# Questions Asked onMay 18, 2013

1. ## TRIGONOMETRY

Evaluate the expressions: a) arctan(-sqrt(3)) a) Arctan(-sqrt(3)) So, I know how to find the answers with a calculator, but how do I find it step by step?

2. ## Chemistry

the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction

3. ## chemistry

how many liters of oxygen are necessary for the combustion of 340 g of ethanol (c2h5OH) assuming the raction occurs at STP? no idea how to work this out

4. ## Chemistry

a .6800g sample of carboxylic acid is burned in oxygen, producing 1.212 g of CO2 and .4991 g of H2O. determine the empirical formula of the carboxylic acid

5. ## Chemistry

what is the total molar concentration of all the ions in .040 M solutions of the following salts in water? .040 M KCL .040 M CuSO4 .040 M CaCl2

6. ## Chemistry

How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide

7. ## TRIGONOMETRY

Use the dot product to determine which of the following vector pairs are orthogonal. a. v1 = (-5,5) and v2 = (1,1) b. v1 = (154,169.4) and v2 = (88,64)

8. ## physics

A rod of length 30.0 cm has linear density (mass-per-length) given by lambda = 50.0 g/m + 20.0 y g/m2 , where y is the distance from one end, measured in meters. (a) What is the mass of the rod? (b) How far from the y = 0 end is its center of mass?

9. ## chemestry

polycarbonate has a density of 1.2 g/cm3. a photo frame is constructed from two 3.00mm of polycarbonate.Each sheet measures 28 cm by 22cm. what is the mass of the photo frame?

10. ## math

A steel strip, clamped at one end, vibrates with a frequency of 20 Hz and a amplitude of 5 mm at the free end, where a small mass of 2 g is positioned. Find (i) the velocity of the end when passing through the zero position, (ii) the acceleration at

11. ## physcs

A small block of mass m1 = 0.500 kg is released from rest at the top of a curve-shaped frictionless wedge of mass m2 = 3.00 kg, which sits on a frictionless horizontal surface as in the figure below. When the block leaves the wedge, its velocity is

12. ## English

essay on once bitten twice shy

13. ## Physics 1

(I) determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it accelerates at a uniform speed of 15 m/s in 11 s, moving on a circular track of radius 500m. The cars mass is 1100kg.

14. ## Physics

Three objects are connected on an inclined table as shown in the diagram below. The objects have masses 8.0 kg, 4.0 kg and 2.0 kg as shown, and the pulleys are frictionless. The tabletop is rough, with a coefficient of kinetic friction of 0.47, and makes

15. ## physics

The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance d apart on the same axle (Fig. below). From the angular displacement of the two bullet holes in the disks and the rotational

16. ## geomerty

find the area of a circle circumscribed about a equalateral triangle whose side is 18 inches long

17. ## geometry

findthe exact area of the region bounded by two concentric circles with a radii of 10 and 6 inches

18. ## Algebra 2

Find the exact solutions of x^2 - (y - 12)^2 = 144 and y = -x^2. No solution?

19. ## TEACHER AIDE,CHILDREN, FAMILIES, SOCIETE

1. Larry is a very aggressive four-year-old child. He watches many television programs that contain violence. It’s most likely that A. he will become overactive. C. his behavior won’t change. B. he will become depressed. D. his behavior will become

20. ## Physics 1

(I) determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it accelerates at a uniform speed of 15 m/s in 11 s, moving on a circular track of radius 500m. The cars mass is 1100kg.

21. ## physics

¬Calculate the period of oscillation of a simple pendulum of length 1.8 m, with a bob of mass 2.2 kg. What assumption is made in this calculation? (g = 9.8 m s - 2) If the bob of this pendulum is pulled aside a horizontal distance of 20cm and released,

22. ## math

An unknown radioactive element decays into non-radioactive substances. In 100 days the radioactivity of a sample decreases by 64 percent. a)(a) What is the half-life of the element? half-life: b)How long will it take for a sample of 100 mg to decay to 51

23. ## Sociology of Sports

Would Someone PLEASE HELP? 1.Deviant overconformity is associated with some forms of violence in sports. The roots of this violence are grounded in (d) A. a desire for self-fulfillment and personal satisfaction. B.a lack of loyalty to team rules. C.the

24. ## ALGEBRA

7300 @ 7% COMPOUNDED SEMIANNUALLY FOR 3 YRS

25. ## Algebra II Part 2

Use a graphing calculator to solve the equation -3 cos t=1 in the interval from 0 to 2 p.Round your answer to the nearest hundredth

26. ## math

A 300 kVA transformer has a primary winding resistance of 0.4 Ω and a secondary winding resistance of 0.0015 Ω. The iron loss is 2 kW and the primary and secondary voltages are 4 kV and 200 V respectively. If the power factor of the load is 0.78,

In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in

28. ## Writing

can you check my grammar and spelling? and does it look better? Erin Oldham Calvin Brown 20 March 2013 ASL 2 ASL 2 Research paper I am writing about interviewing three Deaf Persons for my ASL research paper. The first person I interviewed is Christian

29. ## Algebra II Part 2

The equation h=7 cos{pi/3 t} models the height h in centimetres after t seconds of a weight attached to the end of a spring that has been stretched and then released. Find the times at which the weight is at a height of 1 cm,of 3 cm,and of 5 cm below the

Hey Mrs.sue, can you answer this question:How does the author establish the setting in the first chapters of the watsons go to Birmingham?

