Thursday
July 24, 2014

Posts by Chip


Total # Posts: 28

math
what number is 66 2/3% of 81?

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)?

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 laten...

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 poin...

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) whic...

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.

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.

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

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

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.

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.

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

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 m...

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).

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.

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).

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.

Math
-44 and 44.

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

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.

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)?

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...

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

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

biology
its C i figured it out

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

math
7 bats minimum all can see out of only 1 eye

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?

Pages: 1

Search
Members