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A playground merry-go-round (mass M=78.4 kg, R=2.578 m) is initially rotating with an angular speed of ω=0.805 rad/s.To enhance the fun, a small rocket is attached to the edge of the merry-go-round and fired for t=7.38 s, exerting a force of F=193.4 N in the horizontal direction so that the merry-go-round speeds up. Assume the merry-go-round can be modelled as a disk. What is the new angular speed of the merry-go-round? Express your answer in rad/s.
an analytical lab needed to determine the content of phosphorus in a commercial sample of plant food. the phosphorus in
At a certain temperature, reaction has equilibrium constant (Kc) of 1.9 x10^19. Determine the equlibrium constant for the reaction based on this information at the same temperature.
Calculate the reaction rate for each of the three trials. Determine the order of the reaction with respect to NO2.
Write the reaction for the hydrolysis of propionyl propionate (an ester) -- that is, the reaction of this ester with water, yielding a carboxylic acid and an alcohol.
You have a radiocarbon sample analyzed and find out that the sample has 60% of the modern level of radiocarbon. Calculate the radiocarbon age of the sample using an assumed 5730-year half-life.
Write the equations for the following reversible systems A) solid KMnO4 in a saturated aqueous solution of KMnO4 B) a mixture of solid and gaseous forms of CO2 in a closed container
A solid laboratory sample contains two substances, lead(II) carbonate and potassium carbonate. A 5.000 g sample of this unknown was treated with aqueous nitric acid to dissolve it, then, after further treatment to adjust the acidity
A solution of 48.6% H2SO4 by mass has a density of 1.39 g/cm3 at 293 K. A 23.2 cm3 sample of this solution is mixed with enough water to increase the volume of the solution to 99.8 cm3. Find the molarity of sulfuric acid in the obtained solution.
Problem- Consider the titration of a 25.0 mL sample of 0.110M HC2H3O2 with 0.120 M NaOH. Determine each of the following. the pH after adding 6.00mL of base beyond the equivalence point
what mass of this substance must evaporate in order to freeze 230g of water initially at 16 degrees? the heat of fusion
Calculate the molar solubility of calcium hydroxide in a solution buffered at each of the following pH's.
Equilibrium system given: Fe3+(aq) + SCN- (aq) FeSCN2+(aq) 1. Equilibrium system Net ionic equation 2. Equilibrium system + 1M Fe(NO3)3 Net ionic equation What stress caused the equilibrium to shift and in which direction it shift
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