# Posts by Rossi

Total # Posts: 9

**TRIG**

what is another form of: sin (A+B) sin (A-B)/ cos^2 A cos^2 B a) cos^2 A - cos^2 B b) tan^2 A - tan^2 B c) tan^2 A - tan^2 B d) sin^2 A - sin^2 B please show the steps you take to get to the answer! thank you

*November 26, 2010*

**TRIG**

If cos theta= -sin theta, then sin^2 theta is? a) 1/4 b) 1/2 c) sqrt2/2 d) - sqrt 2/2 please show me how you got the answer! thank you!

*November 26, 2010*

**TRIG**

what is the exact value of sin^2 pi/6-2 sin pi/6 cos pi/6 +cos^2 (-pi/6)? a) 2- sqrt 3 b) 2- sqrt 3/ 2 c) 2+ sqrt 3/2 d) 2+ sqrt 3 I am not sure how to work this out and would appreciate you how to show me the process. Thank you in advanced!!!!!!!

*November 26, 2010*

**Physics**

He has to jump 9.81/2 = 4.905 meters Since we are told his maximum jump is only one meter then the claim is false. answer is 4.9 m

*October 11, 2010*

**Chem 1**

How do I determine which molecule of each pair has the largest dipole moment? case one: CO and NO case two: SF4 and CF4 I have to use their electronegativities, right? For linear molecules, such as CO and NO, yes, use electronegativity. For non-linear molecules, such as SF4 ...

*November 10, 2006*

**Comment**

I am a freshman in college and this is the first time I have received help over the internet. I have been using this site for a couple of days now and all I have to say is that this site is great! I would like to say thanks to all the "helpers"! We are here to help. ...

*October 25, 2006*

**Chem 1**

Why is this phrase, “Lewis Structure” a misnomer? I've googled it... and I can't seem to find an answer. Any suggestions as to where I can read some info on that? Lewis implies ionic bond, structure implies fixed covalent bonds. Screw you, that's simple

*October 25, 2006*

**Chem 1**

In the ground state of element 115, how many electrons have ml=1 as one of their quantum numbers? Can anyone provide an explanation? I am kind of stuck... and I don't think it is too hard, I just don't know where to start. Thanks ahead of time... Go to www.webelement....

*October 24, 2006*

**Chem 1**

It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. What is the maximum wavelength (in nm) of light capable of removing a single electron from an atom on the surface of rubidium metal? Ok, I know I have to find how many kJ ...

*October 21, 2006*

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