Saturday

April 25, 2015

April 25, 2015

Total # Posts: 2,932

**Chemistry **

One mole of N2 and 3 moles of H2 are placed in a flask at 375 degree celsius.? Calculate the total pressure of the system at equilibrium if the mole fraction of NH3 is found to be 0.21. The Kp for the reaction is 4.21 x 10 raise to -4
*April 22, 2015*

**Science**

The effect _______ explains how fast air moves across a surface, the ____ pressure that presses on that surface. In contrast, the more ____ that air moves, the more of _____ there will be. I'm sorry that it might not make sense, I translated it from French. I tried using ...
*April 21, 2015*

**Math**

Hi again. Just realised that i got B wrong. So it means i need that too. Just to clarify (b) Show that if x and y are related by the equation √x + √y = 1 then dy _____ dx= -√(y/x) _ _ I got -√y/-√x.
*April 21, 2015*

**Math**

In this problem we consider drawing some straight lines which form a nice pattern. Consider joining the point (0.1,0) to the point (0,0.9) by a line segment; then joining (0.2,0) to (0,0.8) by a line segment; and so on. In general, consider joining the points (a,0) and (0,b) ...
*April 21, 2015*

**history**

Gaul is the Roman term for what modern country?
*April 20, 2015*

**Math**

7. You are having a discussion about sequences with your classmate. She insists that the sequence 2, 3, 5, 8, 12 must be either arithmetic or geometric. Is she correct or incorrect? Explain.
*April 17, 2015*

**AP Chemistry**

The thing is I tried the negative p delta v on my UT homework, and it didn't accept so I thought maybe moles had something to do with it. Unless I was doing the equation wrong.
*April 16, 2015*

**AP Chemistry**

How much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.1 liters against a constant external pressure of 0.0100 atm? Answer in units of J. I get w=-p(deltaV) but what about moles?
*April 16, 2015*

**6th grade math**

Chris has made the following grades on five math test. 90,74,86,75,94 What score must Chris earn on the next math test to have a test average of exactly 85?
*April 14, 2015*

**6th grade math**

While battling a forest fire , Samuel was only able to get three hours of sleep during the first day. What was the percent of the day was Sam awake F. 87.5% G. 37.5% H. 90% J. 10%
*April 14, 2015*

**Physics**

A spring of length 10.0 cm and spring constant 160 kN/m is compressed to a length of 4.00 cm. If, when released, it pushes a block of mass 100 kg, a) what is the speed of the block after it slides up a 15.0 cm hill? b) What is its speed after it falls into a 10.0 cm dip?
*April 9, 2015*

**ttu**

The triprotic acid H3A has ionization constants of Ka1 = 2.5× 10–4, Ka2 = 3.4× 10–8, and Ka3 = 5.4× 10–13. Calculate the following values for a 0.0760 M solution of NaH2A
*April 9, 2015*

**chemistry**

how many electrons can n=4 l=1 have?
*April 8, 2015*

**Spanish**

in that case if you are referring to a specific cafeteria like the school's cafeteria it would be "la comida de la cafeteria no es saludable" if not then "la comida de cafeteria no es saludable"
*April 7, 2015*

**Spanish**

Are you going to write it with in a sentence or by itself?
*April 7, 2015*

**Trigonometry**

Solve each equation, giving a general formula for all of the solutions: a. 2sin^2(x)-5 sin(x)-3=0 b. (cos(x)-((sqrt2)/2))(sec(x)-1)=0
*March 28, 2015*

**Trigonometry**

Solve each equation for theta, giving a general formula for all of the solutions: a. tan(theta)=-1 b. sin(theta/2)=1/2
*March 28, 2015*

**English**

i dont know
*March 25, 2015*

**English**

During our summer vacations, we would always go out to our cabin by Butterfly Creek. The trips were always fun and relaxing. We would take hikes, photograph the wildlife, and swim in the river. Wildflowers in high meadows. Butterflies hovering. I still remember the smell of ...
*March 25, 2015*

