Wednesday
April 16, 2014

Posts by Rob


Total # Posts: 330

College Physics
1/2 P(intitial)

trig
find the exact value of cos(theta) if the terminal side of angle(theta) contains the point (-3,5)

8th grade
a rabbit can climb one or two steps at a time on a ten step staircase, but he never goes back down. In how many different ways can the rabbit climb a flight of ten steps

Trigonometry
A little boy is flying a kite. The string of the kite makes an angle of 30 dgrees with the ground. If the height of the kite is h equals 15 m, find the length (in meters)of the string that the boy has used.

Trigonometry
i dont know..i just need help.

Trigonometry
i dont know..i just need help.

Trigonometry
i dont know..i just need help.

Trigonometry
A pole with a height of 60 ft. has a shadow of length of 34.64 ft at a particular instant of time. Find the angle of elevation of the sun at this point of time.

american government
what two actions could congress take to undo a supreme court ruling that a federal law is unconstitutional? explain the advantages and disadvantages of each action?

AMERICAN GOVERNMENT
EXPLAIN PRESIDENTIAL SUCCESSION STEPS.

AMERICAN GOVERNMENT
THREE CONSTITUTIONAL REQUIREMENTS TO BECOME PRESIDENT OF THE U.S.?

AMERICAN GOVERNMENT
LIST 6 MAJOR ROLES OF THE PRESIDENT?

AMERICAN GOVERNMENT
LIST FOUR FACTORS AFFECTING VOTER TURNOUT?

physics
9.8

american government
LIST FOUR FACTORS AFFECTING VOTER TURNOUT?

Chem answer check
Do these look right? What shape does an ammonia (NH3) molecule have?trigonal pyramidal In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none In a polar bond, electrons are? completely transferred What determines the polarity o...

Algebra
factor the expression csquared + 10c + 25

Algebra
csquared + 10c + 25 factor the expression...

Programming
Here is the source code for the Kitty class: public class Kitty { String name; int age; public Kitty(){ } public void setName(String n){ name = n; } public String getName(){ return name; } public void setAge(int a){ age = a; } public int getAge(){ return age; } } 1) The array ...

physics
Sorry i see the mistake I made for m the acceleration would be negative since its moving down

physics
from the FBDs wouldnt u get for M: Fy = N-WM=Ma Fx=T=Ma for m: Fy= T-Wm=ma Fx= T-W=ma then solve for a in M of Fx and sub a into m of Fx to get T?

Geometry
I need to invest on that calculator thanks Kerri

Geometry
that explains it better thanks Reiny

Geometry
what is the formula or how did you get that answer?

Geometry
The sides of a square each measures 4 ¾ inches. Find the area of the square as a fraction or mix number. (Do not use decimals)

Grammar
Are the following sentences punctuated correctly? Although, there is no definite evidence of malignancy, a biopsy should still be performed. He is incidentally, allergic to contrast material. Surgery, is not in my opinion indicated at this time.

Grammar
Are the following sentences punctuated correctly? The lung exam showed no rales, rhonchi or wheezes. She has a history of cough, not productive, that keeps her awake at night. The patient is a well-developed, well-nourished, badly sunburned cantankerous white male.

science
because it has a lot of gas in it??

science
which of the following is formed from molten rock that contains large amounts of gasses?? A: Rhyolite B: granite C:basalt D: pumice

Algebra
How do I do radical 7/10... my answer was 4 radical 3 over 6... is that correct?

MATH
24 pages

College Chemistry
[H30+] = 10^-(pH goes here) A log is an exponent. Since pH is a negative log, it's an exponent with a negative sign on it (with an implied base of 10).

Econ
In which of the following circumstances would a buyer be indifferent about buying a good? a. The amount of consumer surplus the buyer would experience as a result of buying the good is zero. b. The price of the good is equal to the buyer's willingness to pay for the good. ...

Econ
A result of welfare economics is that the equilibrium price of a product is considered to be the best price because it a. maximizes total revenue for firms and maximizes the quantity supplied of the product. b. maximizes the combined welfare of buyers and sellers. c. minimizes...

science
what do the tropic of capricon, tropic of cancer lines, artic, an antartic circles represent?

science
how were the latitudes of the tropic of cancer, tropic of capricorn, Arctic circle, and Antarctic circle determined?

science
heyy my friend rob needs help can u help him too?

math
Given: They collected 49 + 72 + 108 + 121 = 350 lbs of cans. So, the KNOWN part of the question is, “These folks collected 350 lbs of cans.” Answer: 10 I say the answer, 10, is really, “10 cents per pound.” Therefore, the UNKNOWN part of the question is, &#...

