Saturday

March 28, 2015

March 28, 2015

Total # Posts: 1,579

**Chemistry**

A 3.0g sample of NaCl is added to a Styrofoam cup of water, and the change in water temperature is 6.5∘C . The heat of solution of NaCl is 3.76 kJ/mol. What is the mass (in g) of water in the Styrofoam cup?
*March 24, 2014*

**Chemistry**

Acetylene(C2H2) torches are used in welding. How much heat (in kJ) evolves when 2.0L of C2H2 (d=1.0967kg/m3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is C2H2(g)+52O2(g)→2CO2(g)+H2O(l), ΔH∘=−1299.5kJ
*March 24, 2014*

**English**

Is the comma in the right place below? Did you know, Dad, that the the colonists broke all the treaties signed by Philip and his father? Do the commas go there because to set off a nonessential appositive?
*March 24, 2014*

**science**

That only one phenotype would have been produced without change.
*March 14, 2014*

**integrated science**

find the resultant force on a .150kg baseball if gravity is pulling down and it is hit at a 45 degree angle with 50N of force by a baseball bat.
*March 9, 2014*

**science**

the core turns in to a white dwarf. So go from there .
*February 28, 2014*

**history**

Which of the following is true of the Industrial Workers of the World (I.W.W.)? A. It was founded in Russia. B. It made business leaders create new methods to deal with labor issues. C. It had very little influence over the labor movement. [D. It was devoted to organizing ...
*February 25, 2014*

**Math**

Pilar picked 12 apples.she gave 1/4 to Dwayne 1/4 tot Murphy and 1/4 to Kelley .how many apples did each get
*February 18, 2014*

**English**

Can you check these? Neither the tourists nor their guide has/have time to photograph the gazelle? I think has because guide is singular. Neither my spaniel nor my neighbor's terriers do/ does tricks. I think do because terriers is plural.
*February 9, 2014*

**English**

Which verb should I use and why? Either the wild dogs or the baboon makes or make that howling sound. I think since dogs is plural it should be make?
*February 9, 2014*

**Chemistry**

Suppose a student titrates a 10.00-mL aliquot of saturated Ca(OH)2 solution to the equivalence point with 13.65 mL of 0.0234 M HCl. What was the initial [OH − ]? What is the experimental value of Ksp?
*February 5, 2014*

**physics**

a block with a velocity 4m/s slides 8m across a rough horizontal floor before coming to rest.the coefficient of friction is.
*January 27, 2014*

**MATH Fractions**

tony has 15 pennies in his pocket. 5/8 of his coins are pennies. how many coins does tony have in his pocket?
*January 26, 2014*

**Fractions**

thank you very much
*January 26, 2014*

**math**

a region has 12 equal squares, what is the number of squares in 1/3 of the region
*January 15, 2014*

**English**

How about this one? During the next few days, I would explore the city. Preposition is during and object is days?
*January 13, 2014*

**English**

Window and right? Should I include the as the object of the preposition?
*January 13, 2014*

**English**

Out in the first one To in the second one?
*January 13, 2014*

**English**

I think window or the window for the first one I think the right or just right for the second one?
*January 13, 2014*

**Science**

I do connections to!!!!!!
*January 13, 2014*

**Science -- I can't find my original post...**

In a closed room with an electric system controlled by a thermostat, would hanging a load of laundry to dry in that room require the system to work harder to maintain the temperature of the room?
*January 9, 2014*

**English**

Last one, The flood destroyed everything in its path. Any predicate adjectives?
*December 15, 2013*

**English**

In this sentence, When the dam broke, it sounded explosive. Is explosive an adverb or an adjective?
*December 15, 2013*

**English**

Water rose almost to the top of the dam. Is the a predicate adjective?
*December 15, 2013*

**math**

jenna has two lengths of ribbon, one 24 inches one 36 inches. she want to cut the ribbon inot equal lengths and not have any left over. what lengths can she cut the ribbon?
*December 12, 2013*

**English**

What are the adjectives in this sentence? Many families headed for a favorite beach last week during the hot weather. Many, a, favorite, last, the, hot
*December 4, 2013*

**Chemistry**

Thank you DrBob, that helps a lot!
*December 3, 2013*

**Chemistry**

Two competing corporations are submitting data to the US Military to create chemical hot packs. The Military has stipulated that each hot pack may cost no more than 85 cents and must result in at least a 20degrees Celsius rise in temperature when activated. Which of the ...
*December 3, 2013*

