Tuesday

September 27, 2016
Total # Posts: 54

**physics**

if you see the flash of a lighting bolt and 3 seconds later you hear the clap of thunder. how far away was the lighting bolt?

*September 26, 2016*

**Maths**

In a test for every 6 answers carlene got correct, she got 2 wrong. She got 54 correct answers. 1 how many questions did the test have? 2 express the number of questions she answered correct as a percentage.

*March 28, 2016*

**physics**

12km

*March 10, 2015*

**chemistry**

2Al (s) + 3Cl2 (g) 2 AlCl3 (s) i)obtain the limiting reagent. when 2.00 mole of Cl2 (g) is reacted with 54.3 g of Al (p). ANSWER : Cl is limiting reagant. 54.3gAl(p)/27 = 2.01AI(P) Initial = 2.01 mol 2 mol divied = 2.01/2 2/3 = 1.005 =0.67 cl is smaller than al . can ...

*November 23, 2014*

**Science Project: Teeth**

What can I write in the discussion center of my paper in APA Style? Before doing an experiment?

*October 23, 2014*

**Science: Teeth**

I'm doing a science project on how various acids affect tooth enamel. I'm planning to put the teeths in separate containers and fill 5 containers with coca cola, and 5 others with a citric acid drink. I'm also planning for two weeks to examine the teeths. What can ...

*October 22, 2014*

**PHYSICS**

an airplane and a helicopter leave an airport in montana at the same time.The aircrafts velocities:v=225mph@20 degree,and v=102mph@49 degree.If these velocities are maintained which craft will cross the borderinto canada first? or do they arrive at the same time. Try the ...

*September 26, 2014*

**AP Physics**

a weather station releases a weather balloon.The balloon's buoyancy accelerates it upward at 15m/s sq.At the same time,a wind accelerates it horizontally to the right at 6.5m/s sq.What is the resulting acceleration

*September 26, 2014*

**Chemistry**

What is the normal boiling point in ∘ C ^\circ {\rm C} of a solution prepared by dissolving 1.50 g {\rm g} of aspirin (acetylsalicylic acid, C 9 H 8 O 4 {\rm C}_{9}{\rm H}_{8}{\rm O}_{4}) in 75.00 g {\rm g} of chloroform (CHCl 3 ) ({\rm CHCl}_{3})? The normal boiling ...

*February 4, 2014*

**Math**

if you know the lcm of 4 and 5, how could you find the lcm of 40 and 50

*December 17, 2013*

**Reading**

Can I please get a personification in the poem daffodils by William Wordsworth

*October 26, 2013*

**physics**

A meteoroid is speeding through the atmosphere, traveling east at 24.5 km/s while descending at 11.6 km/s. What is its speed, in km/s?

*September 18, 2013*

**chemistry**

How many grams of NaOH would be needed to react with 199 g of HCl? NaOH + HCl --> NaCl + H2O

*July 15, 2013*

**chem**

What mass of KCl in grams is formed when 2.00 lbs of KC103 is decomposed? KClO3 --> KCl + O2

*July 15, 2013*

**College Chemistry**

Calculate activities of Ca2+ and F- and the solubility of fluorite (CaF2) in pure water at 25C without regard to possible hydrolysis. Assume that all activity coefficients are equal to one. Express the solubility of fluorite in terms of mol/L and g/L.

*March 13, 2013*

**English**

It's A

*March 13, 2013*

**History**

D) sent to american ""concentration-like" camps

*January 24, 2013*

**Spanish (please help)**

yo hago ellos hacen nosotros hacemos

*January 24, 2013*

**spanish**

Mi maestra favorita se llama _____ y la clase que ella enseña es_____. just fill in the blank with a your fav teachers name and subject she teaches

*January 22, 2013*

**Spanish.**

El caballo fue importante para los conquistadores Hernán Cortes conquisto el imperio azteca El conquistador de Peru fue francisco Pizarro

*January 16, 2013*

**spanish III**

1. Son ___nuestras____ tijeras : it is nuestras because the scissors are feminine and so the ours has to be female 2. Nuestros : very close you just have to change the nosotros to nuestros since it is "our" cats not "we" cats 3. "su" is correct :...

*December 15, 2012*

**Calculus(Urgent help)**

f(x)=x^3-3x^2+3x+1 near 2 (at a=2) A. Use Linear approximation to approximate. b.is this underestimate or overestimate? Justify answer. C.Approximate f(2.25) using the linear approximation and compare the answer with the exact value. Thanks.

*November 7, 2012*

**usm**

A volume of 10.0 of a 0.190 solution is titrated with 0.770. Calculate the volume of required to reach the equivalence point.

*October 29, 2012*

**Calculus (Urgent Help)**

The graph of y=cos x * ln cos^2x has seven horizontal tangent lines on the interval [0,2pi]. Find the x-coordinate of all points at which these tangent lines occur.

*October 25, 2012*

**genetics**

Also, how would this affect the connection of DNA and the histones?

*October 14, 2012*

**genetics**

What kinds of amino acids on histone tails are able to be phosphorylated and why?

*October 14, 2012*

**physics**

a carnival ride is made so that at a certain point the floor can be lowered and the people inside dont fall. if this carnival ride has 2.0 m radius and rotates 1.1 times per second: a) find the speed of the ride. B) find the centripetal acceleration of a rider C) what produces...

