Find work that person of given mass must do to climb
Calculate the work that a person of mass 65kg must do to climb betweencalculate the work that a person of mass 65kg must do to climb between two floors of a building seperated by 4.0m.
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How much energy (in kilojoules) is released when 33.0 {rm g} of ethanol vapor at 95.0^circ {rm C} is cooled to -19.5^circ {rm C}?
A 20.0-mL sample of 0.400 M HBr solution is titrated with 0.400 M NaOH solution. Calculate the pH of the solution after the following volumes of base have been added.
find the rate of formation of the ammonium ion the instant 100 cm3 of 0.15 M ammonia is mixed with 100 cm3 of 0.10 M nitric acid.
How many grams of sodium lactate must be added to a 1.00L solution of .400M lactic acid to make a buffer with a pH of 3.7 ?
Which is amajor source of air pollution and a substantialcontributor to acid rain. What mass of Fe2O3 is produced from 85 L of oxygen at 3.73 atm and 143 C with an excess of iron pyrite?
A mixture of Ar and N2 gases has a density of 1.592 g/L at STP. What is the mole fraction of each gas?
A gaseous reaction occurs at a constant pressure of 35.0 atm and releases 65.0 kJ of heat. Calculate the total internal energy change, Delta U, in kilojoules.
If a sodium hydroxide solution were added to a solution containing lead(II) ions, sodium ions, nickel(II) ions and potassium ions, which ion(s) would remain in the supernatant?
How efficient is the extraction of the tea leaves containing 1.0 g of caffeine with the two 3 mL portions of chloroform over that of a single-step reaction?
A 20.0-rnL portion of pineapple juice was placed in a flask with 20 mL of 0.5M H2S04, Then 2 g of potassium iodide and 20.17 mL of 0.02001M potassium iodate were added to the sample. Titration with sodium thiosulfate required the use of 18.94mL of
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