# Questions Asked onMarch 23, 2014

1. ## Chemistry

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction 2NO(g) + O2(g) --> 2NO2(g) the standard change in Gibbs free energy is ΔG° = -69.0 kJ/mol. What is ΔG for this reaction at 298 K when

2. ## Physics

You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass m is fired into a block of mass M. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal

3. ## chemistry

Calculate the concentration in % (m/m) of a solution containing 20.5 g of LiF dissolved in 340.0 g of H2O. a.1.14% (m/m) b.5.69% (m/m) c.6.03% (m/m) d.6.42% (m/m)

4. ## physics

A runner is moving at a constant speed of 8.00 m/s around a circular track. If the distance from the runner to the center of the track is 28.2 m, what is the centripetal acceleration of the runner?

5. ## social studies

Which statement is most clearly subjective? A. In my view, the data support the professor’s assertions. B. My common sense tells me that money is the root of all evil. C. Wars are fought over ideas, land, and resources. D. It has been suggested that Nero

6. ## Chemistry

When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) Delta G^o = 290.3 kJ/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous.

7. ## physics

Assuming the Earth's magnetic field averages about 0.50×10−4 T near Earth's surface, estimate the total energy stored in this field in the first 15km above Earth's surface. The radius of Earth is 6380 km.

8. ## chemistry

1. When performing this experiment, a student mistakenly used impure KHP to standardize the NaOH solution. If the impurity is neither acidic nor basic, will the percent by mass of acetic acid in the vinegar solution determined by the student be too high or

9. ## science

im stuck on this problem fill in the blank To solve the problem of a polluted stream a scientist traced where the pollution came from.She determines=d that the pollution was coming from many small sources.she worked on a plan to help reduce the pollution

10. ## College Chemistry

A solution is saturated in both nitrogen gas and sodium iodide at 50 degrees C . When the solution is cooled to 25 degrees C what is most likely to occur?

11. ## material balance

In a process for concentrating 1000kg of freshly extracted orange juice containing 12.5 wt% solids, the juice is strained, yielding 800kg of strained juice and 200kg of pulpy juice.the strained juice is concentrated in a vacuum evaporator to give an

Ms Farnum was hired for a new job at a salary of \$62,500 and was promised a 5% raise each year. What would Ms.Farnum's salary be, to the nearest dollar, after working there for 6 years?

13. ## Chemistry

How to use the octet rule to predict the formula of the simplest compound formed from hydrogen and selenium, (Write the formula with hydrogens)?

14. ## social studies

Which statement is most likely to be supported by objective data? A. In infancy, the color blue is associated with boys, and pink is associated with girls. B. When in doubt, punt; when certain, go for the goal on the fourth down. C. In my view, the

15. ## social studies

With respect to dealing with abstract concepts, which statement is most accurate? A. Emotions have no place in any kind of academic essay. B. An essay dealing with abstract concepts can appeal to intellectual curiosity. C. An essay dealing with abstract

16. ## algebra 2

you deposit \$3500 in an account that earns 2.5% annual interest. Find the balance after one year if the interest is compounded with the given frequency.

17. ## physics

Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help

18. ## Chemistry

if a glass of ice water is at equilibrium, what is its temperature?

19. ## physics

train car are coupled together by being bumped into one another. suppose two loaded train cars are moving toward one another, the first having a mass of 150000 kg and velocity of 0.30 m/sand the second havin a mass of 110000 kg and a velocity of (-0.12

20. ## physics

52.(52G) A 110-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15 m the floor is frictionless, and for the next 15 m the coefficient of friction is 0.30. What is the final speed of the crate?

21. ## math

maren walks 3/5 miles in24 minutes at a steady pace. how long does it take her to walk 2 miles

22. ## chemistry

Consider the titration of 50.0 mL of 0.200 M HOCl by 0.200 M KOH for the next five questions (Ka for HOCl = 3.5 x 10-8). Calculate the pH after 150.0 mL of KOH has been added.

Find the common ratio, r, for the geometric sequence that has a1= 100 and a8= 25/32

24. ## physics

A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in the publishing business is a point, defined as 1/72 inch. What is an area of

25. ## trigonometry

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground

26. ## Math

the directions for lemonade say to put 2 cups of liquid concentrate into one gallon of water. if olivia only wants to make one pint of lemonade, how many fluid ounces of concentrate should she put?