4th grade math
Sixty-five hundredTHs is 0.65 (0.065 would be sixty-five thousandths).

rehabilitation
under what circumstances is it easy to turn your will and life over to the care of god

Algebra
I have to solve the following equation: x+y=9 xy=54 I changed the first equation to y=9-x to solve for y. I got x(9-x)=54 and then 9x-x^2=54. I then changed 9x-x^2= 54 to -x^2 +9x-54=0. I got stuck around here, can someone explain...

math
hi i was wondering how would you find the equation of a parabola with it's vertex at -2,0, and with no directrix or focus given. the parobala opens toward the left. the two choices in my multiple choice answer sheet that sound the most logical would be x+2=-1/8y^2 and x-2=...

Trigonometry
cos2x(2cosx+1)=0 x=?

calculus I
thanks!!

calculus I
Find the tangent line approximation to 1/x when x=1 How do i find tangent line approximations??? my prof hasn't gone over this and i don't understand how to do it.

Caculus I
If f is decreasing and f(20)=10, which of the following must be incorrect? Explain. a. (f^-1)'(20)=-3 b. (f^-1)'(10)=12 how do i work this problem? i'm kind of confused about inverse functions.

6th grade advanced math
14

history
what items would you carry on a trip in the 15th century?

chemistry
dfgdfgdfsgd

calculus
Given f(x)=2x^3-7 find f^-1(x) and then find f^-1(-2) I though that this meant inverse function. x=2y^3-7 x+7=2y^3 (x+7)/2=y^3 ((x+7)/2)^(1/3)=y so this meant f^-1(-2) = 1.35721 The professor posted the answer as being 6. I'm not sure if I misunderstood the question or if ...

Math
For a period of time as an alligator grows, its mass is proportional to the cube of its length. When the alligator's length changes by 15.8%, its mass increases by 17.3kg. Find its mass at the end of this process.

Science
An object accelerates (changes its speed) only if the forces acting on it in one direction are greater than the forces in the opposite direction, All of the following objects will accelerate EXCEPT? A) a ball striking a wall, in which the force of the ball on the wall is equal...

Science
Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will cond...

HELP! ASAP! SPANISH!
i am writing a poem for spanish and in the poem we have to say a phrase about an animal. i have a crocodile. what is a good phrase that i can say in spanish about a croc? thanks sooo much!

history
in 1920 the republicans did something they hadn't done in a very long time. What was it?

Physics
List at least two major potential asvantages of power production by fusion rather than by fission.

Physics
Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.

Physics
If a pair of carbon atoms were fused, and the product were to emit a beta particle, what element would be produced?

Physics
Mixing copper and zinc atoms produces the alloy brass. What would be produced with the fusion of copper and zinc nuclei?

Physics
Which process would release energy from gold, fission or fusion? Which would release energy from carbon? From iron?

RECETAS
jugo de naranja? vas al supermarche

chemistry
How many grams of NaOH are present in 5.0 mL of a 1.0% (m/v) NaOH solution?

chemistry
thank you! Irvine is bomb Chem 1C is a bummer lol

Physics
Who was the scientist that invented the uncertainty principle ? Was it Heisenberg?

Physics
An electron and a proton are traveling at the same speed. Which one has the longer wavelength?

Physics
In the photoelectric effect, what determines the number of ejected electrons?

Physics
In the photoelectric effect, what determines the kinetic energy of the ejected electrons?

Physics
Which laser beam carries more energy per photon? red, yellow, green, violet? I think red. Am I right?

languages
are there any free downloadable courses that I could teach myself Arabic with? I can't seem to find any good ones.

math-patterns
Each number adds a digit: Example 6,38,932,1087,12437,123456,1234567,12345678,123456789, ect... The pattern is not the number itself, but how many numbers in each... Good Luck!

Chem
1)Br- + MnO2 + 3H2O Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + 48H2O Mn2+ + 32H3O+ + 6BrO3- 4)4Br- + 3MnO2 + 18H2O 3Mn2+ + 12H3O+ + 4BrO3- 5)Br- + 3MnO2 + 3H3O+ 3Mn2+ + BrO3- + 3H2O I got the first one. Is that right?

Chem
Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. 1)Br- + MnO2 + 3H2O --> Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ ---> 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + 4...

Chem
Calculate the Go for the oxidation of 5 moles of tin in the following balanced reaction. 16HCl + 2KMnO4 + 5Sn ---> 5SnCl2 + 2MnCl2 + 2KCl + 8H2O

Is this how you derive the formula for arc length?
For a smal change in x, dx: ds² = dx² + dy² ds = sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy² * dx²/dx²)] s = INTEGRAL of sqrt[(1 + dy² * 1/dx²)] dx s = INTEGRAL of sqrt[...

accounting
what is the most important step in the acounting cycle

Calc-Derivatives
I asked this before and did not get a response so I am trying again. (Note, I didn't know how to type the symbol for pi) What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in front of the r^4 and...

calc
What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in front of the r^4 and so you would just use the power rule.

