# Posts by Vonne

Total # Posts: 6

**Math**

The equation of a circle A(x^2+y^2)+Bx+Cy+9=0 that passes through (1,0), (2,-1) and (8,7). Find B. Thanks!

*August 23, 2012*

**Math**

The system 3x + ay = 0 (a-2)x + 5y = 0 has infinitely many solutions. What is the smallest possible value of a? Thanks!

*August 10, 2012*

**physics**

When you push a 2.05 kg book resting on a tabletop it takes 2.45 N to start the book sliding. Once it is sliding, however, it takes only 1.50 N to keep the book moving with constant speed. What are the coefficients of static and kinetic friction between the book and the ...

*September 30, 2010*

**physics**

A hot air balloon is descending at a rate of 2.4 m/s when a passenger drops a camera. (a) If the camera is 50 m above the ground when it is dropped, how long does it take for the camera to reach the ground? (s) (b) What is its velocity just before it lands? Let upward be the ...

*September 16, 2010*

**physics**

To find the height of an overhead power line, you throw a ball straight upward. The ball passes the line on the way up after 0.65 s, and passes it again on the way down 1.9 s after it was tossed. (a) What is the height of the power line? (m) (b) What is the initial speed of ...

*September 16, 2010*

**math**

in a family with two children, what are the probabilities of two boys, the first is a girl the second is a boy, neither is a girl, at least one girl, assuming that the birth of boys and girls is equally likely. Show steps

*December 9, 2009*

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