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More about phase difference This exercise focuses on phase difference and how it can be shown in wave diagrams. The definition of gravitational field strength g says that its value is the force acting per unit mass acting near a body of mass m. Cambridge International AS and A Level Physics Workbook with CD-ROM (Cambridge International Examinations) [2 ed. Discovering the structure of the atom In this exercise you will discover how we know that an atom has a small central, positive nucleus. Iestyn Morris studied Physics at Aberystwyth before being awarded the Sir Granville Beynon prize there and graduating with first class honours for his degree.

Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press. Calculating the momentum of an object is not difficult, but remember that momentum is a vector quantity. State the speed of a β+ -particle and the speed of a particle of γ-radiation, each of which has approximately the same energy as the β− -particle. c Copy the diagram and add an arrow (labelled v) to each image of the object to represent its velocity. Electrical power and energy This exercise provides practice in using several electrical formulae for power.c Rearrange the equation to give an expression which has the form of ‘the difference of two squares’. a Draw a free body diagram to show the forces acting on the ball when it is moving upwards at point A. Note that, although there will be an upward force on each of the car’s wheels, we can represent this as a single upward force. Remember, force and field strength are vector quantities so it is necessary to take account of their directions.

You should describe any similarities and differences in the amplitude and in the phase difference between the points. d Calculate the work done on the child by this force as she moves from the top of the slide to the bottom. d Show that the component of the skier’s weight at right angles to the slope is equal to the contact force. If a capacitor is charged and then connected across a resistor, a current will be established in the circuit.Remember the stationary wave is not moving along – some of the points on it are just moving up and down and some points do not move up and down at all, they stay as zero all the time c Calculate the wavelength of the wave. 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). Now repeat with four circles out from Q and five from P and also 3 2 circles out 1 from Q and 4 2 circles out from P, and so on. Wave intensity, measuring time and the electromagnetic spectrum This exercise involves some more complex ideas, such as intensity, the electromagnetic spectrum and using the time base on an oscilloscope to measure a time.