27. ## physics

Two charged bodies exert a force of 0.225 N on each other. If they are moved so that they are one-third as far apart, what force is exerted?

28. ## physics

during a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him the ball mass is 10.0 kg and ball velocity is 8 m/s while the performer mass is 65 kg. if the performer is on nearly friction-less roller skates, what is his

29. ## Physics

A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?

30. ## Chemistry

What is the total heat evolved when a saturated solution of boric acid (H3BO3) in water is cooled from 100C to 20C? Note the specific heat capacity of the saturated solution is approximately that of water in that temperature range (4.20 J/g.K) and the

31. ## Physics

Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 540 V? (b) What

32. ## AP Chemistry

What is the entropy change for the vapor- ization of 2.2 mol H2O(ℓ) at 100◦C and 1 atm? H = 40700 J/mol.

33. ## Chemistry for health science

Considering the neutralization reaction when nitric acid reacts with solid iron(II)carbonate. What is the minimum volume of 2.00 M HNO3 necessary to react completely with 1.06 kg of solid iron(II) carbonate, FeCO3 ?

34. ## College Math

show that the quadrilateral with vertices at the following points is a parallelogram and find its area. a = (5,2,0), b = (2,6,1), c = (2,4,7), d = (5,0,6)

35. ## physics

The micrometer (1 μm) is often called the micron. (a) How many microns make up 1.5 km? (b) How many centimeters equal 1.5 μm? (c) How many microns are in 1.5 yd?

36. ## physics

Hydraulic engineers in the United States often use, as a units of volume of water, the acre-foot, defined as the volume of water that will cover 1 acre (where 1 acre = 43560 ft2) of land to a depth of 1 ft. A severe thunderstorm dumped 2.6 in. of rain in

37. ## physics

A light bulb is placed 16.6 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 5.40 cm closer to the mirror. Calculate the focal length of the concave mirror. i know that for

38. ## Statistics

The following is a list of 13 measurements: -38,-89,-47,-43,-70,59,92,97,23,-11,-62,-22,-5. Suppose that these measurements are respectively labeled X1,X2,...,X13 Find the sum when i=1 Xi/30.

39. ## Biochem

If .1ml of serum, 5ml of reagent and 4.9ml of distilled water are mixed together what is the dilution of the serum in the final solution

40. ## chemistry

In which of the following pairs of ionic compounds are both members of the pair soluble in water? a.AgNO3 and AgCl b.LiOH and Li2SO4 c.PbSO4 and BaCO3 d.NH4I and Sn3(PO4)2

41. ## Statistics

A random sample of 90 observations produced a mean that = 25.9 and a standard deviation s =2.4 (a)Find a 95% confidence interval for u (b)Find a 90% confidence interval for u (c)Find a 99% confidence interval for u (Use integers or decimals for any number

42. ## Chemistry

What factors control the bond length in a covalent bond? Select all that apply. -It involves the attraction between the two nuclei involved in the bond. -It involves the attraction between the electrons in the bond and the nuclei of the atoms. -It involves

43. ## Physics

consider a toy car that you pullback to make it go forward. Is it a force multiplier or a distance multiplier? Defend your answer with the observations you could make

44. ## social studies

With respect to the principles of academic freedom, which statement is most accurate? A. Truth precedes beauty. B. Every lie contains a hidden truth. C. Ultimate truth is ever illusive. D. Truth is an abstract noun. My answer is D.

45. ## Physics

Starting with an initial speed of 5.00 m/s at a height of 0.335 m, a 1.75-kg ball swings downward and strikes a 4.40-kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.75-kg

46. ## economics

Consider a market in which consumption of the good being traded generates a positive externality. There are 100 identical consumers, each with a utility function given by 1/2 √q+m+√G, where G denotes the total level of consumption in the market. The

47. ## chemistry

A piece of magnesium weighing 48 grams is burned in air n 80 gram of magnesium oxide is formed. what mass of oxygen combined with the magnesium is in the reaction?

48. ## math word problems

Package A weighs half as much as Package B. Package B weighs four times as much as Package C. The total weight of Package A and Package C is 648 grams. Find the weight of Package B.

