Questions Asked onOctober 19, 2013

1. chem

A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.30 nm. It then gives off a photon having a wavelength of 384 nm. What is the final state of the hydrogen atom? Values for physical constants can be found here.

2. Chemistry

A mixture of C3H8 and C2H2 has a mass of 2.3g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. What is the mass of C2H2 in the original mixture?

3. Chemistry

If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the structure Y-:X:-Y could be abbreviated as XY2Z2. Classify these structures according to their shape.

4. Algebra

Triangle ABC has coordinates A(1,4) B (3, -2)C ( 4, 2). Find the coordinates of the image ABC prime after a reflection over the X - axis.

5. Ancient History

1) Along what waterway did Abraham begin his migration away from his native city? 2)how did Canaan's location make it a true crossroad of the eastern Mediterranean?

6. Math - Limits/Derivatives

Suppose that for a company manufacturing calculators, the cost, revenue, and profit equations are given by C = 70,000 + 20x R = 300x - (x^2 / 20) P = R - C where production output in 1 week is x calculators. If production is increasing at a rate of 600

7. chemistry

If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the structure Y-:X:-Y could be abbreviated as XY2Z2. Classify these structures according to their shape.

8. chemistry

4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) If a container were to have 16 molecules of NH3 and 16 molecules of O2 initially, how many total molecules (reactants plus products) would be present in the container after this reaction goes to completion? (Use

9. Geometry

Please answer at least one . PLEASE 1. Triangle XYZ has a right angle at Y. V,W are on XZ such that XV=XY. WZ=YZ, find ANGLE VYW . 2. STUVWXYZ is a regular octagon. Find SW/ TZ. 3. The interior angles of a convex polygon form an arithmetic progression with

10. Calculus

A cable hangs between two poles of equal height and 40 feet apart. At a point on the ground directly under the cable and x feet from the point on the ground halfway between the poles the height of the cable in feet is h(x)=10+(0.4)(x^1.5). The cable weighs

11. Physics

To win the game, a place kicker must kick a football from a point 40 m (43.744 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23 m/s at an angle of 30.9◦ from the

12. Chemitry

the average adult human male has a total blood volume of 5.0 L. if the concentration of sodium ion in this average individual is 0.135 M, what is the mass of sodium ion circulating in the blood

How many ways are there to put 4 balls in 3 boxes if the balls are distinguishable but the boxes are not? How many ways are there to put 4 balls in 3 boxes if two balls are indistinguishably white, two are indistinguishably black, and the boxes are

44. physics

. If the momentum of an object is tripled, its kinetic energy will change by what factor?

45. Math - Limits/Derivatives

If a price-demand equation is solved for p, then price is expressed as p = g(x) and x becomes the independent variable. In this case, it can be shown that the elasticity of demand is given by E(x) = - [g(x) / xg'(x)]. Use the given price-demand equation to

46. physics

A 5000kg truck is being pulled up a 15 degree ramp by a cable which is parallel to the surface of the ramp. If the coefficient of friction u between the wheels of the truck and the ramp is 0.100 and the truck is being pulled at a constant velocity,

47. CHEMISTRY

A garden fertilizer contains 15% by mass of nitrogen. The recommended usage is 30g of fertilizer per 10dm^3 of water. What is the concentration of nitrogen in this solution? a)0.15 g dm^-3 b)0.30 g dm^-3 c)0.45 g dm^-3 d)3.00 g dm^-3

48. Physics

A ﬁreman, 34.9 m away from a burning building, directs a stream jet of water from a ground level ﬁre hose at an angle of 44.2◦ above the horizontal. If the speed of the stream as it leaves the hose is 60.5 m/s, at what height will the stream of water

49. Chemistry

A solution of NaOH(aq) contains 5.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

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50. Statistics

The health information management department at Community Hospital will experience a 15 percent increase in the number of discharges coded per day as the result of opening a cardiac clinic in the facility. The 15 percent increase is projected to be

51. Management

ignoring history hinder young hi-tech firms?

