The Beltway Sniper During October 2‚ 2002 a series of murders started to happen around Washington D.C area‚ as well as in the Baltimore area. Five shootings attacks occurred in a fifteen hours period‚ which continued on for another three weeks. People were surrounded by fear and authorities did not have any clues of what or why these shootings were happening. Different messages and signs were left at the scene of the crime by the killer‚ but still nothing solid enough to have any suspects. The
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St. Barbara 8th grade Washington D.C.‚ Trip Friday‚ March 18‚ 2011 Yesterday seemed like today but it was really tomorrow. Confusing but that’s what happens when we go from California to Washington. We got on the plane about nine o’clock‚ landed at three o’clock California time but it was really six o’clock in Washington. So we had to keep going on with the day and me‚ being “smart”‚ didn’t sleep on the way there. So‚ I was basically awake from nine o’clock at night to eleven o’clock at night
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the total circuit current in Figure 5.32a to 50mA. I1=Vs/R1= 12V/300Ω= 0.04 x 10^-3= 40mA I2=It – I1= 50mA – 40mA= 0.01 x 10^-3= 10mA R2=Vs/I2= 12V/10mA= 1200 x 10^3= 1.2kΩ 38. Figure 5.43 shows a potentiometer wired as a current divider. Determine the values of Rab and Rbc that will provide values of I1=4 mA and I2=6 mA. Rab= (4mA/10mA) x 100Ω= .4 x 100Ω= 40 Ω Rbc= (6mA/10mA) x 100Ω= .6 x 100Ω= 60Ω Chapter 6 Practice Problems 18. Determine the value of load power (PL) for the circuit shown in Figure
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make the 555 chip run in the ‘astable’ mode. The pin numbers are given in circles. Note the right-most side of the figure‚ and consider all the connections with the pins as ‘open-circuits’. Ignore the rest of the circuit for a while. D1 - Circuit Connections to be made This over-familiar circuit will majestically jump up. The Vc1 is the driving signal for this 555‚ connected at PIN 6‚ which is the THRESHOLD PIN. As soon as Vc1 reaches ⅔Vcc‚ then the output at PIN 3 goes low‚ and
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Assignment Chapter 7 Circuit Analysis Techniques 15. Derive the Thevenin equivalent of the circuit shown in Figure 7.47a. Req= (R1+R2)//(R3+R4)= 5.2k//1.5k= 1164 x 10^3= 1.2kΩ Rth= Req+R5= 1.2kΩ+1kΩ= 2200 x 10^3= 2.2kΩ Vth= Vs= 9V 16. Derive the Thevenin equivalent of the circuit shown in Figure 7.47b. Req= R1+R2= 22+33= 55Ω Vth= Vs x R3/Req+R3+R4= 12V x 120Ω/55+120+51 = 6.37V Rth= (R1+R2)//(R3+R4)= (22+33)//(120Ω+51Ω)= 41.6Ω 17. Derive the Thevenin equivalent of the circuit shown in Figure 7.48a
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INTRODUCTION During the nineteenth century‚ when power supply was dc‚ dc motors were used extensively to draw power direct from the dc source. The motor speed could be varied by adjusting field current by a rheostat. That was an open loop control. Most of the drives were constant speed and the characteristics could not be matched with a job requirement. A vast development in the dc drives system took place when the ward Leonard Control System was introduced in the 1980s. The system
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Quezon City Polytechnic University of the Philippines Brgy. San Bartolome‚ Quezon City MC-Indicator Motion Calorie Indicator (An investigatory project in Mechanics) Presented by… Group III – Fusion Kristine Hope G. Arenas Tonylet Delfin Edmark Maluping Benerick Cudia Jomari Cortejo Russel Lansang Cyril John Francisco And presented to… Prof. Melody Banga Physics I Instructor Introduction I. Background of the Study The researchers’ aim is to apply a few principles
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up is very less and be easily supplied by the battery of the vehicle. This fact makes it a very easy circuit to setup. Also‚ as the whole set up is digitalized‚ there is no question of mechanical failure or frequent maintenance. If at all any failure does occur‚ the driver can immediately notice the failure of the circuit as no output value is shown on the display. Hence this is a fail-proof circuit‚ where the driver is always kept informed about the actual fuel levels. What makes this a very attractive
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voltage are used to carry information‚ where as with power electronics‚ they carry power electronics becomes the efficiency An inverter converts DC to AC‚ and also changes voltages. In other words‚ it is a power adopter. It allows a battery – based system to run conversional AC appliances director through conventional home wiring. There are ways to use DC directly‚ but for a modern lifestyle you will need an inverter for the vast majority if not all your loads in electrical terms loads are devices
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Janel Mitchell Ms. Winter Honors Civics & Economics B-1 Case name: DC V. Heller A controversial topic came about in the year of 2008. It was concerning whether or not DC’s gun law was following along the lines of the Second Amendment Rights. A man by the name of Dick Anthony Heller was a special police officer and had gone in to register for a handgun for his home. The true underlying issue was whether or not the rights were protected under the Second Amendments which states: The
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