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If a person's heart has a power output of 3 W, then what is the heart's...
An electric car is being designed to have an average power output of 4,900 W for...
An electric car is being designed to have an average power output of 4,900 W for 2 h before needing to be recharged. (Assume there is no wasted energy.) (a) How much energy would be stored in the charged batteries? ( answer in J ) (b) The batteries operate on 40 V. What would the current be when they are operating at 4,900 W? (answer in A) (c) To be able to recharge the batteries in 1 h, how much...
An electric car is being designed to have an average power output of 4,200 W for...
An electric car is being designed to have an average power output of 4,200 W for 2 h before needing to be recharged. (Assume there is no wasted energy.) (a) How much energy would be stored in the charged batteries? ____J (b) The batteries operate on 50 V. What would the current be when they are operating at 4,200 W? _____A (c) To be able to recharge the batteries in 1 h, how much power would have to be supplied...
1. Given the Sun's lifetime is about 10 billion years, estimate the lifetime of stars with...
1. Given the Sun's lifetime is about 10 billion years, estimate the lifetime of stars with (a)0.2-solar mass, (-5 x 10yr) (b) 3.0 solar mass, (4 x 10 yr) (c)10.0-solar mass x 10 yr) 2. A star is lying 20 pc from the Sun. The star's position on the sky is observed to move 5 arc sec per year relative to background stars. What is the star's transverse (perpendicular to the line of sight) velocity? If the observed red-shift is...
26. A sodium vapor lamp has a power output of 300 W. If 390 nm is...
26. A sodium vapor lamp has a power output of 300 W. If 390 nm is the average wavelength of the source, about how many photons are emitted per secood? (h 1 nm- 10* m) 6.63 x 10Js, c 3.00x 10* m/s, and a. 10 b, 1021 e, 10s d. 10 27. The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 10* m, how fast must an electron travel...
Question 2 Portugal has a typical insolation of 1000 W/m2. A solar PV plant located there has an ...
Question 2 Portugal has a typical insolation of 1000 W/m2. A solar PV plant located there has an output of 11 MWp. Since the collectors track the sun, the power output is steady at 11 MW from 09:00 to 16:00 Hrs and almost zero outside this time. The lifetime of the system is 20 years with an annual operating cost and total capital investment of €1 million and €75 million, respectively. The cost of capital is 7% p.a. The efficiency...
. A typical commercial wind turbine costs approximately $2 million per MW of installed power and...
. A typical commercial wind turbine costs approximately $2 million per MW of installed power and requires 5.76 TJ per million dollars of energy to manufacture the wind turbine. (a) Calculate the amount of energy that is consumed (i.e. energy invested) in the manufacture ofa 1.5 MW wind turbine, assuming that turbine manufacture requires 5.76 TJ per million dollars spent. (TJ Tera-joules 1012 joules) (b) If the wind turbine has blades that are 40 meters (radius) long and the average...
Electromagnetic Wave Questions 2. Our sun has a power output of roughly 3.87 1026 watts (W)....
Electromagnetic Wave Questions
2. Our sun has a power output of roughly 3.87 1026 watts (W). This energy is transmitted essentially uniformly in all directions. By the time this radiation reaches the Earth, which has an average distance from the sun of 1.50 x 10" m, what is the intensity? (Recall that intensity is defined to be power per unit area). 3. The energy from the sun is primarily in the infrared and visual wavelengths. The following table gives the...
1. (10 points) A combined gas turbine-vapor power plant has a net power output of 45...
1. (10 points) A combined gas turbine-vapor power plant has a net power output of 45 MW. Air enters the compressor of the gas turbine at 100 kPa, 300 K, and is compressed to 1200 kPa. The isentropic efficiency of the compressor is 84%. The condition at the inlet to the turbine is 1200 kPa, 1400 K. Air expands through the turbine, which has an isentropic efficiency of 88%, to a pressure of 100 kPa. The air then passes through...
(3) Solar power for a house 03 W/m2. Sunlight arriving at the surface of the earth has an intensity of about l The roof of a house is 30 ft by 60 ft in size. what is the maximum power arriving at...
