# karl

Popular questions and responses by karl
1. ## Chemistry

In a lab, we added NH3(aq) to CuSO4(aq), and the solution turned dark blue with a precipitate. The problem is that the products ( Cu(NH3)4 and SO4) should be soluble, no? The question is then, what is the percipitate? The ppt is Cu(OH)2. The dark blue

2. ## physics

A shuffleboard disk is accelerated to a speed of 5.6 m/s and released. If the coefficient of kinetic friction between the disk and the concrete court is 0.29, how far does the disk go before it comes to a stop? The courts are 15.7 m long.

3. ## Chemistry

Quick question, since FePO4 is insoluble, will that mean a precipitate will form? During the experiment I don't remember seeing a precipitate. Is that my error, or is the precipitate hard to see? Sure. Adding Na3PO4 will make a big difference. FePO4 is

4. ## physics

A box, open at the top, in form of a cube of edge length 40 cm, is constructed from a metal plate. Find the coordinates of the center of mass of the box with respect to x, y, and z coordinate system.

5. ## physics

Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,

6. ## geometry help

a trapezoid has base lengths of 4 and 19 feet, with an area of 115 square feet. what is the height of the trapezoid?

7. ## determining speed

car leaves a 20 ft. skid mark how fast was the car traviling

8. ## Social Studies

How were the carpetbaggers able to influence freed slaves in the south? A. They gave them land and helped them start farms. B. They took advantage of their inability to read and write. C. They promised them high-paying jobs in the newly elected government.

9. ## History

Which of the following tools of the Archaic culture was primarily used for hunting birds and smaller prey? A. atlatls B. game nets C. bird stones D. grinding stones

10. ## trigonometry

A barge is being towed south at the rate 2 km/hr. A man on the deck walks from west to east at the rate 4ft/s. Find the magnitude and direction of the man's actual velocity.

11. ## algrebra 2

how to find the xintercept and y intercept 5y=15x-90

12. ## Math

Gus has a checking account balance of \$75. His bank will fund the a debit card purchase that creates a negative balance up to a limit of \$200, but charges a \$35 fee per transaction for any purchase made in overdraft. Gus made a purchase of \$100 yesterday,

13. ## jkuat

find log30 if log2=0.301 and log3=o.477

14. ## maths

i am a mutiple of 5 ,but not a mulitple of 10.my units and hunderde are the same.the sum of my three digits is 11,what am i

15. ## psychology

Psychologists are interested in people's behavior and their mental processes. Psychologists believe that: behavior is impacted by environment, but not by a person's physical state. behavior is affected by a person's mental and physical state, but rarely by

16. ## physics

On the surface of the Moon, a ball is thrown horizontally, with a speed of 15 m/s, from the top of a 6 m tall hill. How far from the point on the ground directly below the launch point does the ball strike the ground? (On the Moon, the acceleration due to

17. ## trigonometry

A box of 200kN is placed on a smooth inclined plane 28° with the horizontal. To prevent the box from sliding down the plane, a rope is tied to it and fastened to a peg on the top of the incline as shown. Determine the pull on the string assuming that the

18. ## calculus

find 3 positive real numbers whose sum is 500 and whose product is as large as possible.

19. ## chemistry

Using the Le Chatelier's principle, predict the direction of the net reaction in each of the following equilibrium systems, as a result of increasing the pressure at constant temperature. a)N2(g) + O2(g) ==> 2NO(g) PCl3(g) + Cl2(g) COCl2(g)

20. ## Pre cal

A parallelogram has sides of lengths 7 and 4, and one angle is 55°. Find the lengths of the diagonals. (Round your answers to two decimal places. Enter your answers as a comma-separated list.)

21. ## Math

Sherry saved \$1800 she earned at her summer job. She invested part of her money in a Treasury Bill at 5% and the balance in a Money Market fund which guaranteed a return of 10%. If she earned \$165 on her investments in the first year, how much was invested

22. ## physics

A motorcycle and 66.0 kg rider accelerate at 2.0 m/s2 up a ramp inclined 5.0° above the horizontal. What are the magnitude of (a) the net force on the rider and (b) the force on the rider from the motorcycle?

23. ## math

my P.E. teacher asked the 100 seventh graders in my school if they could swim. Half of the boys and two thirds of the girls said yes. Seventeen boys said no. How many seventh graders know how to swim?

24. ## Math

. A school has conducted an exam for the 8th grade and published the results in the table. Find the measure of the central angle that would represent the percent of students who took German in the 8th grade.

