# ally

Popular questions and responses by ally-
## 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

*asked on July 12, 2011* -
## 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

*asked on May 8, 2012* -
## 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

*asked on May 2, 2018* -
## 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.

*asked on February 10, 2019* -
## 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

*asked on March 26, 2019* -
## 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

*asked on August 9, 2020* -
## 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

*asked on August 8, 2020* -
## 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

*asked on September 29, 2016* -
## 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?

*asked on April 17, 2015* -
## 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

*asked on January 19, 2015* -
## 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

*asked on March 12, 2015* -
## 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?

*asked on March 5, 2015* -
## 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

*asked on March 10, 2015* -
## 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

*asked on March 24, 2020* -
## 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).

*asked on April 23, 2014* -
## 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.

*asked on March 11, 2019* -
## Math/Piecewise functions

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

*asked on September 22, 2013* -
## 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

*asked on October 3, 2018* -
## Health PLEASE CHECK ANSWERS

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:

*asked on March 4, 2016* -
## 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) +

*asked on April 17, 2014* -
## 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.

*asked on February 25, 2011* -
## Introduction to Computers

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

*asked on February 23, 2015* -
## 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

*asked on July 11, 2019* -
## 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.

*asked on April 3, 2019* -
## 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

*asked on January 19, 2017* -
## 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

*asked on March 13, 2016* -
## 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

*asked on May 16, 2020* -
## 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

*asked on September 4, 2019* -
## 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?

*asked on September 3, 2010* -
## 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

*asked on May 31, 2010* -
## 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⟩,

*asked on April 16, 2019* -
## 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!

*asked on November 8, 2017* -
## Chem

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

*asked on February 23, 2017* -
## 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

*asked on October 28, 2016* -
## 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**

*asked on September 21, 2016* -
## 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

*asked on July 17, 2015* -
## 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.

*asked on April 17, 2014* -
## Science Help PLEASE!!

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

*asked on March 11, 2014* -
## 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.

*asked on March 12, 2013* -
## 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

*asked on July 13, 2010* -
## 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

*asked on December 6, 2009* -
## 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

*asked on April 23, 2019* -
## Math

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

*asked on October 16, 2016* -
## Science

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

*asked on February 24, 2016* -
## 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!

*asked on October 8, 2015* -
## 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!!

*asked on March 9, 2015* -
## 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?

*asked on June 26, 2012* -
## 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

*asked on June 25, 2012* -
## 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

*asked on February 25, 2011* -
## 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)

*asked on August 8, 2010* -
## 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)

*asked on August 2, 2010* -
## 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?

*asked on September 28, 2009* -
## Math

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

*asked on February 26, 2020* -
## 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

*asked on November 26, 2019* -
## 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

*asked on October 17, 2019* -
## 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

*asked on September 19, 2019* -
## Calculus

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

*asked on March 10, 2019* -
## Calc 3

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

*asked on February 20, 2019* -
## 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.

*asked on February 13, 2019* -
## Government

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

*asked on January 28, 2019* -
## language arts

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

*asked on January 24, 2018* -
## 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

*asked on September 23, 2017* -
## 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?

*asked on July 23, 2017* -
## 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?

*asked on January 31, 2017* -
## 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

*asked on November 15, 2016* -
## 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.

*asked on October 13, 2016* -
## 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.***

*asked on October 13, 2016* -
## 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

*asked on September 29, 2016* -
## 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?

*asked on May 10, 2016* -
## 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?

*asked on April 16, 2016* -
## Math

Two and four hundred eight ten-thousandths

*asked on April 5, 2016* -
## 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

*asked on January 27, 2016* -
## 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

*asked on September 7, 2015* -
## 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

*asked on May 18, 2015* -
## 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.

*asked on May 13, 2015* -
## 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?

*asked on April 27, 2015* -
## 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

*asked on March 11, 2015* -
## 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.

*asked on March 9, 2015* -
## 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

*asked on March 5, 2015* -
## 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).

*asked on November 19, 2014* -
## 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?

*asked on May 20, 2014* -
## 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.

*asked on May 20, 2014* -
## 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?

*asked on May 20, 2014* -
## 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?

*asked on May 20, 2014* -
## 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?

*asked on May 20, 2014* -
## 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

*asked on January 29, 2014* -
## 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?

*asked on November 3, 2013* -
## English

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

*asked on October 29, 2013* -
## 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)

*asked on September 24, 2013* -
## 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

*asked on September 22, 2013* -
## 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,

*asked on May 30, 2013* -
## 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?

*asked on February 19, 2013* -
## Math

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

*asked on December 18, 2012* -
## Math

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

*asked on November 8, 2012* -
## 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

*asked on July 3, 2012* -
## Health Science

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

*asked on April 19, 2012* -
## 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

*asked on April 15, 2012* -
## 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

*asked on November 29, 2011* -
## 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

*asked on November 2, 2010* -
## Math

How do you write 80000000 in scientific notation?

*asked on October 20, 2010*