# Alan

Most popular questions and responses by Alan-
## 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* -
## Chemistry

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

*asked on March 16, 2010* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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 (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* -
## 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* -
## math

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are 6 degrees and 13 degrees, respectively. The points and the tower are in the same vertical

*asked on August 21, 2011* -
## Algebra II

A train left Podunk and traveled north at 75 Km/h. Two hours later, another train left Podunk and traveled in the same direction at 100 km/h. How many hours had the first train traveled when the second train overtook it?

*asked on October 29, 2007* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Chemistry

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

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

Consider the heterogeneous equilibrium process shown below. C(s) + CO2(g) 2 CO(g) At 700.°C, the total pressure of the system is found to be 3.87 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.

*asked on February 23, 2013* -
## 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

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* -
## 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* -
## 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 70 kg person sits on a 3.6 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.5 cm in diameter. Find the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.

*asked on May 12, 2011* -
## 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* -
## 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* -
## 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* -
## 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* -
## Chemistry

What is the molality of a solution made from 5.61 moles of KCl and 2.11 kg of water? I'm very lost on this one, could someone please help me?

*asked on May 28, 2009* -
## physics

A new record for running the stairs of the Empire State Building was set on February 3, 2003. The 86 flights, with a total of 1576 steps, was run in 9 minutes and 33 seconds. If the height gain of each step was 0.20 m, and the mass of the runner was 68 kg,

*asked on March 15, 2011* -
## chemistry lab

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* -
## 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* -
## 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* -
## 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* -
## Chemistry

Calculate the volume occupied by 18g of water vapor at 100C at 1 atm. Show calculations

*asked on December 12, 2009* -
## 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* -
## 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* -
## 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* -
## 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* -
## Physics

A 75 g autographed baseball slides off of a 1.3 m high table and strikes the floor a hori- zontal distance of 0.65 m away from the table. The acceleration of gravity is 9.81 m/s2 . What was the direction of the ball’s velocity just before it hit the

*asked on November 9, 2009* -
## physics

An inflated basketball has a gauge pressure of 9.0 lb/in^2. What is the actual pressure inside the ball?

*asked on May 12, 2011* -
## Chemistry

Does methanol absorb UV light?

*asked on September 12, 2010* -
## 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* -
## 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* -
## 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* -
## chemistry

This is my third time to ask this and no one has answered. Please help. 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

*asked on February 3, 2008* -
## 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* -
## AP PHYSICS

In a Young's double-slit experiment, the angle that locates the second-order bright fringe is 3.0°. The slit separation is 4.8 10-5 m. What is the wavelength of the light?

*asked on February 16, 2011* -
## Chemistry

Copper(I) Iodide is synthesised by the equation: 2CuSO4.5H2O + 2KI + 2Na2S2O3.5H2O --> 2CuI + K2SO4 + Na2SO4 + Na2S4O6 + 10H2O Would it make a difference if anhydrous CuSO4 and Na2S2O3 are used instead? Why hydrous CuSO4 and Na2S2O3 are used instead?

*asked on March 13, 2010* -
## 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* -
## 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* -
## 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* -
## Science Physics

A rubber ball of mass m1= 10kg is moving to the right with speed v1= 10m/s. it collides elastically with another ball of mass m2= 50kg, which is sitting at rest. m2 is larger than m1, what are the speeds of the balls, v1 and v2 after the collision?

*asked on February 3, 2011* -
## Chemistry

What is the chemical equation for: CuI + NH4OH ---> ??? This equation should oxidise Cu+ to Cu2+.

*asked on March 13, 2010* -
## 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* -
## Math

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are, and , respectively. The points and the tower are in the same vertical plane and the

*asked on August 21, 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* -
## 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* -
## 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* -
## 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* -
## World History

The British naval blockade of the North Sea Contributed to?

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

Pushing on the pump of a soap dispenser compresses a small spring. When the spring is compressed 0.55 cm, its potential energy is 0.0035 J. What is the force constant of the spring? What compression is required for the spring potential energy to equal

*asked on March 22, 2011* -
## Physics, help please!

A hypothetical spherical planet consists entirely of iron (p=7860 kg/m^3). Calclate the period of a satellite that orbits just above its surface. I started out with the pressure formula P=M/V, but i kept subbing in other formulas, but i get stuck..can

*asked on March 2, 2010* -
## geometry

Refer to the following statement: Two lines are perpendicular if and only if they intersect to form a right angle. A. Is this a biconditional statement? b. Is the statement true? this is what I put a. yes b. yes

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

Does water and methanol absorb light in the UV-Vis region?

