# ally

Popular questions and responses by ally
1. ## Chem

RXN #1: H2 (g) + O2 (g) --> H2O2 (l) ; delta-H =? Calculate the enthalpy change (delta-H1) for the reaction above (RXN #1) using the information below and Hess' Law. RXN A: H2O2 (l) --> H2O (l) + 1/2 O2 (g); delta-H=-98.0 kJ/mol RXN B: 2 H2 (g) + O2 --> 2

2. ## physics

In the figure the coefficient of static friction between mass (MA) and the table is 0.40, whereas the coefficient of kinetic friction is 0.28 ? part a) What minimum value of (MA) will keep the system from starting to move? part b) What value of(MA) will

3. ## Physics

A horizontal uniform bar of mass 2.6kg and length 3.0m is hung horizontally on two vertical strings. String 1 is attached to the end of the bar, and string 2 is attached a distance 0.65m from the other end. A monkey of mass 1.3kg walks from one end of the

4. ## Calc 3

Given the matrix A= a 6 5 a -8 8 7 9 a find all values of a that make |A|=0. Give your answer as a comma-separated list.

5. ## Calc 3

The region W is the cone shown below. The angle at the vertex is 2π/3, and the top is flat and at a height of 5/sqrt(3). Write the limits of integration for ∫WdV in the following coordinates (do not reduce the domain of integration by taking advantage

6. ## Trigonometry

Equation 1: (tan^2x)/(cos^2x)+sec^2x+csc^2x=sec^4x+csc^2x*cos^2x+1 Equation 2: (csc^2x*(sin^4x+cos^2x))/(cos^2x)-cos^2x = tan^2x*csc^2x+cot^2x+sin^2x-1 Equation 3: tan^2x*sin^2x - (cot^2x)/(csc^2x) = -(sin^2x*cot^2x)/(csc^2x)- cos^4x Do the following for

7. ## Trigonometry

A trajectory of a spaceship traveling from Earth to Mars can be expressed as the equation where the sun is the origin and is expressed in million mi. Earth is 151.1 million mi. from the sun, and mars is 211.7 million mi. from the sun. a. What type of polar

8. ## history

how did washington gain control of boston? he sent 16,000 troops to launch a surprise attack on the british fort protecting boston. he surrounded the harbor giving them no option other than to surrender. he strategically placed cannons overlooking the

9. ## Chemistry

Is PbI2 soluble in water or not? Following the solubility rules for ionic compounds, salts containing Pb are insoluble and iodide salts are soluble, so can it be both?

10. ## Math

The function f(x)=x^2. The graph of g(x) is f(x) translated to the right 3 units and down 3 units. What is the function rule for g(x)? I honestly have no idea how to this… An example or helping me get through the problem would be great :) Thank you so

11. ## Computer Science

You try to run the CHKDSK utility from a command prompt but you keep getting an error message that you need to run it in Elevated Mode. How do you correct this? Reboot the computer in SAFE Mode and then run CHKDSK from a command prompt. Open command prompt

12. ## math

At a school camp, 30% of the students were boys. When 87 students left the camp after the second day, half the original number of boys were left behind, and the number of girls decreased by 20%. How many girls were at the camp in the beginning?

13. ## Math

18 students in a class play baseball. 17 students in the class play basketball. 30 students in the class play either or both sports. Select the vend diagram that shows the number of students who play basketball and baseball. A. Baseball 13 (5) 12

14. ## World History

What was an effect of the United States' entry into World War I? Britain shifted most of its troops to the eastern front because they were no longer needed in France. Tensions developed between American and French troops over who would occupy the best

15. ## chemistry

Helpful steps? Calculate the predicted atomic radius for potassium, K, given the atomic radius of rubidium, Rb, (0.247 nm) and cesium, Cs, (0.265 nm).

16. ## Calculus

Values of f(x,y) are given in the table below. Let R be the rectangle 1≤x≤1.6, 2≤y≤3.2. Find a Riemann sum which is a reasonable estimate for ∫Rf(x,y)da with Δx=0.2 and Δy=0.4. Note that the values given in the table correspond to midpoints.

