# Alan

Popular questions and responses by Alan-
## Chemistry

What is the colour of: 1. Cu+ 2. Cu2+ 3. Cu3+?

*asked on March 16, 2010* -
## physics

what is the maximum torque on a rectangular coil 5 cm x 12 cm and with 600 turns when carrying a current of 0.0700A in a uniform field with magnitude 0.300T?

*asked on August 8, 2016* -
## math

The butcher shop sells a 3 lb package of chicken legs for $9.57. The supermarket sells chicken legs for $7.68/kg. Determine the price per kilogram that each store charges. Which store has the lower price per kilogram?

*asked on January 14, 2013* -
## Language arts

1.Which of the following should be included in your research presentation? Select all that apply (2 answers) ***A.a broad topic **B.details and examples from a variety of sources C.a works cited list D.data from an atlas E.an outline 2.which of the

*asked on March 28, 2018* -
## physics

A 55-kg packing crate is pulled with constant speed across a rough floor with a rope that is at an angle of 44.7 degrees above the horizontal. If the tension in the rope is 155 N, how much work is done on the crate to move it 9.0 m? *looking for W=__J

*asked on March 15, 2011* -
## Physics

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec

*asked on October 7, 2014* -
## math

Fred has 15 cows John has twice as many cows as Fred had when Fred had as many cows as John has now how many cows has John?

*asked on September 21, 2014* -
## algebra

Mary wants to hang a mirror in her room. The mirror and frame must have an area of 7 square feet. The mirror is 2 feet wide and 3 feet long. Which quadratic equation can be used to determine the thickness of the frame, x? (4 points)

*asked on February 7, 2015* -
## chemistry

How many moles of H2O are needed to react with 15.0g of CaO forming Ca (OH)2? CaO + H2O --> Ca (OH)2

*asked on July 15, 2013* -
## Physics

A 3.00 uF and a 5.00 uF capacitor are connected in series cross a 30.0V battery. A 7.00 uF capacitor is then connected in parallel across the 3.00 uF capacitor. a)Calculate the equivalent capacitance of the circuit I think the answer is 3.33 uF.

*asked on February 16, 2010* -
## chemistry

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at

*asked on February 4, 2008* -
## Precalculus

Suppose H(X)=(6x-5)^3 Find two functions f and g such that (f•g)(x)=H(x) Neither function can be the parent/ identity function

*asked on September 27, 2017* -
## math

Lin-Yee is helping to set up a health clinic in Inuvik by collecting and shipping medical supplies from Calgary. She has found these shipping rates online: • regular rate: $2.10/lb • ship 101 to 500 lb, get a 20% discount • ship over 500 lb, get a

*asked on January 15, 2013* -
## Physics

A small plane tows a glider at constant speed and altitude. If the plane does 2.00X10^5 J of work to tow the glider 165 m and the tension in the tow rope is 2660 N, what is the angle between the tow rope and the horizontal?

*asked on March 15, 2011* -
## geometry

Rewrite the biconditional as a conditional statement and its converse and then determine if the biconditional is an accurate definition: Two angles are supplementary if and only if they form a linear pair conditional:_____________________________

*asked on October 2, 2007* -
## Algebra

Of 20 test scores, seven are less than or equal to 81. What is the percentile rank of a test score of 81?

*asked on April 2, 2020* -
## maths

Gunpowder contains 75%nitre and10% sulphur.find the amount of gunpowder which carries 9 kg nitre . what amount of gunpowder would contain 2.5kg sulphur

*asked on September 26, 2016* -
## Chemistry

Which of the following statements must be True? Check all that apply. The number of Adenines in single-stranded DNA equals the number of Thymines. The number of Guanines in single-stranded DNA equals the number of Adenines. The number of Thymines in

*asked on November 21, 2013* -
## Physics

A room has a volume of 120 m^3. An air-conditioning system is used to replace the air in the room every twenty minutes, using ducts that have a square cross ection. Assuming that air can be treated as an incompressible fluid, calculate the length of a side

*asked on March 16, 2010* -
## Phyics

A resistor has a resistance R, and a battery has an internal resistance r. When the resistor is connected across the battery, ten percent less power is dissipated in R than would be dissipated if the battery had no internal resistance. Show that the ratio

*asked on February 10, 2010* -
## Spanish

eodns These are the letters to a spanish word what does it spell?

