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December 2020

The mean velocity

A pitot tube is used to measure the mean velocity in a pipe where water is flowing. A manometer containing mercury ia connected to the pitot tube and indicates a height of 150 mm. The specific weights of the water and mercury are 9810 N/m³ and 133,400 N/m³, respectively. Calculate the velocity of the water?A.

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Molecular formula

Determine whether the sentence is a statement or not, “91 is a prime number”. Write the empirical formulas for (a) glucose, a substance also known as either blood sugar or dextrose—molecular formulaC6H12O6; (b) nitrous oxide, a substance used as an anesthetic and commonly called laughing gas—molecular formula N2O.

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Surface area

A flat plate solar collector glass with a surface area of 1.9 m² has direct solar radiation of 789 W / m². If the effective absorptance-transmittance factor is 0.95, the average collector absorber surface temperature is 62 ° C, the water outlet temperature of the collector is 40 ° C and the collector efficiency is

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Excess

 if you react 0.11 g Mg with excess HCl, how many grams of H2 will be produced?Mg (s) +  2 HCl (aq)    à      MgCl2 (aq) +   H2 (g) One hectare is defined as 1.000 x 104 m2. One acre is 4.356 x 104 ft2. How many acres are in one hectare?

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Titration

A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data​ set, his height converts to the z score of 5.17. How many standard deviations is his height above the​ mean? Define the end point of a titration: a) It is a synonym for equivalence point b)

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Orbit

What product is formed when CH3OCH2CH2C ≡ CCH2CH(CH3)2 is treated with each reagent: (a) H2 (excess), Pd-C; (b) H2(1 equiv), Lindlar catalyst; (c) H2 (excess), Lindlar catalyst; (d) Na, NH3? The earth is closer to the sun in November than in May. In which of these months does it move faster in its orbit? Explain

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