52. Chemistry

Explain using electron-pushing arguments why glycolysis must go through G6P to F6P step (C1 aldehyde to C1 ketone). Focus on the subsequent aldolase-catalysed reaction and explain why glucose 1,6 bisphosphate would not be able to go through the aldolase

53. Water Treatment

Minimum oxygen concentration should be 7.6 mg/l, concentration in raw water is 0 mg/l and you can assume a saturation concentration of 10 mg/l. Calculate the total efficiency of oxygen addition, the number of cascade steps and the total height of the

54. us history

anti federalist 7 letters

55. Chemistry

Explain using electron-pushing arguments why glycolysis must go through G6P to F6P step (C1 aldehyde to C1 ketone). Focus on the subsequent aldolase-catalysed reaction and explain why glucose 1,6 bisphosphate would not be able to go through the aldolase

56. Statics

Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by

57. Civics

What actions were taken by the first continental congress and what actions were taken by the second continental congress in regards to colonial concerns? Please help!!!!!

58. math

Simplify the expression. 5(x − 1) − 3(x2 + 4x + 5) − 8(x + 7) Classify the answer by number of terms and degree. 1st-degree monomial 1st-degree binomial 1st-degree trinomial 2nd-degree binomial 2nd-degree trinomial

59. PHYSICS

A stone is thrown in a vertically upward direction with a velocity of 5 m s -1 . If the acceleration of the stone during its motion is 10 m s-2 in the downward direction, what will be the height attained by the stone and how much time will it take to reach

60. organic chemistry

I need help understanding how to differentiate between isomers and resonance structures in skeletal structures. Specifically, here is an image to a problem with the answers: i.imgur. com /mz3URSa.jpg (remove spaces) The left most structure is the reference

61. physics

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

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62. Probability

Rosencrantz and Guildenstern In the opening scene of Tom Stoppard's play Rosencrantz and Guildenstern Are Dead, about two Elizabethan contemporaries of Hamlet, Guildenstern flips a coin 91 times and gets a head each time. Suppose the coin was balanced. a.

63. physics

A satellite with mass 6.00*10^3 is in the equatorial plane in a circular orbit. The planet's mass = 6.59 *10^25 and a day of length is 1.6 earth days. How far from the center (in m) of the planet is the satellite? What is the escape velocity (km?sec) from

64. physics

A 710 gram block is released from a height h above an ideal spring of spring constant 400 N/m. The block sticks to the spring, and comes momentarily to rest after compressing the spring by an amount of 18.7 cm. DropOnSpring (a) What is the value of the

65. physics

A 5000kg truck is being pulled up a 15 degree ramp by a cable which is parallel to the surface of the ramp. If the coefficient of friction u between the wheels of the truck and the ramp is 0.100 and the truck is being pulled at a constant velocity,

66. A Curious Question

What do these instructions mean? "Draw a river across the land that empties into the bay. Draw at least two tributaries that feed into the river. Draw rivers that lead into both the lake in cell F-3 and the swamp in E-12."

67. physics

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire

68. Water Treatment

Based on the treatment scheme, what type(s) of raw water is / are being treated? Groundwater River water Riverbank filtrate Lake water Infiltrated river water please post answer

69. physics

Can anyone help me with the working out and answer to this one? Acetylene gas is leaking from a cylinder in the immediate vicinity of an insulated conveyor belt which has built up a charge of 30 uC (u= micro). If the conveyor belt has a capacitance of

70. physics

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

71. economics

Clearly explain the different market structure and how they determine the degree of competition among firms and how they maximise profits in the short run and long run Cite the source within the text and bibliography

72. math

-3.5,-3,-v3,1,0,2/9,v5,15.3,18 my teacher said to write which ones are natural, rational, whole, integers, irrational, & real which i understand but i don't know what she means by -v3 & v5?

73. biology

Stuck on this question. When infected by the Hepatitis B virus (HBV), many patients experience flu-like symptoms such as fever, loss of appetite, nausea, vomiting, and malaise. This is called acute hepatitis. During this stage, what is the HBV doing? What

74. physics

A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire?

75. statistics

Community Health center, a new patient clinic in your town serving only underinsured and uninsured patients, has asked you to help its health information management department get started. calculate the number of new shelving units needed for a medical

76. English

There are seven books. A series of eight movies based on the novels has been made by Warner Bros. They started making the movies in 2001. The first one was released on November 16th 2001. The second to the fifth were released respectively on 2002, 2004,

77. Math

two regular polygons of the same number of sides have sides 5 ft. and 12 ft. in length, respectively. what is the length of the side of another regular polygon of the same number of sides, if its area is equal to the sum of the other two.

78. Math

the altitude, AD, to the hypotenuse BC of right triangle ABC divides the hypotenuse into segments that are 8 and 10 cm long. find the length of the altitude.

