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Use signal-to-noise ration = 10 lg(P1/P2) with P1 as the signal and P2 as the noise) b Calculate the minimum input signal power to the fibre. A loudspeaker which emits a note of frequency 300 Hz is whirled in a horizontal circle at a speed of 20 m s −1. Describe the graph obtained when the wavelength λ of the sound wave is plotted against the frequency f of the tuning fork.
A charged sphere can be considered to behave like a point charge where all of the charge is concentrated at the centre of the sphere. In fact, the pressure at the surface of the liquid is atmospheric pressure, due to the atmosphere above. linear momentum: the product of mass and velocity principle of conservation of momentum: within a closed system the total momentum in any direction is constant Newton’s first law of motion: an object will remain at rest or keep travelling at constant velocity unless it is acted on by a resultant external force Newton’s second law of motion: the net force acting on an object is equal to the rate of change of its momentum. Then the process goes into reverse and the second mass gradually slows down while the first mass starts to swing again. d Explain why a satellite dish on Earth in line-of-sight with a geostationary satellite is fixed in position.c Calculate the distance on the screen between the middle of the central fringe and the middle of the first dark fringe. b Explain, using ideas about diffraction why this pattern becomes less bright towards the edge of the screen. An isotope of phosphorus 30 decays by emitting a beta-minus-particle (β− or −10e) and an 15P electron antineutrino (ν) to form a Si nucleus.
We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Calculate the six possible values for the total resistance of the circuit and describe each combination of the resistors. Resistivity and resistance: harder problems This exercise gives you practice in some harder examples where you have to use R = ρl . In an experiment using double slits, eight fringe spacings on the screen are found to occupy a distance of 0.At the start of the experiment, one mass is pulled forwards and released so that it swings back and forth. Add an arrow to your diagram to show the approximate direction of the resultant force on the particle. d Show the resultant displacement if the original and the wave in part c pass through the same point. For example: if an aircraft is flying NE at 300 m s−1, calculate the component of its velocity in the direction due east. You need to calculate the KE before and the KE after the change; do not be tempted to calculate using the change in speed.
But first you must be able to identify the forces acting on an object and represent them on a free body diagram. Other components For this exercise, you need to know the I−V characteristic graphs for a diode and for a filament lamp, and some reasons why these graphs are not straight lines.a Copy the diagram onto a piece of graph paper, leaving enough space below for three similar diagrams. m The gravitational potential ϕ in the field of a point mass is given by φ = − GM r a State the meaning of each of the symbols G, M and r.
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