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A (massless) pull-up bar in the gym has a length of L=84.1 cm and is connected to the wall through a joint at the bottom and a horizontal cable attached to the wall a distance d=41.209 cm along the bar from the joint. The bar makes an angle of θ=37.8° with the horizontal. If a feeble physics professor with mass m=85.8 kg hangs vertically from the end of the bar, what is the tension in the cable to keep the system static. Express your answer in Newtons.
Gibbs Free Energy: Spontaneity Elemental carbon usually exists in one of two forms: graphite or diamond. It is generally believed that diamonds last forever.
a railroad car derails and spills 36 tons of concentrated sulfuricacid. the acid is 98.0 mass h2so4 and has a density
Write the chemical equation and the Kb expression for the reaction of each of the following bases with water: ammonia, NH3; hydrogen sulfide, HS- ; hypochlorite ion, ClO-
The total volume of both metals is measured by the displacement of water to be 426 and the total mass is 4.40 . What percentage of the spheres are copper?
How much heat in kilocalories is required to melt 1.0mole of isopropyl alcohol (rubbing alcohol; molar mass = 60.0g/mol )? The heat of fusion and heat of vaporization of isopropyl alcohol are 21.4cal/g and 159cal/g , respectively
Bill's recipe for onion soup calls for 4.0 lb of thinly slicedonions. If an onion has an average massof 115 g, how many onions does Bill need
Why is it impossible for 100% pure ethanol to be obtained from fractional distillation of the fermentation mixture
Calculate w (in kJ) when 538 g iron (III) oxide (MM = 159.7 g/mol) reacts with excess carbon to produce carbon dioxide gas at 479 K: 2Fe2O3(s) + 3C(s) ? 4Fe(s) + 3CO2(g)
When one mole of solid NAOH is dissolved in one liter of solution, 44.5 kJ of heat are released. How much heat is released when 1 gram of NaOH is dissolved in 100.0 mL of water
How might you use 13C NMR spectroscopy to determine if the brominated product is contaminated with some unreacted starting material (during the bromination of trans-cinnamic acid)
Elaborate on why a cyclic product is obtained in good yield instead of a polymer? Between Guanidinium ion and Guanidine, which is the better nucleophile and why? What is the purpose of adding sodium acetate in the reaction mixture
To 1.00 L of a 0.100 M aquoeus solution of the weak base pyridine C5H5N is added 1.00 ml of 14.0 M NaOH. What fraction of the pyridine molecules in the resulting solution react with water to release hydroxide ions? (Kb C5H5N = 1.7 x 10^-9)
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