂=11.8/T² and your value of T²; state N/m.1 mark
- 1(c)Explain why timing 20 oscillations twice gives a more accurate mean period than timing one oscillation twice.1 mark
- 2(a)(i)Record its reading to the nearest 0.5 °C in the missing Table 2.1 cell.1 mark
- 2(a)(ii)Explain why the student waits about 30 seconds before the initial hot-water temperature reading.1 mark
- 2(b)(i)Show the decrease/time, give two significant figures and unit.3 marks
- 2(b)(ii)Use the printed bottom-of-water temperatures 86.0 °C and 77.0 °C over 3 min in Table 2.1 to calculate average cooling rate P_B.1 mark
- 2(c)(i)Using your top and bottom cooling rates, suggest why a hot liquid should be stirred before its temperature is measured.1 mark
- 2(c)(ii)State one feature of the Fig. 2.1 or Fig. 2.3 apparatus arrangement that helps read the thermometer accurately.1 mark
- 2(d)Suggest one variable to keep constant.1 mark
- 2(e)After the thermometer is left in the hot water for 30 minutes, predict the water temperature in °C.1 mark
- 3(a)Record the initial terminal potential difference V₀ in V.1 mark
- 3(b)Record current I in A.1 mark
- 3(c)Complete Table 3.1 with units in all three headings and your current from (b) in the first row.1 mark
- 3(d)Draw a thin straight line of best fit.3 marks
- 3(e)(i)Use a large triangle on your Fig. 3.4 line to calculate its gradient m, showing your chosen values and working on the graph.2 marks
- 3(e)(ii)Extend your Fig. 3.4 best-fit line to the y-axis and record its intercept, the emf V₀ in V.1 mark
- 3(f)Calculate their percentage difference and state whether they agree within 10%.2 marks
- 3(g)Suggest a practical reason not to connect the flying lead less than 20.0 cm from end X of the wire in Fig. 3.1.1 mark
- 3(h)Show the variable-resistor symbol and correct connections, retaining the ammeter and supply voltmeter.2 marks