# Questions Asked onAugust 3, 2011

1. ## physics

A car of mass 1200kg travelling @ 72 km/h is brought to rest in 4s.Find a) the average deceleration b)the average braking force

2. ## chemistry

Sodium carbonate reacts with hydrochloric acid as shown below in an unbalanced chemical equation. What mass of CO2 is produced from the reaction of 2.94g Na2CO3 with excess HCL?

3. ## physics

A hiker climbs a hill 300m high.If she weighs 50kg,calculate the work she does in lifting her body to the top of the hill

4. ## English/Writing

According to the authorities; only 35% of the criminals go to jail. a:use a period after "authorities" b:use a comma after "authorities" c:use a colon after "authorities" d:there are no errors ---- My answer is "d" Is that correct?

5. ## physics

A)When the energy input to gas fired power station is 1000MJ,the electrical energy output is 300MJ.What is the efficiency of the power station in changing the energy in gas into electrical energy b)what form does the 700MJ of lost energy take c)what is the

6. ## chemistry

1. A solution of sodium oxalate has a pH of 7.82. The [OH-] in mol/L must be which of the following: a) 6.18 b) 1.5 x 10-8 c) 6.6 x 10-7 d) 7.82 e) -7.82 2. When 0.93 mol of O2 and 0.56 mol of NH3 are mixed together and allowed to come to equilibrium

7. ## math

a cylindrical container has a base radius of 14cm and height 18cm. How many litres,correct to the nearest litre, of liquid can it hold. Take 22/7

8. ## statistics

A sales firm receives an average of four calls per hour on its toll-free number. For any given hour, find the probability that it will receive exactly eight calls

9. ## physics

A car of mass 1200kg travelling @ 72 km/h is brought to rest in 4s and has a deceleration of 5m/s find the distance moved during the deceleration

10. ## chemistry

PCL5(g) -> PCl3(g) + Cl2 (g) Kp= 23.6 at 500K Calculate the equlibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.560atm and Ppcl3 = 0.500atm.

11. ## chemistry

What mass of PbCl2 would be found in 0.48 L of a saturated solution of PbCl2 if the Ksp of PbCl2 is 1.6 x 10-5?

12. ## math

In a bag there are red, green, black,and white marbles. If there are 6 red, 8 green, 4 black, and 12 white and one marble is to be selected at random, what is the probability it will be white? I don't know how to solve these.

13. ## chemistry

In a methane fuel cell, the chemical energy of the methane is converted into electrical energy instead of heat that would flow during the combustion of methane. Using the half-reactions and reduction potentials given below a) Write a net equation for the

14. ## chemistry

In a methane fuel cell, the chemical energy of the methane is converted into electrical energy instead of heat that would flow during the combustion of methane. Using the half-reactions and reduction potentials given below a) Write a net equation for the

15. ## chemistry

For the equilibrium system below, which of the following would result in an increase in the concentration of CO(g)? 2H2(g) + CO(g) CH3OH(g) + 92 kJ a) decreasing temperature b) adding some CH3OH c) both b and d d) decreasing the volume of the container e)

16. ## chemistry

1.) For which of the following substances is the standard enthalpy of formation equal to zero? a) water [H2O(l)] d) carbon dioxide [CO2(g)] b) lead [Pb(l)] e) tin [Sn(s)] c) carbon dioxide [CO2(s)] 2.) Consider the following four equations: 1. C6H6(l) +

17. ## English/Punctuation/Grammar

"This will not be endured!" he roared. a:correct b:incorrect ---- My answer is "a" Is this correct?

18. ## Geography

How were the traditional Southeast Asian farmers affected by European colonization? A. They became wealthy from the rising values of the cash crops they grew and exported to Europe. B. Unable to compare with large landowners, they were forced to leave

19. ## Career research/Decision making

If you borrow money from post-secondary education. a:you never have to pay it back. b:you owe it back. c:none of the above ---- My answer is "b" Is that correct?

20. ## Identifying Furniture Styles & Periods

1. Which one of the following elements is characteristic of Gothic furniture? A. Melon-bulb turnings B. Tracery designs C. Carving of acanthus leaves D. Animal shapes 2. A sideboard is a A. type of card table. B. drop-leaf table. C. chest of drawers. D.

