Saturday

March 28, 2015

March 28, 2015

Total # Posts: 904

**please help Chemistry**

Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
*March 26, 2015*

**chemistry**

Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
*March 26, 2015*

**Geometry**

The area of a rectangular space is 128 square feet. What are the possible pairs of whole number dimensions in feet?
*March 25, 2015*

**Math**

a. Which values from the set {1, 2, 3,4} are solutions of (line _ this > )2x +5) Show your work? b. which values from the set {1,2,3,4} are solutions of 11 > 2x + 5? Show your work. How are your answer from parts a and b different? How can I tell the answers are ...
*March 12, 2015*

**Physics**

What is the centripetal acceleration in meters per second squared of a point on the rim of a circle with a radius of 0.45 meters and turning at a rate of 1200 rpm?
*March 12, 2015*

**Chemistry**

What is the pH of a solution prepared by mixing 500mL of 2.0M HCN (Ka= 4.9x10^-10) with 500mL of 1.0 M KOH?
*March 10, 2015*

**physics**

how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.
*March 7, 2015*

**history**

what does respective strengths mean
*March 5, 2015*

**history**

I looked and I couldn't find any I need 3 points for each side
*March 5, 2015*

**history**

what are the respective strengths of WTLC(workers) and the opponents (management) in the Winnipeg general strike? please provide full answers
*March 5, 2015*

**Computer Science**

"write a program that asks the user to enter the price of an item and rate of discount. If discount is 9%, display the final cost of item" What message do I display if its not 9%? Algorithms btw
*February 15, 2015*

**Physics**

Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)
*February 12, 2015*

**Math**

100/64= 1.5625 subtract by 1 move decimal
*February 12, 2015*

**Algebra**

Tom has a $20 bill, a $10 bill, a $5 bill, and $1 bill. List the total costs possible for items he could buy if he receives no change.
*February 1, 2015*

**061555RR**

knutson company reacquired 5,000 shares of its $15-par common stock for $13/share. the debit to treasury stock is
*January 22, 2015*

**Math**

The temperature one spring day was 78 degrees. Starting at 1:15 pm the temperature drops 0.25 degrees per minute. What temperature will it be at 1:25 pm? Do I divide 0.25/1:25 to get the answer?
*January 22, 2015*

** Math**

Raymond puts the money he inherited in an investment that earns 4.4% per year, compound semi-annually. After 12 years his investment had grown to $35,402.06. Raymond then invested the $35,403.06 at 5% per year, compound quarterly for the next 5 years.
*January 21, 2015*

**calculus **

A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the wall? Answer with 2...
*January 17, 2015*

**calculus**

i dont see it
*January 17, 2015*

**calculus **

A rectangular box has a square base with an edge length of x cm and a height of h cm. The volume of the box is given by V = x2h cm3. Find the rate at which the volume of the box is changing when the edge length of the base is 12 cm, the edge length of the base is decreasing at...
*January 17, 2015*

**calculus **

If f(x) = ι(x2 - 8)ι, how many numbers in the interval 0 ≤ x ≤ 2.5 satisfy the conclusion of the mean value theorem? (4 points) Three Two One None
*January 16, 2015*

**calculus **

The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr2. Find the instantaneous rate of change of the surface area with respect to the radius r at r = 2. (4 points)
*January 16, 2015*

**Life and world**

I need a idea of an art work response to the contemporary world it can be war violence politics or anything else im not very creative please help
*December 29, 2014*

**physics**

Save Two children hang by their hands from the same tree branch. The branch is straight, and grows from the tree trunk at an angle of 27 degrees above the horizontal. One child, with a mass of 39 kg is hanging 1.50 m along the branch from the tree trunk. The other child, with...
*November 17, 2014*

**calculus inverted cone **

A container in the shape of an inverted cone has radius 6 ft and height 12 ft. It is being drained at 2〖ft〗^3/min. Find the rate of change of the height of the liquid in the cone when the height is 3 feet. The ratio of the radius to the height remains constant.
*November 11, 2014*

