# Questions Asked onJuly 18, 2010

1. ## College Physics 121

A spring with a spring constant k = 50N/m has an unstretched length of 20cm. Find the work required to stretch the spring to a length of 30 cm. W = J ?? any help guys?

2. ## Chemistry

Estimate the value of the equilibrium constant at 550 K for each of the following reactions. 1) 2CO(g) + O2(g) 2CO2(g) 2) 2H2S(g) 2H2(g) + S2(g) Thanks in advance!

3. ## algebra

maria can shovel snow from her driveway in 35 min. tom can do the same job in 45 min. how long would it take maria and tom to shovel the driveway if they worked together?

4. ## physics

A horse pulls a cart with a force of 40lb at an angle of 30 degrees above the horizontal and moves along at a speed of 6mi/hr. A) how much work does the force do in 10 min? B) What is the average power (in horsepower) of the force?

5. ## College Physics.

A pendulum has a period of 1.8 s. a) Its mass is doubled. What is its period now? b) Its length is doubled. What is its period now? The original pendulum is taken to a planet where g = 16 m/s2. c) What is its period on that planet?

6. ## math

how many diferrent 9-letter words (real or imaginary) can be formed from the letters in the word ECONOMICS? the ans. must be 90,720

7. ## chemistry

State three examples each of acids, bases, and salts commonly used in therapeutic processes

8. ## chemistry

Determine the overall orders of the reactions to which the following rate laws apply: a. rate = k[NO2]^2 b. rate = k c. rate = k[H2][Br2]^1/2 d. rate = k[NO]^2[O2] I think the answers are: a. Second Order b. Zero Order c. First Order for H2 and One-half

9. ## math 157

A receipt contains 3 ingredients, In how many different orders can all the ingredients be added.

10. ## chemistry

The ionization constant Ka of an indicator HIn is 1.0x10^-6. The color of the nonionized form is red and that of the ionized form is yellow. What is the color of this indicator in a solution whose pH is 4.00? Thanks!

11. ## chemistry

balance the following equation, and identify the type of reaction. ZnSO4+SrCl2-> i think it's a double replacement reaction. But could someone please help me balance it. I'm not sure how.

12. ## Nutrition, Health, and Safety for Young Children

What is a good Thesis Statement for my topice. My topic is Nutrition, Health, and Safety Training for Early Childhood Educators.

13. ## Nutrition, Health, and Safety for Young Children

What is a good thesis statement which discuss the overall wellness of young children and the role an Early Childhood Education Setting can play in a young child's health and well-being?

14. ## Chemistry

Which of the four factors affecting reaction rate is most important in each example below? Choose from among concentration, temperature, surface area, and catalyst. A? Extra dish soap is added to help cut the grease when washing a frying pan. =

15. ## Physics

You decide to take a nice hot bath but discover that your thoughtless roommate has used up most of the hot water. You fill up the tub with 270 kg of 30.0°C water and attempt to warm it further by pouring in 5.00 kg of boiling water from the stove. (a)

16. ## EARTH SCIENCE

How are carbon dioxide and other trace gases thought to be potentially related to global warming? Are the levels of these gases in our atmosphere increasing or decreasing? Why? Finally, what are some of the observed climatic trends and possible

17. ## od

Temple Corp. is considering a new project whose data are shown below. The equipment that would be used has a 3-year tax life, would be depreciated by the straight-line method over its 3-year life, and would have a zero salvage value. No new working capital

18. ## EARTH SCIENCE

Some factors that might influence solar radiation on the Martian surface

19. ## physics

A 2.0kg bag is held by a string to the ceiling as shown in the diagram below. A 10-g bullet travelling at 200m/s strikes the stationary bag. The height of the bad after the collision is 10cm. Assuming there is no friction, determine the speed, in metres

20. ## childcare

how will a authoritarian and a authoritative solve a problem in they own way?

