Cal
Most popular questions and responses by Cal
physics
A helium nucleus (charge = 2e, mass = 6.63 1027 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 
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 
Calculus  Compound Interest
Recently, a certain bank offered a 10year 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 
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 
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 
Alg2
A piece of wood discovered in an archaeological dig was found to have lost 62% of it's carbon14. Carbon14 has a halflife of 5630 years. Determine it's age.
asked on June 1, 2010 
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 
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 
cal
Find dy/dx by implicit differentiation given that tan(4x+y)=4x
asked on October 24, 2013 
algebra 2
PLEASE HELP wiTH ALL OF THEse. I DON'T KNOW WHERE TO STARTTHANKS! 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 
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 
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 
cal
Find dy/dx by implicit differentiation. x^3+8x+x^13yy^6=4
asked on October 24, 2013 
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 
physics
A proton is released at the origin in a constant electric field of 850 N/C acting in the positive xdirection. 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 
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 
PreCal
Find the standard form of the equation of the ellipse. (Remember center is midpoint between either foci or vertices) (1) 9x^2+4y^2+36x24y+36=0 (2) Vertices: (0,5)(0,5) Passes through the point (4,2) Centered at the origin
asked on April 19, 2009 
physics
What is the energy of a photon that has the same wavelength as a 12eV electron? (h = 6.63 × 1034 J×s)
asked on April 23, 2010 
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 
algebra 2
Just one more.. Thanks for the last one! 16^(d4) = 3^(3d) solve for d
asked on March 11, 2008 
math
7^t2 = 5^t
asked on March 11, 2008 
algebra 2
Could you help me on solving these please? thanks 135 = 5b^3 and 9.6=.3b^x
asked on February 25, 2008 
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 
cal
Use the Product Rule to differentiate f(u)= √u (5u^6)
asked on October 24, 2013 
Algebra
If g(x)=3x5, then g inverse(x)=
asked on May 25, 2011 
physics
After a parallelplate 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 
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 
cal
Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x9)^2 when i workout this problem I get this: by quotient rule: dy/dx = ( (x9)^2 (6)  6x(2)(x9))/(x9)^4 = 0 at a horizontal tangent 6(x9)^2 
asked on October 25, 2013 
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 
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 
4th grade
what is the rule for ___,68,___,94,___,120
asked on September 25, 2009 
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 
chem
What is the sum of the coefficients (including “1”) of the following reaction? Sodium sulfate + calciumhydroxide> ???
asked on February 29, 2008 
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 
Mulitvariable Calculus
How to proof tangential and normal components of a vector Thank you
asked on December 8, 2015 
cal
Find the second derivative of the function. f(x)= (3x^3+7)^7
asked on October 24, 2013 
cal
Find the derivative of the function. f(x)= x^8√53x
asked on October 24, 2013 
cal
Determine all values of x, (if any), at which the graph of the function has a horizontal tangent. y(x) = 6x/(x9)^2
asked on October 23, 2013 
cal
Use the Quotient Rule to differentiate the function. f(x)= 8x/x^5+3
asked on October 22, 2013 
Math
Can I simplify (12960  0.1x^2) / 0.2x^2 any further? How?
asked on October 20, 2013 
math
Solve n + 1 = 4
asked on August 2, 2012 
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 
math
subtract 31 m31=r
asked on October 12, 2011 
algebra
Andrew factored the expression 28x©ø6x©÷10x as 2x(14x©ø3x©÷5x) . But when Melissa applied the distributive law and multiplied out 2x(14x©ø3x©÷5x), she got 28x©ù6x©ø10x©÷; thus, Andrew¡¯s solution does not appear to check. Why is
asked on June 12, 2011 
algebra
The area of a rectangular athletic field is represented by the expression 16y²49z² 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 
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 
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

English Help ASAP
It's funny
posted on November 30, 2017 
Math
Plz don't off of steves answers most of them are wrong ;;
posted on November 30, 2017 
Art
It's the same person saying they have a 3/10 btw I got a 100%
posted on November 6, 2017 
math
21
posted on November 21, 2016 
Mulitvariable Calculus
Couldn't find any proofs for these Maybe a link would be great] Thanks
posted on December 8, 2015 
math
what are the first three terms of the sequence a1=2 and an=3(an1)2
posted on December 7, 2015 
physics
0 m/s ^2
posted on October 2, 2015 
Math
Yes.
posted on September 7, 2014 
statistics
85%
posted on March 16, 2014 
cal
from the ans choices i choose: dy/dx=  4x^2/x^2+1 is that right
posted on October 25, 2013 
cal
dy/dx = 3x^2+8+13x^12y / 6y^5x^13
posted on October 24, 2013 
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 (1460x^3)
posted on October 24, 2013 
cal
thanks jai
posted on October 24, 2013 
cal
am lost
posted on October 24, 2013 
cal
but the ans is f(x)= x^7(8051x)/2√53x
posted on October 24, 2013 
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 
cal
I got it. Never mind.
posted on October 22, 2013 
Math
Thank you! How would I solve 1 = (12960  0.1x^2) / 0.2x^2
posted on October 20, 2013 
math
1) a 2) b 3) d 4) a 5) d
posted on October 7, 2008 
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 
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 
math
yes
posted on March 11, 2008 
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