Sunday
December 8, 2013

# Posts by Erin

Total # Posts: 547

physics
A 9.1 g ball is hit into a 98 g block of clay at rest on a level surface. After impact, the block slides 8.0 m before coming to rest. If the coefficient of friction is 0.60, determine the speed of the ball before impact.

trigonometry
an automobile tire has a diameter of 36 inch.how many revolution will the wheel make an arc the automobile travels 1 mile (5280 A)?

chemistry
I am given the concentration of HClO4 and a pressure for H2... how do i plug either of the givens into the equation youve shown??

chemistry
calculate the reduction potential for hydrogen ion in a system having a perchloric acid concentration of 2.00 x 10^-4 M and a hydrogen pressure of 2.50 atm.

chemistry
will fe3+ oxidize Sn2+ to Sn4+ in acidic solution?

chemistry
the time is supposed to be 4.6 hours. i am not having problems getting the mass of Cu, i am just struggling with how to find how long it will take.

chemistry
i get 4.76 x 10^-5 mol CaC2o4.. squaring the answer gives me a ksp= 2 x 10^-9 is this right?

chemistry
a liter of a solution saturated at 25C with CaC2O4 is evaporated to dryness giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, and the molar solubility and the solubility product constant for this salt at 25C. Show the balanced reaction.

Elementary Statistics
1) Construct a confidence interval of the population proportion at the given level of confidence. x=60,n=300, 99% confidence. The 99% confidence interval is (_,_) 2) A researcher wishes to estimate the proportion of adults who have high-speed internet access. What size sample ...

World History
Who ruled the Byzantine Empire?

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