Wednesday
April 23, 2014

Posts by anonymous


Total # Posts: 68,354

College Gen.Chemistry
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and u...

Geometry
Find the midpoint of the segment with the given endpoints. M(–2, 1) and O(–3, 2)

Math
A 3-foot piece of wood is cut into two equal sections. How long is each section in inches? a. 9 inches b. 18 inches c. 27 inches d. 36 inches

College Chemistry (DrBob222)
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

College Gen. Chemistry - Science
Dear Dr Bob222, Thank you so much! The answer is 35.5 mL on H2O has evaporated.

College Gen. Chemistry - Science
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

physics
a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?

Ms. Sue?
Ms. Sue?

Literature/Social Studies (Ms. Sue!)
I have been trying to think but, no matter how many times I read Kennedy's speech, I struggle to answer this question.

Ms. Sue?
Ms. Sue?

Literature/Social Studies (Ms. Sue!)
Oh. Alright. I need to hurry, though.

Literature/Social Studies (Ms. Sue!)
Was #2 incorrect? Also, what might the answer be for number #4?

Literature/Social Studies (Ms. Sue!)
Thank you so much! Could you also evaluate my how-to essay? I would truly appreciate it if you could.

Literature/Social Studies (Ms. Sue!)
The New Frontier" by John F. Kennedy. 1. What ideas does Kennedy express by quoting William Brandford? A: By quoting William Bradford, Kennedy expresses the idea that, despite great difficulties, man can overcome anything through their will and determination. 2. What reas...

Please, I must hurry!
I need to leave soon.

How-To Essay Evaluation (Writeacher)
Writeacher, are you able to help me?

How-To Essay Evaluation (Writeacher)
No, I have only been assigned to write a 3-paragraph ho-to essay.

How-To Essay Evaluation (Writeacher)
What do you think? "In order to shoot a bow accurately, the first step to take is to determine your dominant eye (the eye from which a person prefers to receive visual input). While this action might have been what you least expected, by determining your dominant eye, you...

Math
Find the radius of a circle so that it's area and circumference have the same value.

Ms. Sue?
Ms. Sue?

Literature/Social Studies
Thank you so much! However, are my other answers correct? I also don't know the answer to the second question in #4.

Literature/Social Studies
No matter how many times I studied the third paragraph, I still don't know.

HELP ME!
Please, help me!

Literature/Social Studies--Please, help me!
Please, help me!

Literature/Social Studies
1. By quoting William Bradford, Kennedy expresses the idea that, despite great difficulties, man can overcome anything through their will and determination. 2. Kennedy offers reasons such as the task of going to the moon being difficult, the goal serving to organize and measur...

Literature/Social Studies
Yes, one of the links does. The speech is called "The Rice Moon" by John F. Kennedy.

Literature/Social Studies
Kennedy gave this speech in 1962 in Huston, Texas at Rice University.

Literature/Social Studies--Please, I have to leave soon!
Please, help me!

Literature/Social Studies
"The New Frontier" by John F. Kennedy. 1. What ideas does Kennedy express by quoting William Brandford? A: ? 2. What reasons does Kennedy offer for going to the moon? A: Kennedy offers reasons such as the task of going to the moon being difficult, the goal serving to...

geometry cumulative
A cylinder’s radius is reduced to 2/5 its original size and the height is quadrupled. How has the volume of the cylinder changed?

Math
Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4y-z=8.3 A) x = -2.125, y = 3.23, and z = 4.555 B) x = 1.661, y = 2.509, and z = 0.404 C) x = 2.509, y = 1.661, and z = -0.404 D) x = 0.260, y = 2.435, and z = 1.375 E) x = 2.435, y = 1.375, and z = 0...

grammar
hey.. can u do 3 sentences for my homework.. put from direct to indirect speech.. 1)'I've got plan I and know we can killl the Ice-Man!' 2)'The show is minning overtime. Peter please, could you speed up?' 3)'Come on Steve, you can do it! Jump!'

HEALTH
Words and Definitions that go along with the std chlamydia?

Geometry B
The equation x2 + y2 − 2x + 2y − 1 = 0 is the general form of the equation of a circle. What is the standard form of the equation?

Physics
In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on the journey out, the same for return, \plus 455 days waiting at Mars while the planets crawled back into positions for the return orbit." Show that travelers would have to wait ...

discrete mths
Two dice, one red and one white are rolled. What is the probability that the white die turns up a smaller number than the red die ?

