# Questions Asked onMay 12, 2013

1. ## physical chemistry

The system N2O4 2NO2 maintained in a closed vessel at 60º C & a pressure of 5 atm has an average (i.e. observed) molecular weight of 69, calculate Kp. At what pressure at the same temperature would the observed molecular weight be (230/3)

2. ## Trig

The postal service places a limit of 84 inches on the combined lenght and girth (distance around) of a package to be sen parcel post. What Dimensions of a rectangular box with square cross-section will contain the largest volume that can be mailed?

3. ## chemistry (ionic eq.)

what mass of Pb^2+ ion is left in solution when 50 ml of 0.2M PbCl2 is added to 50ml of 1.5 NaCl?[Ksp for PbCl2= 1.7* 10^(-4)]

4. ## applications of vectors

Two people are carrying a box. One person exerts a force of 150 pounds at an angle of 62.4 degrees with the horizontal. The other person exerts a force of 114 pounds at an angle of 54.9 degrees. Find the weight of the box.

5. ## Chemistry

Two gases effuse through a hole. Gas A has 9 times the molecular mass of gas B. What is the ratio of the two molecular speeds?

6. ## Precalc

Find a formula for the nth term if... a)the 8th term is 8 and the 20th term is 44 b) the 8th term is 4 and the 18th term is -96 thanks!! I am just confused how you do this if you don't know what n is.

thanks for helping me! You spin the spinner twice. draw a tree diagram and list sample spaces to show the possible outcomes. From that answer questions 1,2 and 3. The spinner is 4 equal parts for a, b, c ,d I know the tree diagram- you Have a,b,c,d, and

8. ## Physics

Calculate the power of a hair dryer that operates on 120V and draws a current of 10 A.

9. ## chemistry

write a balanced net ionic equation for the overall reaction represented by the cell notation below. Pt/ Fe2+, Fe3+ // I-/AgI/Ag

10. ## Chemistry

How many grams of nitric acid (HNO3) must be dissolved in 740 mL of water to make a solution with a pOH = 8.3?

11. ## chemistry

Calculate Ecell forthe following electrochemical cell at 25 C Pt(s) |H2(g, 1.00 bar) |H + (aq, 1.00 M) || Pb2+(aq, 0.150 M) | Pb(s)

12. ## financial alg

Forrest purchased a car for $20,640. He made a down payment of$2,440. He applied for a five-year installment loan with an interest rate of 10.4%. What is the total cost of the car after five years?

13. ## math

a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss? I think it is 1/2 because the coin has 2 sides and 50% it will land on heads. My friend thinks

14. ## Physics

What is the net upward force on an airplane wing of area 22.0 m2 if the speed of air flow is 315 m/s across the top of the wing and 270 m/s across the bottom?

15. ## math for laboratory science

Determine the quantity of stock 75.0% v/v EtOH required to prepare 300ml of a 25.0% v/v EtOH solution

16. ## College algebra

The radioactive element has a half-life of about 28 years and sometimes contaminates the soil. After 47 years, what percentage of a sample of the elements remain?

17. ## math

Find the number of 6 -term strictly increasing geometric progressions, such that all terms are positive integers less than 1000.

18. ## statistics

A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.07 ounce. You can allow the cup to overfill 2% of the time. What amount should you set as the

19. ## Chemistry

An 800-mg sample containing sulfate was treated with slight excess of barium chloride, yielding a precipitate that contained 4.3 mg of co precipitated CaCO3. after ignition and cooling, the precipitate weighed 277.0 mg. Calculate the a.) apparent % SO4 b.)

20. ## math

a square sheet of tin 30cm on a side is to be used to make an open - top box by cutting a small square of tin from each corner and bending up the sides. how large should be the square cut from each corner to make the box's volume as large as possible

21. ## science

assign oxidation numbers to each atom in the following compounds : Hi Pbr3 Ges2 Kh AS2O5

22. ## ashford

16. Functional foods are those containing nutritional supplements in addition to natural nutrients. Examples include orange juice with calcium and eggs with omega-3. Kolodinsky, et al. (2008) examined attitudes toward functional foods for college students.

