Use nodal analysis to obtain u, in the circuit in Fig- 3.55.
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- The energy flux from the sun has a peak value of around 1500 W/m2, and solar cells are around 15% efficient. Estimate the area needed to satisfy US energy needs using solar cells, using the estimates that there are about 350 million people in the US and that we use an average of 90 kW/person. Also assume that there are about 6 hours of "peak" sunlight per day. Answer in square kilometers (do not put units in your answer, however).§ 2.10 Clampers Sketch v, for each network of Fig. 2.161 for the input shown. Would it be a good approxima- tion to consider the diode to be ideal for both configurations? Why? 120 V Si -20 V (a) (b) Figure 2.161Consider the generator below with a coil radius of 20mm and effective length of 3cm. > Given that the wire comprises of 130 turns :- What is the flux donn't D+
- The half-wave rectifier in Figure 2–19 has a 250-μF filter capacitor and a 1.5-kOhm load. The ac source is 120 V rms with frequency 60 Hz. The voltage drop across the silicon diode is 0.7V. Assuming light loading, find (d) plot vin(t), vR(t) (output without the filter cap) and vL(t) (output with the filter cap) all on the same graph(2.9) The magnetic susceptibility of platinum is 2.61×10−4, The density of platinum is 21450 kg m-3 and its relative atomic mass is given by 195.09 g mol-¹. Calculate its molar susceptibility (in m³ mol-¹) and its mass susceptibility (in m³ kg-1). Using Appendix A, translate these results into cgs units to find the molar susceptibility in emu mol-¹ and the mass susceptibility in emu g-¹. To understand why the magnetic susceptibility of platinum, a metal, is temperature independent (in contrast with Curie's law), see chapter 7.REMARKS The answer to part (b) is only an estimate because the temperature coefficient is, in fact, temperature dependent. As the temperature rises, both the rms speed of the electrons in the metal and the resistance increase. QUESTION What happens to the drift speed of the electrons as the temperature rises? (Select all that apply.) It becomes larger, so that the resistance decreases and current increases. It remains the same. It becomes smaller because the atoms of the metal vibrate more strongly and interfere more with electron drift motion. It becomes larger because the electrons become more energetic and move faster. It becomes smaller, so that the resistance increases and current decreases. PRACTICE IT Use the worked example above to help you solve this problem. A resistance thermometer, which measures temperature by measuring the change in resistance of a conductor, is made of platinum and has a resistance of 50.0 2 at 20.0°C. (a) When the device is immersed in a vessel…