Sunday

March 1, 2015

March 1, 2015

Total # Posts: 1,277

**Chemisty**

The value of ∆Ho for the reaction below is -1107 kJ: 2Ba(s) + O2(g) → 2BaO(s) How many kJ of heat are released when 15.75 g of Ba(s) reacts completely with oxygen to form BaO(s)? A) 35.1 B) 114 C) 70.3 D) 20.8 E) 63.5
*September 17, 2013*

**Chemisty**

Given the data in the table below, ∆Horxn for the reaction 3NO2(g) + H2O(l) → 2HNO3(aq) + 3NO(g) is __________ kJ. Substance ∆Horxn (kJ/mol) H2O(l)= -286 NO(g)= 90.0 NO2(g)= 34.0 HNO3(aq)= -207 NH3(g)= -46.0 A) -140 B) -508 C) -64 D) 140 E) 64
*September 17, 2013*

**math**

do i have to multiply something to get those answers or is it something i have to memorize
*September 11, 2013*

**math**

can some one explain to me how to convert 3 meters to centimeters. and 3 meters to millimeters. and 200 centimeters to meters
*September 11, 2013*

**college physics1**

A stone is dropped from rest from an infinitely tall building. Compute its velocity after 2 seconds
*September 10, 2013*

**I wrote answers plz check hurry**

Hello Please help
*August 27, 2013*

**Grammer Please hurry please**

1. B 2. A 3. D 4. C 5. B 6. C 7. A 8. B Is this right hurry
*August 27, 2013*

**Grammer Please hurry please**

Identify the words that correctly complete the following sentence. If none of the choices are correct, choose "none of the above." In a sentence with a compound verb, each verb (Points : 1) may have a different subject must have the same subject may not have helping ...
*August 27, 2013*

**chem**

18. What is the molecular mass of potassium hydrogen carbonate (KHCO3)? A. 116 g/mol B. 68 g/mol C. 100 g/mol D. 84 g/mol My guess would be A? I got 110.1, but that's not an option.
*August 15, 2013*

**chemistry**

17. What is the major element per mass in NaOH? A. Oxygen End of exam B. Hydrogen C. Sodium D. All elements contribute the same mass.
*August 15, 2013*

**Chemistry**

14. What is the number of moles in 42 g of NaCl? A. 1.8 mol NaCl B. 0.72 mol NaCl C. 0.61 mol NaCl D. 1.2 mol NaCl I'm sorry, I have no idea what I'm doing here.
*August 15, 2013*

**Math- averages**

Caitlyn sold 7cars per week for the first three weeks, but in week four she sold 11 cars. What is her average number of sales per week in her first four week on the job? A) 7 B) 8 C) 9 D) 11 E) 12 Please explain! Thanks!
*July 29, 2013*

**Math**

The average of a set of 7consecutivr positive intergers is 15. What is the sum of the three smallest numbers in that set? A) 38 B) 39 C) 42 D) 48 E) 51
*July 29, 2013*

**Chemistry**

1. Balance the following half reactions in basic solution. ClO3- (aq) ¨ ClO4- (aq) Zn (s) ¨ Zn2+ (aq) BrO3- (aq) ¨ Br- (aq) IO3- (aq) ¨ I2 (s) Sn2+ ¨ Sn4+
*July 26, 2013*

**operations management**

Analysis of the output of a process has suggested that the variability is nonrandom on several occasions recently. However, each time an investigation of the process has not revealed any assignable causes. What are some of the possible explanations for not finding any causes? ...
*July 22, 2013*

**Physics**

A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 10.0 kg, travels 6.50 m up the conveyor belt at a constant speed without slipping. If the conveyor belt is inclined at a 60.0° angle, calculate the work ...
*July 14, 2013*

**PE**

If 1 liter of the Pentland field formation water (see lecture power-point) is mixed with equal volume of seawater and noting that BaSO4 solubility under that condition is 2 mg/liter, how much BaSO4 precipitate would be there? (Hint: watch out for which ion is the limiting ...
*July 11, 2013*

