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  1. (a) For t=20, R=10e^(-20/40) = 10e^(-0.5) = 10/sqrt(e) = 6. (b) For R = 5, that is 5=10e^(-t/40), 0.5 = e^(-t/40) ln(0.5) = -t/40 , t= -40ln(0.5) = 27.8 = 28 sec. 2008-07-02 20:28:53 補充: To 002, my favorite time is 7am, not 23pm.

    分類:科學及數學 > 數學 2008年07月03日

  2. 2 Set 200/q = 30+20q 20q^2+30q-200=0 2q^2+3q-20=0 (2q-5)(q+4)=0 q=2.5 or -4 p=200/2.5=80 3 (a) the response magnitude after 20 seconds =10e^(−20/40) =6 (the nearest integer) (b) Set 10e^(−t/40)=5 e^(−t/40)=0.5 -t/40=ln(0.5) t=58 (the nearest second)

    分類:科學及數學 > 數學 2008年07月07日

  3. ...the sales for the information, they will introduce u to find the suitable one. 4. cough ........not a good sign, u should bring her to c the vet. 5. wear 冷衫 when the temp. drops under 12C, coz it's elastic which fits cats. If...

    分類:寵物 > 2006年12月21日

  4. ... eyes in health stimulate, have a headache, cough , throat pain, dizzy and sick; The adult asthma patient person's lung function obviously drops ; Send asthma can cause by second hand smoke of house...

  5. ...respiratory tract fluid which presumably is easier to cough up. It is the active ingredient in many ...amp;#39;s salmiakki and the Netherlands' zoute drop and the Danish Dracula Piller ...

    分類:科學及數學 > 化學 2007年09月30日

  6. ...confuse connect consider consist contain continue copy correct cough count cover crack crash crawl cross crush cry cure curl...dislike divide double doubt drag drain dream dress drip drop drown drum dry dust earn educate embarrass employ...

    分類:社會及文化 > 語言 2009年09月11日

  7. ...vine 2) to drink the rose flower-scented green tea drop out point red wine 3) to drink the sweet-scented ...student drank many turned impotent, the easy allergy, the cough or produced the leucorrhea oh.

    分類:社會及文化 > 語言 2007年04月14日

  8. ...after quitting, carbon monoxide levels in blood drop to normal Quit smoking after 48 ... to nine months after quitting, coughing , shortness of breath situation has improved considerably...

    分類:教育及參考書 > 教學 2009年12月04日

  9. ...berylium used in spring, relay, connection, computer motherboard cause shortness of breath, coughing , chest pain,rapid heart rate

    分類:科學及數學 > 化學 2008年10月25日

  10. ... a pool underneath his head. McInturf coughed , once, twice; a hideous, gurgling, strangling... of them staggered and almost dropped the body. They hurriedly laid McInturf...

    分類:社會及文化 > 語言 2007年03月05日