Thursday

October 23, 2014

October 23, 2014

Total # Posts: 69

**calculus**

The half-life of Radium-223 is 11.43 days. If a sample has a mass of 400 mg, find the mass (in mg) that remains after 6 days
*October 14, 2014*

**phisecs**

water is moving with a speed of 5 m/s through a pip with a cross-sectional area of 4cm^2 . the water gradual descends 10 m as the pipe cross-sectional area increases 8cm^2 . if the pressure at the upper level is 1.5*10^5 , the pressure at the lower level is ?
*April 22, 2014*

**phisecs**

In a collision, an automobile of mass 826 kg stops with constant acceleration in 20 m from an initial speed of 17 m/s. What is the acceleration of the car in m/s
*March 24, 2014*

**phisecs**

.: A 5.0 kg block is moving with constant velocity down a rough incline plane. The coefficients of static and kinetic friction between the block and the incline are 0.25 and 0.20, respectively. What is the inclination angle of the incline plane?
*March 24, 2014*

**phisecs**

thank you for helping me , but i couldn't find similar question at the bottom or in the search button , could you please give me the link to it . thank you soo much
*February 21, 2014*

**phisecs**

`filling the blanks: sun_________________ than moon. earth is__________________mercury.''.
*February 21, 2014*

**phisecs**

In a period of 3 h, a man walks 13 km north, turns around and walks 5 km south. Find his average velocity in km/h? Please pay attention to sign. (-) means the average velocity is to the south, (+) means the average velocity is to the North.
*February 21, 2014*

**phisecs**

In a period of 3 h, a man walks 13 km north, turns around and walks 5 km south. Find his average velocity in km/h? Please pay attention to sign. (-) means the average velocity is to the south, (+) means the average velocity is to the North.
*February 20, 2014*

**phisecs**

279 thanks
*February 18, 2014*

**phisecs**

A car travels in a straight line at 67 km/h for 1 h and at 106 km/h for 2 h. How far does it travel?
*February 18, 2014*

**geometry**

a 16 by 18 foot rectangular section will be covered by square tiles that measured 2 feet on each side if the tiles are not cut how many of them will be needed to cover the section of the wall
*October 4, 2013*

**geometry**

the perimeter of a rectangle is 72. the base is 3 times the height find the area of the rectangle
*October 3, 2013*

**w**

does that mean 22 people of every 100 that aplky get accepted
*October 2, 2013*

**englsih**

what is writing conventions and how do i improve min
*September 29, 2013*

**algebra**

The length of a spring is a linear function of the mass of the object hanging from it. For a particular spring, the length was 12 centimeters when a 2-kg mass was attached to it. When a 5-kg mass was hung from it, it stretched to a length of 18 cm. Which equation relates the ...
*June 16, 2013*

**Physics**

5A doesn't seem to work
*June 15, 2013*

**Physics**

22.8
*May 30, 2013*

**Physics**

anyone get #6
*May 22, 2013*

**Physics**

anyone????
*May 22, 2013*

**Physics**

anyone get #6???
*May 22, 2013*

**Physics**

c = 0.00448571428571 d = 0.00897142857143 do you know lightly damped circuit or RC circuit
*May 6, 2013*

**Physics**

heeeelp
*May 5, 2013*

**Physics**

anyone get this
*May 5, 2013*

**Physics**

formulas for b and c anyone?
*May 1, 2013*

**Math**

Let p>q>0 with p+q = 1 and a = q/p < 1. Let X_n denote the random walk with transitions X_{n+1} = CASE 1: X_n + 1 with probability p and CASE 2: X_n - 1 with probability q. For i â‰¥ 0, we set u_i = P(X_n = 0 for some n â‰¥ 0|X_0 = i). ...
*September 7, 2012*

**4th grade limericks**

So fat and could glow
*April 30, 2012*

**Calculus**

Find a power series, centered @ x=0, for function f(x)=x/(1+2x). I know this is a maclaurin series, but my work doesn't get the right answer. Can you please show steps? Also,do all power series start with a 1, as in (1+2x+4x^2+...)? Thanks in advance!
*March 8, 2012*

