Tuesday

March 31, 2015

March 31, 2015

Total # Posts: 1,149

**Trigonometry**

Given \tan \theta = -\frac{4}{3}, where \frac{\pi}{2} < \theta < \pi, what is the value of \frac{1}{\sin \theta + \cos \theta}?
*March 27, 2013*

**Geometry**

The vertices of a regular 10-gon are labeled V_1, V_2, \ldots V_n, which is a permutation of \{ 1, 2, \ldots, 10\}. Define a neighboring sum to be the sum of 3 consecutive vertices V_i, V_{i+1} and V_{i+2} [where V_{11}=V_1, V_{12}=V_2]. For each permutation \sigma, let N_\...
*March 27, 2013*

**Geometry**

ABCD is a trapezoid with AB < CD and AB parallel to CD. \Gamma is a circle inscribed in ABCD, such that \Gamma is tangent to all four sides. If AD = BC = 25 and the area of ABCD is 600, what is the radius of \Gamma?
*March 27, 2013*

**Geometry**

Two points are chosen uniformly at random on the unit circle and joined to make a chord C_1. This process is repeated 3 more times to get chords C_2, C_3, C_4. The probability that no pair of chords intersect can be expressed as \frac{a}{b} where a and b are coprime positive ...
*March 26, 2013*

**Geometry**

Two points are chosen uniformly at random on the unit circle and joined to make a chord C_1. This process is repeated 3 more times to get chords C_2, C_3, C_4. The probability that no pair of chords intersect can be expressed as \frac{a}{b} where a and b are coprime positive ...
*March 26, 2013*

**Geometry**

When writing a math expression, any time there is an open bracket "(", it is eventually followed by a closed bracket ")". When we have a complicated expression, there may be several brackets nested amongst each other, such as in the expression (x+1)*((x-2...
*March 26, 2013*

**Science**

Please help me with matching the stages of the meiosis to its proper description. Sentences: 1. Members of each homologous pair separate from each other (chromatids) still remain together). 2. Homologous chromosomes pair up with each other and chromosomes 'cross over' ...
*March 25, 2013*

**geochemistry**

@DrBob222: I know how to do redox problems. It's just that this problem has a specific answer with the coefficients being 5,4=>2,4,1,3. Where no protons remain in the final answer
*March 14, 2013*

**geochemistry**

Been trying to balance this equation for a while, but can't get the right answer. any help would be apperciated! CH2O (aq) + NO3 - ---> N2 + HCO3 - + CO2(g)
*March 14, 2013*

**Math problem solving**

in 5 years time i will be 3 times as old as my son. in 14 years time, the sum of our ages will be 62. find the sum of our ages today
*March 7, 2013*

**compound interest**

1. If you were to place $15,000 in the bank at 3% interest, how much would you have in the bank after one year if the interest were compounded quarterly?
*March 7, 2013*

**Fiance**

Use your knowledge of income statements to fill in the missing items: Sales Cost of goods sold $575,000 Gross profit $1,600,000 General and administrative expense $200,000 Selling and marketing expense $ Depreciation $50,000 Operating income $ Interest $100,000 Income before ...
*March 3, 2013*

**Finance**

Use the “balance sheet equation” to determine owners’ equity if liabilities are $5 million and assets are $10 million. Assets = Liabilities + Owners’ equity
*March 2, 2013*

**math**

the factor of part b. would end up being 3x^2(23-3pi). because you would have to bring down the area of part a. which would be 69x^2 with the 9pix^2 not 84, therefore, giving the factored solution of 3x^2(23-3pi). 3 is the gcf because 69 cannot and 9 cannot be multiplyed to ...
*March 1, 2013*

**Statistics**

Really, you will go to this length to cheat? This is a part of an online exam, please do not answer
*March 1, 2013*

**StatIstics**

The answer is....Do your homework and stop cheating, this is a part of an online exam, please do not answer
*March 1, 2013*

