Wednesday
December 7, 2016

# Posts by w

Total # Posts: 86

physics
Sam and Sue are running side by side in a marathon. They are running at a constant velocity of 10 km h . What is Sue's relative velocity to Sam? A) 0 km/h B) 5 km/h C) 10 km/h D) 20 km/h
October 26, 2016

Statistics
In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164 cm. What was the mean height for both groups put together? The answer I got by adding the two means and dividing them by 2 is 171 but it is wrong, it must be 169.9, how can I ...
September 20, 2016

Child Developmental
The second question b or c
October 2, 2015

ADHD
Okay can you please help me?
October 2, 2015

ADHD
Which of the following is true of the cause and treatment of ADHD ? A. Drug therapy alone is not very effective in treating hyperactivity b. academic and social skills are best treated with a combination of medication and other treatment. C. Usually caused by a child diet d. ...
October 2, 2015

Child development
Thanks so for the help.
October 2, 2015

Child development
Refers to breaking down complex skills into their component parts? A. Differentiation b. integration c. Motor skills d. Locomotion I am think b but am not sure if it right.
October 2, 2015

Physics
Sam, whose mass is 71.0 kg , takes off down a 51.0 m high, 11.0 ∘ slope on his jet-powered skis. The skis have a thrust of 210 N . Sam's speed at the bottom is 41.0 m/s .
October 1, 2015

Statistics
I have been working on the following homework problem: Consider Homer and Bart's consumption of potato chips and donuts. Suppose that Marge is in the room 30% of the time that Bart is eating chips and 40% of the time that Bart is eating donuts. Similarly, suppose that ...
April 23, 2015

M
Small muscle usually occurs before large muscle development think false
November 20, 2014

School
Small muscle usually occurs before large muscle. I am think false.
November 20, 2014

School
Daily activity can boost academic performance true or false I am think t
November 20, 2014

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
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

Science
Cotton
March 12, 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

statistics
0.0067
April 6, 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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