Calc
Can this be factored: 6/5x^1/5 - 12/5x^-4/5 I am trying to find the values for X which will make this equal to zero. My factoring looks like this but not sure it is right 6/5x^1/5(1-2x^-1) so I get X= 0 and X=2

social studies
who does John Hancock resemble, and how?

Physics
Can two equipotentials ever cross one another? Explain via analogy to a topographical map Can two equipotentials be tangent to one another? What is the analogous situation in the case of a topographical map? What is your thinking on this? I will be happy to critique your think...

Physics
For a resonance tube apparatus (open ended on one side) with a total tube length of 1.00 meter, on a day when the speed of sound is 340 m/s, how many resonance positions will be observed as the piston position is varied for a frequency of 500 Hz? and 1000 Hz? Use the n as the ...

Physics
Why should a tuning fork be set into oscillation by striking it with a soft rubber mallet rather than with a hard metal mallet? Striking it with a hard mallet excites higher order modes rather than mainly the fundamental. That is because a hard mallet impact causes steep stres...

Physics
Does centripetal force acting on an object in uniform circular motion do work on the object? For work, force must be in the direction of movement. Please stop posting under differing names.

chem expirement!
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of reactio...

chem experiment:
You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose enthalpy of reactio...

Calc Help
I need to find dq2/dpb and dqb/dpa qa=2500+(600/pb+2)-40pa qb=3000-100pb+(400/pa+5) a and b are subscripts.

Calc Help
Marginal Cost = 30sqroot(x+4) with fixed costs of $1000. Marginal Revenue = 900. find profit or loss from production and sale of 5 units. how many units will result in a max profit? what is the max profit? Can someone please help. Trying to review for my final and really stuck...

Calc Help
demand = (p+1)sqroot(q+1)=1000. Find elasticity of demand at a price of $39 per unit. I am really struggling with this problem is there anyone that can help me? i am not familiar with the terminology, but if you are trying to solve for p, it is not that hard (p+1)√(p+1) ...

algebra
A bicyclist rode into the country for 5hr. In returning her speed was 5 mi/h faster and the trip took 4 hr. what was her speed each way? What equation would I use to solve this problem i have no idea Let V be her speed going out, so V+5 will be her speed coming back. Let the d...

calculus
i'm having trouble with a problem in my calc class...it isn't really calculus yet since we're still in the review section but it goes somethign like this: ( don't have it in front of me) a rational function is defined by: R/(x-K) where R and K are constants. fi...

Calc Help
Find two functions that this could be the derivative of: y'=4x+7 Remember the derivative of any constant is zero. take its antiderivative i suppose... y= 2x^2 + 7x + any number

Calc Help
An agency charges $15 per person for a trip for groups of no less than 30 people. But for each person above the 30, the charge (for everyone!) will be reduced by $0.15. Write a revenue function for the agency usin x as number of people above 30. What size group will maximize t...

Calc Help
The daily sales, S, in thousands of dollars, is a function of the money, x, spent on advertising (in thousands of dollars) according to: S(x)= -x^3+9x^2+6/6. Find the x-coordinate of the point of diminishing returns. How much money is spent on advertising when you reach the po...

Calc Help
f(x)=x^4-16x^2. Is this function concave up or down at x=-2? I will be happy to critique your thinking.

Calc Help
Find the 4th derivative of y=4x^3-(2/x). Reads: 4x to the third minus 2 divided by x. I will be happy to critique your thinking. We dont do homework or tests.

Calc Help
Differentitate y= x^2(sqroot4x-3). Do not simplify. Reads: x squared times the square root of (4x minus 3)

Organic Chemistry
What is the product formed from a reaction of butanal and sodium hydroxide? cyclopentanone and sodium hydroxide? acetophenone and sodium hydroxide? Thanks. You want to look up information about the Aldol condensation.

organic chemistry
which alcohol and carboxylic acid would produce benzyl isobutyrate by Fischer esterification? and which alcohol and carboxylic acid would produce isobutyl benzoate by fischer esterification? I can't find anything about Fischer esterification specifically. But acids + alcoh...

fischer esterification
which alcohol and carboxylic acid would produce benzyl isobutyrate by Fischer esterification? and which alcohol and carboxylic acid would produce isobutyl benzoate by fischer esterification? Since this is not my area of expertise, I searched Google under the key words "Fi...

Chemistry Help!!!
How will the osmotic preassure of an aqueous solution change as evaporation occurs? A.The osmotic preassure will increase. B.The osmotic preassure will not change. C.The osmotic preassure will decrease. D.The osmotic preassure will increase or decrease until it equals the vapo...

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