**Physics**

A block weighing 5.7 N requires a force of 2 N to push it along at constant velocity. What is the coefficient of friction for the surface?
*February 19, 2013*

**Entropy question**

What is the absolute entropy of 2.5 mol of gaseous methane at 1.3 bar and 298 K?
*February 10, 2013*

**Science**

If the adverage weight of a human body is 75kg and given the mass of the earth is 5976 x 10^21kg, how many people will it take to exceed the weight of the earth? At the present growth of 1.14%, when will the present population of 6.8 x 10^9 grow to that number?
*February 6, 2013*

**physical science**

In terms of energy, the general chemical equation AB+CD+energy = AD+CB represents a (an)_________ reaction.
*January 29, 2013*

**English**

What elements of the Restoration comedy are seen in The Importance of Being Earnest?
*January 22, 2013*

**Penn Foster**

im sorry ive been trying to find the answer for this but its deff. not A i just got it wrong.
*January 22, 2013*

**U Hart**

The 50 kg cylinder shown, which was initially at rest, rolls without slipping. when the speed of A is 20 cm\s, the speed of point B is most nearly
*January 14, 2013*

**chemistry**

Use the reaction shown to calculate the mass of iron that must be used to obtain 0.500 L of hydrogen at STP: 3Fe(s) + 4H2O(l) pr029-1.jpg Fe3O4(s) + 4H2(g
*January 13, 2013*

**Principles of Finance**

Determine the size of the M1 money supply using the following information. Currency $700 billion Money market mutual funds $2,000 billion Demand deposits $300 billion Other checkable deposits $300 billion Traveler’s checks $10 billion
*January 13, 2013*

**physics**

A van traveling down a slope with a uniform acceleration of 2.15 meters/second2 attains a speed of 20.00 meters/second after 7.00 seconds. What is the initial velocity of the van?
*December 18, 2012*

**Trig**

15^(-x-3)=-17^(-3x) using a log base 10
*December 12, 2012*

**John**

Is the following simple, compound, comples, or compound complex sentences? The shopping mall has a store that sells nothing but clocks. The governor chose the best people whom we could find for the committee; Mr. Dobbs was appointed committee chairman.
*December 11, 2012*

**physics**

An attack helicopter is equipped with a 20- mm cannon that fires 105 g shells in the forward direction with a muzzle speed of 669 m/s. The fully loaded helicopter has a mass of 4260 kg. A burst of 133 shells is fired in a 5.41s interval. What is the resulting average force on ...
*December 10, 2012*

**Physics**

A(n) 20.5 g bullet is shot into a(n) 6254 g wooden block standing on a frictionless surface.The block, with the bullet in it, acquires a speed of 1.64 m/s. Calculate the speed of the bullet before striking the block. Thank you
*December 10, 2012*

**Physics**

A(n) 20.5 g bullet is shot into a(n) 6254 g wooden block standing on a frictionless surface.The block, with the bullet in it, acquires a speed of 1.64 m/s. Calculate the speed of the bullet before striking the block. Thank you
*December 10, 2012*

**Physics**

A(n) 20.5 g bullet is shot into a(n) 6254 g wooden block standing on a frictionless surface.The block, with the bullet in it, acquires a speed of 1.64 m/s. Calculate the speed of the bullet before striking the block. Thank you
*December 10, 2012*

**Physics**

Before the force is applied (t < 0 on the graph), the particle moves along the X axis with velocity V1 = -6.6 m/s. Find the velocity V2 of the particle after force stops acting on it. (t > 9s)
*December 10, 2012*

**Chemistry**

How many moles of Br2 are present in 500mL of vapor when Br2(l) and Br2(g) are in equilibrium at 33 degrees celcius? (Pvap Br2 at 33C = 299 mm Hg)
*December 7, 2012*

