Tuesday
July 29, 2014

Posts by Louie


Total # Posts: 14

trigonometry
VERIFY:(1-sinx)/(1+sinx)= sec^2x-2secxtanx+sec^2x-1

chemistry
Never mind, I figured it out!

chemistry
We used 1g of MgO and .5g of Mg for the experiment. 250ml of 1M HCL was also used.

chemistry
I'm trying to figure out what went wrong during my freshman chem lab. We were figuring out the enthalpy of formation of MgO(s). MgO(s) + 2H+(aq) -> Mg2+(aq) + H2O(l) dHrxn = -334.83kJ/mol Mg(s) + 2H+(aq) -> Mg2+(aq) + H2(g) dHxrn = -1105kJ/mol H2(g)+ 1/2O2(g) -> H...

maths (trig)
tangent of theta is opposite / adjacent. So your theta (angle) here is 50, your opposite is 27, and we don't know the adjacent. So do simple algebra & bring x to the other side by multiplying so you have tan50 * x = 27, now divide tan50 * x by tan50 to get x by itself. Now...

maths
What direction is the bee traveling? Anyways, i don't know...But the trains will collide in exactly 1 hour since the one is going 30 and the other 20. Their distance is 50 km apart. Is it asking if the bee is going 80km/hr, how long will it take to travel 50 km? If so then...

trigonometry
^Yeah theta has to be in degrees, or radians. Sq rt of 15 can't be right

physics
Use your kinematic equations. You know Vix, Ax, Then you'll need to find Vfx

Chemistry
I remember this from last year - you should have a table of the heat of enthalpy somewhere in your book. From this you'll need to get the values of delta H (heat) of each mixture. The left side (HCl + NaOH) is the reaction and the right side is the result - you'll lear...

math
It was kind of windy the other day bring the temperature from -10 degrees centigrade to 18 degrees centigrade in 24 hours. How much did the temp. rise in 24 hours? on average, how much per hour did the temp. rise?

Physics
g=0.02

history
what is difference between political and economical?

socual studies
what is the second largest exporter of rice

algebra 2
Evaluate the expression (40/2+i) + (35/2-i). What steps do I take in order to find this answer?

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