Tuesday

March 31, 2015

March 31, 2015

Total # Posts: 1,570

**science**

What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 60 m/s and a second 1500 kg car moving west at 95 m/s? Let east be the positive direction. Answer in units of kg · m/s.
*March 29, 2015*

**Math**

3.8?
*March 27, 2015*

**Math**

3. A rectangular prism has a width of 92 ft and a volume of 240 ft3. Find the volume of a similar prism with a width of 23 ft. Round to the nearest tenth, if necessary. (1 point) 3.8 ft3 60 ft3 15 ft3 10.4 ft3 Please help me work this out! I'm not sure how to do this
*March 27, 2015*

**History**

Vaguely
*March 23, 2015*

**History**

Henry Clay: What did they say about their hopes for the future of the United States? How did they work to help change the United States? How did they react to key events happening in the United States? Were there any key events in each person’s life that shaped their ...
*March 23, 2015*

**chem**

. Antimony pentachloride decomposes according to the following equation. SbCl5 (g) → SbCl3 (g) + Cl2 (g) Suppose that 10.0 g of antimony pentachloride is placed in a 5.00 L container and allowed to establish equilibrium. Calculate the concentration of all species at ...
*March 20, 2015*

**Math**

Oh sorry I forgot to put the key and the formatting kind've screwed up let me fix that. Doctor 1 Doctor 2 | 3 | 5 9 2 0 | 2 | 0 0 2 3 6 8 7 5 | 1 | 3 7 9 7 3 2 1 1| 0 | 2 2 3 9 Key = 5|1 = 15 1|3 = 13 E.G 5|1|3 (15, 13)
*March 19, 2015*

**Math**

the back-to-back stem-and-leaf plot below shows the ages of patients seen by two doctors in a family clinic one day. what is the difference between the age of the oldest patient seen by doctor 1 and the age of the oldest patient seen by doctor 2. AGE OF DOCTORS PATIENTS Doctor...
*March 19, 2015*

**Algebra**

1.A right triangle has leg of b of length 7 and a hypotenuse of length 11. What is a length of the other leg, a? Round to the nearest tenth if necessary. (1 point) A. 2.0 B. 8.5 C. 13.0 D. 9.6 2. Find the length of a line segment CD with endpoint C at (-3,1) and endpoint D at...
*March 19, 2015*

**maths**

Let's say the Purse is a variable like P P + P + 18.20 = 98 2P = 79.80 (Divide that into two) = 39.90 Answer: P = 39.90
*March 19, 2015*

**chemistry**

thank you
*March 15, 2015*

**chemistry **

An aqueous solution contains 64g of ethanol( C2H5OH) in 122 grams of solution. The mole fraction of ethanol is:
*March 15, 2015*

**Math**

Don't answer this anymore.... I got it
*March 14, 2015*

**Math**

Find the 10th term of a nonconstant arithmetic sequence whose 1st term is 3 with the 1st, 4th, and 13th term forming a geometric sequence. I've tried doing it differently everytime, but I always come to a dead end..
*March 14, 2015*

**algebra2**

(x-5)^1/3=2 then you raise 2 to the 3rd power add 5 and voila...x=13
*March 14, 2015*

**algebra2**

X=13
*March 14, 2015*

**CHEMISTRY HELPPPP!!!!!!!!!**

Consider the decomposition of NH3 (g). 2 NH3 (g) → N2 (g) + 3 H2 (g) The reaction is catalyzed on a surface of either tungsten or osmium. The activation energies for the catalyzed and uncatalyzed reactions are given below. W Ea = 163 kJ/mol Os Ea = 197 kJ/mol No catalyst...
*March 11, 2015*

**Statistics**

Shopping Outlet A shopping outlet estimates the probability distribution of the number of stores shoppers actually enter as shown in the table below. x 0 1 2 3 4 p(x) 0.05 0.35 0.25 0.20 0.15 What is the probability that shoppers are just window shopping and not entering any ...
*March 11, 2015*

**Chemistry**

D=PM/RT Pressure= 1 atm R= constant value (Use google) T= 273K For M.M of xenon use periodic table
*March 10, 2015*

**Chemistry**

PV=nRT T=PV/nR
*March 10, 2015*

**chemistry**

PV=nRT Convert grams into moles.(1/32+12) Temperature must be in Kelvin (273K) Pressure must be in atm. And R is a constant value (Google it) so V=nRT/P
*March 10, 2015*

**Chemistry**

P=nRT/V
*March 10, 2015*

**Chemistry**

A student mixes 5.0 mL of 0.00200 M Fe(NO3)3 with 5.0 mL 0.00200 KSCN. She finds that the concentration of FeSCN2+ in the equilibrium mixture is 0.000125 M. Follow these steps to determine the corresponding experimental value of Kc for the reaction of Fe3+ and SCN– to ...
*March 10, 2015*

