Saturday
May 18, 2013

# Posts by kelly

Total # Posts: 1352

Chemistry
Calculate the final pressure on the addition of 2.0 g He(g) to a vessel of 10.0 L fixed volume already containing O2(g) at 25°C and 740 mm Hg

Learning through Play
One of the parents in your school says, “I really enjoyed coming to Parents’ Night last week and seeing all the things the children are doing. I was particularly interested in your comments about the materials which enhance cognitive abilities. Why is it so much bett...

Calc- Trig Substitution
integral of dx/square root(x^2-64) My answer is: ln (x/8 + square root(x^2-64)/8) +c is this right?

physics
A model of a helicopter rotor has four blades, each 3.40 {m} in length from the central shaft to the tip of the blade. The model is rotated in a wind tunnel at 580 {rev/min}. What is the radial acceleration of the blade tip, expressed as a multiple of the acceleration g due to...

chemistry
how many times a proton is heavier than an electron

Math
Write an addition problem in which, when the addends are rounded to the nearest ten, the sum is 90. Then explain how you use estimation to solve the problem.

physics
A skydiver jumps out of a hovering helicopter, so there is no forward velocity. Use this information to answer questions 1 to 9. Ignore wind resistance for this exercise. What is the skydiver's acceleration?

functions 12
after i solve for x then that is my answer? so x=1/3,-1

functions 12
so would it be (3sinx-1)(4sinx+4)=0?

functions 12
solve 12cos^2X=8+13sinX between the window of -360 ¡Ü x ¡Ü 360

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