Cal

Most popular questions and responses by Cal
  1. physics

    A helium nucleus (charge = 2e, mass = 6.63 10-27 kg) traveling at a speed of 6.20 105 m/s enters an electric field, traveling from point circle a, at a potential of 1.50 103 V, to point circle b, at 4.00 103 V. What is its speed at point circle b?

    asked on January 29, 2010
  2. physics

    If three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is true? 1 The equivalent capacitance is greater than any of the individual capacitances. The capacitor with the smallest

    asked on January 29, 2010
  3. Calculus - Compound Interest

    Recently, a certain bank offered a 10-year CD that earns 8.93% compounded continuously. a) If $20,000 is invested in this CD, how much will it be worth in 10 years? Ans: I used the formula A = Pe^(rt) to get the answer $48,848.92 b)How long will it take

    asked on November 3, 2013
  4. physics

    A battery is attached across several different capacitors connected in series. Which of the following statements are true? 1 The capacitor with the largest capacitance carries the largest charge. All the capacitors have the same charge, and the equivalent

    asked on January 29, 2010
  5. Math - Limits/Derivatives

    The demand x is the number of items that can be sold at a price of $p. For x = p^3 - 4p + 400, find the rate of change of p with respect to x by differentiating implicitly.

    asked on October 21, 2013
  6. Alg2

    A piece of wood discovered in an archaeological dig was found to have lost 62% of it's carbon-14. Carbon-14 has a half-life of 5630 years. Determine it's age.

    asked on June 1, 2010
  7. CHEMISTRY!

    Carbon disulfide is prepared by heating sulfur and charcoal. The chemical equation for this is S2 (g) + C (s) CS2 (g) Kc = 9.40 at 900 K How many grams of CS2 (g) can be prepared by heating 11.7 moles of S2 (g) with excess carbon in a 5.95 L reaction

    asked on October 14, 2015
  8. chemistry

    How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)

    asked on October 22, 2014
  9. cal

    Find dy/dx by implicit differentiation given that tan(4x+y)=4x

    asked on October 24, 2013
  10. algebra 2

    PLEASE HELP wiTH ALL OF THEse. I DON'T KNOW WHERE TO START---THANKS! 1. At 2pm the number of bacteria in a colony was 100, by 4pm it was 4000. Write an exponential function to model the population y of bacteria x hours after 2pm. 2.Using the information in

    asked on February 24, 2008
  11. physics

    The electric potential at x = 3.0 m is 120 V, and the electric potential at x = 5.0 m is 190 V. What is the electric field in this region, assuming it's constant?

    asked on January 29, 2010
  12. math

    I am also having trouble with this one, thanks! If y varies jointly as x and the cube root of z, and y=120 when x=3 and z=8, find y when x=4 and z=27.

    asked on September 30, 2008
  13. cal

    Find dy/dx by implicit differentiation. x^3+8x+x^13y-y^6=4

    asked on October 24, 2013
  14. math

    I HAVE THESE ANSWERS FOR THE PROBLEMS. COULD YOU DOUBLE CHECK PLEASE, THIS IS A PRACTICE QUIZ WHICH ISN'T A GRADE IT JUST HELPS ME GET READY FOR THE TEST. 1) a 2) b 3) d 4) a 5) d 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i,

    asked on October 7, 2008
  15. physics

    A proton is released at the origin in a constant electric field of 850 N/C acting in the positive x-direction. Find the change in the electric potential energy associated with the proton after it travels to x = 2.5 m.