**Physics**

At what speed must a 950 kg subcompact car be moving to have the same kinetic energy as a 3.2*10^4 kg truck going 20 km/h ?
*May 30, 2013*

**math**

Thank You!!!!!!
*May 25, 2013*

**Math **

Can anyone help me with this? The marginal cost for items in dollars is given by C''(x) = 2x + 30. If the cost of producing 2 items is $220, determine the cost function. What is the cost function? C(x)= _________________
*May 19, 2013*

**physics**

In trying to lift a heavy stone into a moving truck, a worker utilizes rope, a rug, and two long planks of wood. Identify the forces at work in making it too hard for the worker to just lift the stone on his back. HELP!!
*May 9, 2013*

**Math**

Thank you both!!
*May 8, 2013*

**Math**

So the questions was-->Factor the following algebraic equation and describe the process by which it is done: x²+ 3x – 10 = ? I solved the questions correctly but my teacher said I need to show it algebraically not arithmetically. & she said that I need to show how...
*May 8, 2013*

**math**

Steve, thanks for the formulas but I already came up with them, my teacher just wanted me to show the process in which to find the area.
*May 8, 2013*

**math**

can someone help me in finding the process in finding the area for a triangle, trapezoid, circle and rectangle
*May 8, 2013*

**Phase Changes**

The heat of fusion of water is 335 J/g, the heat of vaporization of water is 2.26 kJ/g, the specifc heat of ice is 2.05 J/deg/g, the specific heat of steam is 2.08 J/deg/g and the specific heat of liquid water is 4.184 J/deg/g. How much heat would be needed to convert 10.73 g ...
*May 8, 2013*

**Math**

I have a question that i've worked through but can't seem to figure out how to converge it to kg. A trail mix contains a 4: 7 ratio of raisins to peanuts. How many kilograms of raisins are there if there are four kilograms of peanuts in the mix? 4/7 X x/4 CROSS ...
*May 8, 2013*

**Math**

give a one-sentence definition fora polynomial equation
*May 7, 2013*

**Phase Changes**

The heat of vaporization of water is 2.26 kJ/g. How much heat is needed to change 3.74 g of water to steam?
*May 7, 2013*

**gas stoiciometry**

What volume of ammonia gas will be produced when 1.44 L of nitrogen react completely in the following equation? N2 + 3H2 = 2NH3
*May 6, 2013*

**Gas Stoichiometry **

What mass of ammonia is produced when 3.08 L of nitrogen (at STP) react completely in the following equation?
*May 6, 2013*

**chemistry **

We have a tank that contains O2 at 146 mmHg, N2 at 146 mmHg, and CO2 at 138 mmHg. We then add 135 mmHg of Ar. What is the pressure in the tank?
*May 6, 2013*

**chemistry **

We have a tank that contains O2 at 146 mmHg, N2 at 146 mmHg, and CO2 at 138 mmHg. We then add 135 mmHg of Ar. What is the pressure in the tank?
*May 5, 2013*

**chemistry**

Calculate the partial pressure of helium in a 1.00 L flask that contains equal numbers of moles of He, Ne, and Ar at a total pressure of 8.35 atm.
*May 5, 2013*

**science**

In trying to lift a heavy stone into a moving truck, a worker utilizes rope, a rug, and two long planks of wood. Identify what forces are at work in making it too hard for the worker to just lift the stone up on his back.
*May 3, 2013*

**math**

that is everything the question had...it does not have any more information
*May 3, 2013*

**math**

Ms.Sue why is it incomplete?!
*May 3, 2013*

**math**

Month J F M A M J J A S O N D TOTAL 0 0 0 0 1 21 27 16 12 2 0 0 The chart above represents the monthly rainfall in inches in Calcutta in a certain year. Calculate and explain the significance of the following measures based on this data.
*May 3, 2013*