(3) Solar power for a house 03 W/m2. Sunlight arriving at the surface of the earth has an intensity of about l The roof of a house is 30 ft by 60 ft in size. what is the maximum power arriving at the roof? (Hint: This will be at noon with the sun directly overhead.) Estimate the average power during daytime on a clear day having 12 hours of daylight (sunrise to sunset) Estimate the average power over a complete...
MIET 2480-Renewable Energy Systems-15 Jun 2019 Quiz 2: Wind Power Adeol Summanleknl Name: Student ID: 1....
MIET 2480-Renewable Energy Systems-15 Jun 2019 Quiz 2: Wind Power Adeol Summanleknl Name: Student ID: 1. You have a wind site with average wind speed of 8.2 m/s over 1 year, how the average power density in the wind is calculated, given density of the wind as 1.225 kg/m3? a. (1.225) (8.23) -338 W/m2 b. The estimated value closest to the actual average power density is calculated knowing the wind speed frequency distribution fi for each wind speed vi measured...
1. Given the Sun's lifetime is about 10 billion years, estimate the lifetime of stars with (a)0.2-solar mass, (-5 x 10yr) (b) 3.0 solar mass, (4 x 10 yr) (c)10.0-solar mass x 10 yr) 2. A star is lying 20 pc from the Sun. The star's position on the sky is observed to move 5 arc sec per year relative to background stars. What is the star's transverse (perpendicular to the line of sight) velocity? If the observed red-shift is...
26. A sodium vapor lamp has a power output of 300 W. If 390 nm is the average wavelength of the source, about how many photons are emitted per secood? (h 1 nm- 10* m) 6.63 x 10Js, c 3.00x 10* m/s, and a. 10 b, 1021 e, 10s d. 10 27. The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 10* m, how fast must an electron travel...
Question 2 Portugal has a typical insolation of 1000 W/m2. A solar PV plant located there has an output of 11 MWp. Since the collectors track the sun, the power output is steady at 11 MW from 09:00 to 16:00 Hrs and almost zero outside this time. The lifetime of the system is 20 years with an annual operating cost and total capital investment of €1 million and €75 million, respectively. The cost of capital is 7% p.a. The efficiency...
. A typical commercial wind turbine costs approximately $2 million per MW of installed power and requires 5.76 TJ per million dollars of energy to manufacture the wind turbine. (a) Calculate the amount of energy that is consumed (i.e. energy invested) in the manufacture ofa 1.5 MW wind turbine, assuming that turbine manufacture requires 5.76 TJ per million dollars spent. (TJ Tera-joules 1012 joules) (b) If the wind turbine has blades that are 40 meters (radius) long and the average...
Electromagnetic Wave Questions
2. Our sun has a power output of roughly 3.87 1026 watts (W). This energy is transmitted essentially uniformly in all directions. By the time this radiation reaches the Earth, which has an average distance from the sun of 1.50 x 10" m, what is the intensity? (Recall that intensity is defined to be power per unit area). 3. The energy from the sun is primarily in the infrared and visual wavelengths. The following table gives the...
1. (10 points) A combined gas turbine-vapor power plant has a net power output of 45 MW. Air enters the compressor of the gas turbine at 100 kPa, 300 K, and is compressed to 1200 kPa. The isentropic efficiency of the compressor is 84%. The condition at the inlet to the turbine is 1200 kPa, 1400 K. Air expands through the turbine, which has an isentropic efficiency of 88%, to a pressure of 100 kPa. The air then passes through...
(3) Solar power for a house 03 W/m2. Sunlight arriving at the surface of the earth has an intensity of about l The roof of a house is 30 ft by 60 ft in size. what is the maximum power arriving at the roof? (Hint: This will be at noon with the sun directly overhead.) Estimate the average power during daytime on a clear day having 12 hours of daylight (sunrise to sunset) Estimate the average power over a complete...
MIET 2480-Renewable Energy Systems-15 Jun 2019 Quiz 2: Wind Power Adeol Summanleknl Name: Student ID: 1. You have a wind site with average wind speed of 8.2 m/s over 1 year, how the average power density in the wind is calculated, given density of the wind as 1.225 kg/m3? a. (1.225) (8.23) -338 W/m2 b. The estimated value closest to the actual average power density is calculated knowing the wind speed frequency distribution fi for each wind speed vi measured...
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