**arabic!!!**

3. مَا .......... ياَ أَخِي ؟ إِسْمِي سَالِم أ. إِسْمُكِ &#...
*March 7, 2015*

**career**

kers. They like accomplishing their work step-by-step and are good record keepers. a. conventional* b. enterprising c. social d. realistic
*March 6, 2015*

**P.E.**

About 80% of infections disease is spread by hand contact. True* False
*March 5, 2015*

**Art**

My answers: 1.b 2.d 3.d 4.c 5.d
*March 2, 2015*

**Art**

During which time period were artists keenly interested in using the golden ratio in their paintings? A.Baroque Period B.Oriental Period C.Futuristic Period D.Renaissance Period When the Greeks built the Parthenon its dimensions nearly matched the golden ratio which is the ...
*March 2, 2015*

**Language arts**

It's C
*February 27, 2015*

**physics**

Background: the Centaur impacts the moon with a velocity of 2.500 km/s (relative to the moon). Why is it acceptable to assume that the impact velocity will be consistent, even if the mass is not consistent? (Hint: think about the path that the vehicle approaches the moon)
*February 27, 2015*

**chemistry**

What I was saying in the response was that with your help I got to that part, but I was still confused on the formula. I got it now. Thank you.
*February 25, 2015*

**chemistry**

I can get to the PV=nRT part. What number would you put for R?
*February 25, 2015*

**chemistry**

What volume of oxygen gas can be collected at 0.565 atm pressure and 48.0◦C when 42.9 g of KClO3 decompose by heating, according to the following equation? 2 KClO3(s) ∆−−−−→2KCl(s) + 3O2(g) MnO2
*February 25, 2015*

**Physics**

Please help due in less than 2 hours!! A person whose mass is m = 86.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 21.3° with the horizontal. What is the reading on the scale? i've tried m*g*sin(21.3) and it still ...
*February 23, 2015*

**Physics**

never mind it's 0, just seemed too simple
*February 23, 2015*

**Physics**

A cube of mass m1 = 6.8 kg is sitting on top of another cube of the same size and mass m2 = 0.7 kg while they are both in free-fall. Ignoring any air resistance, what is the magnitude of the normal force with which the bottom cube is acting on the top cube? I've tried ...
*February 23, 2015*

**calculus**

State whether or not the following statements are true. Justify your reasoning.? a. Vector a • (Vector b + Vector c) = Vector a • Vector b + Vector a • Vector c b. Vector a × (Vector b + Vector c) = Vector a × Vector b + Vector a × Vector c c. ...
*February 23, 2015*

**math**

A vector can be used to represent the path of a drill tip used to bore a deep mine shaft in Sudbury one quarter of the way to the centre of the Earth. Represent the vector using a directed line segment and Cartesian co-ordinates and describe which representation may be more ...
*February 21, 2015*

**Math**

a circle is divided into 9 equal parts. What is the angle measure of two of those parts
*February 9, 2015*

**precalculus**

Find the number of negative integers greater than -500 that are divisible by 33. Also find their sum. How do I set up this problem?
*February 8, 2015*

**Calc B/C**

Assume no air friction and that the acceleration due to gravity is 10 meters/sec^2. A ball is moving horizontally at a rate of 5 meters/sec. until it falls off the edge of a platform. The height, h, of the platform would have to be ___ meters if the ball hit the ground 8 ...
*February 7, 2015*

**Calc B/C**

The common external tangents to the graphs for (x+1)^2+y^2=1 and (x-2)^2+y^2=4 are drawn. Find the slope of the tangent line that has a positive slope. I tried finding the derivatives and setting them equal to each other, but that didn't give me an answer. Please help!
*February 7, 2015*

**Physics**

A mass of 0.3 kg is attached to the end of a massless spring of spring constant 0.25 N/m. It is released from rest (t=0). After 0.7 s, the speed of the mass is measured to be 2.0 m/s. What is the amplitude of oscillation?
*February 7, 2015*

**Calc**

If y=3x^2-2, then dy/d(2x-3)= ? I've never taken derivatives with respect to anything other than a single variable, such as x, y or t, so i'm not sure how to start this problem! Thanks
*February 6, 2015*

**art**

what is number 8
*February 5, 2015*

**Language Arts**

Themselves? Try again!! Remember. Personal Pronoun in the objective case...
*February 4, 2015*

**precalculus**

Solve the triangle α = 27 degrees 30', c = 52.8, a = 28.1
*February 1, 2015*

**Social Studies**

#5 is actually just C and D
*January 27, 2015*

**Physics**

Instead of copy pasting every problem from loncapa why don't you try attempting them yourself?
*January 27, 2015*