*asked on September 11, 2010* -
## Chemistry

I recently did an experiment on Aldol Condensation, by reacting Benzaldehyde with Acetone to form Dibenzalacetone. The proposed stoichiometric ratio of Benzaldehyde:Acetone is 2:1. What would be the implications if either of the reactants is in excess?

*asked on February 12, 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* -
## physics

A 1.1 kg block is held against a spring of force constant 2.0×10^4 N/m, compressing it a distance of 0.20 m. How fast is the block moving after it is released and the spring pushes it away? v=____m/s

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

18. Which of the following is not a ramification of too much or too little status in an organization? a. it inhibits communication b. solidarity is not developed c. it interferes with work d. it causes resentment and conflict e. it causes communication

*asked on November 28, 2010* -
## Chemistry

During the preparation of K3[Al(C2O4)3].3H2O, NaOH was added slowly and with stirring over an approximately 10-minute period to a solution of Al2(SO4)3 solution. The combined solution was heated to almost boiling and left to stand for a few minutes. 1. Why

*asked on March 22, 2010* -
## 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

What was the direction of the ball’s velocity just before it hit the floor? That is, at what angle (in the range −90◦ to +90◦ relative to the horizontal directed away from the table) did the ball hit the floor? Answer in units of ◦.

*asked on November 9, 2009* -
## geometry

Write the slope intercept form of the equation of the line passing through the points (-2,4) and are perpendicular to the line y=-3x+3.

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

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

*asked on October 3, 2007* -
## 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

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

Your favorite chocolate chip cookie recipe makes 4 dozen cookies. Among the other ingredients, the recipe calls for > 1 cup of butter > 2 tsp vanilla extract > 3 cups of flour > 1/2 tsp salt You are asked to make 6 dozen cookies for a party. How much

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

Convert the following fractions to decimals. Round to 2 decimal places if necessary. 1. 1/4 2. -3 7/16 3. 25/13

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

find the rms value of the function i=15(1-e^-1/2t) from t=0 to t=4

*asked on November 20, 2011* -
## 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

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* -
## Chemistry

This is the equation for the formation of Al(OH)3: 6NaOH (aq) + Al2(SO4)3 (aq) ¨ 2Al(OH)3 (s) + 3Na2SO4 (aq) Would any side products be formed if NaOH was added quickly into Al2(SO4)3?

*asked on March 22, 2010* -
## 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* -
## 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* -
## Math

Multiply each of the following. Write your answer as a simplified fraction. 1. 4/7 * 5 = 20/7 2. 15/28 * 7/9 = 105/252 3. -3 1/5 * 7/8 = -56/20

*asked on November 13, 2013* -
## 6th grade social studies

What series of events led to the end of Egypts power in the Nile River Valley?

*asked on September 26, 2013* -
## Calculus

Find the relative extrema and absolute extrema if any. Use the first derivative test for the function f(x)=x^3-3x+2

*asked on April 17, 2012* -
## Global History

Identify Jacobins

*asked on September 28, 2009* -
## GEOMETRY AGAIN

THIS IS ANOTHER QUESTION I HAVE BEEN STUCK ON FOREVER. I THINK IT REQUIRES TOO MUCH THINKING. PHILLIP WALKED 100 YARDS TO THE EAST WHILE SHONDRA WALKED 155 YARDS TO THE SOUTHEAST. MEANWHILE, 200 YARDS TO THE NORTH, JOSE WALKED 155 YARDS TO THE WEST AND

*asked on November 20, 2007* -
## geometry

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

*asked on October 2, 2007* -
## social studies

ways and need to preserve and protect monument like konark and sanchi http://www.jiskha.com/display.cgi?id=1150207722.1150232150

*asked on September 1, 2006* -
## 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* -
## 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* -
## 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* -
## Chemistry

N-type silicon (Si) has been produced by doping with phosphorus (P). The charge-carrier population based on electrical conductivity measurments is determined to be 3.091*10^17 carriers/cm3 at room temperature. 1. Calculate the doping level of P (how much P

*asked on April 25, 2013* -
## chemistry

Determine the molarity of 30% (w/w) KOH of specific gravity 1.29. Thanks for any help.

*asked on September 10, 2007* -
## 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* -
## 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*