*asked on April 30, 2009* -
## chemistry

An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at

*asked on February 2, 2008* -
## Algebra 2

Where do the following lines meet on a coordinate system? e.g. (x,y) x+3y=4 2x-y+8

*asked on October 11, 2007* -
## Math

Find the x-intercept and the y-intercept of the linear equation 3x + 4y = 12. Write each intercept as an ordered pair.

*asked on November 18, 2013* -
## math

A male moose is 2.6 m tall and 3.2 m long, with antlers that are 1.2 m across. An artist wants to carve scale models of the moose. She uses a scale factor of 1/30. a) What are the dimensions of the carvings to the nearest centimetre? b) How many carvings

*asked on January 14, 2013* -
## geometry

A cone is created from a paper circle with a 90° sector cut from it. The paper along the remaining circumference of the circle is the base of the cone. Find the radius of the base of the cone. Round to the nearest hundredth.

*asked on April 27, 2012* -
## Econ

The New York Times cost $0.15 in 1970 and $0.75 in 2000. The average wage in manufacturing was $3.23 per hour in 1970 and $14.32 in 2000. a. By what percentage did the price of a newspaper rise? b. By what percentage did the wage rise? c. In each year, how

*asked on March 16, 2012* -
## Calculus

If 27 J of work are needed to stretch a spring from 18 cm to 24 cm and 45 J are needed to stretch it from 24 cm to 30 cm, what is the natural length of the spring?

*asked on December 4, 2011* -
## physics

You raise a bucket of water from the bottom of a deep well. If your power output is 128 W, and the mass of the bucket and the water in it is 6.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.

*asked on March 15, 2011* -
## Physics

Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 2.8 kg pumpkin to a height of 1.4 m, then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the

*asked on March 15, 2011* -
## Physics

At t=0, a wave disturbance has the waveform that is shown in a figure. The wave has a velocity of 500.0 m/s to the left. What's the values for k and ω if the wave equation is to be written in the form: y(x,t)=A cos(kx±ωt+φo). What is the value for k,

*asked on February 13, 2011* -
## Geometry

What is the sum of the measures of the interior angles of a convex octagon? What is the sum of the measures of the interior angles of a convex decagon? What is the measure of one interior angle of a regular polygon with 20 sides? Thank You! (:

*asked on February 3, 2010* -
## Physics 30

An object located in front of a concave mirror with a radius of curvature of 80 cm produces an invert image that is three times the size of the object. Calculate the distance between the object and the mirror.

*asked on November 11, 2009* -
## Global History

Identify Jacobins

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

Name the property which justifies the following conclusion: given: 3q+9r conclusion: 3(q+3r)

*asked on October 3, 2007* -
## geometry

Rewrite the statement in if-then form. All equilateral triangles have three congruent sides. a. a figure has three congruent sides if and only if it is an equilateral triangle. b. a figure is an equilateral triangle if and only if it has three congruent

*asked on October 2, 2007* -
## Conics

What type of conic is represented by the polar equation? r= 1 / 4-6cos theta Ellipse Hyperbola Parabola Circle Help! Homework help needed

*asked on April 26, 2018* -
## chemistry

A 8.408 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.53 grams of CO2 and 3.849 grams of H2O are produced. In a separate experiment, the molar mass is found to be 118.1 g/mol. Determine the empirical

*asked on February 19, 2017* -
## Chemistry

What is the Net Ionic Equation for Nitric Acid and Potassium Carbonate?

*asked on October 12, 2016* -
## Chemistry

The quantity of Cl- in a water supply is determined by titrating the sample with Ag+. What mass of chloride ion is present in a 10,0g sample of the water if 20.2 ml of 0.100 M Ag+ is required to react with all the chloride in the sample?

