OCR AS LEVEL 2022 PHYSICS A QUESTION PAPER -H156-02 PAPER 2-H156/02 Depth in physics

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Answer all the questions. 1 A student investigates the motion of a steel ball in oil in a laboratory. The radius r of the ball is 8.1mm. (a) Describe how the student can determine r accurately in t... he laboratory. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [3] (b) The student uses a measuring cylinder and a digital balance to determine the density of the oil. The student records the following measurements: • mass of empty measuring cylinder = 96g • volume of oil added to measuring cylinder = 87cm3 • total mass of measuring cylinder and oil = 169g Show that the density of the oil is about 840kgm–3. [2] (c) The steel ball is submerged in the oil. Show that the upthrust acting on the steel ball is 1.8 × 10–2N. [2] 4 © OCR 2022 (d) The student fills a long tube with the oil. The student drops the steel ball from rest at the surface of the oil at time t = 0. The displacement s of the ball is measured from the surface of the oil. The graph shows the displacement s against time t for the steel ball from the instant it enters the oil. 0 0.2 0.4 0.6 0.8 1.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 s /m t/ s (i) The terminal velocity v of the steel ball is 1.8ms–1. Describe and explain how this can be determined from the graph. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3] 5 © OCR 2022 Turn over (ii) Use the graph to calculate the velocity u of the steel ball at time t = 0.20s. u = ................................................ ms–1 [2] (e) The mass of the steel ball is 17g. The drag F acting on the steel ball falling through the oil is given by the equation F = 6πηrv where η is a constant for the oil, r is the radius of the steel ball and v is the speed of the steel ball through the oil. At v = 1.8ms–1, the force F is equal to the difference between the weight of the steel ball and the upthrust acting on the steel ball. Calculate η. Include an appropriate unit. [Show More]

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