Friday
December 13, 2013

# Posts by Celina

Total # Posts: 143

math
the arc length and central angle of a circle are 10cm and 80degrees respectivly. what is the length of the radius?

Physics
The parabolic TV antenna recieves electromagnetic waves from satellites. What is special about these rays?

functions
a square has an area of 100 cm^2. how much bigger is the square's circumscribed circle than the inscribed circle?

Physics
If you can see the face of a friend who is underwater, can she also see you? Please explain. Thanks :)

Physics
A ray of light enters a glass block from air at an angle of incidence of 50 degrees. The angle of refraction is 30 degrees. What is the refractive index of the glass? What is the value of critical angle for this glass? Thank you :)

calculus
Use the limit process to find the area of the region between the graph of the function f(x)= x^3 and the x-axis on the interval [0,2]

calculus
Write the definite integral for the area of the region bounded by the grpahs of y=9-x^2 and y=0

chemistry
a chemical reaction occuring in a cylinder equipped with a moveable piston produces 0.58 mol of a gaseous product. If the cylinder contained 0.11 mol odf gas before the reaction and had an initial volume of 2.1 L, what was its volume after the reaction

chem
indigo C16H10N2O2 (numbers are suppose to b as a subscript) is the common name of the dye that gives blue jeans their characteristic colour. Calculate the mass of oxygenin 25.0g og indigo. show your work.

chemestry grd 11
A typical soap molecule consists of a polyatomic anion associated with a cation. The polyatomic anion containd hydrogen, carbon & oxygen. One particular soap molecule has 18 carbon atoms. it contains 70.5% carbon, 11.5% hydrogen, and 10.4% oxygen by mass. It also contains one ...

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