**science**

based on the masses of CaCl2 and Na3PO4 you determined from the periodic table, what mass combining ratio would you predict?
*March 22, 2015*

**Chemistry**

If there are 57.6 mL of water that change from 19.4 degrees Celsius to 34.7 degrees Celsius, calculate the number of joules of energy transferred in the form of heat. Round to the nearest whole number. The specific heat capacity of water is 4.18 J/g*C and density of water is 1...
*March 22, 2015*

**Economics**

1. What determines the size of the key-money payments that landlords demand (and tenants offer) for the right to rent a controlled apartment? 2. Who, other than the owners of rental units, loses as a result of rent controls? Who gains from rent controls? What effect would the ...
*March 20, 2015*

**business math**

Stereo Inc. sells a stereo system for $500 down and monthly payments of $60 for the next 4 years. If the interest rate is 1.75% per month, find: a) The cost of the stereo. b) The total amount of interest paid.
*March 18, 2015*

**French, foreign language**

Read each definition and write the appropriate word or expression in the space provided. 1. C'est un plat typiquement français. On les prépare avec du beurre et de l'ail. Ce sont un escargot . (incorrect) 4.On les utilise pour faire des omelettes. Ce sont...
*March 18, 2015*

**French, foreign language**

Hi, I need help with answering some questions for French Here's my work on them tell me what you came up with for each question that is incorrect: 1.C'est un plat typiquement français. On les prépare avec du beurre et de l'ail. Ce sont un escargot (...
*March 17, 2015*

**calculus **

1.) Find the derivative of ((x + 3)/e^x) ^ (Log e X) 2.) T/F (log e X)' = (log e |x|)' 3.) T/F (Log e 7x)' = (log e x)' 4.) Find the derivative of e^(log e 7x)
*March 15, 2015*

**algebra**

What is a quadratic function?
*March 13, 2015*

**math (answer check)**

The coordinates of two vertices of triangle DEF are D(-5,5) and E(9,8). Determine two possible coordinates for for F that would make DEF a right triangle ? ans: slope DE = 8-5 / 9 - (-3) = 3/12 I don't know this part :how to Determine two possible coordinates for for F ...
*March 12, 2015*

**Physics**

A pilot wants to fly directly north to an airport 500 km away. His speed relative to the air is 100 km/h. Howevere there is a 40 km/h cross wind blowing from west to east. At what angle relative to the south north direction should he fly to arrive at the distant airport? How ...
*March 11, 2015*

**Foreign Language, French**

Can you please proofread my answers to the questions assigned by my teacher and correct me where needed? 1. découvrir / vieille / qu'est-ce qu' / dans / ils / valise / la Qu'-est-ce qu' ils veieille ont découvert la valise? 2. cette / nous / ...
*March 10, 2015*

**science**

Part I: Units of Measurement for Gas Laws For the following questions, use the following answer choices to indicate what each unit of measurement is used to measure (pressure, volume, or temperature). 1. atm 2. kPa 3. L 4. oC 5. torr 6. K 7. mL 8. cubic centimeters (cm3) ...
*March 2, 2015*

**chemistry**

everything
*March 2, 2015*

**chemistry**

Find the molar masses of the following compounds: 1. LiI 2. PbCO4 3. Mg(OH)2 4. (NH4)3PO4 Find the percent composition (percent by mass) of the given element in the following compounds: 1. Fluorine in AgF 2. Hydrogen in glucose (C6H12O6) 3. Oxygen in Fe2(SO4)3 PART II: ...
*March 2, 2015*

**Chemistry Help**

Thank you so much DrBob222. Now I understand.
*February 27, 2015*

**Chemistry Help**

I calculated the answer is 58.8%, but i'm not sure. Can anyone please help me make sure this answer please.
*February 27, 2015*