49. ## Calculus

Suppose you have a hot cup of coffee in a room where the temp is 45 Celcius. Let y(t) represent the temp. of coffee as a function of the number of minutes t that have passed since the coffee was poured a) write a differential equation that applies to

50. ## Trig

The number of values in the interval –π ≤ x ≤ π that satisfy the equation sin x = 2 cos x is 1 2 3 4 0

51. ## physics

consider a toy car that you pullback to make it go forward. Is it a force multiplier or a distance multiplier? Defend your answer with the observations you could make

53. ## Physics

if you throw a 0.2 kg ball straight up at 8 m/s how high will it go

54. ## Plays

Can a dramatic scene about a conflict in the story have just two characters?

55. ## Math

How do you solve this by substitution? x=6y+2 3x-18y=4 This is the answer I get: 3(6y+2)-18y=4 18y+6-18y=4 18y+1818y+6-18y+18y=4 36y=10 36 36 Y=5/18 3x-18(5/18) =4 3x-5+5= 4+5 3x= 9 3 3 X=3 (3, 5/18)

56. ## Calculus

Find the slope of the tangent line to the ellipse x^2/4 + y^2/16= 1 at the point (x,y)

57. ## World Geography

Founded in 1967, ASEAN did little to foster economic cooperation until proposed a free-trade area in 1991

58. ## physics

A particle moves along a straight line such that its position is defined by s = (t3 – 3 t2 + 2 ) m. Determine the velocity of the particle when t = 4 s.

59. ## science

Copper carbonate decomposes though heat to form copper oxide and carbon dioxide. Write the equation both in words and chemical symbols.

Inventory cost at Tech Co. is 35 percent per year. What is the per unit inventory cost for an MP3 player sold at \$50? Assume that the margin corresponds to the retailer's average margin.

61. ## computer science

a) What is the largest positive number that can be represented in 12 bits using one’s complement? Represent the number in bits and decimal as well. Assume the first bit is the sign bit. (2 marks)

62. ## trigonometry

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground

63. ## soc studies 3 questions pls help!!!

8. Which of the resolutions at Seneca Falls Convention was most inspired by women’s inability to own property? (1 point) desire for improved education in order to understand property contracts belief that women should have voting rights in order to

64. ## Math

show that the quadrilateral with vertices at the following points is a parallelogram and find its area. a = (5,2,0), b = (2,6,1), c = (2,4,7), d = (5,0,6)

65. ## Algebra

How to solve y = -0.04x^2 + 1.3x + 56 using the quadratic formula?

66. ## math

If a new home can be constructed for \$160,000, what is the opportunity cost of federal defense spending, measured in terms of private housing? (Assume a defense budget of \$700 billion.)

67. ## algebra

Let g(x) be reflection of f(x)=3x+2 in the x - axis. What is a function rule for g (x)?

68. ## physic30

A charged glass rod is brought close to an insulated metal rod. The rod is momentarily grounded and then the ground is removed. This method of charging is called charging by ______? There is 3 ways; by friction, by conduction, and by induction. I think is

69. ## Math - Quadratics & Analytical Geometry

I have a test tomorrow with a few sample questions that are expected to be on the test that I do not know how to properly do. 1)Find the slope intercept equation of the line passing through the intersection of the lines 2x-4y=1 & 3x+4y=4 and parallel to

I have a test tomorrow with a few sample questions that are expected to be on the test that I do not know how to properly do. 1)Find the slope intercept equation of the line passing through the intersection of the lines 2x-4y=1 & 3x+4y=4 and parallel to

71. ## trig

Suppose that Magnus' blood pressure can be modeled by the following function {{{p(t)=83-18sin(71pi*t)}}} Magnus' blood pressure increases each time his heart beats, and it decreases as his heart rests in between beats. In this equation, p(t)is the blood

72. ## English

1. I will visit my uncle tomorrow. 2. I visit my uncle tomorrow. 3. I am visiting my uncle tomorrow. ---------------- Are they all grammatical? Does #2 mean #1 in meaning? Are #2 and #3 grammatical? Are they all the same in meaning?

73. ## math

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground

75. ## Chemistry

What factors control the bond length in a covalent bond

76. ## Math

Bella keeps a supply of red, blue, and black pens in a drawer. The drawer has 14 red pens, 18 blue pens, and 10 black pens. If Bella wants a red pen, what is the minimum number of pens she has to pull out from the drawer to make sure she gets a red pen?

77. ## math

Round 75.36 to the nearest unit I think the answer is 75

78. ## Math

The perimeter of a rectangle is 46 cm. One side is 9 cm longer than the other side. Find the lengths of the sides.

