How can I improve my 5-K time? I'm about to be a softmore in high school and need to get faster?
Q. I need to improve my 5-K time for cross country. I now have a 3 mile time of 19:40. How much is the right amount to run over the summer? How can I shred my time?
Asked by Gil W - Sat Jun 21 13:56:08 2008 - - 6 Answers - 0 Comments

A. There is no right amount to how much you should run over the summer you should push yourself to the limits but don't go so hard that you injure yourself. You should be doing a mixed day schedule running 5-6 days a week. One day do a short fast run like a 2-3 mile run. The next day do a really long slow run of about 6-7 miles. Then the third day should be a mix of both at about 4-5 miles. You shouldn't run all 7 days because your body needs to rest. Also work on your ab strength because I have found that it is really helpful. All these distances can be adjusted to what you feel comfortable with but, good luck and keep running.
Answered by sccrguy132 - Sat Jun 21 15:10:06 2008

What is the minimum potential difference that must be applied to an X-ray tube to knock a K-shell electron com?
Q. What is the minimum potential difference that must be applied to an X-ray tube to knock a K-shell electron completely out of an atom with Z = 29? Use the Bohr model as needed.
Asked by Nessa - Sun Apr 12 05:38:27 2009 - - 1 Answers - 0 Comments

A. E=Z^2*E0*(1/nf -1/ni) here nf =infinity so 1/nf=0 , ni=1 the energy is positive E0 =13.6eVso 13.6*1.6*10^-19J=2.178*10 ^-18J as z=29Z^2=841 and E=2.178*10^-19*841=1.83*1 0^-15J
Answered by maussy - Thu Apr 16 04:06:07 2009

How much should I contribute to my 401(k) if I will be leaving the company in a year?
Q. I just recently became 20% vested in my company, and they opened up a profit sharing account for me with a 401(k) option. I will be leaving in the summer of 2008 because I will be going to Graduate school, but by then I will be 40% vested. I am wondering how much I should contribute, if any, to this plan even though I am leaving. I am also wondering if I should invest aggressively, moderately, or conservatively. I know that the yonger you are the more aggressive you should invest, but I am unsure now since I am leaving in a year.
Asked by Valerie Rose - Fri Mar 30 18:54:37 2007 - - 7 Answers - 0 Comments

A. You'll still have 100% of the money you put in, plus interest on that money (plus whatever the company vesting is). After you leave the company, you will have the option of rolling that money over into an IRA, or leaving it in place (although they may tell you otherwise, and discourage that). I'd save all I can, because of the tax deferral. If you are 25 and somehow manage to save $20,000 now -- with 'normal' returns for stock /mutual fund investments in the IRA, you'll be a millionare by the time you retire (or close to it). Remember this, though. If you roll over the money into an IRA later, DO NOT have the 401K people issue you a check otherwise there will be huge penalties from the IRS, even if you take that check directly to… [cont.]
Answered by tlbs101 - Fri Mar 30 19:03:17 2007