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Imagine a glorious day after you’ve finished school; you are working as a scientist or engineer in a large research laboratory. Most likely you won’t always agree with all the people who work on your team. What would you do if you disagreed with your boss, and your boss was the well-known American hero Thomas Edison? Think of Tesla. In 1882, Edison was known worldwide as the great inventor of the telegraph, phonograph, and incandescent bulb, while Tesla was a 26-year-old immigrant to the United States. Tesla originally worked for Edison, but they didn’t get along and Tesla left in 1885. One of the major disagreements between the two was over the motor: Edison favored the DC motor and Tesla the AC version. In 1888, Tesla gave a presentation to the American Institute of Electrical Engineers, arguing for AC motors and generators. Present a case in favor of the AC motor and generator over their DC counterparts. Be fair in your presentation, listing the pros and cons of both AC and DC.
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Physics for Scientists and Engineers: Foundations and Connections
- 12.57×10-7 Tesla is not a valid option of the answers available to choose.arrow_forwardLet's try a few more examples that relate power and energy. A certain high-efficiency LED light bulb has a power output of 9.20 W. That is, 9.20 J of electric energy is converted to electromagnetic (light) energy and radiated away every second. How much energy is output by the lightbulb if it is left on for a total time of 7.50 hours? In this case, we're relating power to energy change, so we simply use the relationship E t P = Here, instead of work W, we use in the equation E, which is the amount of energy output or converted in the amount of time t. From this, what do we find the total energy output in joules to be? 33120 X x Solve the above equation for the energy E in terms of power P and time t. Remember that 1 W = 1 J/s, so to find the energy in joules, convert the time to seconds first. There are 60 minutes in one hour and 60 seconds in one minute. Jarrow_forwardQI. A capacitor consists of two circular plates of radius a separated by a distance d (assume d a. (A) Use Gauss' Law to find the electric field between the plates as a function of time t, in terms of q(1), a, ɛ, and z. The vertical direction is the k direction. (B)Now take an imaginary flat disc of radius rarrow_forwardYou came home after school and the electricity was out. It was dark, so you grabbed a flashlight. The flashlight doesn’t work; bummer. Why doesn’t the flashlight work? come up with a hypothesis whyarrow_forwardWhat is the conversion factor between Tesla (T) and Gauss(G)? 1T O 1T = = O 1T = 10³ G 104 G 1 × 10² Garrow_forwardOn December 27, 2004, astronomers observed the brightest flash of light ever recorded from outside of our solar system. It came from a highly magnetic neutron star SGR 1806-20 (also know as a magnetar). During the 0.20 s burst, this star released as much energy as our sun would over a period of 250,000 years. If our sun outputs approximately Psun = 3.846x 1026 W, what was the average power output of this magnetar in terms of Psun?arrow_forwardKOREK ۱۲:۰۱ © ZAIN IQ docs.google.com/forms عنوان البريد الإلكتروني * بريدك الإلكتروني Using KVL and KCL find i1 and i2 R1 R2 20Ω 500 R3 i2 100 10V 5V إضافة ملف إرسال لم يتم إنشاء هذا المحتوی ولا اعتماده من قبل Go ogle. الإبلاغ عن إساءة الاستخدام - شروط الخدمة - سياسة الخصوصية نماذج Go oglearrow_forwardwhat is the angle <BAC i.e. the angle between AB and AC.arrow_forwardA high-energy pulsed laser emits a 1.1-ns-long pulse of average power 1.5×1011 W. The beam is nearly a cylinder 2.3x10-3 m in radius and it travels in free space. ▼ Determine the energy delivered in each pulse. Express your answer to two significant figures and include the appropriate units. AU = Submit Part B Erms = Submit Value Provide Feedback μA Determine the rms value of the electric field. Express your answer to two significant figures and include the appropriate units. Request Answer O ■ μA Value Units Request Answer ? Units ?arrow_forwardQ (t) = 3e-0.7t sin() + 0.01 sin(4t) - 0.02 cos(4t) The function Q defined above models the electric charge, measured in coulombs, inside a lightbulb t seconds after it is turned on. Which of the following presents the method for finding the instantaneous rate of change of the lightbulb's electric charge, in coulombs per second, at time t = 4? Q" (4) = -0.213 A B C D Q'(4) = -0.171 Q(4) Q (0) 4-0 = 0.053 Q (4) = 0.194arrow_forwardIn the determination of the capacitance of a capacitor experiment: Use the following data to find the capacitance C. |V(VOLT) |1.2 1.4 1.6 1.8 2 IX0.01 |(Amp) | 1.6 1.8 2 2.3 2.6 f= 50 Hz | Xe = ohm | C = µF. %3Darrow_forwardIn a particular area of the country, electrical energy costs $0.18 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.) (a) How much does it cost to operate an old-style incandescent 60.0-W light bulb continuously for 24 hours? $ (b) A modern LED light bulb that emits as much visible light as a 60.0-W incandescent only draws 8.50 W of power. How much does it cost to operate this bulb for 24 hours? $ (c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for 3.90 hours? $arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning