# Posts by alk

Total # Posts: 13

**physics**

i have this problem, it asks: (a) With what speed must a ball be thrown vertically from ground level to rise to a maximum height of 50m? answer: 31m/s (b)How long will it be in the air?\ answer: 6.4s (c) Sketch graphs of y, v, and a vs. t for the ball. On the first two graphs...

*August 25, 2008*

**physics**

An elevator without a ceiling is ascending with a constant speed of 10m/s. A boy on the elevator shoots a ball directly upward, from a height of 2.0m above the elevator floor, just as the elevator floor is 28m above the ground. The initial speed of the ball with respect to the...

*August 24, 2008*

**math**

i still don't understand what you are saying. can someone show me the work.

*August 11, 2008*

**math**

i got help with this problem a couple days ago. the answer and explanation given made sense to me but on my list of answers it said the the answer is suppose to be: r=[-pih+sqrt(pi^2h^2+2piA)]/2pi if anyone can figure out how to get that thanks so much. the original problem is...

*August 11, 2008*

**math**

((2X)/(4pi))+((1-x)/2)=0, solve for x

*August 7, 2008*

**Math**

i understood the whole first question and then i understood the domain of the second question. i did get confused though when it came to finding the range because the teacher gave us the answers w/o explanations and it said that the range was all numbers except for 5/2. i'...

*August 7, 2008*

**math**

Rationalize the denminator in the expression: 1/(1+(sqrt of 3)-(sqrt of 5)) and thenn... A=2PIr^2 + 2PIrh *solve for positive r **PI is equal to 3.14etc.

*August 6, 2008*

**math**

questions involving domain and range... 1. Find the domain of the function f(x)=(3x+1)/(sqrt of (x^2+x-2)) andd. 2. Let f(x)= (absvalue(x))/x. Show that f(x)={ 1, x > 0 {-1, x < 0 Find the domain and range of f(x).

*August 4, 2008*

**math**

A circle is tangent to the y-axis at y=3 and has one intercept at x=1. a) Determine the other x-intercept. b) Find the equation of the circle. Thanks for helping!

*August 3, 2008*

**math**

For the circle x^2+y^2+6x-4y+3=0 how would i go about finding: a) the center and the radius b) the equation of the tangent line at the point (-2,5) any help is mch appreciated. thanks!

*July 18, 2008*

**apchem**

A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm pressure. (b) What ...

*January 27, 2008*

**ap chemistry**

thanks so much for your help!

*December 27, 2007*

**ap chemistry**

18. Answer the following question that relate to the analysis of chemical compounds. (a) A compound containing the elements C, H, N, and O is analyzed. When a 1.2359g sample is burned in excess oxygen, 2.241g of CO2(g) is formed. The combustion analysis also showed that the ...

*December 27, 2007*

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