When an eight-cylinder engine is running at 3,000 rpm, its ignition coil must do remarkable things. If a single coil is used, its magnetic field must be able to build up and collapse 200 times in 1 second.
Answer the following statement true (T) or false (F)
True
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Which four elements compose 96 percent of Earth's total mass?
a. oxygen, carbon, hydrogen, and iron b. oxygen, silicon, nitrogen, and aluminum c. carbon, iron, nitrogen, and silicon d. oxygen, nitrogen, hydrogen, and carbon
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Food is much easier to prepare since the invention of _____
a. the refrigerator c. the pressure cooker b. the freezer d. pesticides
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Corresponding sides of similar polygons are proportional.
Answer the following statement true (T) or false (F)
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When native prairie soils are brought under cultivation, the fraction of soil organic matter which disappears most quickly is the passive fraction
Indicate whether the statement is true or false
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