*asked on October 12, 2016* -
## Chemistry

7. A student conducts an experiment on a different hydrate. The empty crucible is heated to a constant mass of 24.330. A sample of the unidentified hydrate is placed in the crucible, and the total mass is 31.571 g. The crucible and hydrate are heated to

*asked on September 28, 2016* -
## Geometry

The diagonals of rectangle ABCD intersect at point E. If AE=2x+5, and BD=5x+2, what is AC?

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

An amount of 25ml of a 0.8 Molar solution of pure KNO3 and placed in a volumetric flask. Is added water until the thin volume reaches exactly 500ml. which the final concentration?

*asked on January 21, 2016* -
## Physics

Three blocks are connected on the table as shown below. The coefficient of kinetic friction between the block of mass m2 and the table is 0.345. The objects have masses of m1 = 3.25 kg, m2 = 1.25 kg, and m3 = 2.50 kg, and the pulleys are frictionless. The

*asked on February 11, 2015* -
## math/set theory

120 quilts were entered into a quilt show. (Traditionally, all quilts were hand stitched but now many are stitched on machines. Appliques are additional pieces of cloth that are sewn on top of the quilt.) In this show, 86 were machine stitched. 44 had

*asked on November 13, 2014* -
## Chemistry

In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?

*asked on November 22, 2013* -
## Math

Is 10.512 * 10^3 written in proper scientific notation? If not rewrite the number in proper scientific notation.

*asked on November 14, 2013* -
## Math

Perform the indicated operation. Write your answer as a simplified fraction. 1. 1/3 + 0.25 = 7/12 2. 0.3125 - 1/4 = 1/16 3. -7/10 + 0.2 = -9/10

*asked on November 13, 2013* -
## Math

Simplify each of the following. 1. 42/48 2. -15/35 3. 119/210

*asked on November 12, 2013* -
## Math

Write as an improper fraction. 1. 7 3/5 2. -12 1/2 3. 41 4/6

*asked on November 12, 2013* -
## Math

Write as a mixed number. 1. 13/11 2. -33/6

*asked on November 12, 2013* -
## compound interest

If I invest $30000 at 10% compound interest for eighteen years how much will i get

*asked on April 27, 2012* -
## Chemistry

What amperage is required to plate out .250 mol Cr from a Cr+3 solution in a period of 8.00 h?

*asked on April 11, 2012* -
## Chemistry

In the reaction: Protection of 1-Phenylethanol by 3,4-Dihydro-2H-pyran, 1-phenylethanol, 3,4-Dihydro-2H-pyran and anhydrous ether were added first and stirred in ice-water bath before acid catalyst p-toluenesulfonic acid monohydrate was added. The reaction

*asked on September 4, 2010* -
## Chemistry

Aspirin equilibrium is : HC9H7O4(aq) + H2O (double arrow)C9H7O4^-(aq) + H3O^+ You have 2 tablets each containing 0.325g of active ingredient that you dissolve in water up to 225ml. Calculate the pH.

*asked on March 14, 2010* -
## College Algebra

Mendoza Manufacturing plans to producea one compartment vertical file by bending the long side of a 10-in. by 18-in. sheet of plastic along two lines to form a U-shape. How tall should the file be in order to maximize the volume that it can hold?

*asked on October 4, 2009* -
## Algebra Need answers ASAP

What is the factored form for a Quadratic Function with it vertex at the origin?

*asked on March 28, 2008* -
## english

this is a portion of my english homework that i cant do. i was assigned over 100 questions and these are the ones i need the most help with and i need to turn it in in like an hour so any help would be great :-) 1. Which is not a sentence fragment? A.

*asked on November 30, 2007* -
## Geometry

Which best describes the relationship between the lines with equations -16x+2y=0 and -x-8y=-2? a. neither parallel nor perpendicular b. parallel c. same line d. perpendicular

*asked on October 26, 2007* -
## geometry

Name the property which justifies the following conclusion: given: 3q+9r conclusion: 3(q+3r)

*asked on October 2, 2007* -
## geometry

Decide which one of the following statements is false. a. any three points lie on a distinct line. b. three noncollinear points determine a plane. c. a line contains at least two points. d. through any two distinct points there exists exactly one line. my

*asked on October 2, 2007* -
## Algebra

A pollster conducts a survey by phone. The probability that a call does not result in a person taking this survey is 85%. What is the probability that the pollster makes 4 calls and none result in a person taking the survey?