79. ## statistics

5. Suppose a manufacturer of computer chips is experiencing an average of 2% defective chips. (a) If a lot contains 1000 chips, what is the probability that more than 25 chips are defective? HINT. Use the normal approximation to the binomial.

80. ## economics

Consider the problem of a rational consumer with an experienced utility function given by 8√x+m. Let p=\$1 p/unit denote the market price of good x. Suppose that, initially, the firm selling the good matches his purchases as follows: for every x units

81. ## Gr 10 math - finding slopes in shapes

Is the slope 3/4 the same as -3/-4? In other words, do the negatives cancel each other out and become a positive number? Thanks!

82. ## math

Justin takes three times as long to do a job as Carl does, suppose t represents the time it takes Carl to do the job. Then 3t represents the time it takes Justin. How long does it take Justin if Carl takes (a) 30 sec? (b) 90 sec? (c) 2 min?

83. ## Maths

A population of 3.5 million bacteria increases by 48800 How many bacteria are there now?

84. ## Basic Spanish

My grandson need tutoring in basic Spanish to improve translate from Spanish to English in writing assignments, &grammar . Do you have review , similar to Khanacademy ? He needs tutoring to improve basic Spanish , has no tutoring in his school. Thank you

85. ## physics

A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it

86. ## chemistry

In an experiment of hydrogen reacts with 110.0 g nitrogen gas, producing 100.1 g ammonia. a) How many grams of nitrogen will be left over?

87. ## mathematics

-(x-4)(x-1)+5(3x-1)(2x+1) expand and simplify

find a rectangular contains at least 231 cubic inches.the height of the box must be exactly 1/4th of the width of the box. the box is closed on all 6 sides. the surface area of the box minimized.?

89. ## Dramatic Scene

When writing a script for a dramatic scene, are the characters listed horizontally or vertically?

90. ## math

Anthony went to the store to buy soda. There was a sign that said, "15% off." The soda eas priced at \$2.99 How much did the soda cost Anthony? If Anthony paid with a ten dollar bill, how much change did he receive?

91. ## probability math question

a bag contanins 7 red marbles, 2 blue marbles, and 1 green marble. What is the probabilty of choosing a marble that is not blue?

92. ## Plays

When I'm writing the list of characters in a dramatic scene, are the names of the characters capitalized?

93. ## Algebra

Hello, This one as well. Thank you! Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -8x^2 + 3x + 9.

94. ## Plays

Are character descriptions such as the one below indented? [MARY looks nervous. She grabs her handbag and slowly leaves the house.]

95. ## math

If f(x)=2x-1 and g(x)=x^2-x find : 1. g(g(x)) 2. g(f(x)) 3. f(g(x)) 4. f(f(x))

96. ## physics

A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it

97. ## Acne

Where is my post? Did someone remove it? :( :(

98. ## calculus

Suppose that a particle moves along a line so that its velocity v at time t is given by this piecewise function: v(t)=5t if 0≤t

99. ## physics

if you throw a 0.2 kg ball strait up at 8 m/s how high will it go

100. ## statistics

(12) Suppose N – 60,000, n =15,000, and s =50 (a) compute the standard error of mean (x) using the finite population correction factor (b) Repeat part a assuming n =30,000 (c)Repeat part a assuming n = 60,000 (d)Compare parts (a), (b), and (c), and

101. ## Statistics

)The random sample shown below was selected from a normal distribution Complete parts (a) and (b). Construct a 99% confidence interval for the population mean u. Round to two decimal places as needed.

102. ## physics

a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration

103. ## physics

A bicyclist wants to make it from one building to the next. The first building he is standing on is 20 m tall. The building he wants to reach is 12 m tall. He is moving at 4 m/s and the gap between both buildings is 5 m. Will he make it? Please just show

104. ## scholarship essay excerpt

can someone edit this. It has to be short because my entire essay has to fit onto one sheet of paper. Sophomore year served as difficult as Freshman year,as my father’s disintegrating health following my mother’s death neglected to provide me a grace

105. ## mathematics

(x+3)(x+6)-2(x+1) Expand and simplify.

106. ## Algebra II

2c+6d=14 1/2c-3d=8

ok so im lost in my essay i don't know what to do i can't find one that i like i cahnged my subtopic to how the maycomb disease influenced the arrest, testimony, and verdict in Tom Robinsons trial. but when it comes to writing the body paragraph im lost

108. ## MATH HELP!!

