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kWh BTU Question 10 5 pts A 300 W light bulb is turned on 3 hours...
11. How much energy does a 100-W light bulb use in 8.0 hours? (Note: 1kWh =...
11. How much energy does a 100-W light bulb use in 8.0 hours? (Note: 1kWh = 3.6x106 Jor 1kWx 1hour) O 800 kWh O 13 kWh O 0.008 kWh O 0.8 kWh
Question 6 5 pts In room at 20°C, an incandescent light bulb is using 60 W...
Question 6 5 pts In room at 20°C, an incandescent light bulb is using 60 W of electric power. The rate of entropy generated by the light bulb is most closely equal to: 0.2 W/K 3.0 W/K 0.003 W/K 0 0.0 W/K
3. (20 pts) In the Carnot engine (refer to the figure in question 2), an ideal...
3. (20 pts) In the Carnot engine (refer to the figure in question 2), an ideal gas undergoes a cycle of isothermal expansion (A → B), adiabatic expansion (B → C), isothermal compression (C → D), and adiabatic compression (D → A). All processes are assumed to be reversible. The volumes at the points are given that 2VA=VB and VC=2VD. Th is 650 °C and Tc is 30 °C. (1) Calculate the amount of heat added to one mole gas...
4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient...
4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient light-emitting diode (LED) lighting. Estimate the payback period (in years) for replacing a 100 W incandescent light bulb with an LED light that provides the same light output, but consumes only 18 W. Given data .price of electricity- $0.13/kWh assume the light is turned on for 5 hours per day, every day price of incandescent bulb = $1.20 .price of LED S19.10 annual interest...
4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient...
4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient light-emitting diode (LED) lighting. Estimate the payback period (in years) for replacing a 100 W incandescent light bulb with an LED light that provides the same light output, but consumes only 18 W. Given data .price of electricity- $0.13/kWh assume the light is turned on for 5 hours per day, every day price of incandescent bulb = $1.20 .price of LED S19.10 annual interest...
Question 10 5 pts A steam engine converts 1640 million Btu input energy obtained by burning a fuel into mechanical energy. The steam goes into the turbine at 210 °C and condensed water leaves the tur...
Question 10 5 pts A steam engine converts 1640 million Btu input energy obtained by burning a fuel into mechanical energy. The steam goes into the turbine at 210 °C and condensed water leaves the turbine at 21 °C. Assuming that the turbine operates as an ideal Carnot engine determine the mechanical energy output in MWh. Question 11 5 pts Which ones below are the benefits of hydroelectric power generation? O Hydro electric power don't depend on market conditions. Hydroelectric...
3 pts A table saw-powered by an electric motor-was measured to consume 0.2 kilowatt hours (kWh)...
3 pts A table saw-powered by an electric motor-was measured to consume 0.2 kilowatt hours (kWh) of electricity after running for 5 minutes. In this same period of time, it produced 600 kJ of mechanical work. a) What is the average electrical power consumed by the motor? Hint: What are the dimensions of energ b) What is the average mechanical power produced by the motor? c) How much energy is dissipated as thermal energy (i.e. heat) due to friction and...
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light...
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? 1.23E22 photons/s 5.07E21 photons/s 3.62E19 photons/s O 1.52E19 photons/s 0 4.27E19 photons/s
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light...
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? 123E22 photons/s O 5.07E21 photons/s O 3.62E19 photons/s O 1.52E19 photons/s 4.27E19 photons/s
Question 5 2 pts A particular LED bulb emits light with a wavelenth of 8.2 x...
Question 5 2 pts A particular LED bulb emits light with a wavelenth of 8.2 x 10-7m. What is the energy of the photon being emitted? E=hy - hc Use 6.6 X 10-34 J·s for Planck's constant, and 3.0 x 108 m/s for the speed of light. Report your answer as "2 sig digits" x 10-19 J. (Do not include the base, exponent, or units your answer)
11. How much energy does a 100-W light bulb use in 8.0 hours? (Note: 1kWh = 3.6x106 Jor 1kWx 1hour) O 800 kWh O 13 kWh O 0.008 kWh O 0.8 kWh
Question 6 5 pts In room at 20°C, an incandescent light bulb is using 60 W of electric power. The rate of entropy generated by the light bulb is most closely equal to: 0.2 W/K 3.0 W/K 0.003 W/K 0 0.0 W/K
4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient light-emitting diode (LED) lighting. Estimate the payback period (in years) for replacing a 100 W incandescent light bulb with an LED light that provides the same light output, but consumes only 18 W. Given data .price of electricity- $0.13/kWh assume the light is turned on for 5 hours per day, every day price of incandescent bulb = $1.20 .price of LED S19.10 annual interest...
4. a) A building owner is thinking about replacing old-style incandescent light bulbs with more energy-efficient light-emitting diode (LED) lighting. Estimate the payback period (in years) for replacing a 100 W incandescent light bulb with an LED light that provides the same light output, but consumes only 18 W. Given data .price of electricity- $0.13/kWh assume the light is turned on for 5 hours per day, every day price of incandescent bulb = $1.20 .price of LED S19.10 annual interest...
Question 10 5 pts A steam engine converts 1640 million Btu input energy obtained by burning a fuel into mechanical energy. The steam goes into the turbine at 210 °C and condensed water leaves the turbine at 21 °C. Assuming that the turbine operates as an ideal Carnot engine determine the mechanical energy output in MWh. Question 11 5 pts Which ones below are the benefits of hydroelectric power generation? O Hydro electric power don't depend on market conditions. Hydroelectric...
3 pts A table saw-powered by an electric motor-was measured to consume 0.2 kilowatt hours (kWh) of electricity after running for 5 minutes. In this same period of time, it produced 600 kJ of mechanical work. a) What is the average electrical power consumed by the motor? Hint: What are the dimensions of energ b) What is the average mechanical power produced by the motor? c) How much energy is dissipated as thermal energy (i.e. heat) due to friction and...
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? 1.23E22 photons/s 5.07E21 photons/s 3.62E19 photons/s O 1.52E19 photons/s 0 4.27E19 photons/s
Question 10 5 pts How many photons per second are emitted by a 5.5-W LED light bulb, if the emission is at a wavelength of 550 nm? 123E22 photons/s O 5.07E21 photons/s O 3.62E19 photons/s O 1.52E19 photons/s 4.27E19 photons/s
Question 5 2 pts A particular LED bulb emits light with a wavelenth of 8.2 x 10-7m. What is the energy of the photon being emitted? E=hy - hc Use 6.6 X 10-34 J·s for Planck's constant, and 3.0 x 108 m/s for the speed of light. Report your answer as "2 sig digits" x 10-19 J. (Do not include the base, exponent, or units your answer)
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