31. ## Physics

An arrow is fired horizontally from the top of a 40.0-m vertical cliff and lands 125 m away. Therefore the arrow was fired at _____ m/s.

32. ## TRIGONOMETRY

Can someone please show me step by step solutions? I'd appreciate if you did so I know how you get the answer. Thank you so much! Solve each equation, giving a general formula for all of the solutions: a)2sin^2 x-5sinx-3=0 b)(cosx-(sqrt2/2))(secx-1)=0

33. ## Math

Convert 3¾ % to a decimal.

What kind of relationship does Kenny and Joetta have?

36. ## Math

A letter carrier can deliver mail to 112 homes per hour by walking and 168 homes per hour by driving. By what percent is productivity increased by driving?

37. ## Chemistry

How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and carbon dioxide

How does the writer in the watsons go to Birmingham make the reader sympathize with Larry Dunn

39. ## chemistry

what is the normality and nature of the mixture obtained by mixing 0.62 gram of na2co3.h2o to 100 ml of 0.1N h2so4

40. ## statistics

A die has 2 red faces, 2 blue faces, and 2 green faces. It is rolled 240 times. Let R be the number of times red faces appear, and B the number of times blue faces appear. The random variable R is the sum of 240 draws at random with replacement from [pick

41. ## Math

After a 15% pay raise, Scott Walker now earns \$27,600. What was his salary before the raise?

42. ## Math

For example 80 71 43 65 45 is the winning number and 51 69 18 81 37 is the machine number,how do i solve this problem to get the accurate next winning numbers from 1-90? Tutor me the exact calculation and formula please.

43. ## hsa practice

Stephanie scored 88, 70, 84, and 72 on her first four science tests. What score does Stephanie need on her fifth science test to receive a mean score of 80? can you give me the steps to solve this im practicing for hsa

44. ## math

By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? (Round percent to the nearest tenth.

45. ## math

by what percent os a 100- watt light bulb brighter than a 60 watt light bulb

46. ## Algebra 2

Write the expression 13m^8 - 3m^4 + 4 in quadratic form if possible. m^8?

47. ## Trigonometry

Given that sin alpha = 15/17 and -360

48. ## math

40% to 525 what is original amount.

49. ## M.m.m.campus (chemistry)

Laboratory preparation of carbon dioxide?

50. ## math

Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month? which ratio do I do this under? For example Portion=Rate x Base

51. ## French

Could you please tell me whether the following French paragraph is correct? As in, do my verbs agree and is it grammatically correct? Le Sacre-Couer est une eglise catholique a Paris. Il est tres beau, et tres grand. Au Sacre-Couer, vous pouvez prenez des

52. ## Chemistry

A 12% solution is diluted 1:60. What is the volume and concentration of the final solution? I started off with this 12(1/60) = 0.2% However, how do I get the final volume and concentration? Thanks

53. ## Algebra 2

State the possible number of imaginary zeros of f(x)= 2x^3 - 4x^2 + 8x - 3. 0,1,3?

54. ## Statistics

A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet \$1 on this game 600 times independently. 3A - Find the expected number of times you win. 3B - Find the SE of the number of times you win. 3C - Find the chance that you lose

55. ## Math

Kylee bought a pack of 12 cookies. Two thirds of the cookies are peanut butter. How many cookies in the pack are peanut butter?

56. ## Minima Maxima

Find and classify the relative maxima and minima of f(x) if f(x)= defint a=0 b=x function= t^2-4/(1+cos(t)^2) dt x^2-4/(1+cos(x)^2)= 0 x^2-4=0 x^2=4 x= +/- 2 So I got relative maximum as -2 and 2. And relative minimum as zero. However, when I graph it on

57. ## life orientation

identify one environmental or human factor that causes ill health or accidents or disasters within your community or any other community within south africa

58. ## science

A scientist experiments on two different pairs of objects. During the experiment, the objects in one of the pairs are brought into contact with each other; the objects in the other pair are brought close together, but they do not touch. The scientist then

59. ## math

Triangle DEF is such that DF=8cm,EF=5.5cm and its area is 11 root2 cm^2. Find angle EFD.

