Tuesday

January 17, 2017
Total # Posts: 3,775

**Chem 22**

3.5 cm of Mg ribbon(0.009729 g/cm0 reacts with HCL to produce 32.6 ml. of Hydrogengas at 750 mm Hg and 20 degree C. the vapor pressure of water at 20 degree C is 17.5 mm Hg. Calculate the molar volume of hydrogen (L/mole) and the percent error in your determination

*July 23, 2012*

**Chem 22**

3.5 cm of Mg ribbon(0.009729 g/cm0 reacts with HCL to produce 32.6 ml. of Hydrogengas at 750 mm Hg and 20 degree C. the vapor pressure of water at 20 degree C is 17.5 mm Hg. Calculate the molar volume of hydrogen (L/mole) and the percent error in your determination

*July 23, 2012*

**Chem 22**

2.00 grams of hydrocarbon warmed 150.0 ml. water from 25.0 degree C to 30.0 degree C. Calculate the heat of hydrocarbon in K/g. the specific heat of water is 4.184 J/g. degree C

*July 23, 2012*

**PED212**

Reflect on how your perceptions of physical education have changed based on your understanding of its evolution.

*July 19, 2012*

**chemistry**

Thanks Dr. Bob! :D You're the best!

*July 18, 2012*

**chemistry**

I will give an "illustration" as to how I found it. ============ll ll ll========= ll ll ll@ ll ll========= ll ============ll. All the parallel lines illustrate the hot water bag and how it was folded. The "@" is to represent the earphones hidden in the ...

*July 18, 2012*

**chemistry**

Hello, this question is purely out of curiosity, please help to enlighten me. A hot water bag (one of those rubber ones with the rubber stopper at the top you screw in) was hidden under my bed for about a month. It was filled with a bit of water and folded in half during this ...

*July 18, 2012*

**maths**

You deposit $10,000 in an account earning 4% interest compounded monthly. a. How much will you have in the account in 25 years? b. How much interest will you earn?

*July 18, 2012*

**math**

Suppose you are looking to buy a $5000 face value 26-week T-bill. If you want to earn at least 1% interest, what is the most you should pay for the T-bill?

*July 18, 2012*

**maths**

Ten blackberry plants started growing in my yard. Absent constraint, blackberries will spread by 200% a month. My yard can only sustain about 50 plants. Using the logistic growth model, a. Write a recursive formula for the number of blackberry plants in my yard b. Calculate ...

*July 18, 2012*

**Human Services**

program design component for Habitat for Humanity where can I find information about this?

*July 16, 2012*

**math**

If two fair dice are rolled, find the odds in favor of getting doubles

*July 15, 2012*

**Math**

The surface area of any shape is expressed in: A. square units. B. cubic units. C. feet and inches. D. length and width.

*July 14, 2012*

**Math**

A circle is measured by a straight line across its widest part. This line is the __________ of the circle. A. area B. radius C. volume D. diameter

*July 14, 2012*

**Math**

I got B 4.545

*July 14, 2012*

**Math**

Divide: 100/22 = A. 5.011 B. 4.545 C. 4.98 D. 4.345

*July 14, 2012*

**Math**

Convert the mixed number, 1 3/4 , to a fraction. Reduce fraction if necessary. A. 4/12 B. 4/7 C. 7/4 D. 12/4

*July 14, 2012*

**Math**

Thank you Bob :)

*July 14, 2012*

**Math**

What is the volume of a cylinder with the following dimensions: Radius 6ft Height 24ft A. 33.14 ft3 B. 2712.96 ft2 C. 2712.96 ft3 D. 33.14 ft2

*July 14, 2012*

**Math**

Reduce the fraction 20/100. A. 4/20 B. 2/20 C. 1/5 D. 5

*July 14, 2012*

**Case Study**

Gladys strengths includes her desire to see help concerning the spousal abuse she receives at the hands of her husband and the fear she has for her children

*July 2, 2012*

**intermeidate algebra**

solve using elimination method -3x+4y=1, -6x+6y=-3

*June 29, 2012*

**Algebra**

2a+3b-c+(a-b-c)-(2a-4b+3c)

*June 28, 2012*

**physics**

1. A yacht is tacking into the wind on a zigzag path. On the rst leg of the course, the yacht has a displacement of 12 km at 840 north of east. After a second leg has been completed, the yacht's resultant displacement is 10 miles at 230 west of south. Determine the ...

*June 27, 2012*

**English**

Here's my issue with A. Connor waited in line is one complete sentence. Ava parked the car is another complete sentence. "While" is used as a conjuction here - not as a preposition.

