Monday

April 21, 2014

April 21, 2014

Total # Posts: 36

**Geomety**

How do I find the image of O (0,0) after two reflections, first across x=a and then across y=b?

**Physics**

an object at rest explodes into three pieces of equal mass. one moves east at 20 m/s a second moves southeast at 30 m/s what is the velocity of the third piece??

**math**

A hobby shop has 4 times as manymodel airplanes as model helicopters.The total number of model airplanesand helicopters is 35. How manymodel airplanes does the hobby shophave?

**math**

beth travels 244 miles everyweek. she says she will travel 2,196 miles if she travels the same number of miles for the next 9 weeks.

**chemistry (buffer)**

If 5.00 mL of 1.60 nitric acid is added to a solution of 2.00 mmol thiocyanic acid (HSCN pKa=4.00) and 4.500 mmol calcium thiocyanide, assume a soluble salt- what is teh pOG of the resultant complex solution (of total volume .350L). I worked the problem out and ended up gettin...

**physics**

a body cools from 80 degrees to 50 degrees in 5 minuts. calculate what time it will take to cool from 60 degrees to 30 degrees?

**Chemistry**

I want to have the details of the experiment title: Determine the equilibrium constant of a reversible reaction involving the iodine and the tri iodate ion reaction and also determine the gibbs free energy of the reaction.

**math**

Sorry the "Total Items $$ Total" was supposed to be 3 columns.

**math**

Okay, I have figured this out. Total Items $$ Total Books 175-v 5 5(175-v) Videos v 6 6v Total 175 --- $910 5(175-v) + 6v = 910 875- 5v + 6v = 910 1v (or just v) = 910-875 v = 35, or 35 videos 35 videos at $6 each = $200 sold $910-200 = $710 left for books $710/$5 (books) = 14...

**math**

Used books are being sold at $5 and used videos are being sold at $6. There are 175 total items sold and a total of $910 collected. How many videos were sold?

**Math**

Reasoning. If you live 71mi from a river, does it make sense to say you live about 80 mi from the river? Explain

**science**

unscramble ecrfenine

**MATH grade 12**

Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!

** advance functions**

Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!

**Chemistry**

A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 55.6 kJ of heat. Before the reaction, the volume of the system was 7.60 L. After the reaction, the volume of the system was 2.00 L. Calculate the total internal energy change, Delta U, in kilojoules.

**Chemistry**

In lab we did thermochemistry, where we are supposed to find the heats of solution, heat change of calorimeter and molar heat solution of the salt. I calculated that the calorimeter constant for the water we had was 883.194 Joules. We took 1/10 of a mole of NH4Cl and tried to ...

**maths**

if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cos^2theta)(1+cos-^2theta) the answer should be 49/64 but i couldnt get that answer. can any one help?

**maths**

if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cost^2theta)(1+co-^2theta) the answer should be 49/64 but i couldnt get that answer. can any one help?

**PHYSICS-radiation**

Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80%...

**MATH/SCIENCE HELP**

PROBLEMS: 1. In a measurement of precipitation (rainfall), a raingauge with an orifice (collector) area of 30.50 in2 collects 1.30 litres of water over a period of 26 minutes and 45 seconds.[10] Calculate: - The depth (amount) of rain that fell (in mm). - The intensity (mm h-1...

**MATH/SCIENCE HELP**

A)The depth (amount) of rain that fell (in mm). b. The intensity (mm h-1) at which the rain fell. c. The volume (m3) of water that would have fallen on an area of 7.00 acres. d. The discharge in m3 s-1 that would occur if all the water ran off the area in part c. in 3.00 hours...

**MATH/SCIENCE HELP**

1. In a measurement of precipitation (rainfall), a raingauge with an orifice (collector) area of 30.50 in2 collects 1.30 litres of water over a period of 26 minutes and 45 seconds.[10] Calculate: a. The depth (amount) of rain that fell (in mm). b. The intensity (mm h-1) at whi...

**Science!! Please HELP**

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this grow...

**Science!! Please HELP**

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this grow...

**Math - please elaborate**

can someone please further explain my question on? it's just a farther bit down. The subject is "Math - help really needed" I think I almost got the answer, but I'm not sure where to go from there. really appreaite all the help so far as well; thank you. :)

**Math - help really needed**

I haven't learned what cot and csc are. Can I still solve this with just tan, cos, and sin?

**Math - help really needed**

but if I have identical denominators, why can't I just add the 1 to the tan^2X?

**Math - help really needed**

I'm really sorry. I don't want to sound stupid, but when I add tan^2x/tan^2x to 1/tan^2x I get 1+tan^2x/tan^2x and then the tans cancel out and I'm left with just one. Obviously, that's not correct, but I can't find my mistake.

**Math - help really needed**

okay, I'll try it out, thank you.

**Math - help really needed**

wait, for the first one if sin^2+cos^2=1, how did you even cancel some out?

**Math - help really needed**

oh, ok, I see. thank you all very much. I think I get it now, so hopefully I can actually get them on my own. :)

**Math - help really needed**

I'm sorry to double post; I don't want to seem impatient, but I really need help with this. Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=sinxtanx 1/sin^2x+1/cos^2x=1/sin^2xcos^2x 1/1-cos^2x+/1+cosx=2/sin^2x and (1-cos^2x)(1+1/tan^2x)= 1 I haven't even gotten...

**Math - help really needed**

Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=sinxtanx 1/sin^2x+1/cos^2x=1/sin^2xcos^2x 1/1-cos^2x+/1+cosx=2/sin^2x and (1-cos^2x)(1+1/tan^2x)= 1 I haven't even gotten 'round to sny of the quedtions because the first one is just so hard. I'm not really sure I...

**math**

15 percent of 50

**acids and alkalis**

Pls help me. Pls tell me some bases (alkelis)other than any cleaning products.

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