A point charge of charge 1 mC and mass 100 g is attached to a non-conducting massless rod of length 10 cm. The other end of the rod is attached to a two-dimensional sheet with uniform charge density σ and the rod is free to rotate. The sheet is parallel

61. ## Math

If a number increases from 47 to 70.5, what is the rate of increase?

62. ## accounting

Discuss how the net promoter score is calculated. Show an example of a calculation of a net promoter score (use the data below). What does this score mean specifically in this example? Discuss how the net promoter score can assist in the value of a

63. ## China And India culture

compare and contrast the legacies of cultural syncretism in china and India and the Americas with the resistance to cultural change westerners encounter

64. ## math

ABC is a triangle with a right angle at A. M and N are points on BC such that AM is the altitude, and AN is the angle bisector of ∠BAC. If CN/NB=21, what is CM/MB?

65. ## Statistics

A group of 30 people consists of 15 children, 10 men, and 5 women. Tom and Jerry are two of the men in the group. Five people are picked at random without replacement. 2A - Find the chance the first person picked is a man, given that the fourth and fifth

66. ## physics

explain the law of motion needed to slove this problem. On Planet Zorg, a 30kg barbell can be lifted by only exerting a force of 180N. what is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change on earth.

67. ## science

List the energy conversions in these situations. A drum set causes many dishes to rattle. Temperature differences cause wind.

68. ## Statistics

A gambling game pays 4 to 1 and the chance of winning is 1 in 6. Suppose you bet \$1 on this game 600 times independently. 3A Find the expected number of times you win. 3B Find the SE of the number of times you win. 3C Find the chance that you lose more

69. ## Science

Explain the law of motion needed to solve thisproblem . On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force fo 180N. What is the acceleration of gravity on Planet zorg? Predict how the motion of this object would change if on earth.

70. ## L.O

Critically discuss 10 ways in which the environmental health hazards can impact negatively on one's health

71. ## Physics

The radius of planet X is 5.0 bleems. It takes 4 earth years to complete it's orbit. Another planet, Z, orbits the same sun and has an orbit with the radius of 12 bleems. How long does it take for planet Z to complete an orbit?

72. ## Chemistry

How much 3M H2SO4 can be made from 20ml of 12N H2SO4?

73. ## math

If the bearing fron H to G is 098 degrees, what is the bearing of G from H

Find two models for ethical decision making, or for decision making in Where do they differ? What is missing in each model? What is the difference between a “framework” and a “decision making model”?

75. ## statistics

Rank the three events below in increasing order of probability. For example, if you choose â€œA B Câ€, you are saying that A has the smallest chance, B has more chance than A but less chance than C, and C has the biggest chance. [If you think that

76. ## Math help urgent

I have a few questions that i need help with so can someone pleese help me thanks:) 1. represent each with an ineqaulity a.) time spent on the activity can be at most 13 mins b.) the volume of the container must be a minimum of 1.8 L and a max of 2.5 L 2.

77. ## Algebra

Calculate elements the listed element for the product matrix. matrix[1, 2, -3_3, 4, 0_-9, 7, 8_9, 3, 2]Xmatrix[11, 7, 9, -5_5, -9, 1, 6_4, 2, -3, -8] Can someone please help me with this. I'm desperate.

78. ## Chemistry

In basic solution disproportionate to bromited bromide ions. Use the half reaction method to balance the equation.

79. ## Math 4 questions

I posted these questions earlier but noone answered them and i really need help so can someone help me. 1. represent each with an ineqaulity a.) time spent on the activity can be at most 13 mins b.) the volume of the container must be a minimum of 1.8 L

80. ## math

Three of every seven sales transactions at Dollar Discount are on credit cards. What percent of the transactions are not on credit card sales?

81. ## math

22. Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month? (Points : 2)

82. ## physics

I need help devloping a procedure: Using several bags filled with different amounts of the same item, take the mass of each and develop (and enact) a procedure to determine the mass of a single item....This procedure is supposed to model Milikans oil drop

83. ## physics

A hollow steel shaft has an external diameter of 120 mm and is 10 mm thick. It is coupled to a solid shaft of the same material, 100 mm in diameter. If the length of the hollow shaft is 960 mm, find the length of the solid shaft, so that the total angle of

84. ## Math

graph the points. Plot C-values on the x-axis and F-values on the y-axis. connect the points with a line

85. ## math

Solve the equation 8 cos^2 X -2 =0 given that 180< or equal to X

86. ## college of cape town

A gas at 273 kelvin expands by 0,1 cubic metre if it is heated through 50kelvin. Calculate the original volume at constant pressure.

For a set of numbers T, we say that T has distinct subset sums if all distinct subsets of T have distinct sums. How many subsets of {1,2,3,4,5,6,7,8} have distinct subset sums?