**calculus**

Steve is wrong the correct answer is 10m = 1/5 rad/s and 40m = 1/8 rad/s
*November 9, 2014*

**Math**

Use inverse trigonometric functions to find a solution to the equation in the given interval. Then find solutions? cos x = -0.6 , 0<= theta <=2pi Give your answers in increasing order. Round your answers to two decimal places x = x =
*November 8, 2014*

**Math Trig Please Help!!!**

Find exact values for all the solutions to the equation cos theta = sqrt 3/2 for -2pi <= theta <= 2pi Theta = Theta = Theta = Theta =
*November 7, 2014*

**Algebra**

Thank you so much!!
*October 18, 2014*

**Algebra**

Factor (y+2)^2-81
*October 18, 2014*

**physics**

5.8kg bag of groceries is in equilibrium on an incline of 34deg. the acceleration of gravity is 9.81m/s^2. What is the magnitude of the normal force on the bag?
*October 5, 2014*

**chemistry**

When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?
*October 5, 2014*

**chemistry**

The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g) > 2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume of carbon monoxide that can be obtained from 3.39 x 102 L of methane and 1.70 x 102 L of oxygen?
*October 4, 2014*

**Statistics**

Each day a local radio station randomly draws a date (without replacement) from a bowl containing all the days in the year. The first person who calls in with their birthday on the date drawn gets a prize. what is the probability that none of the birthdays selected in the ...
*September 14, 2014*

**algebra 2**

A newspaper claims that 52% of voters will vote for a particular candidate in an upcoming election. A random survey of 1000 voters shows that 48% will vote for that candidate, with a standard deviation of 3%.
*August 1, 2014*

**mechanics**

You can take the system of calendar-magnet and you have : W1+W2-T=(m1+m2)*a=> T = 1.05 N Then, T=ì*N=>N=10.5N must be the answer you are looking for.
*July 6, 2014*

**Physics**

The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find the tension FT in the Achilles ...
*June 10, 2014*

**Physics**

What is the maximum tension possible in a 1.15 mm diameter nylon tennis racquet string? The ultimate tensile strength for nylon is 5.00×10^8N/m2.
*June 10, 2014*

**PennFoster**

when a european coffee maker becomes less expensive to buy in the united states, you could probably say that we're experiencing a
*June 9, 2014*

**science **

An object is thrown up with a velocity 30m/s. If the acceleration due to gravity is 10m/s2. Cal. I) its velocity after 2s. II) the maximum height reaches. III) the time taken for the take object to come to rest.
*June 3, 2014*

**physics**

that is what i thought
*April 14, 2014*

**physics**

A 15.4g bullet traveling at 270 m/s is fired into a 0.488kg wooden block anchored to a 100 N/m spring. How far is the spring compressed? x_{compressed} = If the speed of the bullet is not known but it is observed that the spring is compressed 43.9 cm, what was the speed of ...
*April 14, 2014*

**Algebra**

Hockey teams reciever 2points when they win and 1 point when they tie. One season, a team won a championship with 64 points. They won 11 more games than they tied. How many wins and how many ties did the team have ?
*April 13, 2014*

**Algebra**

The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 70mph?
*April 2, 2014*

**Social Studies**

Identify two problems resulting from urban sprawl in the western region of the United States. If these problems are not solved, what will the outcome likely be? Pls i really need help D:
*March 29, 2014*

**Global Studies**

What? This is my name.. But a?
*March 27, 2014*

**Global Studies**

All of the following affect climate EXCEPT a. vegetation b. elevation c. location d. wind patterns <<<
*March 27, 2014*

**Ethical Dilemmas/Criminal Justice**

which statement about hypothetical imperatives is true?
*March 23, 2014*

**statistics**

From experience, an airline knows that only 80% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that fewer than 7 of them show up.
*March 20, 2014*

**Physics**

A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J final kinetic energy ___...
*March 8, 2014*

**Physics**

A penny rests on top of a bowling ball. You give the bowling ball a slight bump and the penny slides off the frictionless, spherical surface as shown below. At what angle θ does the penny leave the surface of the bowling ball? (Hint: When the penny leaves the surface, the...
*March 8, 2014*