79. Probability

Serena Williams won the 2010 Wimbledon Ladies Singles Championship. For the seven matches she played in the tournament, her total number of first serves was 379, total number of good first serves was 256, and total number of double faults was 15. a. Find

80. Water-Treatment

a) Which five quality parameters of the raw water may not meet drinking water standards? Bacterial colony count (less than 100 cfu/ml) Ammonium (less than 0.2 mg/l) Nitrite (less than 0.1 mg/l) Nitrate (less than 50 mg/l) Iron (less than 200 µg/l)

81. Chemistry

A solution of NaOH(aq) contains 5.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

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82. PHYSICS(HELP)

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

83. Trigonometry

n-1/n divided by 1+1/n

84. Water - Math Question

This question is related to water footprint calculation. I have no idea how to go about this, if anyone could point me in the right direction, I'd be forever grateful! Background info: The water footprint of the resident of a Blue Sea riparian country (92

85. Statistics

It takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1,424 discharges for the month?

86. PHYSICS

A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the

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87. physics

A car has a maximum acceleration of 4.6m/s2 . What will the maximum acceleration be if the car is towing another car of the same mass?

88. Economics

Capital- What are ten items you need to require for the production of stained glass windows when its product is finished? Please help!

89. English

Hello. I will be very grateful for your help. 1)Do you think it's possible to say: "at the end of the 19th - the beginning of the 20th centuries (maybe,century?)" or do I have to use the word "century" twice? 2)Do you think the sentence sounds OK: "It is

90. maths

by a reduction of 1kg in the price of sugar, mohan can buy one kg sugar more for Rs56 find the original price of sugar

91. Finance

You plan to saving 6,400 per year, beginning immediately. Making 4 deposits in an account that pays 5.7% interest. How much will there be in 4 years from today?

92. Math (Algebra 1)

How do I solve this problem for x? a(-3x + 1) + 4 = -30

93. physics

I am having a bit of trouble with this one. A safety harness is connected to a cable with a report breaking stress of 800MNm-2. What mass could be hung from a harness if the diameter of the cable was 6mm?

94. biology need help

3 factors the could produce bias in an experiment

95. Sports

What website would enable me to know of what cities football teams are located in?

96. math

(-4)((-6+9)-5^2)-15 answer is 73 but i'm getting a complete different answer, im following pemdas but still don't get it?

97. college history

The evolution of the socio-political and cultural milieu that created the conditions necessitating and including the formation of the: (a) Declaration of Independence (b) the Constitution (including the Bill of Rights)

98. Math 112

A student claims that if a number is divisible by 6 and 4 then the number is divisible by 24. What is your response?

99. math

7/x+5/3x=2/x-5 so lcm=3x(x-5) 21(x-5)+5(x-5)=5x 21x-105+5x-25=5x 26x-130=5x -26x to both sides -130=-21x divide each side by -21 -130/-21 x=6.19 is this correct thanks for checking my work.

100. chemistry

why is the copper/sulfur mass ratio different from the mole ratio?

101. Chemistry

How many atoms of nitrogen are in the 25.0g of ammonia? Use the molar mass to two decimal places found on the periodic table in the front of your text?

102. Ecology Intervention Project

identify a human impact and create a proposal to present to a target audience? so what are some human impacts

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103. math

I am alittle confused but I did attempt the question. How did I do? Solve 1/3y+5/12=2/y first I brought the y over to the other side.Mult both sides by 3/1 getting 5/12=6y/y 5/12=5y now divide each side by 1/5 1/12=y I this correct? If not can you lead me

104. english

D. She considers it part of her heritage. 14. What pronoun would be used for the narrator(s) of a story such as “A Rose for Emily,” which is written in the first-person, plural point of view? A. I C. We B. You D. He 15. In the dramatic point of view,

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105. English

¡°This study shows that the brain has different functional states when asleep and when awake,¡± said Maiken Nedergaard, M.D., D.M.Sc., co-director of the University of Rochester Medical Center (URMC) Center for Translational Neuromedicine and lead

106. Maths

The difference between the two roots of the quadratic equation x^2+ax+b=0 is 32 and the larger root is 3 times the smaller root. What is the value of a and b ?