*April 6, 2012*

**Spanish**

i dont get it

*March 25, 2012*

**Spanish**

Fill in the blank. 1. Los amigos están viajando por un país europeo. Los amigos están viajando por _____________________. 2. Están haciendo un viaje que no cuesta mucho. Están haciendo un viaje _______________. 3. Lo están pasando muy ...

*March 25, 2012*

**spanish**

Yo me lavo ______ manos y ______ cara. yo cepillo los dientes y yo cepillo me pelo. Yo me pongo ______ ropa

*March 25, 2012*

**physics**

10.07km

*August 30, 2011*

**7th grade**

The economic theory that the prosperity of a nation depends upon its supply of capital, and that the volume of the world economy and international trade is unchangeable.

*October 16, 2010*

**Algebra 2**

can someone show me how to do it step by step please! Use a graph and table to solve each system. check your answer {y+x=5 {3x-5y=-1

*October 16, 2010*

**math**

yes it looks right to me Because all you needed to do is to plug in the value 39cm for x and calculate the answer, so u are correct.

*March 25, 2010*

**Math - Implict differentiation**

How do I find the value of d^2y/dx^2 for the function defined implicitly by xy^2 + y = 2 at the point (1,-2)?

*March 25, 2010*

**Computer Science**

What are two dimensional arrays and can they be seen anytime as a one dimensional array?

*March 16, 2010*

**Math**

Differentiate in terms of x: 1] y = cos^3 5x 2] y = sec^2 3x

*March 11, 2010*

**Rhetoric Writing**

Hey I am doing a Process Analysis assignment. I chose "How a magician saws a woman in half" I need some help in finding information for this topic as it relates to the stages and steps taken in doing this magic. Also i will like to find some visual of how the magic ...

*February 19, 2010*

**math**

Somtething seems to be wrong with this question to me. This is what i got:[substitution method] y+2x=3 (1) y+2x=-4 (2) from equation (2)y+2x+-4 => y=-4+2x call this equation (3) substitute equation (3) in equation (1) -4+2x+2x=3 4x=7 x=7/4 for x =7/4, substitute x in ...

*February 17, 2010*

**math**

ok here is what i got: 8x+5y=184 (1) x-y=3 (2) from equation (1) 8x+5y=184 => 8x=184-5y x=184-5y/8 call this equation (3) substitute equation (3) in equation (2) 184-5y/8-y =3 (184/8)-(5y/8)-y=3 (184/8)-(13y/8)=3 (184/8)-3=13y/8 160/8=13y/8 20=13y/8 [cross multiply] 20(8)=...

*February 17, 2010*

**algebra **

This is the substitution method y-2x=8 (1) 2y+x=1 (2) From equation (1) y-2x=8 would now be y=8+2x you can call this equation (3) so now, we substitute equation (3) in equation (2) 2(8+2x)+x=1 16+4x+x=1 16+5x=1 5x=1-16 5x=-15 x=-15/5 x=-3 for x=-3, substitute it in equation (3...

*February 17, 2010*

**susbstitution method**

Well these would be two equation so: y=6-x (1) y=x+2 (2) so, substitute equation (1) y=6-x into equation (2) therefore, 6-x=x+2 6-2=x+x 4=2x 4/2=x 2=x for x=2, substitute x in equation (1) y=6-2 y=4 x=2 , y=4

*February 17, 2010*

**Maths (limits)**

how do i evaluated these limits: lim x --> 3 ((square root of x^2 +16)- 5)/(x^2 - 3x) lim x--> to infinity (2+ 100/x)

*February 17, 2010*

**arithmetic**

oh don't worry drwls, i now understand. thanks!

*February 17, 2010*

**arithmetic**

sorry i mean the top looks like a quadratic do i break it down or just leave it as it is and just plug in x=5 into the entire equation?

*February 17, 2010*

**arithmetic**

so drwls do i have to change the top into something similar or just plug in x=5 into the entire equation.

*February 17, 2010*

**arithmetic**

ok lemme write it over then: How do i find the lim x-->5 (x-3-2x^2)/(1+3x)

*February 17, 2010*

**arithmetic**

how do i evaluate this limit: lim x tends to 5 x-3-2x^2/1+3x

*February 17, 2010*

**arithmetic **

Hey thanks a lot Reiny. I got it..

*February 11, 2010*

**arithmetic**

How do i find the common ratio, when the 1st, 2nd and 7th terms of a A.P with common difference 2 are the first three terms of a G.P .

*February 11, 2010*

**math**

22...quotient of 18 and 2 = 9 sum of 22 and 9= 31...sbtracting the quotient (which is 9) from the sum..would equal 9.

*January 28, 2010*

**science**

A 50 kg skier is pulled up a frictionless ski slope that makes an angle of 8 degrees with the horizontal by holding onto a tow rope that moves parallel to the slope. Determine the magnitude of the force of the rope on the skier at an instant when a) the rope is moving with a ...

*November 12, 2006*

**Science**

A car weights 1.30 X 10^4 N is initially moving at a speed of 40km/h when the brakes are applied and the car is brought to a stop in 15m. Assuming that the force that srops the car is constant. find a)magnitude of the force b)time required for the change in speed. If the ...

*November 12, 2006*

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