Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 2DQ
What energy sources on Earth cannot be thought of as stored sunlight?
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The best solar panels currently available are about 19% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity per day (1 kWh=1 kilowatt hour; 1kW=1000J/s). Assuming 8.1 hours of useful sunlight per day, calculate the minimum solar panel surface area necessary to provide all of a typical home’s electricity. The energy rate supplied by the sun is 1.0kJ/s times meters squared .
Area = meters squared
The sun doesn’t shine as brightly in winter as it does in summer. This means that in winter you won’t generate enough to fulfil your energy needs whilst you have a surplus of energy in summer. It is therefore necessary to place a battery in your house to store the extra energy. If we assume that we generate 66% of our total energy in the months April to September and that we use equal amounts of energy throughout the year. How much electricity must we store over these 6 months to use in the other half of the year? Give your answer in 3 significant figures. Remember we use 2990kWh of electricity per year.
On average, would Earth be warmer or cooler without the atmosphere? Explain your answer.
Chapter 7 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 7 - Prob. 1RQCh. 7 - What evidence can you give that granulation is...Ch. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - Prob. 5RQCh. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - Prob. 9RQCh. 7 - Prob. 10RQ
Ch. 7 - Prob. 11RQCh. 7 - How can solar flares affect Earth?Ch. 7 - Prob. 13RQCh. 7 - Prob. 14RQCh. 7 - Prob. 15RQCh. 7 - Prob. 16RQCh. 7 - Prob. 17RQCh. 7 - Prob. 18RQCh. 7 - Explain why the presence of spectral lines of a...Ch. 7 - What energy sources on Earth cannot be thought of...Ch. 7 - What would the spectrum of an auroral display look...Ch. 7 - Prob. 4DQCh. 7 - The radius of the Sun is 0.7 million km. Examine...Ch. 7 - Prob. 2PCh. 7 - Prob. 3PCh. 7 - If a sunspot has a temperature of 4200 K and the...Ch. 7 - How much energy is produced when the Sun converts...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - The United States consumes about 2.51019 J of...Ch. 7 - Prob. 10PCh. 7 - Prob. 1LTLCh. 7 - Prob. 2LTLCh. 7 - Prob. 3LTL
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- The Earth constantly receives radiant energy from the sun and gets warmed up. Why does the Earth not get as hot as the Sun is?arrow_forwardHow many hours of sunlight does it take to capture the same amount of energy stored in 1 L of petrol, if instead of using a tree we use a solar panel?Assume: a tree takes up around 30 m2 of land area; we have a solar panel with the same area as that taken up by the tree; 1 L of petrol contains 34.2 MJ of energy; a solar panel captures energy at an average rate of 50 W/m2 for 12 hours a day. How many hours does it take to capture the required amount of energy? Give your answer to one significant figure.arrow_forwardThe sun doesn't shine as brightly in winter as it does in summer. This means that in winter you won't generate enough to fulfil your energy needs whilst you have a surplus of energy in summer. It is therefore necessary to place a battery in your house to store the extra energy. If we assume that we generate 66% of our total energy in the months April to September and that we use equal amounts of energy throughout the year. Question: How much electricity must we store over these 6 months to use in the other half of the year? Give your answer in 3 significant figures (link). Remember we use 2990 kWh of electricity per year. Write down your answer as you need it for the next question Solution: kWharrow_forward
- (W/m), in Santa solar radiation into energy- solar radiation (w/m?) 400 300 200 100 time (hrs past midnight) 4 8 12 16 20 ot dengndi loarrow_forwardCompare the total energy radiated by your body in one day (expressed in kilocalories) to the energy in the food you eat. Why is there such a large discrepancy?arrow_forwardSuppose the average solar energy incident on the green canopy (leaves) of a tree were 10 J per day. The calorific value of the wood obtained from this tree is 15 kJg. If the tree could convert 1% of incident solar energy as wood, how many days will it take to produce 10 kg of wood?arrow_forward
- Northeastern Canada and much of Europe receive about the same amount of sunlight per unit area. Why, then, is Europe generally warmer in the winter?arrow_forwardEarth’s average global temperature is Te=288K. What is the total radiation per unit area required to maintain this temperature?arrow_forwardHow much time does the Sun need to melt a 10 cm thick layer of ice at temperature of 0.0°C? Note that 95% of the solar energy is reflected by the ice.arrow_forward
- If the sun’s radiation was to increase by 10%, Energy emitted by the Earth’s surface wouldarrow_forwardAt the beach, you can get a sunburn while under the shade of an umbrella. What is your explanation?arrow_forwardA bulb delivers 40 W of radiant energy when its filament is at 2500°C. If the temperature increases by 400°C, what is the new rate of energy radiated by this bulb?arrow_forward
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