Wednesday

April 23, 2014

April 23, 2014

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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