**history**

Oppresionists
*November 29, 2013*

**Calculus Area between curves**

Consider the area between the graphs x+6y=8 and x+8=y2. This area can be computed in two different ways using integrals First of all it can be computed as a sum of two integrals where a= , b=, c= and f(x)= g(x)= I found a, but not b or c. I can't seem to figure out f(x) ...
*November 24, 2013*

**Calculus Area between curves**

Evaluate the definite integral: sqrt(8-2x) lower limit=-7 upper limit=0 I got -(1/3)(8-2x)^(3/2) and it was wrong. Please Help! Thanks in advance!
*November 22, 2013*

**Calculus**

Yes I figured it out thanks
*November 21, 2013*

**Calculus**

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. x+y^2=42, x+y=0
*November 21, 2013*

**English**

Which word fits these sentences? A Persian rug with beautiful patterns lay/laid on the floor. I think lay for present tense? The temperature has raised/risen four degrees in the past hour. I think risen because there is no object?
*November 19, 2013*

**English**

One more... After the ceremony, the queen lay/laid her crown in its glass case. I think laid for past tense.
*November 19, 2013*

**English**

Which word fits these sentences? A Persian rug with beautiful patterns lay/laid on the floor. I think lay for present tense? The temperature has raised/risen four degrees in the past hour. I think risen because there is no object?
*November 19, 2013*

**English**

Which word fits these sentences? A Persian rug with beautiful patterns lay/laid on the floor. I think lay for present tense? The temperature has raised/risen four degrees in the past hour. I think risen because there is no object?
*November 19, 2013*

**English**

I think he learned and had been waiting.
*November 18, 2013*

**English**

What about these? In 1919 he learned/is learning about a contest in which he could win $25,000. People in Paris had been waiting/will have been waiting for him for hours, and they met his plane with a huge celebration.
*November 18, 2013*

**English**

Which words go in the following sentences. Young Charles was born in 1902 and was growing/grew up on a farm. Later, although he has studied/had studied engineering in college, he was more interested in flying planes.
*November 18, 2013*

**English**

In the sentence They are not nuts. They is the subject Are is the verb What is the predicate word?
*November 12, 2013*

**HCS/335**

How might you apply ethical philosophies and principles that summarize what you perceive to be the top five ethical issues challenging health care delivery today?
*November 9, 2013*

**Science**

When you inhale, where is there more oxygen, in the lungs or body.
*October 31, 2013*

**Math **

I would just like someone to check my work and make sure I am doing it correctly before I continue. f(x)=x^2-3x+5 1. f(2) I got f(2)=-7 and g(x)=5x-1 1.g(-3) I got g(-3)=-16 Thanks for any help!!
*October 31, 2013*

**Beginner Spanish**

I need help please Complete the sentences with the correct forms of conseguir, ir, pensar, querer, or suponer. Nosotros _______ de excursión a las montañas, Toño. ¡Yo____ que vas a dormir todo el fin de semana! No, Carmen. No voy a dormir. Voy a ver ...
*October 28, 2013*

**English**

How about these? Most of the students prefer acting as his or her/their best job. His or her?
*October 27, 2013*

**English**

Both plural so top one their and bottom one they? I thought each was singular?
*October 27, 2013*

**English**

Which pronoun? That is the month many of the classes put on its, their own plays. Easpch of the classes chooses the play they, it will put on.
*October 27, 2013*

**Math**

You need to put carpet in a rectangular room that measures 12 feet by 17 feet at a cost of $27.50 per square yard. Assuming that you can buy precisely the amount of carpet you need, how much will the carpet for the room cost? I came up with $1870.00 but Im, not sure if I am ...
*October 27, 2013*

**Science- DrBob222**

soo what is the answer ?
*October 26, 2013*

**math**

012,456,789,109,876,543,210
*October 25, 2013*

**Calculus Homework**

You are blowing air into a spherical balloon at a rate of 7 cubic inches per second. The goal of this problem is to answer the following question: What is the rate of change of the surface area of the balloon at time t= 1 second, given that the balloon has a radius of 3 ...
*October 16, 2013*

**Calculus Practice Problems**

A filter filled with liquid is in the shape of a vertex-down cone with a height of 12 inches and a diameter of 18 inches at its open (upper) end. If the liquid drips out the bottom of the filter at the constant rate of 3 cubic inches per second, how fast is the level of the ...
*October 16, 2013*

**Calculus Practice Problems**

A boat is pulled into a dock by a rope attached to the bow (front end) of the boat and passing through a pulley on the dock that is 4 m higher than the bow of the boat. If the rope is pulled in at a rate of 3 m/s, at what speed is the boat approaching the dock when it is 8 m ...
*October 16, 2013*