25. ## Chemistry

The melting temperature of the fluorides of selected alkali metals and alkaline earths are listed below (see Table). If one considers the trend of the listed melting temperatures in terms of both the ionic character of the bonds and the ionic potentials of

26. ## gen 300

Identify a problem in your day-to-day life you would like to solve (e.g., time management). Using the information from your Week Three readings as a guide, prepare a 700 to 1,050-word paper in which you develop a research strategy to find a solution for

27. ## Algebra 2

M Varies jointly with A and T and inversley with H. Write and equation that represents the relationship.

28. ## psychology

Jeff says, "It seems like the more money people make, the more debt they assume," but a/an __________ study might make the case that a rise in income does not by itself cause an increase in debt. criterion validity case experimental correlational I chose

29. ## Science

In what group of the periodic table is the element with the following configuration [Ar] 4s2 3d10 4p3

30. ## math

Hello, i would like to know what is the complex conjugate of : (a*c*d)×( (-e*d+i)/(1-e*c*d^2) ) Thanks for your help.

31. ## programming

b. Write a well-commented C++ program that reads data from the input file employee.txt. Each input line consists of last name, first name, base salary, total sales, and number of years of service. Store the output in the file employees_payCheck.txt. Format

32. ## math

express 84 minutes as a fraction of 4 hours

33. ## Math

Hello, I'd like to know how in developing, factoring or simplifying, we can move from: A + ( (1 / ( (1 / ICD) + IED) ) to: ACD *( ( - ED + I ) / (1 - ECD^2 ) ) ACDE are strictly positive real constants. I is an imaginary number.

34. ## psychology

One advantage of using tests in research, rather than laboratory observation, is the usefulness of: the presence of the researchers, which increases the reliability of the results. describing behavior, rather than explaining it. tests in clarifying the

35. ## math

If a mouse fell to the bottom of a 8 foot deep well and he climbed 3 feet every day but fell 2 feet every night how many days would it be before he got out of the well?

36. ## math

Hello, i would like to know what is the complex number of : (a*c*d)×(-e*d+i)/(1-e*c*d^2) ACDE are strictly positive real constants. I is an imaginary number. Thanks you a lot for you help.

37. ## psycholgy

Prepare a 1,050 to 1,400-word paper in which you reflect on a challenging experience that you have encountered in either a professional or personal environment that involved significant “thinking through” or reasoning. Be sure to address the following

38. ## Stats

I there are 1000 numbers in a contest what is the probability you win if: - play 1 number for \$1.00 - play 2 numbers for \$1.00 - play 1 number for \$2.00

39. ## psychology

To gain acceptance, a hypothesis must be: suggested by a credible authority. kept secret until the research is completed. imaginative and appealing. backed by empirical evidence

40. ## psychology

It is the proper role of a psychological research scientist to: question data. make safe predictions. keep research methods accessible only to those involved in the research. avoid making predictions.

41. ## fractions

I cannot figure out how to turn fraction into decimals.Sample 8 over 25.Also turning decimals into fractions 0.65

42. ## Science

A ball thrown vertically upward has a speed of 5.0 m/s at a height of 3.0m. The mass of the ball is 1.2 kg. Find its mechanical energy

43. ## Physics

What is the magnitude of the electric field 0.3 m from a 10-4 C point charge?

44. ## Physics

A 100 m long wire with a cross-sectional area of 4 mm2 has a resistance of 6 ohms. What is the resistivity of the material of the wire in Ùm?

45. ## math

your class has 8 women and 19 men. write the number of women to men as a ratio and as a quoyient. whatpercent of the class are women? show your work.

46. ## social studies

To use dollar-cost averaging, an investor must invest: in securities with high average yields. in dollars rather than currencies from outside the U.S. or Canada. a variable amount of money at regular intervals. the same amount of money in stocks regularly.

47. ## A level Mathematics

Show that the tangents to the curve X=ln((y^2)-6y+11) ,at the points where X=ln6,meet at the point ((ln6)-(4/3),3)

48. ## psychology

reflect on a challenging experience that you have encountered in either a professional or personal environment that involved significant “thinking through” or reasoning.

49. ## PHYSIC

A block displacement causs of a force in a horizontal surface is 13m and the work done by the force on the block .6 joules .

50. ## math

Hello, I'd like to know how in developing, factoring or simplifying, we can move from: goo.gl/zZdzSs ACDE are strictly positive real constants. I is an imaginary number.

51. ## math

Hello, I'd like to know how in developing, factoring or simplifying, we can move from: A + ( (1 / ( (1 / ICD) + IED) ) to: ACD *( ( - ED + I ) / (1 - ECD^2 ) ) ACDE are strictly positive real constants. I is an imaginary number. Thanks a lot for your help.

52. ## math

ratio of 8/9,quotient of 8/19,percent of 8/19.

53. ## Math

The rounded numbers all range from the hundred thousands to the millions. Which place-value should be used as intervals for a scale for the graph?