*June 26, 2012*

**Math**

find the perimeter and area of a right triangle if the shortest side is 9 inches and the longest side is 41 inches

*June 26, 2012*

**math**

A recreation room has the following dimensions. Carpeting will cost $1.50 per square foot. How many square feet of carpet will be needed and how much will it cost?15 ft, 33 ft, 12 ft, 12 ft.

*June 26, 2012*

**chemistry**

Titration of 50.00 mL of 0.0521 M sodium oxalate, Na2C2O4, required 38.71 mL of a potassium permanganate solution: 5 C2O42- + 2MnO4- + 16H+ = 2Mn2+ + 10 CO2 + 8H2O Calculate the molarity of the potassium permanganate solution.

*June 23, 2012*

**chemistry**

A 0.8378 g sample of calcium oxalate is heated to 1000oC, CaC2O4 = CaO + CO + CO2 Calculate (a) the moles of CaO remaining after ignition (b) the mmoles of CO evolved (c) the weight of CO2 produced.

*June 23, 2012*

**chemistry HELP!**

How much of a 0.10 M H2SO4 solution is required to neutralise 1g of NaOH? Express your answer in cm3.

*June 23, 2012*

**math**

how do you do 16.1 divided by .023 ?

*June 20, 2012*

**social studies**

Between 1935 and 1957, a period that included World War II, the birth rate rose from 16.9 to 25 per 1000 people. What was the most likely cause of this "baby boom?" A) the change in view toward artificial birth control methods B) the return of young American soldiers...

*June 18, 2012*

**Algebr 1B**

Simplify if possible x^2+17x/x^2-9x+x^2-10x/x^2-9x

*June 10, 2012*

**literature**

In the call of the wild,what did Buck dream about by the campfire?

*June 6, 2012*

**History**

That is wrong! it is not C

*June 6, 2012*

**Math**

I know that 35 divided by 7 equals 5, knowing this how does it help me to find 42 divided by 7? Explain

*June 5, 2012*

**Math**

I know the answer I just need to know how to explain it!

*June 5, 2012*

**Math**

How could knowing that 35 divided by 7 equals 5 help me find 42 divided by 7?

*June 5, 2012*

**Chemistry**

A sample of methane gas at room temperature has a pressure of 1.50 atm and a volumne of 10.5 L. If the temperature is kept constant, what will be the new volume if the pressure is increased to 2.00 atm?

*June 3, 2012*

**Chemistry**

a basketgball is inflated to a pressure of 1,50 atm in a 20.c garage. What is the pressure of the basketball outside whre the temperature is -5.00 C?

*June 3, 2012*

**fractions**

I need a fraction example using 1024 x 768. It is for building a web page. So I guess the fractions would be 1024/1 x 768/1 .Any help would be great. The 1024 and 768 is what size monitor the screen is

*May 31, 2012*

**world geography**

japan

*May 30, 2012*

**10th grade chemistry**

What is the oxidizing agent during discharge

*May 29, 2012*

**algebra**

Add 12/5 and 8/13. Fractions show how it is done please.

*May 28, 2012*

**methods and analysis of quantitative research**

The graduate selection committee wants to select the top 10% of applicants. On a standardized test with a mean of 500 and a standard deviation of 100, what would be the cutoff score for selecting the top 10% of applicants, assuming that the standardized test is normally ...

*May 26, 2012*

**Physics**

Two cubic blocks are in contact, resting on a frictionless horizontal surface. The block on the left has a mass of mL = 6.70 kg, and the block on the right has a mass of mR = 18.4 kg. A force of magnitude 112 N is applied to the left face of the left block, toward the right ...

*May 25, 2012*

**writing**

how could bad therapeutic communication affects a patients outcome?

*May 24, 2012*

**Reimbursement Methodologies**

Your're a coder who's reviewing the record of a 62-year-old woman who was admitted to the hospital with shorness of breath and minor ches pain. The doctor diagnosed the patient with Staphylococcus aureus pneumonia and you assigned a code of 482.41. Additionally, you ...

*May 21, 2012*

**Statistics**

A researcher found a sample proportion of 0.94 for estimating the population proportion of freshmen at a university who had Facebook accounts. If the standard deviation of the sampling distribution of the sampling proportion is 0.02, what is a 95% confidence interval for the ...

*May 18, 2012*

**Statistics**

From random sample of 200 college students, 40 students indicated that they smoke cigarettes. Use the information from the sample to calculate a 95% confidence interval for the population proportion of college students that smoke cigarettes (round to nearest hundredth). A. (0....

