# Posts by Dirk

Total # Posts: 19

Physics
I think I might be on the right track, if someone could let me know if this is correct I would greatly appreciate it. A 51 kg diver is spinning forward in a tuck position at 1.9 rev/s, as shown in Fig. 13-38a. In this position, the diver's rotational inertia is 3.3 kg&...

Biochemistry
you know the pH of HNO3 to be 3.4 use pH=-log [] 10^-3.4= ?

biochemistry
the equation will look like this: pH=7.20+log 0.4/0.2 = 7.50 Yes?

biochemistry
Sorry the final pH of the mixture is 7.50, is that correct DrBob222?

biochemistry
pH=7.20+log 0.2M/ 0.4M pH=7.20+(-0.30) pH=6.69 I'm heading in the right direction?

biochemistry
pH=7.20+log0.1M/0.1M pH=7.20

biochemistry
pH= pKa + log 0.1M/0.1M what's the pKa value?

biochemistry
what's the pKa?

biochemistry
if 4 volumes of 0.1M monobasic potassium phosphate, KH2PO4, are mixed with 2 volume of 0.1 M dibasic sodium phosphate, Na2HPO4, what will be the pH of the mixture? What if 4 volumes of 0.1 M KH2PO4 are mixed with 8 volumes of 0.1 M ethanolamine base(pka=9.44) what will be pH ...

chemistry
CO (g) + Cl2 (g) ↔ COCl2 (g In one experiment, 0.93 bar of CO was combined with 1.01 bars of Cl¬2 in a reaction vessel at 700K. After the system reached equilibrium, the total pressure was 1.24 bars. Calculate Kp0 for the system.

math
x = 1 1/3

Trigonometry
I need to prove that the following is true. Thanks. csc^2(A/2)=2secA/secA-1 Right Side=(2/cosA)/(1/cosA - 1) = (2/cosA)/[(1-cosA)/cosA] =2/cosA x (cosA)/(1-cosA) =2/(1-cosA) now recall cos 2X = cos^2 X - sin^2 X and we could say cos A = cos^2 A/2 - sin^2 A/2 and of course sin^...

Chemistry
What is the common characteristic of the electron configurations of the elements Ne and Ar? Both have eight electrons in the outside shell.

english
I have a question about The Adventure of Huckleberry Finn. Why are Huck and his father living separately? http://en.wikipedia.org/wiki/Adventures_of_Huckleberry_Finn

what are three advantage of advertising? I can't think of anything. Suppose you owned a new company with a superior product no one ever heard of your product and you needed to help customers learn about its advantages. Or suppose you had to get rid of a lot of unsold goods...

what is the example of institutional advertising? I have tried to find it, but i couldn't. someone please help me. Here's the definition: (Broken Link Removed) A good example is the ubiquitous McDonald's arches. Even very young children associate these arches with ...