21. ## math 157

question #1 provide an approiate response. Write the next equation in the pattern 1+1=2 1+1+2=4 1+1+2+3=7 1+1+2+3+5=12

22. ## chemistry

The initial state of a reaction is A2 +B2 –> 2AB. In the initial state of the reaction there are 6 A2’s present and 6 B2’s present. Suppose the reaction is carried out at two temperatures.Which of these situations represents the result at the higher

23. ## algebra

12-6x=3[2-4(x-6)] I KNOW THE ANSWER IS 11 BUT EVERYTIME I DO THE STEPS IT COMES OUT WRONG. COULD YOU SHOW ME DETAILED STEPS? Thankyou.

24. ## calculus

A ball has bounce coefficient 0 < r < 1 if when it is dropped from height h, it bounces back to a height of rh. Suppose that such a ball is dropped from an initial height a and subsequently bounces infinitely may times. Find the total up-and-down distance

25. ## chem 11

write the balanced equation for the electrolysis of water. What type of reaction is this?

26. ## Chem

How are these values used to determine percent? actual yield is quantity of a product found to be formed in a chemical reaction and theoretical yield is the amount of product predicted theoretical yield is larger because in experiments reactions might not

27. ## math

If ann is 22 years old and terry is 10 years old, how many years ago was ann four times as old as terry

29. ## math

Find the z-score for the given raw score, mean, and standard deviation. Assume a normal probability distribution for raw score = Raw score = 66, µ =60 , and ó =6

30. ## 11th matriculation physics kinematics

an aeroplane takes of at an angle of 45deg to the horizontal. If the vertical component of its velocity is 300kmph, Calculate its actual velocity. what is the horizontal component of it velocity?

31. ## Algebra

The cost, in millions of dollars, to remove x % of pollution in a lake modeled by C=4,000/200-2x What is the cost to remove 65% of the pollutant? Show all your work. What is the cost to remove 95% of the pollutant? Show all your work. What is the cost to

32. ## Math (Algebra)

Could I have someone check my work please? If I did something wrong please explain to me where I went wrong. Thank You. Example of the product rule to solve would be, (5^3)(6^3) Example of the quotient rule to solve would be, (4^2) / (8^2) Example of the

33. ## umuc

sample of 80 people randomly asked in casino shows that average lost per person is \$160 with a sample standard deviation s=\$40. Based on this data create a 95% confidence interval for population mean.

34. ## us history

What was John F. Kennedy's focus/intentions for writing the book Profile in Courage?

35. ## Math11U

A company has been selling 1200 computer games per week at \$18 each. Data indicates that for each \$1 price increase, there will be a loss of 40 sales per week. It costs \$10 to produce each game. a) State the revenue function b) State the cost function c)

in the heat of soultion lab what would happen to the delta T if the soultion CaCl2 was not stireed with the water?

37. ## science 225

How much, how long, and how often are humans exposed to Malathion?

38. ## math

The period T (time in seconds for one complete cycle) of a simple pendulum is related to the length L (in feet) of the pendulum by the formula 8T^2=Pi^2L. If a child is on a swing with a 10-foot chain, then how long does it take to complete one cycle of

39. ## math

Name: Barbara Dillon Date: July 18 2010 1. Divide 90÷18 =5 Answer is 5 2. Place the following set of numbers in ascending order. 22, –7, 8, –4, 12, –1, 14 Ascending order : -7, -4, -1, 8, 14, 22 3. Add 4. Subtract 5. Divide -18÷ -9 = 2 6. Evaluate

40. ## Math 11u

A town has a population of 8400 in 1990. Fifteen years later, it's population grew to 12,500. Determine the average annual growth rate of this town's population. Round to the nearest tenth of a percent. (the answer in the book is approx.2.7) thank you for

41. ## Math

Find the critical numbers of the function s(t)=3t^4+4t^3-6^2

42. ## math

Jen, I will attempt to write the others out. #3)ADD: -57 + (-22) I got -79 #4)Subtract -2.3-(-8.8) I got -6.5 #7)perform indicated operation: -21 - (-9) I tried to underline ----------- -21 - (-21) I got -12 over o or undfined #8)Multiply:(4){-3/2} This

43. ## math

while riding a bike at a rate of 14 mph, Steven takes 1.2 hours to ride the entire length of a trail. how many hours would it take him to complete the same ride if he rode at 8 mph? how do you do this problem?