*May 18, 2012*

**Statistics**

1000 scientists create 95% confidence intervals for parameters of interest. If they all compute the confidence intervals correctly, how many of the intervals would we expect to contain the true population parameter? A. 950 B. 0 C. 95 D. 1000

*May 18, 2012*

**Statistics**

Which of the following statements best describes the uncertainty associated with a 95% confidence interval for a population proportion, computed from a simple random sample? A. We don't know whether the particular confidence interval is successful or not, but 95% of ...

*May 18, 2012*

**Statistics**

A Gallup Poll reported the percentage of Americans who approve of the President's job performance was 47% with a margin of error of 2 percentage points. What is a 95% confidence interval for the population percentage? A. 41% to 53% B. 45% to 49% C. 46% to 48% D. 43% to 51%

*May 18, 2012*

**Statistics**

In a poll of 1,000 adults, 57% believed that there was too much inappropriate content on TV. A 95% confidence interval for the proportion is given as 0.54 to 0.60. What is the margin of error of this poll? A. 0.54 B. 0.015 C 0.03 D. 0.57

*May 18, 2012*

**Math equation**

I have no idea how to solve this. f(x)=3x-4 a) f(10) b) f (-2) c) f (0) d) (b)

*May 17, 2012*

**chemistry**

How many moles of H2 would be formed from 30 grams of Na in the following (UNBALANCED) equation? Na + H2O → NaOH + H2

*May 17, 2012*

**Human Services**

develop at least one process evaluation measure and at least one outcome evaluation measure that you suggest for the Consultation and Education department at Greenby Community Mental Health Center to display the program’s effectiveness and efficiency.What issues and ...

*May 15, 2012*

**Math**

Sales tax on nonfoor items is 7%. Which equaation shows relationship of the price of item p to the total cost c? p=1.07c c=1.07p p=7c c=7p Why is this the correct one?

*May 9, 2012*

**Physics**

A flywheel of a radius .5 m starts from rest and under goes a uniform angular acceleration of 3 rad/sec2 for a period of 5 seconds. Find the angular velocity of the flywheel at the end of this time? Find the angular displacement (in radians) that the wheel turns through during...

*May 9, 2012*

**math**

A=1/2bh=1/2 (b)(b+4) 22.5=1/2 (b2+4b) 45=b2+4b b2+4b-45=0 (b-5)(b+9)=0 b-5=0 b=5 h=b+4=5+4=9

*May 9, 2012*

**HUM111**

How do you think you can be best prepared and ensure a successful outcome when interviewing someone?

*May 7, 2012*

**Math**

A box contains 4 red cubes, 3 blue cubes, 2 green cubes, and 1 yellow cube. You pick two cubes at random, replacing each after you pick. Find the probability of each compound event.

*May 2, 2012*

**Math**

The dividend is 5600. The divisor and the quotient have a difference of 10. Write the division sentence

*May 1, 2012*

**phi 103**

false

*April 30, 2012*

**algebra**

It took a contractor 1285 hours to manufacture their first unit of an item. If the contractor expects to acheive a 92% unit learning curve, how many hours would be required to manufacture units 51-100/

*April 27, 2012*

**history**

by 1910, why had public-school enrollment reach a record high a. increased funding for scholarships b. improved conditions in the school c. higher family incomes d. passage of laws requiring attendance

*April 26, 2012*

**Trigonometry**

Do I have to solve the right side of the equation first or bring it over to the left side?

*April 25, 2012*

**Trigonometry**

Fine the complete exact value of sin x = -sqrt3/2. I'm very lost as to how to even begin this problem.

*April 25, 2012*

**computers**

powerpoint presentation assignment how will i explore the role that family and society play in the development of the individual's sense of self.

*April 23, 2012*

**History**

The roots of the Iranian hostage crisis resided in: 1. Jimmy Carter’s emphasis on human rights. 2.the Shah of Iran’s despotic regime. 3.economic inflation in the United States. 4. America’s isolationist stance in foreign affairs. I think it's either 3 or 4??

*April 23, 2012*

**Statics**

A solid, round simply supported steel shaft has a diameter of 25mm and span length of 500mm. The shaft supports a concentrated load of 3kN at midspan. Calculate the maximum deflection of the shaft.

*April 23, 2012*

**Statics**

An aluminum wire has a diameter of d in. Determine the minimum diameter D of the coil in which the wire can be wound without exceeding a bending stress of 30,000psi

*April 23, 2012*

**Algebra 2**

The angular speed of a larger pulley wheel (radius=15cm) is 50 rev./min. Find the angular speed of the smaller wheel (radius=6cm).