17. ## Math/Piecewise functions

Write a piecewise definition for the tax due T(x) on an income of x dollars When x

18. ## Calc 3

Jessica and Matthew are running toward the point P along the straight paths that make a fixed angle of θ (Figure 1). Suppose that Matthew runs with velocity va (m/s) and Jessica with velocity vb (m/s). Let f(x,y) be the distance from Matthew to Jessica

Help Please Can u check my answers? < = my answer If you do not experience some pain from your workouts, you are probably wasting your time: A.myth < B.fact You should still watch what you eat when you are exercising, in order to maintain a healthy weight:

20. ## Chemistry

Help please: A 0.199-g sample of unknown metal (X) reacts with hydrochloric acid to produce 88.5 mL of "wet" gas at 20 °C and 754 mm Hg. What is the unknown metal (X)? (The vapor pressure of water at 20 °C is 18 mm Hg.) X(s) + 2 HCl(aq) → XCl2(aq) +

21. ## physics

The initial kinetic energy imparted to a 0.72 kg bullet is 1777 J. The acceleration of gravity is 9.81m/s2.Neglecting air resistance, ﬁnd the range of this projectile when it is ﬁred at an angle such that the range equals the maximum height attained.

22. ## Introduction to Computers

What is a limiting factor of EFS when compared to BitLocker?

23. ## psychology

Ryan was purchasing a new garden hose at Wal-Mart when he heard raised voices in the next aisle. When the cart came around the corner, he had to move quickly to dodge an exploring preschool age child followed by an “out of control” mother. The mother

24. ## Calc 3

Consider a piece of wire with uniform density. It is the quarter of a circle in the first quadrant. The circle is centered at the origin and has radius 3. Find the center of gravity (x¯,y¯) of the wire.

25. ## eng

In Ray Bradbury’s short story “A Sound of Thunder,” which of Mr. Eckels’s character traits leads to drastic consequences for the rest of the world? (1 point) his lack of curiosity his carelessness his fearfulness*** his greed

26. ## MATH

A contractor purchases gravel one cubic yard at a time. (a) A gravel driveway L yards long and 6 yards wide is to be poured to a depth of 1 foot. Find a formula for n(L), the number of cubic yards of gravel the contractor buys, assuming that he buys 12

27. ## History

How did the Chinese government react to the fall of Communist Russia? A. When Soviet states withdrew from the USSR, Chinese diplomats sought to acquire Russian states located along the Chinese border. B. The Chinese government predicted that its own system

28. ## math

In certain deep parts of oceans, the pressure of sea water, P , in pounds per square foot, at a depth of d feet below the surface, is given by the following equation: P=12+8d/9 If a scientific team uses special equipment to measures the pressure under

29. ## physics

suppose a treadmill has an average acceleration of 4.7 x 10^-3 m/s^2. a. how much does its speed change after 5.0 min? b. if the treadmill's initial speed is 1.7 m/s, what will its final speed be?

30. ## Math/Probability

Anna and bob play a game in which Anna begins by rolling a fair dice, after which bob tosses a fair coin. They take turns until one of them wins. Anna wins when she rolls a 6. Bob wins when the coin lands on heads. What is the probability that Anna will

31. ## Calc 3

Let S be the square in the xy-plane, oriented with the normal pointing in the positive z-direction. Estimate ∬S F⋅dS where F is a vector field whose values at the labeled points are F(A)=⟨9,3,5⟩, F(C)=⟨9,8,−4⟩, F(B)=⟨−9,8,−7⟩,

32. ## english

In the poem "I will pronounce your name" the speaker uses sensory details to appeal to all of the following senses except: A. hearing B. sight C. smell D. touch Please help thank you!

33. ## Chem

Determine the boiling point of a sol'n containing 96.8 g MgBr2 in 2014 g of water.

