# Questions Asked onOctober 11, 2014

1. ## Algebra word problem

A parabolic arch has a height of 20 m and a width of 36 m at the base. If the vertex of the parabola is at the top of the arch, at which height above the base is it 18 m wide?

2. ## chemistry

An alternative approach to bomb calorimetry is toestablish the heat capacity of the calorimeter, exclusive of the water it contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and then added together. A

3. ## Physics

a car enters a 300m radius flat curve on a rainy day when the coefficient of static friction is between its tires and the road is .600. What is the maximum speed a car can travel around a curve without sliding.

4. ## Algebra

Hector’s service club is raising money by wrapping presents in the mall. The function f(x) = 3x describes the amount of money, in dollars, the club will earn for wrapping x presents. They only have enough wrapping paper to wrap 1000 presents. Describe

5. ## math

Find the percent markup based on selling price, if the percent markup based on the cost is 14%. (Round to the nearest tenth percent.)

6. ## CHEMISTRY

Write a balanced chemical equation for the reaction of solid vanadium(V)({\rm V}) oxide with hydrogen gas to form solid vanadium(III)({\rm III}) oxide and liquid water.

7. ## Chemistry

a 175.0 ml solution is made up of 20.0g of titanium(iii) chloride and H2O. What is it's molarity? I am just trying to check my work. M= 0.1296/0.175 =0.740

8. ## Math help

Order the number from least to greatest -44, -8 1/2, 0, 6.2, -12, -6.4, 14, 7, -6

9. ## Chemistry

Write the balanced molecular equation for the reaction between lithium phosphate and calcium nitrate.

10. ## statistics

A computer is used to randomly select a number between 1 and 2000. Event A is selecting 460.

11. ## Physics

A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 0.700 revolutions per second. What is the centripetal acceleration of the ball?

12. ## Physics

A puck of mass 0.165 kg, initially resting on ice, is hit by a stick to gain a speed of 32.0 m/s and then slides 25.0 m to lose 5.00% of its kinetic energy. (a) What is the work done on the puck by the stick? (b) What is the kinetic friction coefficient

13. ## statistics

A population has m = 50. What value of s would make X = 55 a central, representative score in the population?

In Langston Hughes's short story "Gumption," of which kind of narration is the following sentence an example: "'You can't live on gumption,' I said, trying to be practical”? A- third-person omniscient B- second-person C- third-person limited D-

15. ## Algebra

A person has 29 1/2 yards of material available to make doll outfits. Each outfit requires 3/4 yard of material. a: How many outfits can be made? b: How much material will be left over?

16. ## CHemistry

Assuming the final concentration of chloride anion after the addition of HCl (precipitation step) was 0.1M, what is the remaining concentration of Ag+ in the solution? (pKsp for AgCl = 9.74)

17. ## Algebra 1

A car is traveling at a rate of 80 kilometers per hour. Set up the equation that would convert the speed to meters per second. Then evaluate

18. ## Trigonometry

Find the exact solutions of the equation in the interval [0, 2π). (cos 2x) - (cos x)=0

19. ## Help

1. In addition to decreasing the amount of fat in a dish, salsa can also increase the amount of A. calories and cholesterol. B. vitamin C and fiber. C. sodium and cholesterol. D. calcium and phosphorus. B? 2. If an outdoor runner develops a headache, feels

20. ## Trigonometry

Use a double-angle formula to rewrite the expression. 6 sin x cos x

21. ## physics

The figure shows a girl and a boy each exerting a force to move a crate horizontally a distance of 13 m at a constant speed. The girl’s applied force is 75 N [22° below the horizontal]. The tension in the rope pulled by the boy is 75 N [32° above the

22. ## HELP!! Algebra

A student claims that division always makes things smaller so 5 / (1/2) cannot 10 because 10 is greater than the number 5 she started with. How do you respond? I don't understand this question at all!!

23. ## calculus

use differentials to determine by approximately how many square centimeters does the area of a square table increase if its diagonal is increased from 4 centimeters to 4.092 centimeters the question is The area of table increases by approximately (??)

24. ## Algebra 2

Juan is comparing the cell phone plans shown in the advertisement. Plan A charges a $15 monthly fee plus$0.40 per min. Plan B charges a $30 monthly fee plus$0.25 per min. For what number of minutes of use do the plans cost the same? How much will that

25. ## physics

An airplane whose speed is 150km/hr climbs from a runway at an angle of 20° above the horizontal. What is its altitude two minutes after takeoff? How many kilometers does it travel in a horizontal direction during this two minute period? Find the altitude

26. ## Algebra

the length of the longer leg of a right triangle is 13 ft more than 3 times the length of the shorter leg. the length of the hypotenuse is 14 ft more than 3 times the length of the shorter leg. Find the side lengths of the triangle

27. ## Calculus

The volume of a cube is increased from 729 cubic centimetres to 849.285 cubic centimetres Use differentials to determine : (a) by approximately how many centimetres does the side length of the cube increase? (b)by approximately how many centimetres does

28. ## science

Which of the following causes a hot air balloon to rise? Resistance Conduction Convection Radiation

29. ## Algebra

Hector’s service club is raising money by wrapping presents in the mall. The function f(x) = 3x describes the amount of money, in dollars, the club will earn for wrapping x presents. They only have enough wrapping paper to wrap 1000 presents. Describe

30. ## physics

An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go?

