Recent content by N_L_

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Homework Statement What is the final pH of a solution obtained by mixing 200 ml of 0.400 M NH3 with 300 ml of 0.100 M HCl? (Kb = 1.8 x 10^-5) Homework Equations The Attempt at a Solution I used an ICE table and came up with 9.68. Is that correct? Should I have used two ICE tables instead...

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Suppose a power plant delivers energy at 980 MW using steam turbines. The steam goes into the turbine superheated at 625 K and deposits its unused heat in river water at 285 K. Assume that the turbine operates as an ideal Carnot engine. If the river flow rate is 37 m^3 / s, estimate the average...

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The burning of gasoline in a car releases about 3.0 x 10^4 kcal/gal. If a car averages 41 km/gal when driving 90 km/h, which requires 25 hp, what is the efficiency of the engine under those conditions? I think I have an answer, but I'm not sure if it's correct. 1 horsepower = 746 watts...

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P absolute = P gauge + P atmospheric = 13,800 kPa + 101 kPa = 13,901 kPa PV = k If I don't need to know k, how to I use the equation?

Does that work for gauge pressure? Thank you.

A standard cylinder of oxygen used in a hospital has the following characteristics at room temperature (295 K): gauge pressure = 13,800 kPa (2000 psi), volume = 16 L (0.016 m^3). How long will the cylinder last if the flow rate, measured at atmospheric pressure, is constant at 2.4 liters/min...

I'm having trouble with the following experiment. A balloon filled with sand attached to a string swings and hits a tissue box, which then slides to a stop. A spring scale is used to pull the box across the table and the amount of force required is given. The goal is to find the coefficient of...

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Any ideas on how to approach / set up the following problem? http://img124.imageshack.us/img124/9707/untitled8vv.jpg

Are the answers I got correct? http://img162.imageshack.us/img162/4007/untitled6kq1.png What I got: 1. a. http://img162.imageshack.us/img162/2193/1a3bp.png 1. b. http://img81.imageshack.us/img81/4995/1b9ov.png http://img84.imageshack.us/img84/4194/515oo.png...

Thank you. Unfortunately we have not discussed levers yet and are just in the middle stages of torque. Mechanical advantage is in the next chapter, I think. Yes, it is Giancoli (Sixth) page 221.