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Why are people more likely to use solar water heaters in Israel than Alaska?

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it the minimum average power? 13. An energy-efficient fluorescent lightbulb operating at power Pı = 28 W can produce the same level of brightness as a conventional incandescent lightbulb operating at power P, 100 W. Lifetime of the energy-efficient bulb is T = 10000 h, and its purchase price is B1 = $4.50. Lifetime of the conventional bulb is T2 = 750 h, and its purchase price is B2 = $0.42. Suppose electrical energy costs R = $0.20/kWh, i.e. 20 cents per kilowatt- hour. a) Calculate the total cost of using energy-efficient bulbs over 10,000 hours. b) Calculate the total cost of using conventional bulbs over 10,000 hours. Note that you must include both the cost of purchasing the bulbs and the cost of energy.
The United States has a lot of federally owned land. Unfortunately, uncontrolled natural forest fires destroy large areas in the western US every summer. In 2002, about 1,000,000 acres of standing timber in national forests were consumed. Some consideration is being given to improved management practices that could produce electric power from residual forest thinning. Estimate the lost energy content of burned US forests during 2002. Assuming the US average electricity demand is about 300,000 MWe, how much forested land would be needed to produce all the country's power? Is this a sustainable alternative? How would you manage the forest lands needed? A few facts to consider: • The total forested area on US federal lands in the lower 48 states is about 600 million acres with a standing stock density of about 100 dry metric tonnes of wood per acre, • ● Woody plants and trees capture solar energy via photosynthesis at an average rate of about 0.8 W/m2 which corresponds to producing about…
A 300 W immersion heater is placed in a pot containing 2.00 L of water at 20°C. (a) How long will the water take to rise to the boiling temperature, assuming that 70.0% of the available energy is absorbed by the water? (b) How much longer is required to evaporate half of the water? (a) Number i (b) Number i Units Units
The number of cycles generated per second by a source is called the frequency of the source, true or false?
An electric water heater is designed to produce 48 kWkW of heat when it is connected to a 240-V source. If the heater is 88 %% efficient, how long would it take to heat 51 galgal of water from 20∘C∘C to 60 ∘∘? Express your answer using two significant figures.
Will A or B have a greater change in kinetic energy or will they be equal?
1 WH = A) 360 joules B) 36000 joules C) 3600 joules D) 36 joules
Three 105.0-g ice cubes initially at 0oC are added to 0.900kg of watter initially at 21.5oC in an insulated container. What is the mass of unmelted ice, if any, when the system is at equilibrium?
Assume our atmosphere absorbs 23% of the incoming solar radiation, and that the distance from the Earth to the Sun is 1.5 × 1011 m. From this information, what do you expect is the total power output of the sun? [IMPORTANT: to express a number like 2 × 1021, type 2e21] Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here W Part b How much solar energy do you absorb after sunbathing for an hour? Assume your skin has an exposed surface area of approximately 1.2m², and you absorb 50% of the incident energy. Give your answer in megajoules.