35. ## CHemistry

write the balanced net ionic equation that shows the formation of Fe(OH)3 in the reaction of iron (III) nitrate with sodium hydroxide. Please help

36. ## science!!

1) Which of the following correctly states the relationship between hippos and whales? (1 point) A) Whales evolved from hippos. B) Hippos evolved from whales.*** C) Hippos and whales do not share a common ancestor. D) Hippos and whales evolved from a

37. ## math

how much greater is the volume of a cube whose edge is 5 inches than the volume of a cube whose edge is 4 inches?

38. ## Physics 30

inquiry lab determining the refractive index of a variety of materials (Snell's Law Lab): Basically this lab: We us a polar coordinate paper and a semicircular shaped containers which we switch between, which are composed of different material. We shine a

39. ## English

I have to write a 5 paragraph comparison and contrast essay on Agamemnon, Hamlet, and The Love song of J. Alfred Prufrock. When writing this, do I compare all three stories at once in each paragraph as well as their differences in each of the 3 body

40. ## physics

A golfer hits a shot to a green that is elevated 3 m above the point where the ball is struck. The ball leaves the club at a speed of 13.6 m/s at an angle of 43.1° above the horizontal. It rises to its maximum height and then falls down to the green.

41. ## calculus

the surface area of a cube is increased from 24 square centimeters to 26.016 square centimeters . use differentials to determine: (1) by approximately how many centimeters does the side length of the cube increase? (2) by approximately how many cubic

42. ## AP Chemistry

1. If alum is heated at first too strongly causing it to splatter out of the crucible what effect will this have on the determination of the water hydration? 2. If alum is heated insufficiently what effect will this have on the determination of the water

43. ## Help

5. Which one of the following choices can be added to increase the "creaminess" and nutritional value of soups without adding fat? A. Creamed corn B. Pureed root vegetables C. Nonfat milk D. Cornstarch D? 7. Appetite is not linked to A. physiological

The main purpose of the rising action in a short story is to A- give background information about the characters. B- describe the highest action, or turning point, of the story. C- build interest and suspense. D- answer the reader's questions. My choice is

45. ## Help

Which best describes the conflict and resolution in "The Glass of Milk"? A- The boy is in conflict with the sailors; he resolves the conflict by leaving his ship. B- The boy is in conflict with the woman at the milk bar; he resolves the conflict by

47. ## physics

In a tennis serve, a 0.070 kg ball can be accelerated from rest to 41 m/s over a distance of 0.90 m. Find the magnitude fo the average force exerted by the racket on the ball during the serve. I know it is a force problem, but I am not even sure how to set

48. ## College Algebra

How to find the values of x,y and z and to show the condition stated below? 2yz + zx − 5xy = 2 yz − zx + 2xy = 1 yz − 2zx + 6xy = 3 Show that xyz = ±6 and find all possible values of x, y and z.

49. ## Math (Word Problem)

An open gift box is to be made from a square piece of material by cutting four-centimeter squares from the corners and turning up the sides. The volume of the finished box is to be 576 cubic centimeters. How to find the size of the original piece of

1)When evolution was first proposed, which of the following was used as evidence to support the idea? (1 point) A)observations of nature*** B)laboratory experiments C)extensive fossil collections D)genetic sequences 2)How did Darwin and Lamarck differ in

51. ## CHEMISTRY

how many grams of glucose, C6H12O6 and water are in 600g of 5.5% by mass glucose solution? please indicate the general formula to use to solve this problem.

52. ## Math

The area, a of a rectangle whos length is twice its width, w is described by the equation, a=(w)(2w)=2w^2

53. ## physics

A 78 kg bag of mortar mix is sitting in the back of a truck rounding a traffic circle of radius 27 m at a speed of 21 km/h. Using the truck's frame of reference, find the force of contact between the bag and the side of the truck. Assume that the floor at

54. ## Physics

A pilot gets into trouble flying 2000m above the pacific ovean. He flies 550 km/h [S 30(degree)W] with a wind from the NW of 100 km/h. he ejects himself at a velocity of 10m/s [upwards]. What is his velocity at the instant he hits the ocean surface?

55. ## Science

Is air a good radiator, insulator, conductor or convector of heat? If three metal spoons are on a table and each at room temperature, what will happen if they touch?