44. ## INB 205

Wal-Mart Taking on the World Minicase Thank you Ms Sue. Now I need to find: Some statistics in regard to GNP and future growth potential for expanding Wal-Mart into India. What are the Government and Public Attitudes about American Products? Promotional

45. ## Math

Find absoulute maximum and absolute minimum of the function f(x)=2cost+sin2t

46. ## chemistry

Balance the equation.. __Cu+__HNO3 -> __Cu(HNO3)2+__NO+__H2O

47. ## chem11

write out the balanced reaction for magnesium and copper (I) chloride solution. Mg2(s) + 4CuCl2(aq) -> 2MgCl2(aq) + 4Cu(s) is this right? i'm not sure exactly how to do this. Please help

48. ## math

solve for unknown: log9 r=3/2 logG 2=1/3 Can you show me the steps how to solve this problems.Thank yo very much for your time

49. ## physics

A suitcase (mass m = 15 kg) is resting on the floor of an elevator. The part of the suitcase in contact with the floor measures 0.50 m × 0.15 m. The elevator is moving upward with an acceleration of magnitude 1.00 m/s2. What pressure (in excess of

50. ## Algebra

graph the equation x-3=y (where do I plot the points?) find the intercepts and then graph: 5x+4y=20 find the intercepts and then graph: 1.4x-1.3y=3.64 graph the equation using slope and y-intercept: y=10/7x +4 graph using slope and y-intercept: x+2y=8

51. ## algebra

Simply by removing factors of 1 q^2-25/(q+5)^2

52. ## chemistry

in my text book it says that if the calculated value is less than or equal to 0.1 then the color of the conjugate base (In- in this case) predominates. does this mean that the solution will be yellow then?

53. ## algebra

Simply by removing factor 1 p^2-36/p^2-12p+36

54. ## Nutrition, Health, and Safety for Young Children

What is a good purpose statement for discussing "why health, safety and nutrition strategies are important to identify and practice in an Early Childhood Education Program?

55. ## stats math

An appliance store sells washing machines and dryers among other things. The average sale on washers and dryers is \$530 with a standard deviation of \$100. Suppose that sales figures on washers and dryers are normally distributed. If a sale is randomly

56. ## stats math

Suppose x is normally distributed with a mean of 130 and a standard deviation of 25. Twenty-six percent of the values are less than what value? 123.5 114 136 146

2+3(8-4)=

58. ## science

2. You are on the London Eye observational wheel, which is 135 m tall and rotates once every half-hour. What is your velocity (speed and direction)?

59. ## HELP ENGLISH LIT.

what type of context clue is being used when a author helps explain a difficult word by describing the setting or scene? Contrast example comparrison expirence

60. ## algebra

To determine the number of deer in a game preserve, a conservationist catches 523 deer tages them and let's them loose. Later 468 deer are caught, 234 of them are tagged. How many deer are in the preserve?

61. ## ENGLISH HELP!!!

when did Romanticism became popular?? - before the Enlightenment - during the Enlightenment - at the end of the Enlightenment - a century after the end of the Enlightenment

62. ## Chemistry

You have 2 chemicals A (solid), but you do not know the exact composition od either one of them. You do know that all together, there is SOME combination of sodium, barium, chloride and phosphate (PO4^-3) present. You disolve both chemicals in water. then

63. ## Chemistry

The following reaction was monitored as a function of time: AB--->A+B A plot of 1/[AB] versus time yields a straight line with slope 5.2×10−2 . If the initial concentration of is 0.240M , and the reaction mixture initially contains no products, what are

64. ## chemistry

you are right....I wrote it wrong. Does this mean that the solution will be more toward the redish side?

