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?

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

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

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

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.

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.

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

8. chemistry

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

9. cal

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

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

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?

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.

13. cal

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

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,

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.

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)

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

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)

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

20. algebra 2

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

7^t-2 = 5^t

22. algebra 2

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

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

24. cal

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

25. Algebra

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

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?

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

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 -

29. cal

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

30. english

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

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

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 .

33. chem

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

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

35. Mulitvariable Calculus

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

36. cal

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

37. cal

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

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

39. cal

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

40. Math

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

41. math

Solve n + 1 = -4

42. math

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

43. math

subtract 31 m-31=r

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

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

47. Social studies

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

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