56. ## physics

A meteoroid is speeding through the atmosphere, traveling east at 15.5 km/s while descending at a rate of 10.6 km/s. What is its speed, in km/s?

57. ## chemistry

you have not added enough sodium hydroxide to precipitate all the copper as copper hydroxide. How could you tell that not all the copper had precipitated?

58. ## ap chem

an unknown gaseous hydrocarbon reacts with oxygen to form CO2 and H2O, DETERMINE HEAT OF FORMATION FOR THE HYDROCARBON. the density of the mixture of CO2 and H2O at 1 atm and 200 degree celsius is 0.751g /L and heat of reaction is equal to -2044.5 KJ /MOL

59. ## Chem lab

Student Calamity reported a final yield of 50%. List four things she might have done wrong to account for this yield. Student Overachiever reported a final yield of 115%. List two things he might have done wrong to account for this yield.

60. ## statistics

suppose that the teacher of this class graded solely on a curve - 10% get A, etc. How might this effect students getting into into study groups to prepare homework or tests?

61. ## english

in the book "passing" by Nella Larsen, how is each character trapped? I was thinking about writing how they are in a way trapped within themselves, and have internal conflicts. Would that qualify as them being trapped?

62. ## Theology 10

When have you asked to respond in faith to a situation you did not fully understand?

63. ## math

How many times do you need to multiply 6.5066 by ten to get 650.66?

64. ## Chemistry

How much heat would you need to melt 20.0 L of ice that had frozen on a fruit tree.

65. ## algebra

Determine whether the set {[1 4], [-1 6], [3 8]} is a basis of R^2

66. ## Algebra 2

solve each system of equation 3x+5y+2z=4 2x-2y+3z=-4 x+y+z=0 *could you show work because I want to learn how you got this answer

67. ## statistics

On this semesters final exam, john scored 72 on his calculus exam and 53 on his statistics exam. The z score for both exams was the same. Which on would he do better on? a. calculus b.statistics c. the exam scores are equivalent

68. ## Math College (Algebra)

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0

69. ## science

As mentioned before, our asteroid is in the shape of a sphere and has a mass of 2000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 1.2 meters.

70. ## Biology

What is the location and effect of waves of contraction in the digestive system.

71. ## statistics

Using the z table what z score would cut off the upper 25% of scores.

72. ## STATS

What percentage of the area of the standard normal distribution is between z = -1.00 and z = +1.00? How do you know this?

73. ## Algebra 2 Answer Check

Classify each system and determine the number of solutions. {3y = 2x; -4x + 6y = 3 A: inconsistent; no solution

74. ## Physics

A basketball player makes a jump shot. The 0.580-kg ball is released at a height of 1.90 m above the floor with a speed of 7.18 m/s. The ball goes through the net 3.05 m above the floor at a speed of 4.23 m/s. What is the work done on the ball by air

75. ## computer science

i need help with this problem 32+64(mod18)

76. ## English

for my homework my teacher asked us to answer this question. "How can we advance educational justice? what is the proper answer to this?

77. ## physics

Two crewmen pull a boat through a lock, as shown in Figure 5-25. One crewman pulls with a force of F1 = 155 N at an angle of θ = 32° relative to the forward direction of the raft. The second crewman, on the opposite side of the lock, pulls at an angle of

78. ## science

suppose 125g of ethanol at 25C is mixed with 255g of ethanol at 84C at constant atmospheric pressure in a thermally insulated vessel. What is the Ssys for the process. The specific heat capacity for ethanol is 2.42 J/g K. Answer in units of J/K

79. ## Math help

Noah says that dividing a number by 2 is the same as multiplying it by 1/2. He wants to know if he is right, and if so, why? How do you respond?

80. ## Goverment

I need to write a research paper relevant to the U.S. government or politics. I would like recent topics, please help.

81. ## physics

suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.25 m/s2 and the contact force has a magnitude of 2.73 N. (a) Find the mass of box 1. (b) Find the mass of box 2. So do I subtract the

82. ## chemistry

What is the percentage yield of the reaction of 4.9 g isoamyl alcohol with 4.9 g of acetic acid if 3.5 g of isoamyl acetate product is obtained after distillation? Enter your answer, without a % symbol, to 2 sig. figs.

83. ## physics

a force of 3.00 N acts through a distance of 12 m in the direction of the force. find the work done

84. ## Physics

- a 1200 W motor bike can move at a maximum speed of 30.0 m/s . how much force does the motor exert? - what would be the average momentum of 60.0 kg sprinter who finishes 100.0 m in 60 s?