**math**

Five houses, next door to each other, are on the even side of the road. They are all three digit numbers and the largest is a perfect cube.The second lowest is a triangle number.
*March 3, 2014*

**Physics**

You are going to toss a rock straight up into the air by placing it on the palm of your hand(you are not gripping it) then pushing your hand up very rapidly. Draw a free body a diagram for the rock for each situation, and write the sum of equation based on the free body ...
*February 17, 2014*

**Global Studies (Please help)**

So you are saying its Colorado?
*February 3, 2014*

**Global Studies (Please help)**

What ashley?
*February 3, 2014*

**Global Studies (Please help)**

which of the following was neither part of the confederacy nor the union? a. Minnesota b. Texas c. Michigan D. Colorado
*February 3, 2014*

**Language Arts**

Which is the correct MLA citation for a magazine article? A. Brian Carson. "The Real Story Behind Bigfoot." Myths and Legends Mar. 2010:20. Print. ****** B. Carson, Brian. "The Real Story Behind Bigfoot." Myths and Legends Mar. 2010:20. Print. C. Brian ...
*February 3, 2014*

**Psychology**

What is the relative frequency of sample means above 101.5?
*February 2, 2014*

**Math**

Danny has a yard in the shape of a parallelogram: width- (50 m) length- (60 m) height- (60 m) he want to split it into 3 pieces, with more than one type of shape. they should all have equal perimeter. the perimeter can not be in decimals. (Help please)
*February 2, 2014*

**Business Math **

. Compute the rate for the following loan. Round your answer to the nearest tenth of a percent. Principal Rate (%) Time Interest $50,000 9 months $4,500 (Points : 2)
*January 5, 2014*

**Physics**

A small block slides along a track from one level to a higher level, by moving through an intermediate valley (see Figure). The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. Assume that the block's...
*December 26, 2013*

**Physics**

Place a small rubber ball on top of a basketball or soccer ball and then drop them together. If vertical alignment nicely remains as they fall to the floor, you’ll see that the small ball bounces unusually high. Can you reconcile this with energy conservation?
*December 8, 2013*

**Astronomy**

Do you do anything on your own??
*December 5, 2013*

**physics**

A 1600 kg car moves along a horizontal road at speed v0 = 13.3 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.21 and the kinetic friction coefficient is even lower, μk = 0.147. The acceleration of gravity is 9.8...
*December 3, 2013*

**Physics Classical Mechanics**

MIT x Problem cheater
*November 27, 2013*

**Physics Classical Mechanics**

this is an MIT EDX problem cheater
*November 14, 2013*

**Computer**

Suppose that you are the general manager for a major-league baseball team. During the off-season, you need to sign some free-agent players for your team. The team owner has given you a budget of $X to spend on free agents. You are allowed to spend less than $X altogether, but ...
*November 11, 2013*

**Physics (angular motion)**

The blades of a fan running at low speed turn at 230rpm . When the fan is switched to high speed, the rotation rate increases uniformly to 370rpm in 5.80s . Part A What is the magnitude of the angular acceleration of the blades? Part B How many revolutions do the blades go ...
*November 7, 2013*

**7th grade Math**

use n to stand for the number of payments and a for the amount still owed. write an equation for calculating a for any value of n
*October 29, 2013*

**Algebra**

1000(h) = 917(20+h) solve for h :/
*October 13, 2013*

**geomerty**

what form of symmetry does a equilateral triangle and a round button have?
*October 11, 2013*

**Physics**

If the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h? I tried using FB=FG but I don't get anywhere. Can anyone help me out?
*October 11, 2013*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
*October 11, 2013*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
*October 11, 2013*

**Physics**

But do I have to include He density in this equation at all?
*October 11, 2013*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N?
*October 11, 2013*

**Physics/Electricity**

An aluminum wire carrying a current of 9.0 A has a cross-sectional area of 7.0X10^-6 m2. Find the drift speed of the electrons in the wire. The density of aluminum is 2.7 g/cm3. (Assume three electrons are supplied by each atom.)
*October 6, 2013*

