Pearson Edexcel International GCSE (9–1),. Physics Unit: 4PH1 Paper: 2PR. Latest Revision Guides. Graded A+

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FORMULAE You may find the following formulae useful. energy transferred = current×voltage×time E = I×V×t frequency = 1 time period f = 1 T power = work done time taken P = Wt power = en... ergy transferred time taken P = W t orbital speed = 2 orbital radius time period π × v = 2 r π T × × (final speed)2 = (initial speed)2 + (2×acceleration×distance moved) v2 = u2 + (2×a×s) pressure×volume = constant p1×V1 = p2×V2 pressure temperature = constant p T p T 1 1 2 2 = force = change in momentum time taken F = ( ) mv mu − t change of wavelength wavelength velocity of a galaxy speed o = f light − Δ = = 0 0 0 v c λ λ λ λ λ change in thermal energy = mass×specific heat capacity×change in temperature ΔQ = m×c×ΔT Where necessary, assume the acceleration of free fall, g = 10 m/s2.*P68389A0320* Turn over 3 BLANK PAGE4 *P68389A0420* Answer ALL questions. 1 The diagram shows the temperature-time graph for a substance which is heated at a constant rate. Time P Q R S T Temperature in °C 80 –70 –20 (a) (i) Which section of the graph shows when the substance is melting? (1) A PQ B QR C RS D ST (ii) Which section of the graph shows when all the substance is a solid? (1) A PQ B QR C RS D ST (iii) Draw particles in the box to show the arrangement of particles when the substance is a gas. (1)*P68389A0520* Turn over 5 (iv) Which of these statements best describes the motion of particles in a gas? (1) A they vibrate about fixed points B they are stationary C they slide past each other D they move quickly and randomly (b) (i) Name a piece of apparatus that could be used to measure the temperature of the substance. (1) .................................................................................................................................................................................................................................................................................... (ii) Determine the boiling point of this substance. (1) boiling point = .............................................................. °C (c) The substance has a mass of 1.2 kg. Calculate the energy required to raise the temperature of the substance from 10°C to 37°C. [assume specific heat capacity of substance = 840 J/kg°C] (3) energy = .............................................................. J (Total for Question 1 = 9 marks)6 *P68389A0620* 2 The diagram shows a metal block on top of a wooden block. The metal block is held stationary by force F. wooden block metal block 11 cm P G 4.3 cm force F (a) (i) The weight of the metal block acts through point G. Give the name of point G. (1) .................................................................................................................................................................................................................................................................................... (ii) Name a piece of apparatus that could be used to measure the weight of the metal block. (1) ....................................................................................................................................................................................................................................................................................*P68389A0720* Turn over 7 (b) (i) State the formula linking moment, force and perpendicular distance from the pivot. (1) (ii) The weight of the metal block is 0.68 N. Show that the moment of the weight of the metal block about point P is approximately 2.9 N [Show More]

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