**math**

To square 75, one can multiply (70)(80) and add 25 to that product. Can someone explain how this would work, without calculating?
*May 3, 2013*

**math**

To square 75, one can multiply (70)(80) and add 25 to that product. Can someone explain how this would work, without calculating?
*May 3, 2013*

**Math**

A trail mix contains a 4: 7 ratio of raisins to peanuts. How many kilograms of raisins are there if there are four kilograms of peanuts in the mix?
*May 2, 2013*

**maths**

what length is each side of a rhombus if its perimetre is 120cm
*April 24, 2013*

**math**

3, answer = 500 4, answer = 10 5, 382. 50
*April 16, 2013*

**math**

Graph the function f(x)=6-1/(x+4)^2 using transformations. State: a.the domain b.the range c.the asymptotes i do not get this at all, i am totally lost! please help!!!
*April 15, 2013*

**math**

a cycle company make bicycles, tricycles an unicycles. Last week they made 120 more bicycles than unicycles, and 4 times as many tricycles as unicycles. If they made 75 more bicycles than tricycles, how many unicyles did they make? I dont understand how to do this, please help
*April 10, 2013*

**Math**

A car wheel has a diameter of 0.4 meters. Work out how many full turns the wheel makes when the car travels a kilometer
*April 10, 2013*

**Algebra please help!!**

Find the number of terms in each sequence. 1. 2,-6, 18,-54,,,,,-4374 Find the common ratio r and the value of a1 using the information given. (assume r >0) 2.a3=324, a7=64 Find the indicated sum. 3. a1=2, r=-3; find s8 4. E like symbol with a 10 on top. On the bottom k=1 to...
*April 8, 2013*

**Algebra please help!!**

Find the number of terms in each sequence. 1. 2,-6, 18,-54,,,,,-4374 Find the common ratio r and the value of a1 using the information given. (assume r >0) 2.a3=324, a7=64 Find the indicated sum. 3. a1=2, r=-3; find s8 4. E like symbol with a 10 on top. On the bottom k=1 to...
*April 8, 2013*

**Algebra please help!!**

Find the number of terms in each sequence. 1. 2,-6, 18,-54,,,,,-4374 Find the common ratio r and the value of a1 using the information given. (assume r >0) 2.a3=324, a7=64 Find the indicated sum. 3. a1=2, r=-3; find s8 4. E like symbol with a 10 on top. On the bottom k=1 to...
*April 8, 2013*

**Algebra **

I need some help with algebra as I'm confused as to how to solve them. Find the common difference d and the value of a1 using the information given. 1. a6= 5/4, a8= 9/4 Evaluate each sum. 2. E like symbol that has a 29 on the top. On the bottom n=1 and to the right (4n-1) ...
*April 8, 2013*

**Algebra**

Thank you this was very helpful!
*April 8, 2013*

**Algebra **

I need some help with algebra I'm not sure how to get to the answer. Find the number of terms in each sequence. 1. a1=4 an=42 d=2 2. a1--0.3 an=-36 d=2.1 3. 1/12, 1/8, 1/6, 5/24, 1/4,......9/8 Evaluate each sum. 1. There is an e like symbol that has a 15 on top on the ...
*April 8, 2013*

**math**

If Deborah ate five pieces of a pizza that was cut into 16 pieces, what percentage of the pizza did she eat?
*April 5, 2013*

**Physics**

A compact disk rotates from rest to 500 rev/min. in 5.5s. a) What is the angular acceleration assuming it is constant. b) How many revolutions does the disk make in 5.5 s. c) How far does a point on the rim 6 cm from the center of the disk traveling during the 5.5 s.
*April 4, 2013*

**Chemistry**

Determine the number of particles in this sample. Identify the unit as a formula unit or a molecule. 58 g of chromium (III) sulfate.
*April 3, 2013*

**math**

a cleaner charges $0.50 per square foot to polish wood floors. a school hall has a floor area of 30 feet by 50 feet. what would be the total cost to polish the floor of the school hall? A. $80 B. $375 C $750 D $1,500 I think it is C.
*March 27, 2013*