**Organic Chemistry**

The 3:1 doublet at m/z=64 and 66 is the characteristic "isotope cluster" for one chlorine atom. The compound contains chlorine. The molecular ion (and molecular weight) is 64. (M/z=66 is the 37Cl isotope peak at M+2.) Subtracting the mass of 35Cl from the mass of ...
*December 5, 2012*

**calculus**

find the limit u-> sqr(u^4 + 3u+ 6)
*December 3, 2012*

**Chem**

A And B are my main problems
*December 3, 2012*

**Chem**

Methane and Hydrogen Sulfide react at 960 degree Celsius and come to the following equilibrium CH4(g)+2H2S(g) <-> CS2(g)+ 4H2(g) At Equilibrium the concentration measured as [Ch4]= 5.56M [H2s]= 11.12 [CS2]= 2.44M [H2] 1.76, A) Write the equilibrium constant expression ...
*December 3, 2012*

**College Algebra**

log(xy^12)
*December 1, 2012*

**math**

Solve the equtions b = 1.2g and b= 2(g-50) to get 150 boys.
*November 30, 2012*

**Calculus**

It took me your trig substitution followed by a u substitution to get 93squrt(x^2+9)/9x+C
*November 30, 2012*

**QBASIC, Computers question 2 **

Why do I keep getting a Type Mismatch error on this line? Also, when i click "View" to view my output screen its blank, so nothing is printing.... can so please help me resolve this? PRINT USING D$; NAM$; VehicleType$; DaysHeld; Miles; Charge My Code: '...
*November 29, 2012*

**QBASIC, Computers**

Yes, It doesnt print anything to the output screen and I get a syntax error on the READ line.... READ EmployeeNam(N), Salary(N)
*November 29, 2012*

**QBASIC, Computers**

The following is a list of salaries of the six employees in a certain company: Name Salary T. Angel $43,000 F. Smith $31,000 K. Johnston $22,000 P. Miner $18,000 C. Altman $27,000 A. Lu $19,000 Read a single dimension array for name and another array for Salary. Calculate and ...
*November 29, 2012*

**stats**

what is the distinction between repeated measurements and matched items?
*November 27, 2012*

**physics**

What is the speed of sound in a medium where a 100-kHz frequency produces a 5.96-cm wavelength?
*November 27, 2012*

**physics**

What is the sound intensity level in decibels of ultrasound of intensity 10^5 W/m2, used to pulverize tissue during surgery
*November 27, 2012*

**physics**

What sound intensity level in dB is produced by earphones that create an intensity of 4.00¡¿10^-2 W/m^2?
*November 27, 2012*

**physics**

What is the intensity in watts per meter squared of 85.0 db sound?
*November 27, 2012*

**Social studies**

what was the formal name for our country?
*November 27, 2012*

**physics**

The pendulum on a cuckoo clock is 5.00 cm long. (a) Determine the period of this pendulum. (b) What is its frequency?
*November 20, 2012*

**physics**

What mass on a spring with a spring constant of 120 N/m will oscillate with a period of 1.0 s?
*November 20, 2012*

**physics**

A force of 85 N is required to compress the spring by 0.0200 m. How much force is needed to compress the spring by 0.0600 N? 3.
*November 20, 2012*

**physics**

A 4.5-kg block is hung from a spring causing the spring to elongate 12 cm. With what period will the spring oscillate if the spring was stretched 15 cm and released?
*November 20, 2012*

**Science**

What is the Frosted Eflin's role in the food chain?
*November 18, 2012*

**science**

A bullet with a mass of 7.11 g and a speed of 774 m/s penetrates a tree horizontally to a depth of 1.85 cm. Assume that a constant frictional force stops the bullet. Calculate the magnitude of this frictional force. Try energy considerations. Answer in units of N
*November 16, 2012*

**science**

An outfielder throws a 1.88 kg baseball at a speed of 57 m/s and an initial angle of 10.2. What is the kinetic energy of the ball at the highest point of its motion? Answer in units of J
*November 16, 2012*