Convert fraction decimal and percent
On Friday math test. will missed 5 problems out of 25. If each problem was equally weighted, what was will's grade on the test? A. 20% b. 75% c. 80% d. 85%

Physics
A series RCL circuit contains only a capacitor (C=6.60 F), an inductor (L=7.20 mH), and a generator (peak voltage=32.0 V, frequency=1.50x10^3 Hz). When t  0 s, the instantaneous value of the voltage is zero, and it rises to a maximum one-quarter of a period later. (a) ...

French
What is the difference between "rue" and "roue" in pronunciation?

Pre-Calc
How would you go about finding all the solutions of the equation. I just don't know where to start. 2cos2theta-root3=0

Puncuation
How should I revise this sentence, then?

Puncuation
Does this sentence require any improvements in terms of punctuation? I think Hansberry means that summer is honorable in terms that this season does fulfill wishes and dreams like she had been told; Hansberry’s wish being that the dying woman could live to see “at le...

physics
A compact disk player has just been turned off. A disk decelerates uniformly from an initial angular velocity of 7.90 rev/s. The disk rotates through 5.50 revolutions before coming to rest. What is the tangential acceleration of a point on the disk 5.05 cm from the axis?

math
Sonya spent 2/5 of her money and then had $18 left. How much money did Sonya originally have?

Finance
eef

stats
Five percent of all items sold by a mail-order company are returned by customers for a refund. Find the probability that, of two items sold during a given hour by this company, neither will be returned for a refund.

Physics
A wagon is coasting at a speed vA along a straight and level road. When twenty-five percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which this mass is thrown is ex...

Physics
A box of mass 54.0 kg is sitting on a ramp which makes an angle of 37.0 degrees with respect to the horizontal. The coefficient of friction between the box and the ramp is 0.21. This box is connected by a massless string over a pulley at the top of the ramp to a second box wit...

Physics
A box of mass 50.0 kg is connected to a second box with a mass of 54.0 kg. Both are sitting on a horizontal surface and the coefficient of kinetic friction between the surface and each box is 0.51. If the second box is pulled away from the first box with a force of 605.8 N, fi...

Water cycle question
Explain why residence time in the atmosphere for water is short but the flux in and out of the atmosphere is huge.

Water cycle question
The planet is covered by 97% ocean water. What would the global water cycle look like if the earth were covered by 50% ocean water?

Physics
Two boxes of mass 7.40 and 7.00 kg are in contact and are accelerated across a horizontal surface by an force of 51.49 N applied parallel to the surface and pushing on the lighter box. The magnitude of the frictional force between the surface and the lighter mass is 9.26 N and...

Physics
Two blocks of weights 77.0 and 114.0 N are connected by as massless string and slide down an inclined plane making an angle of 45.0 deg. to the horizontal. The cofficient of kinetic friction between the lighter block and the plane is 0.15 and that between the heavier block and...

math
mr andropolis wants to leave the waitress a 12% tip. estimate the tip he should leave if the family's bill is $32.46

Implicity
Find dy/dx implicitly in terms of x and y only for the following function; X+4xy=y^2

Calculus A
Find all relative extrema and points of inflection for the following function... h(X)= X^2+5X+4/ X-1 min= max= inflection points=

math
7^n =7^5=16807

Physics
A 115.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 46.0 deg with the horizontal.what is the magnitude of the normal force between the ramp and the box? The applied force= 1167.04N

math
3/4 as decimal

math
0.7 as a fraction

math
Yes. Thank you!

math
0.6 as a fraction

math
0.625 as a percent

Algebra 1 Answer Evaluation
Factor. 1. 30y^3 - 50y A: 10y(3y - 5y) 2. Factor a^2 - 5a^2 + 2a -10 by grouping. A: ?

math
0.6 as a percent

math
1/2 as a decimal

math
2/5 as a decimal

math
0.25 as a fraction

6th gr. math
0.2 as a percent?

Math
I do wish I had a tutor but right now my family doesn't have an income and I can't pay for a tutor. Since I live in Costa Rica everything here is expensive.

Math
I have reviewed the lesson that explains this three times, but I have ALWAYS had a hard time with Math and this is Pre-Cal. And I get so frustrated that I start to cry!!!! URRRGGGGHHHH!!!!

Math
Given the following function, choose the graph with the two possible angles with the domain 0 < or = to theta < or = to 360 degrees. Sec(theta)= -13/5

math
0.125 as a percentage?

math
1/20 as a fraction?

Algebra 1 Answer Evaluation
Factor the following polynomial completely. "3c^2 + 12 - 63" My answer: (3x +9)(x - 7)

Englisj
No, using a simile would not waken or negate The poem because the way it is stated already Uses simile when it says , "Life without dreams Is like a broken-winged bird"

Englisj
In Langston Hughes poem, Dreams, Would using a simile rather than a metaphor Negate or weaken Hughes' poem?