**english check**

Treat the Earth and all that dwell thereon with respect. Remain close to the Great Spirit. Show great respect for your fellow beings. Work together for the benefit of all Mankind. Give assistance and kindness wherever needed. Do what you know to be right. Look after the well ...
*January 23, 2015*

**english**

1. The Cherokee people are being addressed and it is written in first, second, and third person. 2. Respect to the people around you, cooperation, giving and showing kindness, honesty and truthfulness, taking care of yourself. 3. They Cherokee people follow these commandments ...
*January 23, 2015*

**english**

Treat the Earth and all that dwell thereon with respect. Remain close to the Great Spirit. Show great respect for your fellow beings. Work together for the benefit of all Mankind. Give assistance and kindness wherever needed. Do what you know to be right. Look after the well ...
*January 23, 2015*

**Language Arts**

B is correct
*January 21, 2015*

**Language Arts**

What does Johnny’s mastery of riding Goblin show about his character? A. He is rash and quick-tempered. B. He is brave and determined. C. He is immature and selfish. D. He is arrogant and proud
*January 21, 2015*

**math**

x+4x/15-x=-7/3-3/5 (bringing like terms together) 4x/15=-7/3-3/5 (Make the denominator common by multipying 3 with 5 and 5 by 3)(Also multiply the numerator by the same numbers) 4x/15=-35-9/15(15 cancels out on both sides) 4x=-44 (divide 44 by 4) x=-11
*January 19, 2015*

**language art**

Think about the work you completed in your reading character role. Determine the ideas that would be most worthy to share in a literary discussion about Johnny Tremain. Provide an explanation for your choices. How did the role you selected and the work you completed help you ...
*January 14, 2015*

**algebra**

9 to 12. 9+12=21 21/2=10.5
*January 8, 2015*

**Chemistry **

If 4.5 moles of elemental carbon react, what volume of carbon dioxide will be produced at STP?
*January 8, 2015*

**Langague Arts 8th Grade**

anyone know the answers for this?
*January 4, 2015*

**Langague Arts 8th Grade**

What did you get for your answers?
*January 4, 2015*

**Calculus**

a balloon rises straight up to 5 ft/sec. and a crying child who lost the balloon is standing 40 ft away. how fast does the balloon move away from the child when it is 30 ft above the ground?
*January 4, 2015*

**Math**

find the distance between point A(5,3) and point B (1,0) on a graph using the Pythagorean Theorem.
*December 28, 2014*

**Math**

a line has a slope of 6 and a y-intercept of –10. which is the equation in slope intercept form
*December 28, 2014*

**Math**

Solve the system of two equations 2y=8 and 15y=2x-4
*December 28, 2014*

**math**

overnight the low temperature dropped to -6 degrees Fahrenheit. If the high temperature during the day was 11 degrees Fahrenheit, what was the difference between the high and low temperatures? Please help, thank you so much!
*December 26, 2014*

**Math**

the conductor looked at his pocket watch to see what time the train would be leaving. it read 8:37 pm. if it takes the polar express 3 hours and 15 minutes to get to the north pole, what time will it be when it arrives?
*December 21, 2014*

**Science**

Can an egg or sperm be formed through mitosis?
*December 18, 2014*

**L.A help please**

Thanks Ms. Sue! :)
*December 18, 2014*

**L.A**

Grace's answers are correct.
*December 17, 2014*

**Chemistry**

Thank you. You're the best the best the best.
*December 15, 2014*

**Chemistry**

2HCl+Pb(NO3)2---> PbCl2 (s)+2HNO3 Can you please tell why this is not an acid base reaction?
*December 15, 2014*

**Chemistry**

How do you know that a given reaction is not an acid base reaction? (apart from the fact that it should have an acid and a base and it should be a double displacement reaction)? I mean I know acids have protons (H+) and bases have hydroxides (OH-) but there are so many other ...
*December 15, 2014*

**Chemistry**

I have got the answer but can you explain me which formula you used after calculating q in part 1?
*December 15, 2014*

**Chemistry**

2C2H6+702---->4CO2+6H20 DELTAH= -3120.6 kJ/mol What mass of ethane must be combusted in order to heat 366 g of water from 25 degree celcius to 100 degree celcius? Assume the heat transfer is 100% efficient. a)44.1 g b) .903g c) 3.61g d) 2.21 g Should I approach this problem...
*December 15, 2014*

**AP Calc BC**

Solve the differential equation y'= radical(x)/(-3y) i made y' dy/dx and moved the y's to one side and the x's to the other, and ended up with y^2=(-4/9)x^3/2 + c, but i'm not sure if that's write, and is that the form i'm supposed to leave it in?
*December 15, 2014*

**AP Calc B/C**

The base of a solid is the region enclosed by y=x^3 and the x-axis on the interval [0,4]. Cross sections perpendicular to the x-axis are semicircles with diameter in the plain of the base. Write an integral that represents the volume of the solid. I drew a picture, but I ...
*December 15, 2014*