21. ## geometry

The diagonals of a rectangle ABCD meet at O. If angle BOC is equal to 44 degree, find angle OAD.

22. ## science

what is the dependent and independant variable, force or pressure?

23. ## Mathematics

1. Show that Sin3è - Cos2è = (1 - Sinè)(4Sin^2è + 2Sinè - 1). Without using a calculator, show that è = 18 degrees is an exact solution of the equation Sin3è = Cos2è. Justifying your answer, find the exact values of: i) Sin18 degrees. ii) Sin234

24. ## Math

There are a total of 107 chickens and rabbits on a farm. The total number of legs of rabbits is 56 more than the total number of legs of chickens. How many chickens are there on the farm?

25. ## Human Services

Calculate the fixed cost, variable costs, and break-even point for the program suggested in Appendix D. BASED ON THE ASSIGNMENT DIRECTIONS FOUND IN THE COURSE MATERIALS FOLDER. · Base your calculations on the financial data for 2002. XYZ NON-PROFIT

26. ## Biochemistry

Given that ∆Go’ = -15 kJ/mol and k1 = 1.5 X 10-6s-1, calculate k2.

27. ## pre-algerbra

step by step how to solve algerba problems

28. ## maths

The second angle of a triangle is 4 times as large as the first. The third angle is more than the sum of the other two angles. Find the measure of all three angles.

29. ## pre calc

A graph of y = cos(1/2 x) - sin( x) for -4ð x 4ð is shown in the figure. Assume z = 4. (the figure is just the graph) its asking me to find the x intercepts but i don't know how. it also asks me to find: The x-coordinates of the eight turning points on

30. ## social studies

Conduct a research to examine the sphere of influence of an organisation that renders a service in your area,hospital.purpose of the organisation.

31. ## biology

an investigation was done to determine the role of petals in insect pollination in apple flowers.when flowers are self pollinated,the tubes grow a little into the stigma and style and fertilization does not take place.(1)10 flowers with petals and 10

3(4x=5)=63

33. ## maths

A pie graphs show the budget of 2 business for 2 different business.How do you work out the different expenses each month and Calculated the cost in Rands.1 company budget is R12000 and other is R9200.How do u work out the pie graphs .need to get the

34. ## chemisty

Farmers often spray water on plants when there is a chance of frost to protect them from freezing. Calculate the amount of heat released when 100 mL of water at 25oC cools to -2oC. (ΔHfusion water is 6.03 kJ/mol, cwater = 4.18 J/(goC), cice = 2.01

35. ## chemistry

What mass of PbCl2 would be found in 0.48 L of a saturated solution of PbCl2 if the Ksp of PbCl2 is 1.6 x 10-5?

37. ## Chemistry

How many moles of Ne occupy 2.0 L at STP?

38. ## physics

What are the maximum values of the following when an incandescent 55-W light bulb (at 110 V) is connected to a wall plug labeled 110 V?

39. ## physics

A transformer with 360 turns in its primary coil and 18 turns in its secondary coil is designed to delivered an average power of 1400 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?

40. ## science

determine your distance traveled and displacement if you walk 100m forward and then 35m backward

41. ## Helping Abused children

Please help 4. As a teacher aide, if you report an incident of child abuse, A. you must be able to prove your allegations to the authorities. B. you’ll most likely be asked to testify in court. C. you should keep all information related to the case

42. ## algebra

Will someone check my work here and let me know if I am right. Thanks. Evaluate x+y/7 for x=44 and y=12 My answer is x+y/7=8 2. Translate to an algebraic expression. The product of 42% and some number. The translation is .42x=y 3. Use < or> to make the

43. ## physics

An apple of mass 0.1kg is thrown from a 54 meter high building at an angle of 45 degrees with an initial velocity of 7. How long does it take for the apple to hit the ground? (assume g = 9.8 m.s-2)

44. ## chemistry

An 8.6 g sample of a metal is heated to 110.0oC and then placed in a coffee cup calorimeter containing 125 g of water at a temperature of 23.00oC. After the metal cools, the final temperature of the metal and water is 26.83oC. Assuming that no heat is lost

45. ## intermediate algebra

SOLVE BY FACTORING 2a^2-3a=-5

46. ## physical science

A 4.0 -m ladder leans against a vertical wall and makes an angle with the horizontal ground of 52degrees. What is the height above the ground where the ladder makes contact with the wall?