**science**

It takes 3.38 J of work to stretch a Hooke’s-law spring 5.63 cm from its unstressed length. How much the extra work is required to stretch it an additional 4.22 cm? Answer in units of J
*November 16, 2012*

**physics**

The equation of motion for an oscillator is given by y= (0.200cm)sin (140t). What are the 1)amplitude 2)period, and 3)frequency of this motion?
*November 14, 2012*

**physics**

The equation of motion for an oscillator is given by y= (0.200cm)sin (140t). What are the 1)alplitude, 2)period, and 3) frequency of this motion?
*November 14, 2012*

**calculus**

An auditorium with a flat floor has a large screen on one wall. The lower edge of the screen is 3 feet above eye level and the upper edge is 10 feet above eye level. Assume you walk away fron the screen at a rate of 3 ft/s while looking at the screen. What is the rate of ...
*November 13, 2012*

**physics**

Radio waves transmitted through space at 3.00¡¿10 8 m/s by the Voyager spacecraft have a wavelength of 0.120 m. What is their frequency?
*November 13, 2012*

**physics**

What is the wavelength of an earthquake that shakes you with a frequency of 10.0 Hz and gets to another city 84.0 km away in 12.0 s?
*November 13, 2012*

**physics**

Wind gusts create ripples on the ocean that have a wavelength of 5.00 cm and propagate at 2.00 m/s. What is their frequency?
*November 13, 2012*

**Math**

The El Paso Middle School girls' basketball team is going from El Paso to San Antonio for the Texas state championship game. The trip will be 560 miles. Their bus travels at an average of 60 miles per hour. Estimate the distance the bus travels in 2 hours.
*October 28, 2012*

**math**

solve for x e^(2x+3) -7 = 0
*October 25, 2012*

**Chemistry**

A sample of CO2 gas in a syringe has a volume of 25.0 mL at 20.0 ºC. If you warm the gas in your hand to 37 ºC, what will be the final volume?
*October 25, 2012*

**physics**

2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
*October 23, 2012*

**Physics**

2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
*October 23, 2012*

**Physics**

The gravitational field strenght on the moon is 1.63N/kg. If a rock on the moon weights 2000N, how much does the same rock weigh on the earth?
*October 21, 2012*

**Math**

how do you break apart arrays?
*October 17, 2012*

**ant 101**

A “hope chest” is a form of: (Points : 1) *brideprice. bridewealth. dowry. brideservice.
*September 24, 2012*

**language arts**

The italicized words are "Listening to the mix CD my brother made for me".
*September 19, 2012*

**language arts**

I believe its D.
*September 19, 2012*

**math**

andre drove part of a 260km trip at 80kph and the rest at 100kph. find the distance he traveled at 80kph if his total driving time was 2h 30min
*September 17, 2012*

**math**

my number is 5 more than one-half my number. What is my number?
*September 17, 2012*

**plz help ms sue**

the answers are 1. A 2.B 3.D 4.B hope this helps.
*September 13, 2012*

**Math**

#2 is wrong its b
*September 13, 2012*

**physics**

Acceleration is the change in velocity over time: Acceleration = (Final velocity - initial velocity)/time Since there are no directions involved, speed is used instead of velocity. So you know the initial speed: Initial speed = 53800 m/s And you know the final speed: Final ...
*September 11, 2012*

**MATH**

Just start at 2 and divide 255 which is (2^8)-1. 255/2 =127.5 Not divisible by 2. 255/3 = 85 We have one prime number, 3. 255/5 = 51 We have two prime numbers - 3,5. 255/7 = 36.43 Not divisible by 7 255/9 = 28.33 Not divisible by 9 255/11 = 23.18 Not divisible by 11 . . . 255/...
*September 11, 2012*

**MATH**

You have to break 1260 down into it's number tree. Start by dividing the number by 2 until you can't do it evenly, then divide by 3, and so on until no more divisions can be made: 1260/2 = 630 So we have one prime factor, 2 and are left with 630: 630/2 = 315 Now we ...
*September 11, 2012*

