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A-Level Physics: AQA Year 1 & 2 Exam Practice Workbook - includes Answers: superb for the 2024 and 2025 exams (CGP AQA A-Level Physics)

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Equation 2 can be found by imagining that an object moves at a constant velocity equal to its average velocity. Now picture an explosion in which a stationary object splits into two parts that move away from each other in opposite directions. TIP In calculating X, you can ignore the contact force C because it acts at the pivot, the point about which we are taking moments. Angles in radians can be calculated knowing the length s of the arc subtended by the angle and the radius r of the circle: θ = rs .

ii State whether the frequency of the vibrator must be increased or decreased to form the same stationary wave pattern on the string as shown in the diagram. The available apparatus includes a battery, a switch, a variable resistor, an ammeter and a voltmeter.a What can you say about the total volume of the particles compared with the total volume of the box? Kirchhoff’s laws and conservation This exercise tests your understanding of Kirchhoff’s laws and how they relate to conservation of charge and energy.

d The signal wave causes the frequency of the modulated wave to change from the maximum to the minimum and then back to the maximum frequency 20 times a second. d You can estimate the maximum acceleration as follows: lay a ruler on the graph so that it lies along the steepest slope of the graph (at t = 12 s). When the length of the air column is 4λ , a stationary sound wave is produced with one node and one antinode.More about phase difference This exercise focuses on phase difference and how it can be shown in wave diagrams.

c In the diagram, starting from the open end, there is a sequence ANANANA of antinodes and nodes, where A is an antinode and N is a node. The x-axis measures time so find the number of divisions or squares for one cycle and then use the ‘timebase’ of 0.In practice, the force needed to compress the gas would increase as the piston is pushed downwards (because the pressure of the gas would increase). Applying Kirchhoff’s second law to more complex circuits In this exercise, you will need to apply Kirchhoff’s second law to more complex circuits.

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