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Chapter 4: Q11DQ (page 1072)
If a light beam carries momentum, should a person holding a flashlight feel a recoil analogous to the recoil of a rifle when it is fired? Why is this recoil not actually observed?
Yes there is a recoil effect on the person but it is not observed as light carries a very small momentum.
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Ordinary household electric lines in North America usually operate at 120 V . Why is this a desirable voltage, rather than a value considerably larger or smaller? On the other hand, automobiles usually have 12 V electrical systems. Why is this a desirable voltage?
Why does an electric light bulb nearly always burn out just as you turn on the light, almost never while the light is shining?
An alpha particle (a He nucleus containing two protons and two neutrons and having a mass of ) travelling horizontally at enter a uniform, vertical, magnetic field.(a) What is the diameter of the path followed by this alpha particle? (b) what effect does the magnetic field have on the speed of the particle? (c) What are the magnitude and direction of the acceleration of the alpha particle while it is in the magnetic field? (d) explain why the speed of the particle does not change even though an unbalanced external force acts on it.
When switch Sin Fig. E25.29 is open, the voltmeter V reads 3.08 V. When the switch is closed, the voltmeter reading drops to 2.97 V, and the ammeter A reads 1.65 A. Find the emf, the internal resistance of the battery, and the circuit resistance R. Assume that the two meters are ideal, so they don’t affect the circuit.
Fig. E25.29.
A heart defibrillator is used to enable the heart to start beating if it has stopped. This is done by passing a large current ofthrough the body atfor a very short time, usuallyabout . (a) What power does the defibrillator deliver to the body, and (b) how much energy is transferred ?
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