Friday

April 18, 2014

April 18, 2014

Total # Posts: 68,163

**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?

**mathematics**

(x+3)(x+6)-2(x+1) Expand and simplify.

**Plays**

No, I mean are they fully capitalized? As in JENNIFER?

**Plays**

If a character mentions a person who is not a character in the play, is that name capitalized? For example: JOHN. I have to give the apples to Jennifer. Should Jennifer be capitalized even if she is not in the play?

**Chemistry **

What factors control the bond length in a covalent bond

**math**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground

**Math**

Does -7x^2+6x+3 have two real-number solutions?

**Algebra**

Do you mean 4*0.4? And how did you get positive 0.4? That was the part that confused me.

**Algebra**

How to solve y = -0.04x^2 + 1.3x + 56 using the quadratic formula?

**Algebra**

Solve the system of equations y=-2(x^2-1) y=2(x^4-2x^2 +1)

**AP Chemistry**

What is the entropy change for the vapor- ization of 2.2 mol H2O(ℓ) at 100◦C and 1 atm? H = 40700 J/mol.

**Algebra**

x+y^2=5 2x^2+y^2=6 Solve by elimination.

**Chemistry**

could it be at STP?

**Chemistry**

if a glass of ice water is at equilibrium, what is its temperature?

**Chemistry**

explain equilibrium in terms of the collision theory

**Plays**

So, basically character descriptions are not indented, right?

**Plays**

Are character descriptions such as the one below indented? [MARY looks nervous. She grabs her handbag and slowly leaves the house.]

**Plays**

When I'm writing the list of characters in a dramatic scene, are the names of the characters capitalized?

**Physics**

A stone is thrown in the air with an initial velocity of 50 m/s at 37 degrees to the horizontal. Find the total time the ball is in the air. What would be the total distance traveled?

**English**

If I wanted to describe the setting of a basketball court after a game, what are some things I might say?

**trigonometry**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground

**probability math question**

a bag contanins 7 red marbles, 2 blue marbles, and 1 green marble. What is the probabilty of choosing a marble that is not blue?

**Plays**

Can a dramatic scene about a conflict in the story have just two characters?

**math**

I am sorry because I am really bad at math!! But after multiplying, I got 254.15, then I subtracted that by 10.00 and I got 244.15 now? Can you please explain to me what I have done wrong? :(

**math**

I got $15.41?

**math**

Anthony went to the store to buy soda. There was a sign that said, "15% off." The soda eas priced at $2.99 How much did the soda cost Anthony? If Anthony paid with a ten dollar bill, how much change did he recieve?

**Chemistry**

How to use the octet rule to predict the formula of the simplest compound formed from hydrogen and selenium, (Write the formula with hydrogens)?

**Chemistry **

What factors control the bond length in a covalent bond? Select all that apply. -It involves the attraction between the two nuclei involved in the bond. -It involves the attraction between the electrons in the bond and the nuclei of the atoms. -It involves the repulsion betwee...

**Chemistry**

Oo the solids have a delta G of zero!!!!

**Dramatic Scene**

If I have three characters in each column, then how would I follow those instructions?

**Dramatic Scene**

The thing is that my teacher said that the characters should come out in the order the come in the play, so it seems unclear about how to follow these instructions if I show the characters vertically.

**Dramatic Scene**

When writing a script for a dramatic scene, are the characters listed horizontally or vertically?

**Science**

1. Which of the following describes an example of land reclamation? A. After an area is mined for copper, the soil is replaced and new plants are planted B. After a forest is clear-cut, desertification occurs C. After a forest is clear-cut, it is mined for copper D. After an a...

**chemistry**

1. When performing this experiment, a student mistakenly used impure KHP to standardize the NaOH solution. If the impurity is neither acidic nor basic, will the percent by mass of acetic acid in the vinegar solution determined by the student be too high or too low? Justify you...

**math word problems**

A black pole 3 yd 2 ft long was 2 ft longer than a white pole. When part of the black pole was cut away, it was 1 yd 1 ft shorter than the white pole. How much of the white pole was cut away?

**Chemistry for health science**

Considering the neutralization reaction when nitric acid reacts with solid iron(II)carbonate. What is the minimum volume of 2.00 M HNO3 necessary to react completely with 1.06 kg of solid iron(II) carbonate, FeCO3 ?

**physics**

a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration

**Exposition: How-to Essay (Writeacher)**

Should I write my essay in this format? 1. Determine your dominant eye (the eye from which one prefers to receive visual input). While this action might have been what you least expected, by determining your dominant eye, you will ultimately improve your accuracy and your abil...

**Exposition: How-to Essay (Writeacher)**

I have been assigned to write a 3-paragraph how-to essay. Should I number each paragraph? If not, why?

**economics**

2750?

**Acne**

Where is my post? Did someone remove it? :( :(

**physics**

See Previous Questions: Fri,3-21-14, 8:55PM.

**PLG 209**

Summarize the Bill of Rights (and Amendments 13-15). Discuss why they apply to criminal law

**english**

What are some websites that are against animal abuse & the actions they have taken to stop it. Thank you!

**Chemistry**

thank you

**Chemistry**

and if the salt would only be slightly soluble then it would still not be at equilibrium, correct?

**Chemistry**

an extremely soluable salt is added to water, and all of it dissolves. is it at equilibrium? explin.

**Math**

Solve the system using elimination. y = -x + 3 y = x^2 + 1

**Algebra**

Thanks!

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