65. ## Microeconomics

What is the supply, demand, and the price discrimination for John Q the movie? I have to write an enconomic principles paper about John Q, I have a full page typed already but im having trouble with the with the question above so can some one help me

66. ## Math11U

Determine the maximum or minimum value. Use at least two different methods. y=3x(x-2)+5

67. ## Pharmacy Practice

describe patient's issues that may arise in an institutional pharmacy setting and identifies issues unique to institutional pharmacy settings.

68. ## campbell

what is indigenous identity

69. ## math

A sample of 8 persons is selected for a test from a group containing 40 smokers and 15 nonsmokers. in how many ways can the 8 persons be selected?

70. ## MATH

what is th scientific notation for the number 385,000 i think 3.85x10^5

71. ## math

is 5^3 = 5x5x5

72. ## math

the number _________ is equal to 50,000+700+50+2

73. ## math

what two number complete 7 9 8 10 ___ ___ 10 12

74. ## math

mitch and jane met at the mall today. mitch goesto the mall every 3 day and jane goes to the mall every 5 days.how many times will they meet again in the next 3 weeks? is the answer 2 ????????

75. ## Chem

how many grams SO2 are produced when 20(g) FeS2 reacts with 16(g) O2? 4FeS2(g)+15O2(g)=2Fe2O2(s)+8SO2(g)

76. ## math

a phone call cost \$1.25 for the first minute \$0.10 for each additional minutes.A 10 minutes phone call cost

77. ## math

3.65x10^4 is it 36,400

78. ## t test

how to know exact t value using sample standard deviation and sample mean and sample size i think df is sample size -1 . we usually use approx value but to use exact value how to use t score table. and how we conclude whether it is two tailed test or one

79. ## chem 11

You have 2 chemicals A (solid) and B (solid), but you do not know the exact composition of either one of them. You do know that all together, there is SOME combination of sodium, barium, chloride and phosphate (PO4^3-) present. You dissolve both chemicals

80. ## Algebra

Atriangle has a base that is twice its height minus 4 feet. if the area is 15 square feet, find the height and base of the triangle.

81. ## Chemistry

Please help, I am having trouble solving these problems at nonstandard temperatures. Methanol burns in oxygen to form carbon dioxide and water. Using the balanced reaction, 2CH3OH(l) + 3OH2(g) --> 2CO2(g) + 4H2O(g) 1) Calculate delta H(rxn) in kJ at 24

82. ## chemistry

How many grams of FeCl2 should be dissolved in 1 kg of water to make its boiling point equal to 101.56 degrees centrigrade at atmospheric pressure of 1 atm? (Kb=0.52 degrees Celsius/m; solute is completely dissociated). Thanks!! =)

83. ## friction

A 15.0kg bix is released on a 32degree inclined and accelerates down the inclined at 0.30m/s^2. find the friction force impeding its motion.

84. ## College Physics

An electron orbits a proton at a radius of 5.38 10-11 m. What is the magnitude of the magnetic field at the proton due to the orbital motion of the electron?

85. ## Managerial Accounting Practices

Your general manager called you into his office to discuss an ongoing problem. He explains that in the past, whenever he wanted to know how the projected income statement might change if sales volume changes, it would take weeks to have the accounting

86. ## history

wher can i find information to help with this: How did the businesses of those like Morgan, Carnegie, and Rockefeller come to be so large?

87. ## english

How are stories used as a method of coping/a means of survival in Yann Martel's "Life of Pi" and Tim O'Brien's "The Things They Carried"? Specific examples please.

88. ## Research writing

What is he importance of literacy in our society?