23. ## math

Part 1: Write two conditional statements for which the converse is true. 1. Statement: 2. Converse: 3. Statement: 4. Converse: Part 2: Write two conditional statements for which the converse is false. 5. Statement: 6. Converse: 7. Statement: 8. Converse:

24. ## Math

Adam and Bob went apple picking in an orchard. At the end of the day, they counted the number of apples they picked. They realized that if Adam picked 39 more apples, he would have picked twice as many as Bob picked. Also, if Bob picked 39 more apples, he

25. ## College algebra

The population P of a city has been increasing at an annual rate of 1.4%. It's population was 173 thousand in 1992. A. Find a formula for P(t), where t is the year and P is in thousands. B. Estimate the population in 2010, to the nearest thousand. C. In

26. ## physics

Three identical conducting spheres are located at the vertices of an equilateral triangle ABC. Initially the charge the charge of the sphere at point A is q A =0 and the spheres at B and C carry the same charge q A =q B =q. It is known that the sphere B

62. ## statistics

Consider a normal distribution with mean 20 and standard deviation 3. What is the probability a value selected at random from this distribution is greater than 20?

63. ## math

Elijah draws shapes on his graph paper.He draws a square with sides 1/2 inch long. He draws an equilateral triangle with sides that are 1/4 inch long. What is another measurement that describes the length of the triangle's sides ? a. 2/1 inch b. 2/2 inch

64. ## Math

I made a 95 on a test of 20 questions, but it took 35 tries. What is my real grade?

65. ## life orientation

two institutions/community organizations that are involved in redressing teenage pregnancy

66. ## financial accounting

If Kennedy has a net loss of \$1,600 cash and then liquidates, what amount of cash will the creditors receive? What amount of cash will the investors receive?

67. ## Mechanics

The cylindrical bar in the figure has a total length L=1.2 m, a diameter d=15 mm, and is confined by fixed supports at the walls A and B. A concentrated axial load FC=30 kN is applied to the bar at point C as indicated in the figure, with LAC>LBC. The bar

68. ## Physics- Simple machines

A wheel and axle arrangement has an axle with a diameter of 25cm. A rope is wrapped around the axle and is supporting a load of 2 tonnes. 1) If the mechanical advantage of the system is 30, determine the diameter of the wheel___________m. 2)Determine the

69. ## algebra

Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine,2.44 cross 10^(−5)watts/cm2.

70. ## Pre-calculus

Given that alpha=(14pi/3) what is the least positive angle coterminal with alpha?

71. ## Chemistry

If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?

72. ## Calculus

ç1 0 x^2dx=1/3. Use this and the properties of integrals to evaluate ç1 0 10−2x^2dx

73. ## Maths

Thanks Mr Reiny

74. ## statistics

a basketball scout randomly selected 144 players and timed how longeach player took to perform a certain drill. The times in the sample were distributed with a mean of 8 mins. The population standard deviation was known to be 3 minutes. Using a 95%

75. ## Calulus

Use the Midpoint Rule with n =3 to approximate the integral ç−1−8(10x−9x2)dx

how would you explain the redeeming value of sexual appeals in advertising? if sexual appeals are considered okay by the targeted audiences, what responsibily does the advertiser have for indirect targets such as children and how can advertisers protect

77. ## Life Oriantation

Topic: poverty in the community /in schools, five ways in which the human or environmental problem impacts on the community.provide relevant sources to support your claims.

78. ## phoenix

Each sample has n= 5 scores with s2 =38 for the first sample and s2 = 42 for the second. (Note: Because the two samples are the same size, the pooled variance is equal to the average of the two sample variances.)calculate how much difference should be

79. ## life orientation

Name two intitutions/community organizations that are involved in supporting or giving redress to teenage pregnancy.explain how these organizations are involved in providing a safe and healthy environment.

80. ## Statistics

A simple random sample of 50 students is taken from a class of 300 students. In the class, * the average midterm score is 67 and the SD is 12 * there are 72 women Let W be the number of women in the sample, and let S be the average midterm score of the

81. ## Math (Algebraic Manipulation)

An operation produces A−1/A from a fraction A= m/n, where m ≠ n and m ≠ 0. If the initial value of A is 24/47 and the operation is repeated 2012 times, the final output is a/b, where a and b are coprime positive integers. What is a+b?