34. ## Math

450 children take part in an art competition if there are 25% more boys than girls how many more boys than girls are there

35. ## Social Studies

What were some influences on self-government? Select all that apply. Commentaries on the laws of England** The Columbian exchange English bill of rights Poor Richard's almanac**

36. ## Math

A carpenter is assigned the job of expanding a rectangular deck where the width is one-fourth the length. The length of the deck is to be expanded by 10 feet, and the width by 6 feet. If the area of the new rectangular deck is 128 ft^2 larger than the area

37. ## Chemistry

How many nonbonding electron pairs are in an oxygen molecule? I drew it but im unsure if Im correct in saying it has 2 nonbonding electron pairs.

1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water

39. ## Math

The legs of an isosceles triangle measures 2x^4+2x-1 units. The perimeter of the triangle is 5x^4-2x^3+x-3 units. Write a polynomial that represents the measure of the base of the triangle.

40. ## Chem

which of the following statements is true regarding electromagnetic radiation? Options: 1. electromagnetic radiation with a wavelength of 600 nm travels faster than that with a wavelength of 400 nm. 2. the frequency of electromagnetic radiation determines

41. ## statistics

a company manufactures calculators in batches of 45 and claims that the rate of defects is 4%.find the probability of getting exactly 2 defects in a batch of of 45 if the rate of defects is 4%.if the store receives a batch of 45 calculators and finds that

42. ## Calc 3

Find ∫CF⋅dr where C is a circle of radius 1 in the plane x+y+z=4, centered at (3,2,−1) and oriented clockwise when viewed from the origin, if F=4yi−3xj+3(y−x)k

43. ## Math

On a California map 1/4 of an inch represents 20 miles how many miles does 3 1/4 inches represent

44. ## Science

Which reaction is exothermic? A. Cellular respiration B. Photosynthesis C. Baking soda + vinegar D. Melting Ice***

45. ## Math

The sum of four consecutive even integers is the same as the least of the integers. Find the integers. I'm not sure how to solve it and put it in an equation!

46. ## Chemistry

What volume of oxygen gas is needed to react completely with 0.677 L of carbon monoxide gas (CO) to form gaseous carbon dioxide? Assume all volume measurements are made at the same temperature and pressure. Thanks in advance for all help!!

47. ## Alegebra

N is the number of buttons in a sewing box. N is more than 40 but less than 80. When N is divided by 5 , the remainder is 2. When N is divided by 7, the remainder is 4. What is the value of N?

48. ## Physics plz help

(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the

49. ## physics

Rosie (mass 58 kg) pushes a box with a horizontal force of 170 N (38.216 lb) at a speed 16 m/min. What is Rosie’s power output? Answer in units of W

50. ## Chemistry

Determine the total number of electrons transferred in the following balanced reaction. 4 MnO4– (aq) + 12 H3O+ (aq) → 4 Mn2+ (aq) + 5 O2 (g) + 18 H2O (g)

51. ## Chemistry

If BaCO3 is placed in an evacuated flask, what partial pressure of CO2 will be present when the reaction reaches equilibrium? 298K BaCO3(s)-->BaO(s)+CO2(g)

52. ## Math

What percent of the selling price in the 14.7 cents per L tax collected by the federal government? a) 65.7 cents/L b) 73.9 cents/L The answers are a)15% and b) 14%, but how do i show my work?

53. ## Math

Use a net to find the surface area of the prism 14 inches 7 inches and 5 inches 203 406 476 540

54. ## Biochemistry

Consider the malate dehydrogenase reaction from the citric acid cycle. Given the following concentrations, calculate the free energy change for this reaction at 37.0 °C (310 K). ΔG°\' for the reaction is 29.7 kJ/mol. Assume that the reaction occurs at

55. ## Calculus

Find the volume of the largest rectangular box with edges parallel to the axes that can be inscribed in the ellipsoid x^2/64+y^2/36+z^2/1=1 Hint: By symmetry, you can restrict your attention to the first octant (where x,y,z≥0), and assume your volume has

56. ## biology

There is a large amount of catalase found in liver. Do you think that your liver breaks down more Hydrogen Peroxide in the summer or winter? Explain. -My teacher said this is a trick question and I think it neither summer or winter but I'm not sure

57. ## Calculus

Let f(x,y)=(x-1)/(2x+y). Find the domain of f.

