Wednesday

October 22, 2014

October 22, 2014

Total # Posts: 59

**physics**

A 25.0-g mass is tied at the end of a 1.50-m long string and is whirled in a horizontal circle. If the string makes an angle of 30.0o with the vertical, what is the frequency of revolution of the mass?
*September 20, 2014*

**Biology**

How would u expect the number of mitochondria in a cell to be related to the amount of active transport it carries out? Please help!
*November 8, 2013*

**phy 111**

two forces act on a point object as follows:100N at 170 and 100n at 50
*October 14, 2013*

**phy 111**

two forces act on a point object as follows:100N at 170 and 100n at 50
*October 14, 2013*

**Geography**

Thank u very much
*September 16, 2013*

**Geography**

How do the people use the land in New Orleans Louisiana??? ( farming herding mining industry)?
*September 16, 2013*

**math**

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...
*April 3, 2013*

**math**

a store owner buys supplies from a vendor for $8,450. The terms of the sale are 2/10, n/30. What will be the net amount due if the owner pays by the 10th day after he receives the supplies
*November 8, 2012*

**Physics**

A speeder passes a parked police car at a constant speed of 23.9 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.21 m/s 2 . How much time passes before the speeder is overtaken by the police car? Answer in units of s How far does the ...
*September 4, 2012*

**social studies**

What are the causes and effects of the Glorious Revolution?
*May 14, 2012*

**Chemistry**

determine the specific heat capacity of a sample of zinc that weighs 187.2 grams if its temperature is changed from 22.0C to 35.0C when it absorbs 949 J of heat.
*May 9, 2012*

**Chemistry**

How many grams of Calcium Nitride can be produced using the calcium contained in 100 ml of a 4 Molar beryllium solution?
*April 15, 2012*

**math**

Rental cost for offices spaces have been going up at 6.2% per year compounded annually for the past 5 years. If office space rent is now $32 per square foot per month, what were the rental rates 5 years ago
*February 26, 2012*

**spanish**

deportes en mi escuela
*February 17, 2012*

**Physics**

ax i got 104.8 but its wrong and i rounded it to 105
*January 21, 2012*

**Physics**

At an air show, a jet plane has velocity components vx = 695 km/h and vy = 440 km/h at time 4.85s and vx= 933km/h and vy = 465 km/h at time 7.12 s. For this time interval, find (a) the x and y components of the plane’s average acceleration and (b) the magnitude and ...
*January 21, 2012*

**Math**

How do I create a quadratic equation that passes through the points (-1,2),(1,7),(4,5)?
*November 21, 2011*

**math**

Hints to solve following nonlinear equation please? y=-4.9x^2+20x+10 9.8x+y=20
*November 21, 2011*

**Math**

12 is the answer
*October 26, 2011*

**com/156**

how effectively does the essay persuaded you. Universal Health Care Coverage for the U.S. The United States is the only modernized Western nation that does not offer publically funded health care to all its citizens; the costs of health care for the uninsured in the United ...
*July 28, 2011*

**com/156**

how effectively does the essay persuaded you. Universal Health Care Coverage for the U.S. The United States is the only modernized Western nation that does not offer publically funded health care to all its citizens; the costs of health care for the uninsured in the United ...
*April 24, 2011*

**Finance**

The venture capital fund Techno Fund II made a $4 million investment in Optical Fibers Corporation five years ago and in return received 1 million shares representing 20 percent of Optical Fibers’ equity. Optical Fibers is now planning an initial public offering in which ...
*March 14, 2011*

**social studies**

Why is there civil unrest in Egypt?
*February 3, 2011*

**social studies**

how might a change in climate bring about a change in the personality of a region?
*October 24, 2010*

**Calculus**

um...I think I solved the problem. i forgot to substitute a=2 for the first part of the function. that way when you simplify it then you get -1/4. oh dear.
*February 23, 2010*

**Calculus**

oh wow. forgot the problem. the function is f(x) = 1/x, a=2 sorry haha
*February 23, 2010*