**Chemistry Help**

The theoretical yield of Cl2 that could be prepared by mixing 15.0 g of manganese dioxide (MnO2) with 30.0 g of HCl is 12.2 g. The limiting reagent was MnO2. When the reaction was run only 8.82 g of Cl2 was collected. The percent yield of Cl2 is_? a)58.8 % b)72.3 % c)29.4 % d)...
*February 27, 2015*

**Calculus II**

A square plate of side 3 m is submerged in water at an incline of 30 degrees with the horizontal. Calculate the fluid force on one side of the plate if the top of the plate lies at a depth of 6 m. (* The only thing i can think to use is the equation: p * g * (S from a to b of...
*February 26, 2015*

**Math**

Describe how to rename an improper fraction as a mixed number. Use an example to explain. I don't get the "renaming" part. Does it mean to explain how to convert it?
*February 24, 2015*

**French**

5 - Les vacances You are preparing a family vacation in Europe. Rewrite each sentence using two pronouns. Pay particular attention to the agreement of the past participle. 1.-L'agence de voyages a envoyé les billets d'avion à mes parents. 2.-Mes parents ...
*February 24, 2015*

**French**

Did I do this correctly: 1. Malika / une pêche Malika a demande une peche, mais il lui a donne une poire. 2. Soraya / une tomate Soraya a demande une tomate, mais il lui a donne un oignon. 3. Daniel / du pâté Daniel a demande du pate, mais il lui a donne des...
*February 24, 2015*

**math**

Is this right 6(5y-4) 30y-24 Need help with this one -3+2(6z-3+4)
*February 24, 2015*

**Math**

You roll a number cube and get a one 7 times, a two 8 times, a three 5 times, a four 9 times, a five 8 times, and a six 5 times. What is the experimental probability of rolling an odd number?
*February 20, 2015*

**Math**

A spinner is split up into 4 colored areas of the same size: red, blue, green, and yellow. What is the theoretical probability of the spinner landing on one of these four colors?
*February 20, 2015*

**Math**

A standard deck of cards contains 52 cards. Of these cards there are 13 of each type of suit (hearts, spades, clubs, diamonds) and 4 of each type of rank (A – K). Four cards are pulled in order from this deck of 52 playing cards. What is the probability that the cards ...
*February 19, 2015*

**Math (Probability)**

A standard deck of cards contains 52 cards. Of these cards there are 13 of each type of suit (hearts, spades, clubs, diamonds) and 4 of each type of rank (A – K). Two cards are pulled in order, without replacement from this deck of 52 playing cards. What is the ...
*February 19, 2015*

**Finance**

Bob bought an 8.5% annual coupon bond at par. One year later, he sold the bond at a quoted price of 98. During the year, market interest rates rose and inflation was 3%. What real rate of return did Bob earn on this investment?
*February 19, 2015*

**French**

# 2: Sonyra a demande une tomate, mais il lui a donne un ognion. #3- Daniel a demande du pate, mais il lui a donne des oeufs #4- Raphael a demande un poviron rouge, mais il lui du champignons.
*February 18, 2015*

**French**

Thanks!
*February 18, 2015*

**French**

3 - Au marché The new employee can't get anyone's order right. Say what each customer asked for and what the employee gave them. Modèle-je / des frites J'ai demandé des frites, mais il m'a donné du pain. 1. Malika / une pêche ...
*February 18, 2015*

**math**

Point R is located in quadrant 1. Point S is located in quadrant 3.
*February 18, 2015*

**algebra**

An artist framed a rectangular picture. The dimensions of the frame are 4x+3 and 3x+5. He is going to place the picture with the border of 2 inches. Then he wants to paint the border. What is the area he has to paint?
*February 17, 2015*

**Physical Science**

A rock is dropped off a 20m tall cliff. How long does it take to get to the bottom of the cliff? What is the instantaneous velocity right before it hits the bottom of the cliff?
*February 17, 2015*

**geometry**

Jamie needs to find the missing angle of a right triangle with the third angle measuring 62 degrees. What is the measure of the third angle of the triangle?
*February 10, 2015*