47. ## chemistry

Given that ΔHof of copper (II) chloride, CuCl2(s), is –220.1/kJ and ΔHof of copper (I) chloride, CuCl(s), is –137.2 kJ, calculate ΔHo for the reaction when 14.0 g of copper is used: CuCl2(s) + Cu(s) → 2 CuCl(s)

48. ## math

what is (x to the 3rd power + x to the 2nd power) divided by ((x+4)(X-4)) multiplied by (x+4) divided by (3x to the 4th power + x to the 3rd power + 2x to the 2nd power)

49. ## algebra

Please check these too. thanks Simplify 6[86-(94-86)]= my answer is 468 2. On three consecutive passes, a football team gains 6 yards. loses 17 yards and gainbs 31 yards. Wht number represents the total net yards. The total net years is 20 yards. 3. Solve

50. ## math

Write the slope-intercept equation for the line with slope -2/3 and y-intercept (0, 3) and graph the line. Please show all of your work. (

51. ## art

10th century copper sculpture illustrated work of artist peforming "giving tangible form to the unknown" the unknown case in this is what diety

52. ## chemistry

1.If its molar solubility is designated by “x”, then which of the following expressions best represents the solubility product for the substance Ag2SO4? a) x2 b) 27x4 c) 4x3 d) 108x5 e) 3x4 2. Consider the equilibrium, 4HCl(g) + O2(g) 2H2O(g) +

53. ## algebra

Solve 8x-(4x+4)=20 Ms. Sue would the answer be 3/2?

54. ## Calculus

put function in standard form f(x)=-4x^2-32x+9

55. ## CJ101

Describe what SARA is and explain how it is used in fighting crimes. In what type of policing model is SARA most effectively used? Why?

56. ## algebra

would the answer to 8x-(4x+4)=20 would that be 6 then? I posted it wrong before thank you for helping

57. ## bio

Name some plants (or even animal products) that are said to have properties that are beneficial to humans. Describe how you would show whether those claims are true. please a need help i am in the hospital

58. ## maths

Write the slope-intercept equation for the line that passes through (2, -4) and has slope -7/2.

59. ## intermediate algebra

rewrite with positive exponents. Assume that even roots are nonnegative quanities and that all denominators are nonzero. [3/ua^2)^-4

60. ## science

Write ideas for the inquiry project and area of expertise

61. ## English

It also affects the way in which one family relates to another, to the neighborhood, and to the community What correction should be made to this sentence?

62. ## Algebra II

this is the question: Rewrite the equation with the right side completely factored. N =-2x^2 + 76x + 430

63. ## math

7(ac + 2b) + 2ac

64. ## Vocab./English

The mom left the room with a MODICUM (small amount) of respect after her baby began... a:sleeping b:screaming --- My answer is "a" is that correct?

65. ## math

A pie graph show two different business if transport is the greatest expenses of one is how do u Calculates the cost in rands•

66. ## COM155

Use at least five adverbs and five adjectives to write a brief review of a movie, sporting event, musical performance, or television show. Bold each adverb. Underline each adjective. Compare the event to one or more similar events. When comparing, use at

67. ## English/Writing

An appositive is a noun that is placed after another noun in order to tell more about it an it's usually set off with commas. a:true b:false ---- My answer is "a" Is that correct?

68. ## Chem/Solution Concentrationa

How many gtams of potassium bromide(KBr), could be recovered by evaoportating 650.g of 15 percent KBr solution to dryness? Can you explain how to solve this?

69. ## physics

A box of mass 5 kg is pulled along a horizontal frictionless surface by a force of 40N inclined @ 30dgrees. Calculate A)the work done by the force over a distance. B)the speed gained by the box after travelling 10m.

70. ## Latin American History

________ or "government by a few" is common in Latin America. a:democracy b:republic c:oligarchy d:dictatorship ---- My answer is "c" Is that correct?