**Calculus**

Find a power series, centered @ x=0, for function f(x)=x/(1+2x). I know this is a maclaurin series, but my work doesn't get the right answer. Can you please show steps? Also,do all power series start with a 1, as in (1+2x+4x^2+...)? Thanks in advance!
*March 8, 2012*

**Math/Finance**

General Hospital has a current ratio of 0.5. Which of the following actions would improve (increase) this ratio? (Hint: Create a simple balance sheet that has a current ratio of 0.5. Then, judge how the transactions below would affect the balance sheet.) 1. Use cash to pay off...
*February 21, 2012*

**Calculus**

Write the first four nonzero terms and the general term of the Taylor serires for f about x=0. f(x)=2x/(1+x^2) I feel that I'm doing this wrong because finding the derivatives of f(x) look really messy. Can you please show me the steps? Thanks in advance!
*February 9, 2012*

**Calculus**

Thank you! That was helpful :)
*February 7, 2012*

**Calculus**

A block of ice is exposed to heat in such a way that the block maintains a similar shape as it metls. The block of ice is initially 2' wide, 2 'high, and 3' long. If the change in the width of the ice is -1/3 ft/hr, find: the amount of time it will tak efor the ...
*February 7, 2012*

**Calculus**

How do I find the limit of (1+sin(pi times x))^(1/x) as x approaches 0? I tried using wolframalpha, but am unable to understand their steps. My thinking is that you set y=the limit and use L'hopital's rule a couple times. The answer I got was y=e^0--->y=1, but the ...
*January 19, 2012*

**Calculus**

awesome! Thanks Damon ;D
*January 2, 2012*

**Calculus**

very cool. Thanks, both of you! Does wolfram alpha give steps for all integration problems?
*January 2, 2012*

**Calculus**

Integrate (1/2)sin(x^(1/2))dx. I've tried using u-substitution, with u=sin(x^(1/2)). du would then = ((1/2)x^(-1/2))(cos(x^(1/2))). As you can see, this only make the problem more complicated. I don't get what to do. Thank you in advance!
*January 2, 2012*

**Calculus**

Integrate dx/xlnx. What method am I supposed to use? I'm totally lost.
*January 2, 2012*

**calculus**

How do I integrate x(arctanx) dx? Is it some sort of integration by parts? Can you please show steps? Thanks in advance!
*December 15, 2011*

**Calculus**

thanks! that was really helpful ;)
*December 14, 2011*

**Calculus**

If 3x^2-2y^2=4xy + 20, find the point(s) at which the graph from Problem 28 has vertical tangents. I found that dy/dx= (3x-2y)/(2x+2y), but now I don't know what to do. Do I set dy/dx to 0?
*December 14, 2011*

**Calculus**

Thank you! Now I understand that I should've multiplied by y instead of moving the whole "2/y (dy/dx)" to the other side of the equation and then factor the dy/dx out. I can't believe how such a simple manuever can make the problem so much easier to solve. ...
*November 30, 2011*

**Calculus**

I am having trouble differentiating x^2 + 2lny = y (solving for dy/dx). I know that I need to do implicit differentiation, but the answer I get is not correct. The answer I got was (2x-2xy)/2, but the answer is (2xy)/(y-2). How do I do this problem?
*November 30, 2011*

**Calculus**

How do I integrate (e^(3/x))/(x^2) from 1 to 3. I understand how and why I need to do u-substitution, with u=3/x and so dx=(-3 du)/x^2. After plugging (-3 du)/x^2 in for dx, I get a really messy problem that I don't know how to finish. Can you please explain the step? ...
*November 21, 2011*

**physics**

19. In Figure 10-1, if the force exerted on a 3.0-kg backpack that is initally at rest is 20.0 N and the distance it acts over is 0.25 m, what is the final speed of the backpack?
*November 15, 2011*

**math**

How do I find the length of curve f(x)=3x^2-2x+3 on the interval [1,4]? I have no idea on how to start this. Anyways, thanks in advance!
*November 15, 2011*