    asked on January 29, 2010
  16. alg 2

    write an exponential function whose graph passes throught the given points... (0,3)and (1,15)...(0,-5)and(-3,-135)...(0,-0.3)and(5,-9.6)

    asked on February 14, 2008
  17. Pre-Cal

    Find the standard form of the equation of the ellipse. (Remember center is midpoint between either foci or vertices) (1) 9x^2+4y^2+36x-24y+36=0 (2) Vertices: (0,5)(0,-5) Passes through the point (4,2) Centered at the origin

    asked on April 19, 2009
  18. physics

    What is the energy of a photon that has the same wavelength as a 12-eV electron? (h = 6.63 × 10-34 J×s)

    asked on April 23, 2010
  19. math

    Could you please solve so I can double check my answers for the practice quiz? Thank You!! 1. Solve x^3 + 6x^2 + 13x + 10 = 0. a) –2 + 2i, –2 –2i, –2 b) 2 + i, 2 – i, –2 c) –2 + i, –2 – i, –2 d) 2 + 2i, 2 – 2i, –2 2. Find the

    asked on October 7, 2008
  20. algebra 2

    Just one more.. Thanks for the last one! 16^(d-4) = 3^(3-d) solve for d

    asked on March 11, 2008
  21. math

    7^t-2 = 5^t

    asked on March 11, 2008
  22. algebra 2

    Could you help me on solving these please? thanks -135 = -5b^-3 and -9.6=-.3b^x

    asked on February 25, 2008
  23. chem intro

    The rate of the following reaction is 0.90 M/s. What is the relative rate of change of each species in the reaction below? A + 3B --> 2C

    asked on September 10, 2015
  24. cal

    Use the Product Rule to differentiate f(u)= √u (5-u^6)

    asked on October 24, 2013
  25. Algebra

    If g(x)=3x-5, then g inverse(x)=

    asked on May 25, 2011
  26. physics

    After a parallel-plate capacitor is charged by a battery, it is disconnected from the battery and its plate separation is increased. Which of the following statements is correct?

    asked on January 29, 2010
  27. Critical Thinking

    Identify any examples of bias presented by the author. If none exist, explain how you determined this. Until his death in 2003, Paul Simon was a professor at Southern Illinois University, where he taught classes in political science, history, and

    asked on May 3, 2008
  28. cal

    Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x-9)^2 when i workout this problem I get this: by quotient rule: dy/dx = ( (x-9)^2 (6) - 6x(2)(x-9))/(x-9)^4 = 0 at a horizontal tangent 6(x-9)^2 -

    asked on October 25, 2013
  29. cal

    Find the slope of the graph of the function at x = 5. f(x)= -2x^2+6/x^2

    asked on October 22, 2013
  30. english

    Im in third grade and i don't understand colons.i have to proofread a paragraph and combine them using colons.

    asked on December 8, 2010
  31. 4th grade

    what is the rule for ___,68,___,94,___,120

    asked on September 25, 2009
  32. math

    I am having trouble with this problem, thanks! If y varies jointly as x and the cube of z, and y=378 when x=4 and z=3, find y when x=9 and z=2 .

    asked on September 30, 2008
  33. chem

    What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calciumhydroxide--> ???

    asked on February 29, 2008
  34. chemistry

    What is the sum of the coefficients (including “1”) of the balanced equation? __CaCO3 + __NaF __ CaF2 + __Na2CO3 4 5 6 7 8 If you start with 20.0 grams CaCO3, how many moles of CaCO3 do you have? 20.0 2.00 .200 .0200 .0386 If you start with .500 moles

    asked on February 12, 2008
  35. Mulitvariable Calculus

    How to proof tangential and normal components of a vector Thank you

    asked on December 8, 2015
  36. cal

    Find the second derivative of the function. f(x)= (3x^3+7)^7

    asked on October 24, 2013
  37. cal

    Find the derivative of the function. f(x)= x^8√5-3x

    asked on October 24, 2013
  38. cal

    Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x-9)^2

    asked on October 23, 2013
  39. cal

    Use the Quotient Rule to differentiate the function. f(x)= 8x/x^5+3

    asked on October 22, 2013
  40. Math

    Can I simplify (12960 - 0.1x^2) / 0.2x^2 any further? How?

    asked on October 20, 2013
  41. math

    Solve n + 1 = -4

    asked on August 2, 2012
  42. math

    what if i have 6 1/2 ft of lumber and i only need 3/5 how much is itZ?