**Calculus**

Find the derivative of the given function at the indicated point. (use f'(a)=lim [f(a+h)-f(a)]/h as h approaches 0) This is what I have so far: [1/(x+h) - 1/2]/h = [2 - (x+h)]/(h(x+h)(2)) = [2-x-h]/(h(x+h)(2)) ...and now I'm stuck. Help? Thx
*February 23, 2010*

**Calculus (repost)**

Find the limit: lim {[1/(2+x)]-(1/2)}/x as x->0 How do you remove the complex fraction??? (or just complex fractions in general, I have trouble with them...) Thank you!
*February 15, 2010*

**Calculus**

Find the limits: lim {[1/(2+x)]-(1/2)}/x as x->0 lim (e^-x)cos x as x->infinity ...First off, I'm having trouble getting rid of complex fractions. I tried multiplying the whole numerator by [(2+x)/2], but you'd still get 0/undefined answer (the answer in the back...
*February 14, 2010*

**Math**

Graph the solution: 3x-y-7<0 x+5y+3>=0 This is my thought process in this: The first equation I can solve for y since we don't have to worry what x is. And I get y>3x-7. The second one, however, y is being multiplied by 5, so I can't just divide by 5 on both ...
*February 6, 2010*

**Math**

One solution of 12x^3-23x^2-3x+2=0 is 2. Find all other solutions. I tried rearranging the equation to factor by grouping, but that 23x^2 is bothersome and I can't get the right answers (I know the answers are 2, 1/4, and -1/3). Help? Thank you!
*February 3, 2010*

**Math**

Solve for the indicated variable: A = 2(pi)r^2 + 2(pi)rh, for positive r (and by pi i mean 3.14...) This is what I have so far: A = 2pi(r^2+rh) A/2pi=r^2 + rh ? Thanks!
*January 30, 2010*

**Math**

Solve for the indicated variable: (x/a)+(y/b)+(z/c) = 1, for c This is what I have so far: z/c = 1-(x/a)-(y/b) z/c = 1-[(xb-ay)/ab] z/c=(ab/ab)-[(xb-ay)/ab] z/c=(ab-xb-ay)/ab ...I'm not sure if it's right so far, and if it is, i don't know where to go after that. ...
*January 30, 2010*

**Math**

Solve for x: 2sin^2x = 3sinx + 2 on -pi < x < 4pi (the "<" signs are less than or equal to) i got the following answers: -pi/6, 7pi/6, 11pi/6, -5pi/6, and 23pi/6 are there any more answers? thank you!
*December 5, 2009*

**Math**

solve for x without using a calculator: log5(3^x) = log25(9^(1-2x)) I don't know how to get rid of the logs for this one. Help? Thank you!
*November 15, 2009*

**Math**

What is the greatest common factor for 28 and 24?
*October 29, 2009*

**Math**

Ok, I worked it out, and so far i have this: cos^2x - cos x - sinxcosx / cosx + sinxcosx Now I just need some help with reducing?
*October 18, 2009*

**Math**

Solve this equation algebraically: (1-sin x)/cos x = cos x/(1+sin x) --- I know the answer is an identity, and when graphed, it looks like cot x. I just don't know how to get there. I tried multiplying each side by its conjugate, but I still feel stuck. This is what I have...
*October 18, 2009*

**Chemistry**

A piece of metal of mass 20.0g @ 100°C is placed in a calorimeter containing 50.7g of water at 22.0°C. The final temperature of the mixture is 25.7°C. What is the specific heat capacity of the metal? Assume that no energy leaves to the surroundings. Not sure how to...
*October 4, 2009*

**Math**

Evaluate sec(cos^-1(3/5) I'm pretty sure the answer is 5/3, but I'm a little thrown off by the cos^-1. What exactly does it mean? Thanks!
*August 13, 2009*

**Math**

Consider the function y=sqrt(1+cos2x)/2 (everything is under the square root) a. Can x take on any real value? b. How large can cos 2x become? How small? c. How large can 1+cos2x/2 become? How small? d. What are the domain and range of the original function? -- For A, I put ...
*August 12, 2009*