3c-7d=-3 2c+6d=-34

109. ## Ethical Dilemmas/Criminal Justice

which statement about hypothetical imperatives is true?

110. ## math word problems

A black pole 3 yd 2 ft long was 2 ft longer than a white pole. When part of the black pole was cut away, it was 1 yd 1 ft shorter than the white pole. How much of the white pole was cut away?

111. ## Biomechanics

Flexion of the elbow and supination of the forearm occur about what axes respectively?

112. ## Physics

explain the input energy and out put energies of two kitchen machines

113. ## Math

If 1/3 of. My salary is in one bank, 1/5 in another and 1/6 in another how much I have left

ok can you check what i have on my essay

115. ## Calcules

A company is selling 1 gallon blocks of orange juice. your task is to design a rectangle box ( prism) that meet all the criteria below: a) contains at least 231 cubic inches. b)the height of the box must be exactly 1/4th of the width of the box. c)the box

116. ## math

A company is selling 1 gallon blocks of orange juice. your task is to design a rectangle box ( prism) that meet all the criteria below: a) contains at least 231 cubic inches. b)the height of the box must be exactly 1/4th of the width of the box. c)the box

117. ## Physics

A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air.

118. ## Social Studies

What is a quota system?

119. ## English

If I wanted to describe the setting of a basketball court after a game, what are some things I might say?

120. ## Physics

A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air. What would be the total distance traveled?

121. ## Algebra

Hello, I hope all is well. I am hoping you can help. Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -7x^2 + 6x + 3.

122. ## sociology

1. In 2012, a wage earner was considered to be living in poverty if his or her annual wages were any amount below (Points : 1) \$10,000,\$13,000,\$17,000,\$23,000

123. ## Math

two angles are complementary. Twice one angle plus the other is 96'. Find the measure of each angle.

124. ## Chemistry

explain equilibrium in terms of the collision theory

125. ## Global History

Vietnam was not originally what France primarily wanted. Explain the value of Vietnam at the time. The time period is around the Vietnam war!

126. ## Algebra

x+y^2=5 2x^2+y^2=6 Solve by elimination.

127. ## signals and systems

Ts=0.18, H(s)=3/s+3 ,find hI[n],HI[e^jw},hs[n]

128. ## Math

Two angles are complementary. Twice one angle plus the other is 96. Find the measure of each angle.

129. ## math

Solve by substitution: x-y=3 x+3y=6 This is what I get: X+3y=6 Y=x-3 X(x-3)=6 2x= 9 2 2 X= 9/2 9/2+3y=6 9/2-9/2+3y= 6-9/2 3y/3= 3/2/3 Y= ½

130. ## Algebra

Solve the system of equations y=-2(x^2-1) y=2(x^4-2x^2 +1)

131. ## maths

A plane takes off from a nearby airfield and climbs at an angle of 25° to the horizontal, at 220km/h along its flight path for 45 minutes. how far does it go

132. ## physics

From t = 0 to t = 3 min 25 seconds, a man stands still, and from t = 3 min 25 seconds to t = 7 mins 35 s, he walks briskly in a straight line at a constant speed of 1.65 m/s. What is the magnitude of his average velocity vavg over this entire time

133. ## physics

What are the principles behind seatbelts and air bags that make passengers safer in a collision?

134. ## physics

explain the input energy and out put energies of two kitchen machines

135. ## Exposition: How-to Essay (Writeacher)

I have been assigned to write a 3-paragraph how-to essay. Should I number each paragraph? If not, why?

136. ## Math

Does -7x^2+6x+3 have two real-number solutions?

137. ## social studies

"terracotta was a significant part of bengal ancient time"-explaion

138. ## math

Solve by elimination 5x+y=2 3x+y=1 This is what I got : 3(5x+y=2) -5(3x+y=1) 15x+3y=6 -15x-5y=-5 -2y=1 2 2 Y=1/2 15x+3(1/2)=6 15x+3/2 =6 15x/15= 9/2 /15 X=3/10

Atticus influencing Scout can my subtopic be strict, respect for all people, and actions

x^2 sqrt(x)

141. ## Plays

If a character mentions a person who is not a character in the play, is that name capitalized? For example: JOHN. I have to give the apples to Jennifer. Should Jennifer be capitalized even if she is not in the play?