88. ## Phoneix

Jarman consulting inc. provides financial and estate planning services on a retainer basis for the executive officers of is corporate clients. it incurred the following labor costs on services for three corporate clients during march 2006. Driect labor

89. ## chemistry

which orbitals have centre of symmetry

90. ## Algebra 2

Solve the system: y^2 - 4x^2 = 4 and y = 2x. (-1,-2)?

91. ## Algebra II Part 2

Use an angle sum identity to verify the identity cos 2 0=2 cos 0-1

92. ## algebra

Find all real solutions. SR (x^2+3x+6)=4

93. ## Chemistry

how many outer shell electrons does a carbon atom have using periodic table?

94. ## math

after7rounds is a knockout chess tournament,the winner was announced.How many contestants were there have been in the tournament?

95. ## math

What is 7,000 decreased by 62%

96. ## math

What is 1250 divided by 23???

97. ## Chemistry

A solution of NaCl and glucose gives a freezing point of -0.95°C. It contains 140 mOsmol glucose/L. Give concentration of NaCl in milliosmoles per liter and molarity. Thanks

98. ## Spanish

1) Mis abuelos viven en Manhattan. ______ apartamento es grande y bonito. A. Sus B. Su C. Nuestros D. Nuestro I said A 2) Para la comida, ¿ _______ Evangelina y tú el pescado o el bistec? A. prefieren B. prefiero C. prefieres D. prefiere I said D 3)

99. ## Algebra

The three interior angles in a triangle are x ∘ , (2x+24)∘ and (3x+48)∘ . What is the value of x ?

100. ## mts 106

Find the gradient at the point (1,1) of the tangent line to the curve x^2+y^2-3x+4y-3=0.

101. ## Math

Convert 12.6 to a percent.

102. ## Math

Convert 53 to a percent.

103. ## Math

Convert 217% to a mixed number.

104. ## physics

Marks: 1 A car merges onto the highway from rest in 10 seconds. The final speed of the car is 60 mph. Estimate the acceleration of the car.

105. ## Physics

2 factors that increase static friction? Could it be weight or the ground?

106. ## LIFE ORIENTATION

DESCRIBE THE LIFESTYLE DISEASE & EXAMPLES & FACTORS THAT CONTRIBUTE TO THE DISEASE

107. ## mathematic

In surveys about sensitive topics, respondents are sometimes given ways to “hide” their answers from the surveyor. In a survey of taxpayers, one of the questions is, “Did you cheat on your taxes?” To answer, the respondent is asked to toss a coin.

108. ## Maths

Find the largest possible value of n, such that there exists n real numbers x1,...,xn which satisfy |xi−xj|>1/100(1+xixj) for all values of i≠j.

109. ## help

a store does a display of 200 balls, he places them in the shape of a square pyramid. the bottom layer has 64 balls for each consecutive layer of balls, one ball is placed where 4 balls meet. how may layers will be in the pyramid? how many will be left

110. ## math

Let S be the set of {(1,1),(1,−1),(−1,1)}-lattice path which begin at (1,1), do not use the same vertex twice, and never touch either the x-axis or the y-axis. Determine the largest value of n such that every path in S which ends at (n,n) has length at

111. ## Math

I posted these questions earlier a lot of times but noone answered them and i really need help so can someone help me. i don't want all the answers, can someone just do like the first 2 so i get an example of how to do them. thanks 1. represent each with

112. ## Introduction of Psychology

When physical energy has resulted in a response in asense organ, it is clear that:

113. ## physics

In a string instrument.If I pluck the same string at different places,will the frequencies be the same?Can someone explain it to me?

114. ## hsa practice

2.6, −5.2, 10.4, −20.8, . . . 6th term? what is an easier way to find this?

115. ## math

any helpful hints for solving equations?

116. ## Multiplication

what is 1250* 2987??

117. ## Math

Convert 422% to a decimal.

118. ## Math

Convert 33/4 to a percent.

119. ## Math

By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? (Round percent to the nearest tenth.

120. ## Math

Sunshine Honda sold 112 cars this month. If that is 40% greater than last month, how many cars were sold last month?

121. ## English

Can someone give an example of Campaign Speech that involves about a recent celebrity. Thank you in advance. Sincerely, Kink

122. ## Algebra II Part 2

Verify the identity cot{0-pi/2=-tan 0

123. ## Introduction to Psychology

A load W=2 kN is applied vertically to joint C of truss ABCDE as indicated. You will use the method of joints to obtain the axial forces in the bars and reactions at the supports A, E . We start with the classification of the degrees of freedom as "free"

125. ## hsa practice

when giving a table and they ask for an equation i know how to find the slope by picking to points and doing the formula y2-y1/x2-x1 but how do you find the y-intercept when they don't give you any pints with (0,?)