**Calculus Homework**

Let A(t) be the (changing) area of a circle with radius r(t), in feet, at any time t in min. If the radius is changing at the rate of dr/dt =3ft/min, find the rate of change of the area(dA/dt) at the moment in time when r = 16 ft dA/dt=
*October 15, 2013*

**Science**

thanks are u sure there right before i turn them in?
*October 8, 2013*

**physics**

An astronaut wearing a 20-kg spacesuit jumps on the moon with an initial velocity of 16 m/s. On the moon, the acceleration due to gravity is 1.62 m/s squared. What is the maximum height he reaches?
*October 7, 2013*

**physics**

An astronaut wearing a 20-kg spacesuit jumps on the moon with an initial velocity of 16 m/s. On the moon, the acceleration due to gravity is 1.62 m/s squared. What is the maximum height he reaches?
*October 7, 2013*

**Math**

A discount store marks up the merchandise it sells by 55%. If the wholesale price of a particular item is $25, what should the retail price be set at?
*October 5, 2013*

**Psychology**

What are some examples of an agonist?
*October 3, 2013*

**Math**

Use Distributive Property. a(b+c) = ab + ac
*October 1, 2013*

**4th grade math**

I have letters representing each species. Replace each letter with the number representing the specie. There are 62 Clams. There are 70 Fish. C=62 B= 14+C M= 14+C-9 F=70 I= 1/2*F R= 1/2*F-21 S= 1/2*F-21+10
*October 1, 2013*

**algebra**

7^3 is 7 multiply by itself 3 times 7*7*7=x 7^9 is 7 multiply by itself 9 times 7*7*7*7*7*7*7*7*7=y You take the answer from 7^3 (x) and multiply it with 7^9 (y) and you get the answer.
*October 1, 2013*

**Math**

When it says more than it's addition so the equation is 0.25x+2=6 Then you subtract 2 from both side leaving 0.25x = 4 and then divided by 0.25 to get x by itself and then there's your answer!!
*October 1, 2013*

**physics**

It's an upside down trapezoid. with 50 degrees on the left top corner. a 43 degrees on the right top corner. T2 which is 61N is the shorter line on the bottom on the trapezoid. and M1 is hanging on T2 left side and M1 is hanging on T2 right side. Does that make sense?? ...
*October 1, 2013*

**physics**

The left-hand cable has a tension T1 and makes an angle of 50 degree with the horizontal. The right-hand cable has a tension T3 and makes an angle of 43 degree with the horizontal. A W1 weight is on the left and a W2 weight is on the right. The cable connecting the two weights...
*October 1, 2013*

**Chemistry**

K2SO4+ Na2HPO4=? NaHCO3 + Sr(NO3)2=?
*September 29, 2013*

**Chemistry**

CuSO4+LiNo3 Potassium sulfate+lithium nitrate Can someone help me figure out the equations for these two? Phases aren't required
*September 29, 2013*

**Math**

Steve mcspoke left home on his bike traveling at 18km/hr. Steve's brother set out 2 hours later , following the same route, TRAVELING 54 per hour. How long did brother have to travel to catch up with Steve?
*September 22, 2013*

**Math**

Is it 15kmper hour?
*September 22, 2013*

**Math**

Rod and John ride their bikes in opposite directions. Rod ride 5 miles an hour faster than john. After 2 hours, they are 70 miles apart. How fast is john biking?
*September 22, 2013*

**statistics**

I get .27 but that's not an answer choice.
*September 16, 2013*

**statistics**

Based on published real estate research, 65% of homes for sale have garages, 20% have swimming pools, and 18% have both features. i. Given that a home for sale has a garage, what’s the probability that it also has a pool
*September 16, 2013*

**statistics**

I got 2 percent for number two. But I can't solve for number one. Is it 60%?
*September 16, 2013*

**statistics**

You and your friend decide to get your cars inspected. You are informed that 70% of cars pass inspection. If the event of your car’s passing is independent of your friend’s car: iii. What is the probability that both of the cars pass inspection (6 points)? a. 60% b. ...
*September 16, 2013*

**Chemistry**

Expected number of moles of copper oxide (using the emprical formula of copper oxide and the starting moles of Cu)
*September 15, 2013*

**Chemistry**

Moles of Cu in the copper sulfate salt: mass is 90. and there are 5g of copper sulfate
*September 15, 2013*