**chemistry**

Calculate the energy of a photon of wavelength 3.1 µm with that of wavelength 0.166 nm. What I Got: 3.1 µm photon: 6.36x10^22j 0.166nm photon: 1.23x10^19j Also, what region of the electromagentic spectrum would each of these measurements belong to?
*February 8, 2015*

**6th grade math**

Does <= means less than or equal to
*February 8, 2015*

**6th grade math **

To qualify for a store discount, Clay's soccer team must spend at least $560 for new jerseys. The team needs 20 jerseys. Write and solve an inequality to represent how much the team should spend on each jersey to qualify for the discount.
*February 8, 2015*

**Physics**

whats a fbd
*February 7, 2015*

**Physics**

i need help
*February 7, 2015*

**Physics**

i cant put the image : ((((
*February 7, 2015*

**Physics**

what is that ?
*February 7, 2015*

**Physics**

A vector has magnitude 58.0 units and is inclined to the positive axis of x at 42.0°. Vector has magnitude 36.0 units and is inclined to the positive axis of x at 121°. Vector has magnitude 40.0 units and is inclined to the positive axis of x at 53.0°. Use the ...
*February 7, 2015*

**Physics**

A river flows at a speed of 4.60 m/s. A boat, capable of moving with a speed of 5.80 m/s in still water is rowed across the river at an angle of 53.0° to the river flow. Calculate the resultant velocity with which the boat moves and the angle that its resultant motion ...
*February 7, 2015*

**Physics**

An airplane has to fly eastward to a destination 856 km away. If wind is blowing at 18.0 m/s northward and the air speed of the plane is 161 m/s, in what direction should the plane head to reach its destination?
*February 7, 2015*

**Physics**

The blocks A and B are connected by a piece of spring. Block B rests on an inclined plane of 40° and block A hangs vertically. The coefficient of kinetic friction between block A and the inclined plane is 0.29. Calculate the acceleration of the system if the mass of block ...
*February 7, 2015*

**Physics**

An athlete runs 2.76 km east, then turns south and runs another 0.85 km. What is the magnitude of his displacement?
*February 7, 2015*

**Physics**

Find the magnitude of the sum of two forces, one 24 N and the other 9 N, when the angle between them is 60.0o.
*February 7, 2015*

**Physics**

What should be the angle between two vectors of magnitudes 4.10 and 4.40 units, so that their resultant has a magnitude of 3.90 units?
*February 7, 2015*

**Physics**

The blocks A and B are connected by a piece of spring. Block B rests on a smooth inclined plane of 35° and block A hangs vertically. Calculate the acceleration of the system if the mass of block A is 1.06 kg and that of block B is 6.4 kg
*February 7, 2015*

**Algebra 2**

Simplify each expression. 1+sqrt(3) ______________ sqrt(3)-sqrt(2) *this is a division radical expression please show work!!
*February 7, 2015*

**Algebra 2**

Simplify this expression sqrt(3y^3)*sqrt(4xy^4)*sqrt(6x^5y^2) Please show work!!!
*February 7, 2015*

**Statistics**

25
*February 6, 2015*

**physics**

An arrow is shot straight upward into the air and it returns to the ground with a speed of 28m/s. What was the maximum height reached by the arrow?
*February 5, 2015*

**physics**

A 98.0 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 49.5 m/s. If both are initially at rest and if the ice is frictionless, how far does the player recoil in the time it takes the puck to reach the goal 13.5 m away?
*February 3, 2015*

**Math 20-1**

The most convenient test point to use to determine if the points in a region defined by y<1.4x+0.6 satisfy the inequality is
*February 1, 2015*

**Math 20-1**

The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm^2 ? (2 marks)
*February 1, 2015*

**Calculus**

Write 2.445353535353... as a fraction I'm learning integrals right now and this is part of the exercises under it. Is there a trick to this? Using integrals? Thank you very much!
*January 31, 2015*