**Calculus**

How do I determine the area of a region bounded by a function and the x-axis if given y=cosx and interval is [0,ð/2]. This has to do with the Fundamental Theorem of Calculus. Thanks in advance!
*October 27, 2011*

**Calculus**

The point (1,-2) is on the graph of y^2-x^2+2x=5. Find the value of (dy/dx) and (d^2y/dx^2) at the point (1,-2). How do I find (d^2y/dx^2)? I found. I found (dy/dx) to be 2y(dy/dx)-2x+2=0, but I don't know how to take the derivative of that to get(d^2y/dx^2)? I'm not ...
*October 18, 2011*

**insurance prep**

Where i can find information about blocks 18 and 19
*June 2, 2011*

**Chemistry**

change grams to moles using the periodic table then use this equation molarity= moles of solute/liters of solution
*April 22, 2011*

**Math**

when x=10, y=17 when x=50, y=97 when x=100, y=197
*April 22, 2011*

**Math**

X|Y --- 0|(-3) 1|-1 2|(1) 3|3 4|(5) 5|7 y=2x-3
*April 22, 2011*

**algebra**

Rewrite the equation to standard form. 6x-5y=15 (6/5)x-y=3 y=(6/5)x-3 The coordinates for y intercept is always in the (0,_) format. Y-intercept is what is added or subtracted. The coefficient on x (number multiplied to x) is slope. slope=6/5 y-intercept=(0,-3)
*April 22, 2011*

**Euro history**

What is the immediate cause of WWII? Is it Germany's invasion of Poland? I can't remember.
*April 22, 2011*

**Biology**

They are all right. I take AP BIO.
*April 22, 2011*

**math**

two baseball players bat first and second in the lineup the first batter has on base percentage of 0.46 the second batter has an on base percentage of 0.31 if someone is on base but only 0.23 if the bases are empty at the start of the game what is the probability that both ...
*January 5, 2011*

**Chemistry**

2 B5H9(l)+12 O2(g)---->5 B2O3(s)+9 H2O(l) Calculate the kilojoules of heat released per gram (kJ/g) of the compound reacted with oxygen. The standard enthalpy of formations of B5H9(l), B2O3(s), and H2O(l) are 42.84, -1271.94, and -285.83 kJ/mol, respectively.
*November 1, 2010*

**Math**

I need some help with this question. (5/x-2) = (6/x+6) + {29/(x-2)(x+6)} I don't know how to solve this. Can someone help me figure this out? Thanks.
*September 2, 2010*

**accounting**

The following information is for X Company for 2009: Direct materials purchased $ 36,484 Direct materials used 34,013 Direct labor 14,439 Overhead 25,464 Work in Process, January 1, 2009 4,118 Finished Goods, January 1, 2009 2,326 Work in Process, December 31, 2009 2,980 ...
*February 19, 2010*

**chemistry**

A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. What is the molecular formula?
*January 20, 2010*

**chemistry**

A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. What is the molecular formula?
*January 20, 2010*

**chemistry**

How many moles are there in 4.76e24 atoms Al?
*January 20, 2010*

**chemistry**

The pain reliever morphine contains 17.900 g C, 1.680 g H, 4.225 g O, and 1.228 g N. What is the emperical formula of morphine?
*January 20, 2010*

**chemistry**

The chemical analysis of aspirin indicates that the molecule is 60.00% carbon, 4.44% hydrogen, and 35.56% oxygen. What is the emperical formula for asprin?
*January 20, 2010*

**chemistry**

How many moles are there in 23.6g Ag?
*January 20, 2010*

**chemistry**

A sample of carbon dioxide has a mass of 47.4 g. How many carbon atoms are present?
*January 20, 2010*

**chemistry**

A sample of silver chromate (Ag2CrO4) has a mass of 29.0 g. How many CrO42- ions are present?
*January 20, 2010*

**physics**

Well this must be a pretty common question because I had it too. The problem here is the Voy is Vo(SIN(23) not cos)/10.0 (or 9.8). Also because the Vfy is 0 in the middle of the jump used only use half the X for the horizontal component. This is how I got the 11 m/s initial ...
*July 31, 2008*

**French Pen-Pal**

dont do it
*April 20, 2008*

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