A hot wire radiates heat at 100 Watts. If its temperature measured in degrees Kelvin is doubled, then the power radiated will be what? Select one: a. 100 W b. 200 W c. 800 W d. 1600 W e. none of these
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- II. Power A. Sample Problems: 1 W-500 Joules t=25 seconds P=? 1 P=25 watts W-5000 Joules t=? 1 P=170 watts t=20 seconds W = ? bons Formula: Substitution: Answer with unit of measure: Formula: Substitution: Answer with unit of measure: Formula: Substitution: Answer with unit of measure: how I msidor siqma2 A 21519m 02-b W 1 If a man moves a large box that weighs 10 Newtons 20 meters in 30 seconds, how much power was used?4. Assuming a filament in a 100 W light bulb acts as a perfect blackbody (e = 1). what is the temperature of the hottest portion of the filament if it has a surface area of 6.3 105 m²? The Stefan-Boltzmann constant is 5.67 x 10-8 J/(s. m². K*). a) 130.8 K b) 1100.21 K c) 2300.21 K d) 5800.5 K 5. During an evening news broadcast in Helsinki, Finland, the meteorologist indicated that the day's lowest temperature was -6.0 °C. The corresponding value of this temperature on the Fahrenheit scale is ........ a) -7.2 °F b) 4.0 °F c) 21.2 °F d) 25.5 °FThermal emission from forehead. Noncontact thermom- eters are used to quickly measure the temperature of a person, to monitor for fever from an infection. They measure the power of the radiation from a surface, usually the forehead, in the infrared range, which is just outside the visible light range. Skin has an emissivity & = 0.97. What is the total power (infrared and vis- ible) of the radiation per unit area when the temperature is (a) 97.0°F (a common early morning temper- ature), (b) 99.0°F (a common late afternoon temperature), and (c) 103°F (a temperature indicating infection)? ww 36.8
- 1,1 46 K/s .l OMANTEL A:1. elearn.squ.edu.om/mod/quiz/attem ---- - الوقت المتبقی 0:19:49 سؤال 2 غير مجاب عليه بعد الدرجة من 0 1.0 علم هذا السؤال The center of gravity coincides with the :center of mass إختر أحد الخيارات always .a if the center of mass is at the geometrical .b center of the body never .C if the acceleration due to gravity is uniform .d over the body if the body has a uniform distribution of mass .e الصفحة التالية الصفحة السابقة تنقل الاختبار Maadh Al NoutakiOpen the photoWhat is the expression for heat current? Q is heat, t is time, T is temperature. a) ΔQ/Δt b) ΔQ/ΔT c) ΔT/Δt d) ΔQ/ΔTΔt
- Integrated Concepts (a) Calculate the rate in watts at which heat transfer through radiation occurs (almost entirely in the infrared] from 1.0 m2of the Earth’s surface at night. Assume the emissivity is 0.90, the temperature of the Earth is 15°C, and that of outer space is 2.7 K. (b) Compare the intensity at this radiation with that coming to the Earth from the Sun during the day, which averages about 800 W/m2, only hall of which is absorbed. (c) What is the maximum magnetic field strength in the outgoing radiation, assuming it is a continuous wave?Q5. The intensity of the solar radiations striking the PV panel of a solar powered car is found to be 900W/m2 and the dimensions of the PV panel fixed over the roof of a solar powered car is given below. Assuming efficiency of the PV panel to be 30% solar p.v 2.2 m (a) Find the area of PV panel fixed over the roof of the car? (b) Calculate the power of incident solar radiations? (e) Find the power out of the PV panel? 1.1m3. Write your understanding about the Solar flat plate collectors and Solar evacuated tubes. Clearly mention the difference in the working principle and choose which is best suitable for Oman.
- B2A hot water bottle is filled with either water or vegetable oil. It is placed in the microwave until the temperature increases by 60°C. Using the data below, answer the questions. Recall the specific heat equation: energy = mass × SHC × temperature change Mass of water in bottle Mass of oil in bottle .3 kg .2 kg Specific heat capacity of water ...4200 J/kg°C Specific heat capacity of oil ....1600 J/kg°C © Photos.com 2016 1. Calculate the energy stored in the water-filled bottle. Answer:5 part A: If u(C) = 0.2C. What in the uncertainty of a 500 mF capacitor in mF? 5 Part B: If C = 500 mF and R = 8000 W , and V = 5 V. What is the voltage across the resistor in an RC circuit if it started out fully charged and the time since we started charging 6 seconds ago?