Friday
April 29, 2016

# 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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