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A sealed journal bearing is formed from concentric cylinders. the inner and outer radii are 25 and 26 mm, the journal length is100 mm, and it turns at 2800 rpm. The gap is filled with oilin laminar motion. The velocity profile is linear across thegap. The torque needed to turn the journal is 0.2 N*m. Calculate the viscosity of the oil. Will the torque increaseor decrease with time? Why?
Urea { (NH2)CO } is used for fertilizer supplyingnitrogen to the soil. Calculate the number of N atoms foundin 1.68 * 10^4g of urea.
Magnesium oxide decomposes into magnesium and oxygen. If 12.09 of magnesium oxide decomposes to form 7.29 of magnesium, what mass of oxygen gas is also released in the reaction?
Calculate the delta G at 400K for the following phase change: Sulfur(monoclinic) to sulfur rhombic. Do not assume that delta H or delta S are independent of temperature
based on the ionization energies of the alkali metals which alkalimetal would you expect to undergo the least
Identify the elements that correspond to the following atomic numbers. label each as a noble gas ? a halogen ?an alkali metal? an alkaline earth metal? a transition metal? a lanthanide metal? or an actinide metala 17 b 4 c 63 d 72 e 2 f 92 g 55
Suppose 50 mL of 0.020 M Hydhrochloric acid solution was mixed to 50 mL of 0.20 M acetic acid solution (Ka of acetic acid, CH3COOH, = 1.8 x 10-5). Determine the approximate pH of the mixture.
At 1 atm, how much energy is required to heat 83.0 g of H2O(s) at 2.0°C to H2O(g) at 131.0°C
question covalent modification of enzymes is an important means of regulation. explain the steps by which
Two methods for determining Hg in coal fly ash using atomic absorption were used to see if both methods would give the same results. In the first method only HNO3 is used for digestion,
Consider a sample of helium gas at 28 C with a volume of 3.80 L at a pressure of 3.15 atm. The gas expands to a volume of 9.50 L and the gas is heated to 43 C
Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere.
Problem- Titanium metal is obtained from the mineral rutile, TiO2. How many kilograms of rutile are needed to produce 95kg of Ti
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