82. ## math

Which sign goes in the box to make the number sentence true? 7/8 ? 1 a. = b. + c. > d.

83. ## math

Which sign goes in the box to make the number sentence true? 3/4 ? 6/8 a. > b. < c. = d. +

84. ## Math

Malia puts together six 4-by-4-by-1 inch square layers with 1-inch cubes, then stacks them up to form a rectangular prism. This prism rests on a wooden table, on its square base. All the 1-inch cubes Malia used are white except one, which is red. As a

85. ## math

write as an equivalent decimal or a decimal approximation. 4 12/19

86. ## Happy mother's day

To Ms Sue and Ms Reiny, who have helped me with homework questions in the past Happy mother's day. To all the other tutor's who are also mother's that have not helped me yet, happy mother's day to you too. Enjoy!

87. ## Life Orientation

In 10-15 lines critically discuss 5 ways in which HIV/AIDS impacts on the community.Provide relevant sources to support your claims

88. ## social studies

In 10-15 lines critically discuss 5 ways in which HIV/AIDS impacts on the environment.Provide relevant sources to support your claim

89. ## College algebra

Use the properties of logs to write the expression as one log: 8log(base 5)4th square root of x minus 4log(base 5) x

90. ## geometry

write and equation of a line perpendicular to the line y=1/2x+10 and passes through (0,3)

91. ## Math

if cosx equals square root 3 over 2, find sinx

92. ## Body systems and related conditions

Report for HIV/AIDS

93. ## Science

Metals used in the home and classification. Uses and how they may be cared.

94. ## PreCalculus

PLEASE HELP ME ASAP!!!!!!!!!!!! :) I really need to remember on how to do this equation. Solve the system algebraically. y=25x^2+x 9x+y=3

95. ## Math

The terminal side of an angle alpha (in standard position) contains the point (-3,-4). Find sec alpha.

96. ## Math

6(y²-2) + y < 0

97. ## Calculus

Estimate ç4 1 ln(x)−3dx using 6 midpoint rectangles

98. ## life orientation

name two organisation that are involed in helping peaple affected by flood

99. ## chemistry

14. The reaction H2S (aq) = HS-(aq)+ H+(aq) has pK = 7 at 298 K, 1bar. Consider a solution in which total dissolved sulfur is 10^-5 molal. At pH = 3, pH2S =

100. ## math

what is 9.8 convert to ml

101. ## Life orientation

Ways in which smoking impacts on your community

102. ## physics

the greatest accerlation or decerlation that a train may have is a.the minimum time in which the train can start from one station from other is > i need it with steps..

103. ## Physics

What is the change in angular momentum of a planet with radius R if an asteroid mass m and speed v hits the equator at an angle from the west, 40 degrees from the radial direction?

104. ## Math (Algebra) (Distance Between 2 Lines)

If real numbers a and b satisfy a^2 + b^2 = 64, what is the distance between the lines ax + by = 1 and ax + by = 417 ?

105. ## Math (Calculus) (Implicit Differentiation)

The equation of the line tangent to (x^2+y^2)^4=16x^2y^2 at (x,y)=(−1,1) is ay = bx + c, where a, b and c are positive integers. What is the value of a+b+c?

106. ## math

Which fraction is greater than one whole? a. 1/7 B. 6/5 C. 9/9 d. 13/15

107. ## Math

Wich fraction is less than one whole? a. 12/11 b. 3/3 c. 13/7 d. 7/8

108. ## math

Witch fraction represents the same amount as 1/2 ? a. 1/4 b. 2/4 c. 2/1 d. 3/2

109. ## math

Which fraction represents the same amount as 5/5 ? a. 10/5 b. 5/1 c. 10/10 d. 1/5

110. ## life orientation

In 10-15 lines critically discuss 5 ways in which the human or environmental problem impact on the community

111. ## math

Which number sentence is true? a. 5/14=5/9 b. 5/14>5/9 c. 5/9>5/14 d. 5/9=5/14

112. ## math

Doyle,Lena, and Juan played checkers 12 times. Doyle won 1/2 of the games, Lena won 5/12 of the games, and Juan won 1/12 of the games. Who won the least number of games? a. Lena b. Juan c. Doyle d. Cannot besolved