**Science**

Kate don"t you see that the ** means corect answer. it did help me get an A on my math test
*January 29, 2015*

**Math 20-1**

What is the solution for 2x^2-7x>-3? (2 marks) (Show your work)
*January 29, 2015*

**Math 20-1**

A boundary line that is dashed is represented by the inequality symbol: ?
*January 29, 2015*

**Math 20-1**

The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm^2? (2 marks)
*January 29, 2015*

**physics**

Heather and Matthew walk eastward with a speed of 0.90 m/s east. If it takes them 31 min to walk to the store, how far have they walked? Answer in units of km.
*January 29, 2015*

**Math**

Using this graph, find the average lengths of cellular calls for the year 2013. Year:|Avg length (L) in minutes: 1999|2.38 2000|2.56 2001|2.74 2002|2.73 2003|2.87 2004|3.05 I think the answer is 4.08 minutes but I also got 3.97 so I'm not sure, can you tell me if I'm ...
*January 29, 2015*

**Math 20-1**

The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm^2? (2 marks)
*January 28, 2015*

**Math 20-1**

What is the solution for 2x^2-7x > always greater than -3 ? (2 marks) (Show your work)
*January 28, 2015*

**Science**

The answer is A. point source
*January 28, 2015*

**algebra**

what would the length of a spring be if a 4 lb weight stretched a spring to 20in and a 16 lb weight stretched a spring 26in
*January 27, 2015*

**Chemistry**

When iron rusts in air, iron (III) oxide is produced. How many moles of oxygen react with 7.2 mol of iron in the rusting reaction? 4Fe(s)+3O2=2Fe2O3(s)
*January 27, 2015*

**Math 20-1**

Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modeled by the quadratic function h(t) = -16t^2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the nearest hundredth. (2 ...
*January 27, 2015*

**math**

Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark) Here's my work on it: kx^2-5x+2=-3x+4 kx^2-2x-2=0 a)b^2-4ac (-2^2-4(1)(-2) (-4--8) (4) ...
*January 27, 2015*

**math**

Can you please show your work as to how you got this answer?
*January 26, 2015*

**math**

A square storage area measures 10 m on a side. By how much must each side be shortened to decrease this area to less than half the original area? (3 marks - show your work)
*January 26, 2015*

**math**

The length of a rectangle is 5 cm more than its width. What are the possible dimensions of the rectangle if the area must be at least 84 cm2? (2 marks)
*January 26, 2015*

**math**

Suppose the height, h, in feet, of a trampolinist above the ground during one bounce is modelled by the quadratic function h(t) = -16t^2 + 42t + 3.75 . For what period of time is the trampolinist at least 22 ft above the ground? Round your answers to the nearest hundredth. (2 ...
*January 26, 2015*

**math**

Determine the value of k in y=kx^2-5x+2 that will result in the intersection of the line y=-3x+4 with the quadratic at a) two points (1 mark) b) one points (1 mark) c) no point (1 mark) Please and thank you!
*January 26, 2015*

**math**

Here's my question: Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the ...
*January 26, 2015*

**math**

Here's my question: Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the ...
*January 26, 2015*

**math**

Here's my question: Determine if each system has one, two, or no solutions. (Show your work - 3 marks each) a)y=2x^2-2x+1 and y=3x-5 b)y=x^2+3x-16 and y=-x^2-8x-18 Here's my work on the question: a) x=(-b plus/minus sign (square root b^2-4ac)/(2a) x=(--2 plus/minus ...
*January 26, 2015*

**math**

Determine if each system has one, two, or no solutions. (Show your work - 3 marks each) a)y=2x^2-2x+1 and y=3x-5 b)y=x^2+3x-16 and y=-x^2-8x-18
*January 26, 2015*

**math**

Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the fireworks is y=-x^2+15x, ...
*January 26, 2015*

**math**

Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 If the path of the fireworks is y=-x^2+15x, ...
*January 26, 2015*