71. ## Physics

A chair lift carries people of average mass 75kg to a height of 450m above the starting point. Calculate a) the work done by the chair lift to move one person through 450m. b) the power expended to carry 60 people every 5 minutes.

72. ## math

give me an ex. about close to 1,1/2,0 pls. for my project THANKS

73. ## MATH

about math EX. 9/10 is close to 1 THANKS AGAIN

74. ## physics

A block of mass 2kg is pushed along a table with a constant velocity by a force of 5N.When the push is increased to 9N,what is a)the resultant force b)the acceleration

75. ## world regional geography

2. _______ is one of the first Latin American countries to have a separate ministry of tourism with dedicated funds within its federal governmental structure.

76. ## Calculus 2

The volume of the solid generated by revolving the region about the given line. above the curve y=3 below the curve y=sqrt of 3x on the left by the y-axis the line y=3

77. ## physics

How much work is done when a mass of 30N is lifted vertically through 6m

78. ## Ag econ

How do you prove marginal profitability of implementing precision ag practices to a farm operation.

79. ## physics

In loading a lorry a man lifts boxes each of weight 100N throughta height of 1.5 m. a)how much work does he do in lifting 1 box b)how much energy is transferred when 1 box is lifted c)if he lifts 4 boxes/minute@ what power is he working

80. ## math

what is the numeral for two million, five and three hundred fifty-one thousandths

81. ## math

In their little league baseball season, Dominick had twenty-four hits in his forty times at bat. Michael had eighteen hits in his thirty times at bat. How many more hits per at bats did Dominick have?

82. ## physics

A load of 500N is raised 0.2m by a machine in which an effort of 150N moves 1m.What is a) the work done on the load b)the work done by the effort c)the efficiency

83. ## maths

show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin theta -1)

84. ## biology

Based on what you know about phenotypes and figure 2 for the p generation what is the corn plant genotype on each cob containing the P corn kernals

85. ## biology

from the phenotype of the kernals on each P generation cob what would the predicted genotype of any F1 plant be?

86. ## maths

show that sin3theta-cos2theta =(1-sin theta)(4sin squared theta + 2sin theta -1)

87. ## mathematics

Given that A + B = 120 degrees and cosA + cos B = 1 divided by squareroot of 2,show that cos A-B divided by 2 = 1 divided by square root of 2

88. ## physics 1

a 5.00kg object placed on a frictionless horizontal table is connected to a string tat passes over a pulley and then is fastened to a hanging 9.00kg object.Find the acceleration of the two objects and the tension in the string.

89. ## maths

tan5x/4x as lim x approaches to pi

90. ## Chemistry

1. Show quantitatively how you would prepare a solution of 3.10 x 10^2 g of 0.125 molar (m) ethylene alcohol from ethylene glycol and water.

91. ## Math 209

The width of a rectangular carpet is 7 meters shorter than the length, and the diagonal is 1 meter longer than the length. What are the carpet's dimensions?

92. ## mathematics

give that sin( A + B )= 2cos(A - B ) and tan A = 1/3,Find the exact value of tanB

93. ## Chemistry

1. What amount of Potassium Chloride forms when 5.25 litres of Chloride gas at 0.95 atm and 293K reacts with 17.0g of Potassium.

94. ## English

I need to prepare different grammar tests. I really hope you can see if everything is OK. 1) Ask for the information in the bold part of the sentence. (6 pts.) 1.It usually takes him half an hour to drive to work. 2.Sandra was hurrying to school yesterday

95. ## English

I still have to include a few more exercises. Thank you very much. 1) Complete the sentences with must/mustn’t, have to/don’t have to, should/shouldn’t (9 pts.) 1) My mum is angry with me. I ................ stay in my room an study in the afternoon.

96. ## math

A building has 7 storeys. If the interior length is 41 m and the width is 32 m, What is the total floor space in the building including open spaces for stairs, etc?

97. ## Math

Solve the equaton by completing the square. 4x^2-8x-3=0

98. ## Math

Is 0 is even no?