58. ## Calc 3

Find the critical point of the function f(x,y)=2e^x−4xe^y.

59. ## Calc 3

The oracle function f(x,y) is presented below. For each point (x,y) you enter the oracle will tell you the value f(x,y). Estimate the partial derivative of the function at (1.6,−0.0999999999999999) using the Newton quotient definition.

60. ## Government

Do you generally agree or disagree with Colin Woodard's theory regarding political culture in America? Why or why not?

61. ## language arts

in “concrete mixers “ what seems to be the speakers feelings about the concrete mixers ?

62. ## science

Which of the following would increase the effect of tides on Earth (high tides get higher, low tides get lower) - slowing the rate of rotation of the Moon. - increasing the rate of rotation of the Moon. *** - decreasing the distance between the Earth

63. ## Chemistry

A 99.99% pure, 0.4903 g sample containing only carbon, hydrogen, and nitrogen is subjected to combustion analysis, resulting in the formation of 1.373 g CO2, 0.2791 g H2O, and 0.1860 g NO. What is the empirical formula of the sample?

64. ## Geometry

Two unit squares share the same center. The overlapping region of the two squares is an octagon with perimeter 3.5. What is the area of the octagon? I don't know how to do this. Could you please help me?

65. ## History

Why did Adams increase the size of the American navy? A)He wanted to prepare for all-out war on Britain. B He hoped it would deter more attacks by French ships.*** C)He needed to use tax money to fund an increase in military spending. D)Congress passed a

66. ## Language

which sentence has proper subject-verb agreement? even my cousin steve feel sad today. even my cousin steve look sad today. even my cousin steve feels sad today.*** even my cousin steve looking sad today.

67. ## La

which of the following sentences includes a predicate pronoun? justin and meg are the winners of the contest. the winners of the contest are they. the winners of the contest are justin and meg. the winners of the contest are excited.***

68. ## Social Studies!

What policy did President Washington follow during the period of war in Europe following the French Revolution? A. He remained neutral toward all European powers to avoid conflict*** B. He acted to promote democracy across Europe C. He promised to fight

69. ## Chemistry

A buffer system contains 0.30 M NH4+ and 0.15 M NH3. pKa of NH4+ is 9.25. How many moles of NaOH must be added to 1.00 L of this solution to increase the pH to 9.25? Hint: What is the (NH3) / (NH4+) when the pH=pKa?

70. ## Alegebra

The smallest regulation golf ball has a surface area of 8.86 square inches. If the diameter of the ball were increased by 10%, what will the surface area of the golf ball be?

71. ## Math

Two and four hundred eight ten-thousandths

72. ## Question About my Essay

Hi again, I was wondering about a paragraph in my Informal Essay & wasn't sure if what I had used was correct. Which of the following sentences is correct for an essay??? 1) According to matadornetwork (dot) com, we should have plenty of new pieces of

73. ## AP Chemistry

For the reaction NH3+? O2 →? NO+? H2O , what is the maximum amount of NO (30.0061 g/mol) which could be formed from 3.79 g of NH3 (17.0305 g/mol) and 18.63 g of O2 (31.9988 g/mol)? Answer in units of g -My first thought was to balance the equation, but I

74. ## Math

Remove the xy-term by rotation of axes, reduce the resulting equation to standard form and trace the curve on the new axes: 13x^2-10xy+13y^2=72

75. ## geometry

What is the cross section of a cylinder if it's cut perpendicular to the base? It's either a rectangle or a circle but I'm not sure.

76. ## chemistry

Can aluminum (Al) react with K2SO4 by single replacement to yield products? Using the activity series chart, I know that K is more reactive than Al so does that mean that a reaction will occur or not?