89. ## algebra

I need help with this equation. y + 4y = 6 (1) x = 9 - 4y (2) Thanks for the help.

90. ## statistics t test

how to know exact t value using sample standard deviation and sample mean and sample size i think df is sample size -1 . we usually use approx value but to use exact value how to use t score table. and how we conclude whether it is two tailed test or one

91. ## Math

How do you find the perimeter and area of a right triangle?

92. ## INB

I need to create a 7-12 slide powerpoint with 3 references for Wal-Mart Takes on the World Minicase. I don't know where to begin and I have a difficult time with research. Consider the following scenario: Your boss, the CEO of Wal-Mart, is interested in

93. ## statistics

the average weekly earnings of a production worker were \$424. to know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is \$432.69, with a sample standard deviation

94. ## SCIENCE

IF A TORTOISE AND A HARE ARE RUNNING IN A RACE. AND IN MY GRAPH I HAVE DISTANCE IN THE VERTICAL SCALE AND TIME IN THE HORIZONTAL SCALE. THE TORTOISE IS RUNNING AT A CONSTANT RATE WITHOUT STOPPING. BUT THE HARE IS CONFIDENT AND HE STOPS HOPPING AND WAITS

95. ## SCIENCE

A TRAIN GOES FORWARD AT A SPEED OF 1M/S FOR 20 SECONDS. THEN IT STOPS AND GOES BACKWARD AT A SPEED OF 0.5M/S FOR 4 SECONDS. AFTER BOTH MOVEMENTS ARE COMPLETED, HOW FAR IS THE TRAIN LOCATED FORM ITS STARTING POINT? WHAT IS THE TRAIN'S FINAL LOCATION?

96. ## geometry

how can i identify iif it is coplanar,collinear or neither

what does "getting above your raisins" mean? thanks for answer my question:)

98. ## geography

the central location of india at the head of the india ocean is considered of great significance.why?

99. ## Physics

Three masses, m1 (a mouse), m2 (a bear) and m3 (an elephant), are in circular orbits of radii r1, r2 and r3 around the sun. The masses obey the relation, m1 < m2 < m3. While r1 and r2 are equal to Earth's orbital radius, r3 is equal to Jupiter's orbital

100. ## Algebra 1

Hello. I am having a bit of trouble understanding the following "Solve by Graphing. 3x + y = 5 -2x + 3y = 4" I know you can't see the graphing on this site, but I would really appreciate it if someone points me in the right direction in how to do this.

101. ## physics

A racing dog is initially running at 15.0 m/s, but is slowing down.How fast is the dog moving when its kinetic energy has been reduced by half? By what fraction has its kinetic energy been reduced when its speed has been reduced by half?

63728 divided by 9

103. ## Sci 245

can anyone help me with the id of minerals: borax, calcite, corundum, graphite, gypsum, orthoclase feldspar, pyrite, quartz, talc, and topaz.

104. ## math

Solve the equation 15.3 + 15 + 15.4 + 15.7 + x /5 = 15.4 thankyou

106. ## physics

A 2 kg brick is accidentally dropped off some scaffolding from a height of 20 m above ground levele.Calculate how much potential energy it will have lost by th e time it hits the ground.

107. ## physics

a brick is dropped (0 initial speed) from the top of a building. the brick strikes the ground in 2.5 seconds. you may ignore air resistant so the brick is in free fall. A)how tall in meters is the building? B) what is the magnitude of the brick's velocity

108. ## chemistry

1) DETERMINE pH of each of the following 2-component solutions. 0.08M RbOH & 0.130M NaHCO3

109. ## algebra

give an ordered pair (a,b)that satisfy the following equation 3a-b=7

110. ## Physics

You design an engine that takes in 1.5 x 10^4 J of heat at 650 K in each cycle and rejects heat at a temperature of 350 K. The engine completes 240 cycles in 1 minute. What is the theoretical maximum power output of your engine? can you please also show