99. ## Physics

A spring id vertically, as shown below, and a 500g mass is hung from its lower end. The EQUILIBRIUM extension of the spring is observed to be 10.0cm. (I) What is the spring constant of the spring? (II) If the is pulled down by 5.00cm and released, what is

100. ## physics

consider a solid cylinder rolling from rest down a plane inclined at an angle theta to the horizontal.After rolling down a distance s down the plane,determine (i) acceleration of the cylinder (ii) if the cylinder is hollow ; find its acceleration after a

101. ## Elementray Statistics

Assume that a population is normally distributed with a mean of 100 and a standard deviation of 20. Would a sample mean of 115 or more be considered unusual? Why or why not?

102. ## english

Will s person that is born deaf(deaf since birth) be able to speak? please provide a proof for your answer(i.e. website)

103. ## English

Here is my outline for my speech. How does it look? I know I need a better conclusion, I am just not sure exactly yet. Aggressive Driving Introduction • How many of you have turned on the news or opened a newspaper to find that another human being was

104. ## Math 221

What if the size for each sample were increased to 20? Would a sample mean of 115 or more be considered unusual?

105. ## Chemistry

4. During a practical exercise, you find out that you need to adjust the pH of a strong acidic solution of volume 5.6 litres from 4.52 to 5.25 (i) What would you add, OH- or H3O+ to adjust the pH? Explain your answer. (ii) Assuming that there is a

106. ## Writing

Please help.. Did i identify all of the adverbs and adjectives in the following? I personally did not have any credit cards for a very long time. In the past, I have had more then I needed and found them only causing me problems. I was young and not very

107. ## mathematics

Show that for any p and q on the line ,the distance from p+q/2 is the same as the distance from p+q/2 to q.

108. ## mathematics

Find the equation of the smaller circle tangent to both axes and passing the point (-3,6)

109. ## mathematics

Find the equation of the parabola with the vertex at the origin and directrix y =5

110. ## maths

simplify 12-1/9 /4/3+(1/2)^2

111. ## maths

simplify -3(-9)-[-5-3]

112. ## college algebra

COMPOUNDS P=2500, r=12%, t=20yrs, n=2

113. ## Mathematics

1. Show that Sin3 Theta - Cos2 Theta = (1 - Sin Theta)(4Sin^2 Theta + 2Sin Theta - 1). Without using a calculator, show that Theta = 18 degrees is an exact solution of the equation Sin3 Theta = Cos2 Theta. Justifying your answer, find the exact values of:

114. ## Calculus

When Pal throws his beach ball straight up in the air, it's height h at time tis given by h=(-1/2)gt^2+v(sub 0). Find the velocity of the ball at time t.

115. ## Calculus

When Pal throws his beach ball straight up in the air, it's height h at time tis given by h=(-1/2)gt^2+v(sub 0). Find the velocity of the ball when t=0.

116. ## Science

TRUE or FALSE? when ice cubes melt into liquid water, its physical properties changes

117. ## Geometry

30-60-90 triangle has a hypoteneuse of 10 use trig to find the short side

118. ## maths

3. Simplify. 2y+y^2-xy-(xy-y+3y^2)

119. ## math

4. Solve . 16-2(8w-7)=3w-18(2-w)

120. ## math

can someone help me to make this a non- function. f(x){(1,-8),(3,-4),(5,0),(9,4),(10,-2)

121. ## maths

factorize (x^2-4x)(x^2-4x-1)-20

122. ## maths

factorize 2*2^1/2x^3+3*3^1/2y^3+5^1/2(5-3*6^1/2xy)

123. ## maths

if a=(3^1/2+2^1/2)/(3^1/2-2^1/2) b=(3^1/2-2^1/2)/(3^1/2+2^1/2) find a^3+b^3

124. ## maths

if x=1/(2-3^1/2) prove that x^3-2x^2-7x+5=3

125. ## maths

if x=3+8^1/2, find x^4+(1/x^4)

126. ## maths

factorize a^3+b^3+c^3-3abc

127. ## maths

if the sides of a triangleABC is 16cm,19cm and 15cm what about the angleB is it the greatest or smallest angle or is angleB = angleC or ia angleA the smallest angle? plz help