**math**

A cleaner charges $0.50 per square foot to polish wood floors. A school hall has an area of 30 feet by 50 feet. What would be the total cost to polish the floor of the school hall? A.$80 B.$375 C.$750 D.$1,500 What is the answer?
*March 26, 2013*

**algebra**

What is 80 is 20 times as many as 5 equal in a number sentence?
*March 25, 2013*

**3rd grade math**

it is A. 1/2
*March 20, 2013*

**Physics**

A) With what minimum speed must you toss a 190 g ball straight up to hit the 15.0 m-high roof of the gymnasium if you release the ball 1.70 m above the ground? Solve this problem using energy. B) With what speed does the ball hit the ground?
*March 20, 2013*

**Physics**

A) With what minimum speed must you toss a 190 ball straight up to hit the 15.0 -high roof of the gymnasium if you release the ball 1.70 above the ground? Solve this problem using energy. B) With what speed does the ball hit the ground?
*March 20, 2013*

**4th grade math**

the answer is 168 because there are 12 inches in a foot. you could add 12 for 14 times or do 12*14.
*March 19, 2013*

**Dynamics, Math**

a plane is flying horizontally at an altitude of 420m. A bomb was released, how far horizontally point bomb hit the ground?
*March 19, 2013*

**Dynamics, Math**

a plane is flying horizontally at an altitude of 420m. A bomb was released, how far horizontally point bomb hit the ground?
*March 19, 2013*

**English**

This time management tool is used for recording how you spend your time daily.
*March 13, 2013*

**math**

5x+4y-5z=44 3x-4y+3z=-10 6x-3y+6z=-15 help solve it
*March 13, 2013*

**math**

4x-y-3z=8 2x+2y-z=3 6x+y-3z=2 help me solve matrices
*March 13, 2013*

**english**

so what is correct answer,thanks
*March 8, 2013*

**english**

Answer is A
*March 8, 2013*

**Physics**

A 50.0g ball of clay traveling east at 3.00 m/s collides and sticks together with a 50.0g ball of clay traveling north at 3.50m/s. What is the speed and direction of the resulting ball of clay?
*March 7, 2013*

**Calculus**

Determine if the series converges or diverges. Sum (n=1, infinity) (2*4*6...2n)/n! My main problem is I have no idea what to do with the numerator.
*March 4, 2013*

**Physics**

A conical pendulum is formed by attaching a 0.200kg ball to a 1.00 m-long string, then allowing the mass to move in a horizontal circle of radius 40.0cm . The figure (Figure 1) shows that the string traces out the surface of a cone, hence the name. A) What is the tension in ...
*February 28, 2013*

**Physics**

A 220g block on a 54.0cm -long string swings in a circle on a horizontal, frictionless table at 70.0 rpm. A) What is the speed of the block? m/s B) What is the tension in the string? N
*February 28, 2013*

**Physics**

A 220g block on a 54.0cm -long string swings in a circle on a horizontal, frictionless table at 70.0 rpm. A) What is the speed of the block? m/s B) What is the tension in the string? N
*February 28, 2013*

**maths**

A box of mass 3 units rests on a horizontal rough surface and is tied to the end of a rope. Peter pulls on the rope and exerts a force of magnitude sqrt(2g) with the rope making an angle of Pi/4 with the horizontal. Given that the box is on the point of slipping, show ...
*February 27, 2013*

**Algebra**

the length of a rectangular piece of land is 40 cm more than two times its width. the perimeter is 680 cm. Find its dimensions
*February 26, 2013*

**maths**

A particle moves in a plane with trajectory given by the polar equation, r = a(1 + cos );where a is a positive constant Suppose that the particle moves such that theta(t) =omega for all t; that is, the angular velocity theta is constant.Show that the ...
*February 20, 2013*

