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| Mixtures | 12 mins | 0 completed | Learn Summary |
| Scientific Notation | 6 mins | 0 completed | Learn |
| Accuracy & Precision | 5 mins | 0 completed | Learn |
| Standard Deviation, Mean, Median & Mode | 7 mins | 0 completed | Learn |
| Metric Prefixes | 17 mins | 0 completed | Learn Summary |
| Significant Figures | 18 mins | 0 completed | Learn Summary |
| Energy, Heat and Temperature | 7 mins | 0 completed | Learn Summary |
| Physical & Chemical Changes | 7 mins | 0 completed | Learn Summary |
| Dimensional Analysis | 28 mins | 0 completed | Learn |
| Density | 14 mins | 0 completed | Learn Summary |
| End of Chapter 1 Problems | 51 mins | 0 completed | Learn |
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| Types of Energy |
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| The Scientific Method |
| Physical & Chemical Properties |
The total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking Earth provides 1.336 kW per square meter (assuming no clouds). The surface area of Earth is approximately 197,000,000 square miles.
What percentage of the Earths surface would we need to cover with solar energy collectors to power the planet for use by all humans? Assume that the solar energy collectors can only convert 10 % of the available sunlight into useful power.
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