*asked on April 2, 2020* -
## World History

The British naval blockade of the North Sea Contributed to?

*asked on April 4, 2019* -
## Trig

For parametric equations x=a cos t And y=b sin t Describe how the values of a and b determine which comic section will be traced.

*asked on May 16, 2018* -
## science

How are white and yellow produced by the opponent process?

*asked on February 3, 2018* -
## algebra

Here are yesterday's high temperatures (in Fahrenheit) in 13 U.S. cities. 50 , 56 , 56 , 58 , 60 , 61 , 63 , 66 , 67 , 71 , 71 , 80 , 83 Notice that the temperatures are ordered from least to greatest. Give the five-number summary and the interquartile

*asked on December 11, 2017* -
## Physics, Calculus

if an aircraft flying at 250km/h at bearing N 45East for 1 hour meets a wind from the NW at 50km/h, then how long will it take to fly the full 550km maintaining its N45E bearing to the ground with this wind blowing?

*asked on June 25, 2017* -
## Math

There are 36 books on a bookcase.there are 9 nonfiction,12 fiction,and 15 science fiction. What is the probability of choosing a nonfiction book of choosing a fiction book of choosing a science fiction book?

*asked on May 20, 2017* -
## Math

2 2/4 divide by 1 1/4

*asked on April 18, 2017* -
## Chemistry

What is the concentration in each of the following solutions? A) 240 mL of 0.200 M KNO3 is added to 160 mL of water. B) 2.25g of NaCl is dissolved in 250 ml of water.

*asked on October 12, 2016* -
## Maths

-3x+2y=-6

*asked on August 22, 2016* -
## Chemistry

5 grams of H2 reacts with 16 g of O2, which in excess? 2H2(g)+O2(g)=2H2O(g)

*asked on May 21, 2016* -
## math

If the store purchases an item at a wholesale cost of $3.50 per item, and it is sold at a retail value of $5.00 per item. What is the gross profit percentage of the item?

*asked on April 20, 2016* -
## Geometry

A wheel 2ft wide rolls a distance of .015 miles in .005 hours. What is the wheels speed in rpm's?

*asked on March 31, 2016* -
## Chemistry

Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH

*asked on January 22, 2016* -
## Chemistry

An aluminum sheet used for food preservation weighs about 0.05 g/cm-2 How many electrons are in a 1 cm2 of this sheet?

*asked on January 21, 2016* -
## Math help Steve?

1) Given that p(-3), p(-1), and p(5)=0, which expression could be p(x)? A)x^3-x^2-17x-15 B)x^3+x^2-17x+15 C)x^3-3x^2-13x+15 D)x^3-9x^2+23x-15 Hi Steve, I got what you said, but how would I solve this equation then?

*asked on April 29, 2015* -
## Math

Hello again! I would appreciate help very much on this. Thank you! 1) For which values of x is y equal to 16 in the equation y=|3x+4|? A) -60 and 36 B) -36 and 60 C) -20/3 and 4 D) 20/3 and 4

*asked on April 29, 2015* -
## Math

1. Which function represents an initial population that increases 22% per year where A represents the initial value and X represents time in years? A. Y=A(0.22)^x B. Y=A(0.68)^x C. Y=A(1.22)^x D. Y=A(1.68)^x I do not get how to solve this problem. Any help

*asked on April 29, 2015* -
## Math

1) Malene rented a compact car for 10 days and drove it 620 miles for a total cost of 412$. Patrick rented a compact car at the same rental car company for 6 days and drove it 850 miles. His total cost was 295. Which system of equations could be used to

*asked on April 29, 2015* -
## Math (check answers)

1) Given that p(-3), p(-1), and p(5)=0, which expression could be p(x)? A)x^3-x^2-17x-15 B)x^3+x^2-17x+15 C)x^3-3x^2-13x+15** D)x^3-9x^2+23x-15 2) Coaches in a football conference had the option to vote for or against a rule change. The table below shows

*asked on April 29, 2015* -
## Math

1)If the roots of a quadratic equation are -2 and 3, the equation can be written as A) (x+2)(x+3) B) (x-2)(x+3)** C) (x+2)(x-2) D) (x-2)(x-3) Is the answer B? If someone could help me that would be great.