**Chemistry**

Calculate the moles of O in 2.57g of Ba(No3)2 I get 33.2m
*September 12, 2013*

**Chemistry**

On an alien planet, volume is measured in units of smaugs (S) and odahviings (O), where 1 S = 2.25 O. By some weird coincidence, they use the exact same metric system that we use. Knowing this, how much is 500.0 O in units of kS
*September 12, 2013*

**Pre-calc**

Let p(x,y) be a point on the graph of y= X^2-3 A) Express the distance from P to the point (1,2) as a function of x. Simplify completely. B) Use your calculator to determine which value of x-yields the smallest d.
*September 10, 2013*

**Pre-calc**

a rectangular yard is to be enclosed by a new fence on 3 sides and by an existing fence on the fourth side. the amount of new fencing to be used is 160 feet
*September 10, 2013*

**Pre-calc**

a rectangular yard is to be enclosed by a new fence on 3 sides and by an existing fence on the fourth side. the amount of new fencing to be used is 160 feet
*September 10, 2013*

**Pre-calc**

find a possible polynomial equation of degree 4 if the zeroes are -1,2, and 5, the graph touches the x-axis at -1 but does not cross through, and the y intercept is -5
*September 10, 2013*

**Chemistry**

I don't really understand how you got this answer.
*September 7, 2013*

**Chemistry**

Calculate the theoretical mass percent of oxygen in KClO3. here is the my mass percentage of 02 25gKCl03/30.0gKCl03=0.61%02.
*September 7, 2013*

**Math (Pre-calc)**

1) F(x)= (X+2)/(X^2-4x-5) A) Find the domain (-00,-1)u(-1,5)u(5,00) B) find F(-3) I'm not sure how to do it. C) Find F(X+2) I'm not sure either. 2. f(x)= (2x)/(x-4) G(x)= (x)/(X+5) find the domain of each. A)(F+G) (4x^2+5x)(x-4)(X+5) x can't= 4,-5 B) (F*G) (2x^2)/(...
*September 5, 2013*

**Calculus **

The region bounded by y=-x^2+14-45 and y=0 is rotated about the y-axis, find the volume.
*September 5, 2013*

**Chemistry**

They are both 1Mole
*August 26, 2013*

**Chemistry**

How much solid product formed with 30ml of NaOH and 40mL of NiCl2? I'm not really sure how to go about this?
*August 26, 2013*

**Math**

Any help would be appreciated. This is for my study guide in order to do well on my test. Someone please help.
*August 22, 2013*

**Math**

Solve the system of equations 3x-y=11 -5x+y=12 2. Perform the indicated operation and simplify (5/(x-2)+(4(x^2-2x) 3.simpify and write with only positive exponents (7x^3y^-2)/(x^-4y^9)^-3 4. find the solution of the inequality 2x-11 is less than or equal to -4(5x-3) 5. the ...
*August 22, 2013*

**math**

2(x-3/4)+3(x+2/3)+4(x-1/5)=9x+17
*August 19, 2013*

**SAT math**

If the ratio of blue balls to red balls is 2.5 to 4, and there are 25 blue balls, how many red balls are there?
*August 13, 2013*

**English**

Words with the root sid: 1. President 2. Reside 3. Residence 4. inside 5.preside Potation: The act of drinking something *Unfortunately I can't explain your "Insidious" issue
*August 13, 2013*

**Chemistry-Please help!**

In a concentration cell, what would be the potential if we studied two solutions that had the same concentration?
*August 12, 2013*

**Chemistry- Please Help!!**

Acetic acid has a Ka = 1.75 x 10-5 and formic acid has a Ka = 1.8 x 10-4. Which is the stronger acid?
*July 31, 2013*

**Chemistry- Please Help!!**

If a 0.10 M solution of an acid has a pH of 4.5, what would be the predicted pH of a .10 M solution of the conjugate, and why?
*July 31, 2013*

**Chemistry- Please Help!!**

according to lechateliers principle, would increasing the starting concentration of Ca2+ increase or decrease the amount of Ca(IO3)2 that dissolves???
*July 28, 2013*

**Chemistry- Please Help!!**

Predict the proper equilibrium constant expression for the following reaction... Fe(OH)3(s) ----> Fe3+(aq) + 3 OH-(aq) Explain the reasoning behind your answer.
*July 27, 2013*

**Mass Media Public Law**

In the aftermath of the 9/11/2001 terrorist attacks on America, and the resulting War on Terrorism by the United States, what do you think is the reasonable and legal limitations on the First Amendment?
*July 13, 2013*

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