54. ## algebraa

find the length of the third side of the triangle perimeter=12 3cm 4cm

55. ## maths

Show that the tangents to the curve X=ln((y^2)-6y+11) ,at the points where X=ln6,meet at the point ((ln6)-(4/3),3)

56. ## algebrra

perimeter: 56cm 7cm 24cm the lenght of the third side of the triangle is? idk

57. ## Algebra Math 116

How can you tell if a value is a solution to an inequality.

60. ## Algebra (logs)

Please help, I need help on these two problems. Solve the equation. log3(x − 16) = log3(9x) e^1 + ln(7) It appears on the homework that the ln(7) is written like this ^ln(7) but I am still stuck on it. Thanks!

61. ## algebraa

perimeter= 30 5cm 12cm the lenght of the third side of the triangle is?

1. ## Math

Oh thank you so much, I was confused about the fees

posted on February 10, 2020
2. ## Math

Is it -97

posted on February 10, 2020
3. ## math

Thx

posted on March 21, 2019
4. ## Science

If I look at the exact element it goes under group 5A. Then if I consider the valence electron it will be under group 3A. Im still confused.

posted on August 26, 2018
5. ## college physics

An aluminum cup contains 225 g of water

posted on November 18, 2017
6. ## Chemistry

1.44*10^-66

posted on November 10, 2017
7. ## chemistry

u suc at life

posted on June 11, 2017
8. ## algebra 1

75

posted on August 25, 2016
9. ## history

Actually the correct answers are D, B, A

posted on May 9, 2016
10. ## history

I believe the correct answer is C.

posted on May 9, 2016
11. ## history

8:D 9:A

posted on May 9, 2016
12. ## try,check,and revise

I agree with Steve.

posted on April 12, 2016
13. ## Math

Just do 5 divided by 8 and then do 24 divided by that outcome.

posted on April 12, 2016

was the answer to number 3 D(santee cooper project)?

posted on April 12, 2016
15. ## Social Studies

posted on April 12, 2016
16. ## Stats

I thought I was looking for a %

posted on February 25, 2016
17. ## chemistry

438mL

posted on October 15, 2015
18. ## chemistry

Well, the pressure here is not constant, but the temperature is. Reversible implies that there are infinitesimal changes in certain parameters. For isothermal, reversible systems delta H=0 delta U=0 q=-w and w=-nRTln(Vf/Vi) You can find your Vf by using

posted on September 28, 2015
19. ## Pyhsics

Coefficient of kinetic friction= tan0- Accelaration/gcos0

posted on February 17, 2015
20. ## Pyhsics

0.176

posted on February 17, 2015
21. ## At what temperature do hydrogen molecules have the

At what temperature do hydrogen molecules have the same rms speed as nitrogen molecules at 90 degrees Celsius?

posted on November 10, 2013
22. ## math

Thanks a lot for your help . I'll visit it

posted on November 2, 2013
23. ## Math

posted on November 2, 2013
24. ## chemistry

there should be an E(V) too. let suppose your E(V)=.128.. your calculation should somewhat look like this if I'm not wrong, Ecell=E^o cell - (RT/nF)lnQ .125=0-(.0592/2)lnQ e^(-.128/.0296)=[I]/.1M [I]=.001324 [Pb]= [I]x(1/2)=.000662 ksp=[Pb][I^2]=1.16E-09

posted on October 25, 2013
25. ## chemistry

If lithium is a BCC crystal. planar density is atoms per area the 001 plane look like this o--o | | o--o the sides are equal to lattice constant a and the atoms in this area = 4(1/4) = 1

posted on April 26, 2013
26. ## chemistry

Lithium is a BCC Crystal a = 3.5092 * 10^-8 Planar Density (001) (top plane) = 1/a^2 = 8.12 * 10^14

posted on April 26, 2013
27. ## English-Literature

house

posted on July 10, 2012
28. ## Math

okay thanks bobpursley

posted on January 12, 2011
29. ## psychology

D!! Thank you

posted on October 30, 2010
30. ## psychology

based on the websit you provided I will assume it is B.

posted on October 30, 2010
31. ## psychology

Would it be D?

posted on October 30, 2010
32. ## psychology

I chose D. Am I correct?

posted on October 30, 2010
33. ## psychology

posted on October 30, 2010
34. ## psychology

posted on October 28, 2010
35. ## social studies

posted on October 28, 2010
36. ## physics

a)2.910 b)11.089

posted on October 25, 2010
37. ## physics

hows that it doesnt work whats the full equation?

posted on October 9, 2010
38. ## Chem

u need to get the M as M= 15*M(C) + 22 * M(H) + 2 * M(O) + 1 M(Cl) + 1 M(N) then u use the formula n=m/M and u replace youll have m= n*M

posted on October 9, 2010
39. ## algebraa

thats what i gett

posted on August 31, 2010