Title 9702_s25_qp_42 - Crack A Level.pdf ✅

5 © UCLES 2025 9702/42/M/J/25 [Turn over (ii) Calculate the period of rotation of the small cog. period = ...................................................... s [2] (iii) Show that the distance moved by point X on the chain during one full rotation of the small cog is 0.24m. [1] (iv) Use the information in (b)(iii) to determine the angle through which the large cog rotates during one full rotation of the small cog. angle = ................................................... rad [2] (c) The chain of the bicycle in (b) is moved onto a smaller cog fixed to the rear wheel. The speed of the bicycle does not change. Explain, without calculation, the effect of this change on the angular speed of the pedals. ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................. [2] [Total: 10] * 0000800000005 * , , ĬÏĊ3⁄4Ġ ́íÈõÏĪÅĊàù·Ā× ĬÇðôÙĦĞõåăĆĂÉÓĨēĕĂ ĥÅõĕμÕąμÅÅåÅąĕÅμĕÕ DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DFD
6 © UCLES 2025 9702/42/M/J/25 2 (a) (i) State what is represented by a gravitational field line. ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (ii) The Earth may be considered as a uniform sphere, as shown in Fig. 2.1. Earth Fig. 2.1 On Fig. 2.1, draw field lines to represent the Earth’s gravitational field outside the Earth. [2] (b) The Earth’s magnetic field may be considered as being due to the Earth acting as a long solenoid, as shown in Fig. 2.2. Equator axis of rotation solenoid magnetic pole magnetic pole Fig. 2.2 The magnetic poles do not align with the geographic poles, which are on the axis of rotation. * 0000800000006 * , , ĬÑĊ3⁄4Ġ ́íÈõÏĪÅĊÝù¶þ× ĬÇïôÖĠĆïÝĈ÷ûéëą»ĥĂ ĥĕÕĕμõąĕąåąÅÅĕĥõÅÕ DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DFD