**MATH URGENT**

In either case though, you have to think. How many even or odd numbers are there between 1-100? The answer is 50. So in order to guarantee the removal of an even number 51 integers must be randomly removed.
*September 11, 2012*

**MATH URGENT**

You may have to clarify, do you mean how many times will this have to be done to guarantee the removal of an even or odd integer? Because just removing one integer guarantees the removal of an integer.
*September 11, 2012*

**IPC**

Again, we start with the question: What would the final speed of a car be after 5.0 seconds with a starting speed of 50 mi/hr? What is needed to solve this equation: Acceleration of the car. Yes that is all that is necessary. To find the acceleration, this is where the 0-60 mi...
*September 11, 2012*

**physics**

To answer this question first it helps to know the first ants speed as cm/s: 16 meters/second * 1000cm/m = 1600 cm/s Which means that the first ant will reach the end of the counter in .034 seconds. The second ant is traveling at 3.99999 cm/s which means it will reach the ...
*September 11, 2012*

**Math**

There is quite the easy shortcut for adding any set of numbers from 1 to whatever and that is this: (n(n+1))/2 So, let's say you wanted to find the sum of all numbers from 1 to 99. 99 will be n and so the equation will look like the following: (99(99+1))/2 Solve for the ...
*September 11, 2012*

**IPC**

You should approach this problem by gathering all of the information that is relevant to answering the question. The question is: Will the student make it to class in 5 seconds? What is needed to answer this question? Velocity of the student, and distance to the class room. ...
*September 11, 2012*

**chemistry**

Molality id defined as (moles of a solute)/(kg of solvent). So the concentration of Ca in the river water would be (13.4 mg/kg) * (1/1000 g/mg) * (1/40.078 mol/g) = 3.34 x 10^-4 mol/kg The key to solving any concentration problem is knowing what units you're starting with ...
*September 11, 2012*

**college biology**

If someone has abnormally low cholesterol levels then perhaps it is being consumed by processes that need cholesterol faster than it is being synthesized or brought in through the diet. Perhaps excess bile production, inability to use dietary cholesterol, excess steroid ...
*September 11, 2012*

**Chemistry**

A solution is made by dissolving 1.0 mole of Na2SO4(ionic compound) into water to get 1.0L of solution. Give the conc of all the ions present in solution in M?
*September 5, 2012*

**Math**

1. x/4 + 11 = -25 2. x/4 - 5 = 13 3. x/4 = 13
*September 4, 2012*

**chems**

A cubic piece of metal measures 7.50cm on each edge. If the metal is nickel, whose density is 8.90 {\rm g/cm}^3, what is the mass of the cube?
*September 3, 2012*

**algebra**

Briana's second test score was 8 points higher than her first score. Her third score was 88. She had a B average (between 80 and 89 inclusive) for three tests. What can you conclude about her first test score?
*September 3, 2012*

**Chemistry**

How do I calculated the mass and moles of nitric acids when only given 2ml of concentrate nitric acid
*August 30, 2012*

**Math**

The half-life of radioactive strontium-90 is approximately 28 years. In 1962, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 6 percent of the original...
*August 28, 2012*

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.7 m/s. The car is a distance d away. The bear is 27 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*August 23, 2012*

**physics**

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 6.8 m/s when going down a slope for 2.5 s?
*August 23, 2012*

**Physics**

A block of mass m 1 sits at rest on a table over a hole in the table. From below the table, a bullet of mass m 2 is fired vertically upwards into the block. The bullet imbeds itself in the block. The block and bullet rise to a maximum height h. What is the bullet’s ...
*August 6, 2012*

**Differential Equations**

Solve the differential equation below with initial conditions. Compute the first 6 coefficient. Find the general pattern. (1-x)y"-y'+xy=0 y(0)=1, y'(0)=1
*July 9, 2012*

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