Friday
October 31, 2014

Posts by Chip


Total # Posts: 29

Math
Sara has some fish, 2 birds, and 5 hamsters. She has 6 fewer hamsters than fish. How many fish does she have?
September 22, 2014

math
what number is 66 2/3% of 81?
April 30, 2014

Physics
In a Joule experiment, a mass of 1.00 kg falls through a height of 50.0 m and rotates a paddle wheel that stirs 0.600 kg of water. The water is initially at 15 degrees C. By how much does its temperature rise (in degrees C)?
September 23, 2013

physics
A cylinder with a piston contains 0.3 kg of water at 100 degrees C. What is the change in internal energy of the water when it is converted to steam at 100 degrees C at a constant pressure of 1 atm? The density of water is 1000 kg/m^3 and that of steam is 0.6 kg/m^3. The ...
September 23, 2013

physics
A flow calorimeter is used to measure the specific heat of a liquid. Heat is added at a known rate to a stream of the liquid as it passes through the calorimeter at a known rate. Then a measurement of the resulting temperature difference between the inflow and the outflow ...
September 23, 2013

7th grade math
Oh my gosh, I'm dying of laughter. Jessie, why don't you stop being a little snot and pay attention in class. 26/143 = x/100 You cross-multiply 26*100=143*x 2600=143*x Then you find x, as Ms.Sue tried so nicely to explain to you, by dividing 2600 by 143 (2600/143) ...
January 4, 2013

algebra ll
y = x^2 + 9x y = x*(x+9) at y = 0, x*(x+9)=0 This is only possible when x = 0 or -9.
July 6, 2012

Chemistry
Total is 100%, so assuming x is the fraction of Cu-63, (1-x) is the fraction of Cu-65. Atomic weight is the (weighted) average of all isotopes. Therefore you have: x*62.93 + (1-x)*64.93 = 63.55 x = 0.69. So you have 69% Cu-63 and 31% Cu-65.
July 6, 2012

geometry
The spacing got messed up... The first column is for P Second is for Q Third is for ~Q and the last is for P => ~Q
July 5, 2012

geometry
I'm assuming you're trying to say "if p, then not q". For this, the table should go like this: P Q ~Q P => ~Q T T F F T F T T F T F T F F T T
July 5, 2012

math
The slope between two points is: slope = (y2 - y1)/(x2 - x1) (0.6,0.5) = (x1,y1) and (0.2,-0.3) = (x2,y2). Plug in and solve for the slope.
July 5, 2012

physics
Frequency = (speed)/(wavelength) However! The speed of a wave is constant for a given medium (ex. air, water). Therefore doubling frequency halves the wavelength, but keeps speed constant.
July 5, 2012

physics
Same concept as for this question: "Doubling the frequency of a wave source doubles the speed of the waves"
July 5, 2012

physics, please help me, this question is hard
a. Vf^2 = Vi^2 + 2*a*d solve for Vi given Vf = 0 (speed at max height is 0), a = -9.81 m/s^2 and d = 3m. b. Once you know Vi, you can use Vf = a*t + Vi and solve for t. (once again, Vf = 0 since you're only considering the path of the ball from the top of the building to ...
July 5, 2012

math
The difference of cubes formula is: x^3 − y^3 = (x − y)*(x^2 + xy + y^2) Your x is x in this case and y = 8 (2^3). So you get: x^3 - 2^3 = (x - 2)*(x^2 + 2x + 4).
July 5, 2012

Math
A round pool implies the pool is a cylinder. The volume of a cylinder is: V = (pi)*r^2*h where r is radius and h is height. Rearranging the formula, you get: h = V/(pi*r^2) V = 48.2 and r = 3.2, so h = 1.5 feet.
July 5, 2012

Math
A cube with volume 216 has sides of length 6cm. The volume of a pyramid is (1/3)*A*h (where A is the area of the base and h is the height of the pyramid). Therefore, the volume is (1/3)*6*6*6 = 72 cm^3 (answer C).
July 5, 2012

Math
This can also be solved by doing: x-y = 88 min x*y. x = 88+y, so you get minimize x^2+88x, which can be done with calculus.
July 5, 2012

Math
-44 and 44.
July 5, 2012

math
(10 choose 4)*(14 choose 4) The general formula for n choose k is (n!)/(k!*(n-k)!).
July 4, 2012

Alegebra 1
If all the vertices of a triangle are on the circle and one side of the triangle is the diameter of the circle it is a right angle. Find the length of the diameter (AC) if Ab =8 and BC = 15.
March 10, 2011

geometry
If Jan takes exactly 30 minutes to walk to school each day, and her school is 2.3 miles away, what is her average walking speed (rounded to the nearest tenth)?
February 20, 2011

physics
The nine Ring Wraiths want to fly from Barad-Dur to Rivendell. Rivendell is directly north of Barad-Dur. The Dark Tower reports that the wind is coming from the west at 52 miles per hour. In order to travel in a straight line, the Ring Wraiths decide to head northwest. At what...
January 26, 2011

math
so is it (-3/4,-1/2)?
December 30, 2010

math
whats the vertex of 4y^2+4y-16x+13=0?
December 30, 2010

biology
its C i figured it out
October 26, 2010

biology
The structures in bryophytes that penetrate the ground and act like roots are a. xylem b. phloem c. rhizomes d. rhizoids
October 26, 2010

math
7 bats minimum all can see out of only 1 eye
October 26, 2010

physics
A train pulls away from a station with a constant acceleration of 0.44 m/s2. A passenger arrives at a point next to the track 6.2 s after the end of the train has passed the very same point. What is the slowest constant speed at which she can run and still catch the train?
September 19, 2010

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