*April 22, 2012*

**geometry**

the volume of a cylinder is 88 m. If the radius of the cylinder is quadrupled, what will be the volume of the new cylinder in cubic meters?

*April 22, 2012*

**Chemistry**

ÄH is enthalpy

*April 21, 2012*

**Chemistry**

What is the ÄH of CF4 (carbon tetraflouride)? What is the ÄH of HF (hydrogen flouride)? Lastly, what is the ÄH of C2H4 (ethane gas)? Please help.

*April 21, 2012*

**probability**

of the 2598960 different 5 card hands possible from a deck of 52 playing cards, how many would contain all 4 tens?

*April 21, 2012*

**statistics**

yes thank you

*April 20, 2012*

**statistics**

Using the Chi-square test I am having problems when I get to the part of adding the the fractions and getting the percent that must be rounded to three decimal places. I have looked in the text and searched the internet. Can you please me

*April 20, 2012*

**Math**

The answer is some number

*April 16, 2012*

**physics**

a helicopter is ascending vertically with a speed of 5.20 m/s. at a height of 110 m above the Earth, a package is dropped from a window. how much time does it take for the package to reach the ground ? (hint: v0 for the package equals the speed of the helicopter).

*April 15, 2012*

**math**

Please explain in detail how to solve this problem: h = -16t^2 + 156t + 105

*April 14, 2012*

**math**

Please explain to work this: A rocket is launched from atop a 105-foot cliff with an initial velocity of 156ft/s. the height of the rocket above the ground at time t is given by h= -16t^2 + 156t + 105. When will the rocket hit the ground after it is launched? Round to the ...

*April 13, 2012*

**Stats**

A study of the students taking distance learning courses at a university finds that they are mostly older students not living in the university town. Choose a distance learning student at random. Let A be the event that the student is 25 years old or older and B the event that...

*April 10, 2012*

**Physics**

Thank you so much, Elena!

*April 9, 2012*

**Physics**

A large solid cylinder rolls without slipping down a 40 m long hill with a 30 degree slope. The cylinder then rolls a short distance over level ground and then off a 20 meter high sheer cliff. How far from the base of the cliff does the cylinder land? Ignore friction and air ...

*April 9, 2012*

**p**

A roller coater has a first drop of 140 meters and then enters a circular loop. Find the maximum radius of the loop such that the coaster never leaves the track at the top of the loop. Using the radius found in part 1, calculate the largest centripetal acceleration experienced...

*April 9, 2012*

**Physics**

A pool ball initially traveling 5 m/s strikes a second pool ball of identical mass in a totally elastic collision. After the collision the first ball has veered off its original path and is now traveling at 3 m/s. Find the speed and angle of each pool ball after the collision...

*April 9, 2012*

**Physics**

A bullet mass 10 g strikes a log with a mass of 25 g suspended from a 3 meter long string. The bullet lodges in the log which swings up through an angle of 30 degrees. Find the speed of the bullet just before it hit the log.

*April 9, 2012*

**algebra**

the population of a city is expected to triple every 25 years . when can the city planners expect the present population of 180 persons to double?

*April 4, 2012*

**government**

This one i am stuck between A and B i need help. Which correctly lists the three factors of production in a capitalist economy? A. land, labor, and a laissez-faire economy B. socialism, labor, and capital C. land, labor, and capital D. land, capital, and monopoly

*April 2, 2012*

**Math**

Find y^1 for the relation 2 sin (x^2y)-5x^3=3y^2. Please explain so I can work similar problems.

*April 2, 2012*

**Math**

Find the points at which the relation 3x^2-2xy+y^2=24 has a vertical or horizontal tangent line.

*April 2, 2012*

**Math**

Find two lines passing through (-1, 1)which are tangent to the ellipse x^2-4x+y^2+3=0. Please write out how to get there. Thank You.

*April 2, 2012*

**Chemistry help please**

i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

*March 31, 2012*

**Chemistry**

How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

*March 31, 2012*

**AP Science**

A 2 N and 6 N force pull on an object to the right and a 4 N force pulls to the left a 0.5 kg object. What is the net force on the object? Is the answer 4N to the right

*March 28, 2012*

**Science**

How do these rank in momentum 1 being least and the most 5 Fast car, stopped truck, slow car, Fast baseball, Fast feather I have 1. Stopped truck

*March 28, 2012*

**Science**

A 2 N and 6 N force pull on an object to the right and a 4 N force pulls to the left a 0.5 kg object. What is the net force on the object?

*March 28, 2012*