*asked on April 29, 2015* -
## Physics

A constant retarding torque of 12 N*m stops a rolling 0.80 m diameter wheel in a distance of 15 m. How much work does the torque do?

*asked on April 4, 2015* -
## History

What were the major changes in sciences view of the nature of the universe and humanity's place in it between 1850 and 1914? How did these developments contribute to the age of anxiety? How are these changes reflected in philosophy, psychoanalysis, and

*asked on December 18, 2014* -
## AP Calc

The US Post Office has a limit on the size of packages it will accept for mailing. The length plus the girth must be 84 inches or less. Find the dimensions of the rectangular package with a square end, which will maximize the volume of the package.

*asked on December 1, 2014* -
## MATH

Mimi's Market sold 24 heads of lettuce one morning. That afternoon 2/7 of the remaining heads of lettuce were sold. The number of heads left was now 1/2 of the number the market had at the beginning of the day. How many heads of lettuce were there at the

*asked on November 17, 2014* -
## Social Studies

What are some lifestyles for the following countries: -Kazakhstan -Kyrgyzstan -Latvia -Liechtenstein

*asked on October 9, 2014* -
## Physics

A ball rolling with initial velocity of 40m/s(W) undergoes an acceleration of 5.0m/s^2(N) for a period of 6.0seconds. (A) what is the final velocity of the ball? (B) what is the displacement of the ball in the 6.0 sec

*asked on October 7, 2014* -
## Maths

Mathew is attending a very loud concert by the discarded. To avoid permanent ear damage he decides to move farther from the stage. Sound intensity is given by the formula I=k/d*d where k is the constant and d is the distance in metres from the listener to

*asked on October 1, 2014* -
## Organic Chemistry

What ketone or aldehyde would be reduced to produce each alcohol, respectively: a. 3,3-Dimethyl butan-2-ol b. 3-Methyl butan-1-ol c. Benzyl alcohol

*asked on May 24, 2014* -
## ch

A 0.160-g sample of unknown metal (X) reacts with hydrochloric acid to produce 66.5 mL? Help please

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

Evaluate the expression for the given value. x = 3; y = -5; z = -2 x(yz)^2 - 3(xyz)^0 + 2x^2yz^2 = 3(-5 * -2)^2 - 3(3 * -5 * -2)^0 + 2(3)^2(-5 * -2)^2 = 3 * 100 - 3 * 30 + 2 * 9 300 - 90 + 18 = 228

*asked on November 25, 2013* -
## Math

Evaluate the expression for the given value. x = -2; y = 3; z = -1 -2x^2y - 3xy^2z - xz =

*asked on November 24, 2013* -
## Math

Solve the following: -6x + 3

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

Solve the following. 2(x + 1) - 4

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

Evaluate when x = 2, y = -5, z = 3. x^2 - y = 3 3z - 4(y + 1) - y^2 = 0 x - yz = -13

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

Simplify or solve as appropriate. Enter ns if there's no solution or all if the solution is all real numbers. 2 - 3(x + 5)) = 10 X = -7.6 7z + 6 - 2(z + 3) 5 * z 1/2x - 5 = 3/4x + 7 X = -48

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

Using the linear equation y = -3x + 5, complete the table of values (T-Chart) and choose the correct graph. X = -2 Y = _ X = -1 Y = _ X = 0 Y = _ X = 1 Y = _ X = 2 Y = _

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

Using the linear equation y = 5, answer each of the following. Choose all points that would be on this line. (0,5), (5,5), (2,5), (5,2), (-3,5), or (5,-3)

*asked on November 18, 2013* -
## Please check if these math questions are correct

8 = p - 5 Answer: p = 13 21 + y = 35 Answer: y = 14 6x = 54 Answer: x = 9

*asked on November 17, 2013*