**Chemistry**

Got it. Thank you so much
*December 13, 2014*

**Chemistry**

Consider the thermal decomposition of potassium chlorate. 2 KClO3 (s)-----> 2 KCl (s) + 3 O2 (g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original mixture was KClO3? Is this how I should ...
*December 13, 2014*

**chemistry**

Is the total pressure 1 atm because the questions says STP?
*December 13, 2014*

**chemistry**

I used PV=nRT for both the gases but I am not getting the right answer. Please help
*December 13, 2014*

**chemistry**

Suppose 100 mL of NO at STP is mixed with 400 mL of O2 at STP. 2 NO (g) + O2 (g)---> 2 NO2 (g) After the reaction goes to completion, what is the partial pressure of NO2 in the resulting mixture of gases at STP? I know the relation between pressure and volume is P1V1=P2V2, ...
*December 13, 2014*

**chemistry**

In the context of chemistry and the periodic table , periodicity refers to trends or recurring variations in element properties with increasing atomic number . Periodicity is caused by regular and predictable variations in element atomic structure .
*December 13, 2014*

**math **

what are two fractions both not positive who has a product of 5/8
*December 13, 2014*

**Math**

You have an ear infection and are told to take a 200 mg tablet of ampicillin (a common antibiotic) four times a day (every six hours). It is known that at the end of six hours, about 5% of the drug is still in the body. What quantity of the drug is in the body right after the ...
*December 12, 2014*

**chemistry**

Calculate the amount of heat required to heat a 4.0kg gold bar from 20∘C to 61∘C. Specific heat capacity of gold is 0.128 J/g∘C. How do we figure this out?
*December 12, 2014*

**English**

B C B B
*December 11, 2014*

**please help (algebra)**

What is the error and correction in finding the difference? 3/4 - 9/2 = 3 - 9/4 - 2 = (-6/2) = -3
*December 10, 2014*

**Math**

I mean $10.00 for every oil change
*December 10, 2014*

**Math**

jody gets paid $200.00 per week, plus $100.00 for every oil change she completes. write the equation that shoes the relationship between the number of oil changes and her weekly income. then write the slope of the line that represents the relationship
*December 10, 2014*

**language arts**

The answer is D
*December 10, 2014*

**Calculus**

Find critical points for y'=2/3x^3-4x
*December 8, 2014*

**language arts**

The answer is C
*December 7, 2014*

**Chemistry**

estimate Delta H for the following reaction C2H4 (g)+3O2(g)→2 CO2(g)+2 H2O(g) So we have (4) C-H bonds and (1) C=C bond or (H = 4*414 + 615= 2271) For oxygen, (3) O=O bonds or (H = 3*502=1506) 2CO2 is (2) O=C=O (H=730*4=2920) 2H2O is (2) H-O-H or (H=4*464=1856) Delta H...
*December 7, 2014*

**chemistry**

6. Ligands approaching in a square planar pattern cause some orbitals to be raised in energy. How many orbitals are on the highest energy level? a. A) 1 b. B) 2 c. C) 3 d. D) 4 e. E) 5
*December 6, 2014*

**chemistry**

Conductivity experiments indicate that tetraamminedichloropalladium (IV) chloride is composed of 3 moles of ions per mole of compound. When silver nitrate solution is added to a solution of the palladium compound, 2 moles of silver chloride per mole of compound are ...
*December 6, 2014*

**Chemistry**

Consider the following data. DeltaHf (Na2O (s))=-414kJ/mol Delta H sublimation(Na)=109 kJ/mol I.E. (Na)=495 kJ/mol Bond Energy (O2) = 495 kJ/mol E.A. (O) = -141 kJ/mol E.A. (O -) = 878 kJ/mol Use this information to calculate the lattice energy of Na2O (s). So, we have the ...
*December 6, 2014*

**chemistry**

Consider the reaction: 2H2S(g)⇌2H2(g)+S2(g) An equilibrium mixture of this reaction at a certain temperature was found to have [H2S]= 0.542M , [H2]= 2.64×10−2M , and [S2]= 7.54×10−3M . What is the value of the equilibrium constant at this ...
*December 5, 2014*

**chemistry**

Write an equilibrium expression for each chemical equation involving one or more solid or liquid reactants or products. HCHO2(aq)+H2O(l)⇌H3O+(aq)+CHO−2(aq) Use A for [HCHO2], B for [H2O], C for [H3O+], D for [CHO−2].
*December 3, 2014*

**CHEMISTRY**

A solution with a pH of 7 has a [OH1-] of? 0M or 7M???????????????????
*December 3, 2014*

**chemistry**

7M??
*December 3, 2014*

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