77. ## chemistry

how many molecules are in 5.5 moles of oxygen gas? How many atoms are in this quantity of gas? I used dimensional analysis and did: 5.5 mol. of oxygen x 6.02x10^23 molecules/1 mol of oxygen I got 3.3x^24 molecules of oxygen How do I find the # of atoms? I

78. ## chemistry

What volume of oxygen gas can be collected at 1.26 atm pressure and 2.00◦C when 39.7 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆/MnO2 −−−−→ 2 KCl(s) + 3 O2(g) Answer in units of L.

79. ## ela

I have to write a sentence with a polysyndenton sentence structure; is this an example of one? ex: I was stressed because the teacher inundated me with many projects and homework and classwork and materials

80. ## Chemistry

I need help calculating Heat of fusion for a calorimeter experiment: I know that Q(melt): 8350.46 J, m(ice): 26.39g and m(hot water): 51.93g. Please help me set it up. Hf known is 6.02kj/mol. Answer is in J/g(ice).

81. ## Calculus

In First principles there is usually a part that states as lim approaches 0. Now I came across a question where the limit was as 1 approaches 3. what should I do?

82. ## Calculus

A circular oilspill is spreading such that the radius is increasing at 0.5 metres per minute. Find the rate of increase of the are of the oil spill when the radius is 10m.

83. ## Calculus

a meteorite slams into the earths crust and penetrates d=(1200t-36000t^2)m in t seconds after impact. What is the maximum depth of penetration?

84. ## Calculus

a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be enclosed with 1000m fencing?

85. ## Calculus 1

a rectangular storage area is to be constructed along the sides of a tall building. A security fence is required along the three remaining sides of the area. What is the maximum area that can be enclosed with 1000m fencing?

86. ## science

Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A) fossilization. B) respiration. C) digestion. D) photosynthesis

87. ## Rounding

I was doing a math question and I got the answer "\$37,482.43" but the question says to round to the nearest dollar. What would the answer be then?

88. ## English

'Self-portrait'. Describe yourself. In your description you should try to capture what makes you unique. Write about 350-500 words.

89. ## Math - Functions

The research department in a company that manufactures AM/FM clock radios established the following cost, and revenue functions: R(x) = x(50-1.25x) C(x) = 160 + 10x where 0 < x < 20. a) Determine when R = C (to the nearest thousand units. e.g. 6.247)

90. ## Math - Compounding

Find the value of \$15,000 at the end of one year if it is invested in an account that has an interest rate of 4.50% and is compounded: a) monthly b) daily (assuming a 365-day year) c) quarterly What is the formula that should be used for these 3? I just

91. ## Science :check my answers

Here are some questions I had for hw, I answered some of them, can someone check my answers and help me with the ones i didn't answer, thanks: 1.Which constellations are visible from Canada in all seasons? My Answer:Ursa Major, Ursa Minor, Lynx,Cephus,

92. ## geometry

A tower casts a shadow of 64 feet. A 6 foot tall pole near the tower casts a shadow 8 feet long. How tall is the tower?

93. ## Math

In a geometric sequence, the fourth term is -4, and the eighth term is -324. What is the tenth term?

94. ## Math

The cake perimeter is 72 inches. The length is 2 times the width, what is the area of the cake?

95. ## Chemistry....help

If 0.500L of dry N2 was bubbles into an inverted flask through water to saturate it at 25.0C, what would be the total volume at the lab atmospheric pressure. Our pressure was : 757.5 mmHg

96. ## Health Science

What is the pulse deficit if an apical pulse is 112 and the radial pulse is 88?

97. ## college physics 44

An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 14km/h .Precisely 2.50s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30m/s^2 , how much time passes before

98. ## chemistry hw help please ASAP

if 25.2 g of aluminum (AW=27.0) are mixed with 125 g of sulfuric acid(MM=98.1)then how many grams of aluminum sulfate will be produced? 2Al+ 3 H2SO4 --> 3H2 + Al2(SO4)3

99. ## chemm

A scuba diver's tank contains .25 kg of oxygen compressed into a volume of 4.3 L (for oxygen, 32g = 1 mole) Calculate the gas pressure inside the tank at 9 degrees Celsius