Wednesday
December 11, 2013

# Posts by FredR

Total # Posts: 108

Science
the formula for water is H2O. Therefore, two atoms of hydrogen are released for each atom of oxygen. You could test the gases by putting them in a balloon and seeing which one floats.

Geometry
circumference = pi*D = 10m, so D = 10m/pi = 3.183m radius = D/2 = 1.59m

precal log
4^(2x-5)=2^2*(2x-5) 8^(x-3)=2^3*(x-3) so 2(2x-5)=3(x-3) simplifying, 4x-10=3x-9 x=1

chemistry
1/2N2+3/2H2 => NH3 or 1/3N2+H2 => 2/3NH3 so 12*2/3 = 8 moles HN3

Math

trig
to convert degrees to rad, multiply by pi and divide by 180.

trig
I'm not sure I understand what angle the 56.4 degrees represents, but assuming it is the difference in horizontal azimuth to the pillar from the 1st setup to the 2nd setup then solution is: If the distance to the pillar is "P" then: tan(56.4)=10/P or P=10/tan(56....

trig
The three angles of a triangle equal 180 degrees. The third angle is 80 degrees. Therefore, it is not a right triangle.

trig
sin(a)/cos(a)=tan(a) tan(a)*cos(a)=sin(a)*cos(a)/cos(a)=sin(a)

trig
if c is one of the legs of the triangle then it equals four. If it is the hypotenuse then it equals: c=sqrt(5^2+3^2)

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