Determine height of arch at its center
The bridge is to be built in shape of the semielliptical arch and is to have the span of 100 feet. Height of arch, at the distance of 40 feet from center, is to be 10 feet. Determine height of arch at its center.
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The electrical force on the pair of charges is 60 N. If those similar charges are moved such that the new force among them is 15 N, determine the new distance among the charges?
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Determine the numbers of calcium are needed to react with the 1.55g of water to make the calcium hydroxide and the hydrogen gas?
The 1.45 g sample of phosphorus burns in the air and outlines the 2.57 g of a phosphorus oxide. Describe the empirical formula of the oxide. Express your answer in detail as a chemical formula.
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Fingernail-polish remover is primarily acetone (C3H6O). Determine the numbers of acetone molecules are in a bottle of acetone with a volume of 405 mL? (the density of acetone =0.788 g/cm3 ).
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