85. ## Physics

Iam looking for the entire formula on how to solve this. If a person on a 35.0 m diameter Ferris wheel feels 30% heavier at the bottom of the wheel, how fast is it going around? Is N/Mg = 1 + v^2/Rg actual weight

86. ## Chemistry

Assume that you start with 2 mole(s) of magnesium metal, determine: The number of grams of MgO(s) that would be produced in the following reaction (enter your answer with 4 significant figures): Mg(s) + 1/2O2(g) → MgO(s)

87. ## Biology

How can erosion effect the carbon cycle?

88. ## math equation

a b - = - = 3, Find a + b 4 5

89. ## another math equation

a b 2 - =- =-, find ab 4 5 3 i'm gonna need supporting onthis

Solve for x in each of the following: a: 2/3x = 11/6 b: 3/4 / x = 1/3 c: 5/6 - 2/3x = 3/4 d: 2x/3 + 1/4 = x/6 - 1/2 Please help me and explain, I don't get fractions at all!

91. ## Algebra 2 (Reiny)

How am I supposed to compress f(x) = |2x| - 3 vertically by a factor of 1/4? Please, will you explain this to me?

92. ## equation

lia each take a bicycle trip. Anna rides 20 km 1 1/3 hours. Julia rides 100 meters in 10 minutes. Which rider has the slower unit rate?

tam75/2

94. ## Chemistry

Calculate the fourth ionization energy of beryllium in J atom^-1 & kJ mol^-1 units

95. ## math

20 LB for \$27.50; 12 LB for X dollars. Find x. Can you make it a decimal?

96. ## Algebra

how do you solve this problem 3 - q = 15

97. ## Chem

3Review example 5.7 and exercise 5.7. Suppose there are 2.00 moles of O2 at 1520 mmHg and 27.0 oC. Rearrange the ideal gas law and use it to determine the volume (L) of the gas. Then, find the density by rearranging the equation P(Mm) = dRT. Show all

98. ## Chem

Find the constants (a and b) for O2 in Table 5.7. Use the Van der Waals equation to determine the pressure of 1.000 mole of O2 if the gas occupies 22.50 liters at 27.00 oC. First, find the values for each of the two terms in the equation, then find the

99. ## College Algebra

Solve for x in terms of the other symbols: rsx^2 + s^2 x + rtx + st = 0

100. ## math

how to write 700+3000+40000+12+80 in standard form

101. ## College Algebra

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0

102. ## Math (Algebraic Proving)

Show that the equation sqrt((x-c)^2 + y^2)+sqrt((x+c)^2 + y^2) = 2a can be simplified to (x^2/a^2) + (y^2/b^2) = 1 where b^2 = a^2-c^2.

103. ## math

I have a 2x4 that's 8'long,how manyn 1 and 1/2 foot boards can I cut out of it?

104. ## english

in the chapter of the story of keesh what was method of those pepole to coun t age of there children?

105. ## math

in a isosceles triangle if two equal sides are 3.5 meter each.how long is third side?

106. ## Chem

Review example 5.10 and exercise 5.10. Suppose 1.58 moles of N2 and 0.420 moles of O2 occupy 22.41 L at a total pressure of 2.00 atm. Use XA = to determine the (decimal) mole fractions of both components. Then, use XA = to determine the partial pressures

107. ## Chemistry

My lab had done protein crystallography with lysozyme. Two solutions were used to prepare the crystallization: lysosome solution and the precipitate solution. 1) There was a distinct amount of starting material in a well. what would that do to the size of

108. ## physics

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle

109. ## physics

Four forces are acting on an object. Force 1 has a magnitude of 5N at an angle of 70° above the +x-axis; force 2 has a magnitude of 8N at an angle of 35° above the +x-axis; force 3 has a magnitude of 4N at an angle of 20° above the -x-axis; force 4 has

110. ## chemistry

A 300mL solution was made by dissolving 5.0g of MgCl2 in water. What is its molarity?

111. ## chemistry

how to do a research paper

112. ## physics

Assume that a particular crash test expert can withstand 18 times the acceleration due to gravity. Find the shortest distance over which her car can be brought to a stop from a speed of 78 km/h without the acceleration exceeding 18g.

113. ## Trigonometry

Find the exact solutions of the equation in the interval [0, 2π). (4 sin x)(cos x)=1

114. ## statistics

a) What is the standard deviation of the set of data? b) What raw score will have 15% of the data set above it? c) If I have a raw score of 21 what percentage of the scores, are below my score? 16, 16, 89, 76, 24, 45, 98, 20, 22, 28, 34, 35, 76, 67, 48, 37

115. ## chemistry

When a metal was exposed to light at a frequency of 3.86× 1015 s–1, electrons were emitted with a kinetic energy of 3.60× 10–19 J. What is the maximum number of electrons that could be ejected from this metal by a burst of light (at some other

116. ## research paper

s my outline for my research paper is this * abstract * introduction: includes the research question, general overview of your paper *scientific and historical perspective of your topic * two or three differing opinions relating to the topic *conclusion