107. Math

two people walk away from each other at an angle, one moving straight ahead at 6 ft per second, the other moving straight ahead at 4 ft per second. after 5 seconds, they are 24 ft apart. if they continue at the same angle and space, how far apart will they

108. Math

the sides of the triangle were given as m, (m^2/4 - 1), and (m^2/4 + 1), where m is an even number not equal to 2. prove that it is a right triangle.

109. Math

Gray bought two plots of land for a total of 120000 on the first plot she made a profit of 15% on the second plot she lost 10% .her total profit 5500, how much did she pay for each piece of land? (Please show the whole procedure of this math with the rough

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110. statics

This problem will introduce the learner into a technique called Analysis of Variance. For this course we will only conduct a simple One-Way ANOVA and touch briefly on the important elements of this technique. The One-Way ANOVA is an extension of the

111. French

The word is nusiditaco and I need it unscrambled

112. Math (Algebra 1)

Consider the ages of 5 brothers: 32, 26, 28, 30, 28. Determine which of the following are true if a new brother is adopted at age 10. A) The median will decrease B) The mean will decrease C) The range will increase D) The standard deviation will decrease

113. math

Simplify the expression. (2x − 1)(x2 + 3x − 3)

114. Sports

In city are the Miami Dolphins located?

115. math

solve 3/2x-3=5/2x-5 3(2x-5)=5(2x-3) 6x-15=10x-15 minus 6x to both sides -15=4x-15 add 15 to both sides 0=4x 0/4=4x/4 x=0 Is this correct?

116. ms. sue please answer my question

it supposed to be listed

117. math

2(2x+6)=3(3x-1) i did the work & got 3 is my answer right?

118. research

How do decision theory, probability theory, inference, and generalization relate to data analysis?

119. Quantum computers

PROBLEM 5 Suppose we ran m steps of Grover's algorithm on some function f (which has one marked element y) and the resulting superposition was exactly |y⟩. PROBLEM 5A (4 points possible) If we run for m+1 additional steps (i.e. total of 2m+1 steps from

120. A Curious Question

What would an area of the United Sates be considered as? Would it be either a state or a region?

121. MATH

JESSI bought two plots of land for a total of 120000 on the first plot she made a profit of 15%. on the second plot she lost 10% .her total profit was 5500, how much did she pay for each piece of land? ( please show the whole procedure of this math even

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122. urgent heeeelp!

Divide: -39x^4 by underroot13 multiplied by x^2

123. Math

one base of a trapezoid is 10 ft. long, the altitude is 4 ft., and the area is 32 sq. ft. find the length of a line parallel to and 1 ft. above the 10-ft. base and included between the legs of the trapezoid.

124. question

does it matter the grades of freshmen year

125. who dare to solve

Divide: -39x^4 by underroot13 multiplied by x^2 and please explain it.

126. ms. sue

i replied to my previous question

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127. Math (Algebra 1)

How do I combine the following like terms? 4+2(-x+1)-5(x-1) I have the answer - 11-7x - but I need to know how to show my work in this problem. Thanks.

128. Geography Report (Ms. Sue)

I know you told me to not post a rough draft, but I am struggling to write my first paragraph. I do not know if this even relates to the first theme of geography, which is location. Ms. Sue, please, although I haven't even complete this paragraph yet,

129. Math

1/4 x>-8 1/4 x>-8 |x-2|≤8 1≤ ((2+3x)/2)

130. Math

Write a fraction that is equal to each of the given fractions and has a numerator of one 4/5 5/7 3.15/6.3 How do I do that?

131. Sports

Does San Francisco have any foot ball or basketball teams?

132. Pre-Calculus

Determine the derivative at the point (2,−43) on the curve given by f(x)=7−7x−9x^2. I know that the answer is -43, but I was wondering if it was just a coincidence that the derivative at the point (2,−43) is -43, or is there a reason why -43 is the

133. math

-|-(5+2-4)| confused about the signs?

134. Grammar

This this grammatically correct? How much more did the United States buy than it sold in 1993? A: It bought \$115 billion's worth more than it sold in 1993?

135. crime

where can I found information on adult siblings crimes against one another

136. Biology/Chem

Soy sauce is prepared by fermenting a salted mixture of soybeans and wheat with several microorganisms including yeast over a period of 8-10 months. After the solids are removed, the resulting sauce is rich in lactic acid and ethanol. How aere these 2

137. BIO

Explain why routine blood measurement of glycated hemoglobin is used to determine whether a diabetic has good glucose control.