**Math**

Would that be 50/100?
*October 5, 2013*

**Math**

if the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h, below the surface? I have absolutely no idea where to even start.
*October 5, 2013*

**Physics**

A metal sphere is found floating in a pool. The sphere is 1m in diameter. If it is half submerged determine the weight of the sphere. You may assume the following: g=10N/kg density of Water = 1000kg/m^3 Vsphere = 4/3pir^3 I get 13.3 as my final answer, but there is no answer ...
*October 5, 2013*

**Psychology**

Aren't the variables the same though?
*October 2, 2013*

**Psychology**

So, the type of life skill program is the independent variable of this scenario? Can you please explain more as to why? The dependent variable is assessing the effectiveness of the new life skills program in promoting problem solving skills.
*October 2, 2013*

**Psychology**

Continuing... Group A gets the life skills training for 2 days. Group B meet at the same time and they plan their own activities. Group C takes part in the prison program. At the end of 12 weeks, all three groups are assessed on their ability to solve personal and ...
*October 2, 2013*

**Psychology**

What is the independent variable in this scenario: A research Psychologist is working in a federal prison and is asked to asses this new program. From 70 inmate volunteers, the psychologist randomly assigns 45 inmate volunteers to three groups: group A, group B, and group C.
*October 2, 2013*

**Geometry**

A cylindrical hockey puck is 1in high and 3in in diameter. What is its volume in cubic inches?
*September 30, 2013*

**Geometry**

Find the area of a regular pentagon with radius 5in.
*September 30, 2013*

**Geometry**

The length of each side of a rhombus is 16. The longer diagonal has length 26. Find the measures of the angles of the rhombus to the nearset degree.
*September 30, 2013*

**Geometry**

The altitude to the hypotenuse of a right triangle ABC divides the hypotenuse into 12mm and 16mm segments. Find the lengths of each of the following. A. The altitude to the hypotenuse B. The shorter leg of angle ABC C. The longer leg of angle ABC
*September 30, 2013*

**Geometry**

Find the area of each equilateral triangle. The triangle has 12cm sides. The triangle has 10in altitudes.
*September 30, 2013*

**Geometry**

The circumference of the ball of string is 415ft and it weighs 13,0000Ib. Which is the best approximation of the volume of the ball of string? F.300FT^3 G.600FT^3 H.1200FT^3 I.2400FT^3
*September 30, 2013*

**Geometry**

The circumference of the ball of string is 415ft and it weighs 13,0000Ib. what is the radius of the ball of string to the nearest tenth of a foot? A. 3.3 B. 6.6 C. 13.2 D. 20.75
*September 30, 2013*

**Geometry**

Find the missing length. MG=10cm, NP=4cm, QP= 14cm, MN=____cm
*September 29, 2013*

**Geometry**

The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the larger figure?
*September 29, 2013*

**Geometry**

A lawn chair weighs 8Ib. A child's lawn chair has dimensions exactly one half those of the larger chair. How many pounds does the child's chair weigh?
*September 29, 2013*

**Geometry**

The slan heights of two similar pyramids are in the ratio 1:5. The volume of the smaller pyramid is 60m^3. What is the volume in cubic meters of the larger pyramid?
*September 29, 2013*

**Geometry**

Two similar pyramids have laterl area 8ft^2 and 18ft^2. The volume of the smaller pyramid is 32ft^3. Find the volume of the larger pyramid.
*September 29, 2013*

**Geometry**

A regular pentagonal solid prism has 9cm base edges. A larger, similar solid prism of the same material has 36cm base edges. How does each indicated measurement for the larger prism compare to the same measurement for the smaller prism? Find the volume and weight.
*September 29, 2013*

**Geometry**

Which is the best approximation of the volume of the ball of string? A. 300ft^3 B. 600ft^3 C. 1,200ft^3 D. 2,400ft^3
*September 29, 2013*

**Geometry**

what is the radius of the ball of string to the nearest tenth of a foot? A. 3.3 B. 6.6 C. 13.2 D. 20.75
*September 29, 2013*

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