**Chem II**

I feel I wasnt given enough information to answer the question originally, but I will try to do my best with what I was given.
*February 12, 2013*

**Chem II**

How many grams of ethylene glycol (C2H6O2) per kilogram of water are needed to give protection up to 120 °C in a car radiator?
*February 12, 2013*

**Calculus**

Approximate the sum Sigma (lower n = 0; upper infinity) (17/3)*(-1/2)^n
*February 11, 2013*

**Calculus**

What is the graph of the sequence An = (-1)^n?
*February 11, 2013*

**Calculus**

Find the sum of the convergent series. Sigma (lower n = 0; upper infinity) 8*(4/5)^n
*February 11, 2013*

**Calculus**

Identify the two series that are the same. a. Sigma (lower n = 4; upper infinity) n(3/4)^n b. Sigma (lower n = 0; upper infinity) (n+1)(3/4)^n c. Sigma (lower n = 1; upper infinity) n(3/4)^(n-1)
*February 11, 2013*

**Calculus**

Find the values of x for which the series converges. Sigma (lower index n = 0; upper index infinity) [(x+1)/4]^n
*February 11, 2013*

**Calculus**

Determine whether the sequence with the given nth term is monotonic. Find the boundedness of the sequence. Otherwise, indicate DNE. An = ne^(-n/2)
*February 11, 2013*

**Calculus**

Determine the convergence or divergence of the series. Indicate the test that was used and justify your answer. Sigma (lower index n = 1; upper index infinity) [(-1)^n*3^n]/(n*2^n)
*February 11, 2013*

**Calculus**

Test for convergence or divergence. Indicate the test that was used and justify your answer. Sigma (lower index n = 2; upper index infinity) [ln(n)]/n
*February 11, 2013*

**Calculus**

Use the Direct Comparison Test to determine the convergence or divergence of the series. Justify your answer and show all of your work. Sigma (lower index n = 1; upper index infinity) 4^n/(3^n-1)
*February 11, 2013*

**Calculus**

Test for convergence or divergence. Indicate the test that was used and justify your answer. Sigma (lower index n = 4; upper index infinity) 1/(3n^2-2n-15)
*February 11, 2013*

**Calculus**

Determine the following about the series. Indicate the test that was used and justify your answer. Sigma (lower index n = 1; upper index infinity) [sin((2n-1)pi/2)]/n A. The series diverges B. The series converges conditionally. C. The series converges absolutely. D. It cannot...
*February 11, 2013*

**Calculus**

Determine the convergence or divergence of the series. Find the limit. Indicate the test that was used and justify your answer by showing evidence why the test succeeds or fails. Sigma (lower index n = 1; upper index infinity) 12/[n(n+3)]
*February 11, 2013*

**Calculus**

A deposit of $1000 is made at the beginning of each month in an account at an annual interest rate of 3% compounded monthly. The balance in the account after n months is An = 1,000(401)(1.0025^n - 1). (a) Compute the first six terms of the sequence {An}. (b) Find the balance ...
*February 11, 2013*

**maths**

What is the vector equation of the line joining the points (5; 0; 1) and (7; 4; 7)?
*February 11, 2013*

**maths**

prove that if a is not equal to zero and if a * b = a * c and a ^ b = a ^ c then b = c [Hint: calculate a * (b-c) and a ^ (b-c) vectors mechanics
*February 6, 2013*

**college chem**

if the length of one side of a square is 12.0, what is the perimeter of the square?
*February 4, 2013*

**Math**

where did the 1.2 come from?
*January 31, 2013*

**Math**

The markup on a used car was at least 20% of its current wholesale price. If the car was sold for $5900, what was the maximum wholesale price? (Give your answer correct to the nearest dollar.)
*January 31, 2013*

**Math**

Write each rate as a fraction in lowest terms: 48 gallons in 14 minutes
*January 29, 2013*

**Math**

Write each rate as a fraction in lowest terms: 48 gallons in 14 minutes
*January 29, 2013*

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