Macroeconomics
A key determinant of the price elasticity of supply is

English
Need an example of an analogy that has to do with migration is like a vacation. Don't have any idea!!! I am lost on this one Maybe "Vacation is like a migration to a tropical island"

science
mountains that are formed between two large faults are known as a. seamounts b. uplifted mountains c. plateaus d. fault-block mountains

Chemistry: Check my answers?
Write “yes” or “no” below if the chemical equation is balanced or not. 1. 2H2 + O2 ---> 2H2O 2. S8 + 12O2 ---> 8SO3 3. HgO ---> Hg + O2 4. Zn + HCl ---> ZnCl2 + H2 5. 2Na + 2H2O ---> 2NaOH + H2 6. 2Al + 3FeO ---> Al2O3 + 3Fe 7. 4Si2H3 + 11...

chemistry
Distilled water normally contains dissolved CO2. When preparing NaOH standard solutions, it is important to use CO2 free distilled water. How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution’s concentration?

physics
a wheelof diameter 0.70 meterolls without slipping. a point at the top of the wheel moves with a tangential speed of 2.0 meter/second. a) at what speed is the axis of the wheel moving? b) What is the angular speed of the wheel?

Math
For z1 = 4cis (7pi/6) and z2 = 3cis(pi/3), find z1 * z2 in rectangular form.

Math
Convert theta = 225° to rectangular form. A) y = -1 B) y = 1 C) y = x D) y = -x E) x = -1

Math
What is the exact value of sin(2 theta) if cos theta= 3/5 and theta is in quadrant IV?

Math
Which expression is equivalent to sin(3x) + sin x? A) 2cos(2x)sin x B) 2sin(2x)sin x C) -2sin(2x)cos x D) 2sin(2x)cos x E) -2cos(2x)sin x

help
Sara runs several times a week and always keeps track of how much time she runs each time she goes out. One day she forgets to take her stopwatch with her and wonders if she can still have some idea of her running time. As she passes a particular pond, she remembers that it is...

Math - PreCalc (12th Grade)
Which rectangular equation corresponds to these parametric equations? x = 0.2sec t and y = -0.25tan t A) 25x^2 − 16y^2 = 1 B) 25x^2 + 16y^2 = 1 C) x^2 − 16y^2 = 25 D) 25y^2 − 16x^2 = 1 E) 4x^2 − 16x^2 = 1

Math - PreCalc (12th Grade)
How many different basketball teams of 5 players can be created from a group of 7 players?

PRE-CALC
At how many points is this function discontinuous? f(x)=(2(x − 1)(x − 4))/((x + 2)(x − 5)) A) one B) two C) three D) four E) five

PRE-CALC
A biased coin has a 0.4 probability of landing on tails. The random variable X, based on a single toss of the coin, is defined as follows: X = 0 if heads appears; X = 1 if tails appears. What is the mean value of X? A) 0.7 B) 0.5 C) 0.4 D) 0.3 E) 0.6

Math - PreCalc (12th Grade)
Which equation represents a hyperbola whose foci lie at (2, 7) and (2, -3)?

HELP PRE-CALC ASAP
An experiment consists of selecting a number at random between 0 and 9 inclusive, and a letter of the English alphabet. What is the size of the sample space of this experiment? A) 35 B) 36 C) 52 D) 234 E) 260

Math
An astronomical researcher is using software to study the parabolic path of an asteroid. By entering the equation for the path of the asteroid, the researcher could determine if the asteroid would collide with any other bodies in the near future. The equation for the asteroid&...

chemistry
Distilled water normally contains dissolved CO2. When preparing NaOH standard solutions, it is important to use CO2 free distilled water. How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution’s concentration? would it be too...

chemistry
2. When preparing a NaOH solution, a student did not allow the NaOH pellets to completely dissolve before standardizing the solution with KHP. However, by the time the student refilled the buret with NaOH to titrate the acetic acid, the remaining NaOH pellets had complet...

stats
X is normally dsitributed with mean 250 and standard deviation 40. what value of X does only top 15% exceed?

Chemistry
How many moles of hydrochloric acid are required to react with 2.57 moles of calcium hydroxide in a neutralization reaction?

Trig - sum and difference formulas
Write the expression as a single trigonometric functions: cos 6x cosx - sin6x sin x if you could do it step by step? also... How do I prove that sin(90deg + theta) = cos(theta)?? also step by step so i may learn?

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