    asked on January 18, 2012
  43. math

    subtract 31 m-31=r

    asked on October 12, 2011
  44. algebra

    Andrew factored the expression 28x©ø-6x©÷-10x as 2x(14x©ø-3x©÷-5x) . But when Melissa applied the distributive law and multiplied out 2x(14x©ø-3x©÷-5x), she got 28x©ù-6x©ø-10x©÷; thus, Andrew¡¯s solution does not appear to check. Why is

    asked on June 12, 2011
  45. algebra

    The area of a rectangular athletic field is represented by the expression 16y²-49z² square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct

    asked on June 12, 2011
  46. Critical Thinking

    Capital Punishment Does Not Make Nation Safer Identify and name any rhetorical devices used by the author. If none exist, explain how you determined this. Until his death in 2003, Paul Simon was a professor at Southern Illinois University, where he taught

    asked on May 2, 2008
  47. Social studies

    Was John Cabot Married? He was married in 1492, and had three sons: http://en.wikipedia.org/wiki/John_Cabot

    asked on February 15, 2007
  1. English Help ASAP

    It's funny

    posted on November 30, 2017
  2. Math

    Plz don't off of steves answers most of them are wrong ;-;

    posted on November 30, 2017
  3. Art

    It's the same person saying they have a 3/10 btw I got a 100%

    posted on November 6, 2017
  4. math

    21

    posted on November 21, 2016
  5. Mulitvariable Calculus

    Couldn't find any proofs for these Maybe a link would be great] Thanks

    posted on December 8, 2015
  6. math

    what are the first three terms of the sequence a1=2 and an=3(an-1)2

    posted on December 7, 2015
  7. physics

    0 m/s ^2

    posted on October 2, 2015
  8. Math

    Yes.

    posted on September 7, 2014
  9. statistics

    85%

    posted on March 16, 2014
  10. cal

    from the ans choices i choose: dy/dx= - 4x^2/x^2+1 is that right

    posted on October 25, 2013
  11. cal

    dy/dx = 3x^2+8+13x^12y / 6y^5-x^13

    posted on October 24, 2013
  12. cal

    I have these ans choices: A. f= 63x(7+3x^3)^5 (14+60x^3) B. f= 63x(7+3x^3)^5 (14+63x^3) C. f= 63x(7+3x)^5 (14+63x^3) D. f= 63x(7+3x^3)^5 (14-60x^3)

    posted on October 24, 2013
  13. cal

    thanks jai

    posted on October 24, 2013
  14. cal

    am lost

    posted on October 24, 2013
  15. cal

    but the ans is f(x)= x^7(80-51x)/2√5-3x

    posted on October 24, 2013
  16. cal

    I have these answer choices: x=9 and x=6 x=-9 x=-9 and x=6 x= 6 The graph has no horizontal tangents.

    posted on October 23, 2013
  17. cal

    I got it. Never mind.

    posted on October 22, 2013
  18. Math

    Thank you! How would I solve 1 = (12960 - 0.1x^2) / 0.2x^2

    posted on October 20, 2013
  19. math

    1) a 2) b 3) d 4) a 5) d

    posted on October 7, 2008
  20. math

    it is not a test, it is a practice quiz they helped us make in order to prepare for the test, I just want help double checking my answers

    posted on October 7, 2008
  21. Critical Thinking

    my answer is Since 1975, 35 retarded people have been executed; people whose IQ is below 70. Of the nations that have executed people for crimes committed below the age of 18 since 1990, they are these nations: Iran, Nigeria, Pakistan, Saudi Arabia, Yemen

    posted on May 3, 2008
  22. math

    yes

    posted on March 11, 2008
  23. chemistry

    I posted under my friends name accidentally.. but number 2 is .2 because I found molar mass. Number 3 4 and 5 is where I get lost

    posted on February 12, 2008