**Math**

Express the vector as a combination of the standard unit vectors i and j. v = AB where A = (10,-11) and B = (-11,8) I want to make sure I did this right: <-11-10, 8--11> = <-21, 19> So it's -21i + 19j? Thank you!
*April 25, 2009*

**Math**

Write a set of parametric equations in Quadrants I and IV for a semi-circle with a radius of 10. I'm kind of new at parametrics, so this is what was given to me: (x-h)^2 + (y-k)^2 = r^2 x^2 + y^2 = r^2 r = 10, y = rsint, x=rcost So, 10cost + 10sint = 100 The answer is ...
*April 22, 2009*

**History**

Where can I find some information on the American military's POV on dropping the bomb on Japan during WWII? Thanks!
*March 31, 2009*

**Math**

3^2x - 11(3^x) + 30 = 0 ; solve for x. I know that you can substitute 3^x with another variable like y to make it easier, so it looks like this: y^2 - 11y + 30 = 0 ...unless I did something wrong there. Help please? Thanks!
*March 21, 2009*

**Math - AMC 10/12**

What kind of calculator do you need for the AMC 10/12? I have a TI-89, is that okay? Thanks!
*February 24, 2009*

**Chemistry**

1. Al + Pb(NO3)2 ----> Al(NO3)3 + Pb 2. FeS + O2 ----> Fe2O3 + SO2 3. C3H8 + O2 ----> CO2 + H2O I need some help balancing these equations. Thank you very much!
*February 17, 2009*

**Chemistry (repost)**

Pb(s) + KNO3(aq) ----> No reaction HNO3(aq) + Sr(OH)2(aq) ----> H2O + Sr(NO3)2 NO3 being Nitrate, and (OH)2 meaning 2 Oxygen and 2 Hydrogen atoms in the second problem. The second two in the products of the second problem is a subscript for NO3. Are these correct? Thank ...
*January 31, 2009*

**Chemistry**

Pb(s) + KNO3(aq) ----> No reaction HNO3(aq) + Sr(OH)2(aq) ----> H2O + Sr(NO3)2 NO3 being Nitrate, and (OH)2 meaning 2 Oxygen and 2 Hydrogen atoms in the second problem. The second two in the products of the second problem is a subscript for NO3. Are these correct? Thank ...
*January 31, 2009*

**ecology**

what is a stamen
*January 20, 2009*

**Math**

Find an equation of the parabola with vertex at the origin that passes through the point (-36, 2) and opens to the left. I believe you start with (x-h)^2 = 4p(y-k) and plug in the given point and (0,0), and solve for p. I got y^2 = 144x. Is this correct? Thank you!
*January 2, 2009*

**Math - Algebra**

Solve the inequality. n-1/3n < n-4/3n-4 (it's actually less than or equal to) My first instinct is to multiply 3n, but that'll just give me squares and makes it harder to solve. I also thought about getting a common denominator, but I'm not sure. Thank you!
*December 29, 2008*

**Chemistry**

In the Periodic Table, why does Group 2 and 17 bond together so easily? ~thanks
*November 22, 2008*

**World History**

Where can I find some information about Indian Ocean trade around 650 CE? Thank you :)
*November 12, 2008*

**Spanish**

How do you conjugate "sugerir" in present tense? Thank you!
*September 23, 2008*

**biology**

what is the definition, positives, negatives, and ethical issues of genatically modify organisims? thank you, but i prefere if you provide me with exact answers limited in one page rather than a general website Do not repeat your posts. Repeating the posts will not get you any...
*November 24, 2006*

**biology**

what is the definition, positives, negatives, and ethical issues of genatically modify organisims? http://www.chatpress.com/gen_one.html
*November 24, 2006*

**environmental technology manegement**

what is the definition, positives, negatives, and ethical issues of genatically modify organisims? Since this is not my area of expertise, I searched Google under the key words "genetic modification advantage" to get these possible sources: http://www.bionetonline....
*November 24, 2006*

**science**

properties of sulphur?
*September 22, 2006*

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