Thursday
October 2, 2014

Posts by Jen


Total # Posts: 3,269

physics
Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the electrons passing through ...
April 7, 2011

Economics
1. You read the following information about the economy: Real GDP up three percent from a year ago. Unemployment rate of 6.1 percent. Consumer Price Index up six percent from a year ago. Index of Leading Indicators up for the last six months. Prime interest rate of ten percent...
April 5, 2011

chemistry
can someone please explain to me in dummy language this question... Why is the graph of transmittance versus concentration not linear?... Thankyou very much
April 2, 2011

math
Milan's gas tank is 1/5 full. After he buys 6 gallons of gas, it is 7/10 full. How many gallons can Milan's tank hold?
March 23, 2011

physics
A backpack full of books weighing 43.0 N rests on a table in a physics laboratory classroom. A spring with a force constant of 150 N/m is attached to the backpack and pulled horizontally, as indicated in the figure. If the spring stretches by 2.30 cm, what is the coefficient ...
March 22, 2011

physics
a very thin piece of copper wire has an electrical resistance of 20,000 Ohms. You connect its ends to a regular 2.0 Volt battery. How much power does it draw? Let's assume that this little piece of wire initially contained one trillion (that's a one with 12 zeros) ...
March 20, 2011

trigonometry
please me to answer this question.because i will pass this coming monday march 21,2011.fin the diameter of three circle inscribed in a triangle. whose base is 50 cm.
March 17, 2011

trigonometry
please me to answer this question.because i will pass this coming monday march 21,2011.fin the diameter of three circle inscribed in a triangle. whose base is 50 cm.
March 17, 2011

trigonometry
please me to answer this question.because i will pass this coming monday march 21,2011.fin the diameter of three circle inscribed in a triangle. whose base is 50 cm.
March 17, 2011

trigonometry
what is the diameter of three circle inscribed in a triagle whose base is 50 cm.
March 17, 2011

chemistry
what is a common household example of a colloid, besides milk?
March 14, 2011

Geometry
If the diagonal of a square has a length of 10 suare root of 2 cm, find the area of the square and the perimeter of the square.
March 13, 2011

geometry
The diagonals of a rhombus are in 2:1. If the perimeter of the rhombus is 120cm, find the length of the diagonals.
March 13, 2011

Chemistry
How many moles of nitrogen are in 5.0×10−2 mole of quinine?
March 13, 2011

algebra
3-p=8p 3=9p 1/3=p
March 11, 2011

chemistry
I dont understand this zwitterion form . Here is the question. write the zwitterion form of the amino acid cysteins shown in the follwing figure. If the pI for cysteine is 5.1 at what pH will the zwitterions be the predominant form? Can you please show me step by step on how ...
March 9, 2011

chemistry
I am not understanding this molarity stuff. Can someone please show me step by step on how to solve this question? What is the molarity of 0.50 L of solution containing 40.0 g of CaCO3?
March 9, 2011

geometry
The height of a loading platform is 4 feet. Determin the length of the ramp if it makes a 32 degree angle with the ground.
March 7, 2011

Physics
A 1220 kg car rounds a circular turn of radius 19.2 m. If the road is flat and the coefficient of static friction between the tires and the road is 0.66, how fast can the car go without skidding?
March 4, 2011

math
2x + 4=4y + 4 Find the value of x.
March 3, 2011

science
what happens when an ocean wave hits an oil spill?
March 3, 2011

chemistry
If a 190 mg piece of gold (density =19.32 g/cm^3) is hammered into a sheet measuring 2.3 x 1.0 ft, what is the average thickness of the sheet in meters?
March 2, 2011

chemistry
How do you calculate, as an example, [Fe3+] which remained unreacted in a solution, i.e. the equilibrium molarity of Fe3+? The actual question being, on my part, what equation would you use to figure this out? How would you solve this?
February 23, 2011

math
-n-4 -6s 192-8n (-30)(-20)=600 14
February 21, 2011

math
repeat question, already answered
February 21, 2011

Math
Gina flew from Toronto to Chicago and back again. The average speed of the plane was 332 km/h to Chicago and 415 km/h back to Toronto. If the actual flying time for the round trip was 4.5 h, how far is it from Toronto to Chicago?
February 18, 2011

spanish
I believe el mayor is right, but I am unsure about the first one.
February 17, 2011

Physics
A 15.0 kg box is released on a 32 degree incline and accelerates down the incline at 0.30m/s sqaured ? find the friction force impeding its motion. What is the coefficient of kinectic friction?
February 15, 2011

Physics
a force of 48.0N is required to start a 5.Okg box moving across a horizonatl concrete floor.what is the coefficient of static friction between the box and the floor?If the 48.0-N force continues, the box accelerates at 0.70 m/s squared . What is the coefficient of kinetic ...
February 15, 2011

algebra
V=1/3*6300*7 solve for V The answer is V=14700 how do you change 1/3 to a decimal or use 1/3 to solve the equation?
February 14, 2011

math
A man borrows $50,000 towards the cost of a house. Compound interest is charge on the loan at 125 per annum. He agrees to pay back the loan in 25 equal installments, at yearly intervals, the first repayment being made exactly 1 year after the loan is taken out. Calculate the ...
February 13, 2011

TRIG
2sin@ + 3 = 2 2sin@ = -1 sin@ = -1/2 @ = 210, 330 convert to radians if desired
February 13, 2011

maths
let x be the number of green ones blue one = 6x
February 13, 2011

engineering physihcs
I need to create an Excel chart showing world oil reserves vs. time, which are both in columns and cannot find how to graph this in excel. thank you.
February 12, 2011

chemistry
2.36 L of an aqueous solution containing 39.0 g of KCl dissolved in pure water is prepared. The molarity of the solution is?
February 8, 2011

gen chem 2
In the chemical kinetics experiment, determine the dilution of the stock bleach solution. The bleach used will be around 5.5% (weight/volume). Convert this to molarity
February 8, 2011

algebra
5 1/3-3 5/6..make sure to change to common denominators
February 7, 2011

math
6 with 9 0's...6,000,000,000
February 7, 2011

Chemistry
how to figure The grams of protein in 1 cup of soup that has 98 {\rm Cal} with 6 {\rm g} of fat and 8 {\rm g} of carbohydrate
February 7, 2011

Chemistry
Which will evaporate faster, 50ml of 1.0m NaCl or 50ml of pure water?
February 6, 2011

College Chemistry
Consider a .0500m solution.HClO2such that36% of the molecules dissociated when dissolved in water. Calculate the vant Hoff factor for this solution is hclo2 is36% associated
February 6, 2011

physics
a 2.0kg block is pushed against a spring that has a force constant of 10 n/m. the spring is compressed 10 cm. when the block is released, it slides across a rough surface for 25 cm before it stops. find the coefficient of friction between the block and the surface.
February 6, 2011

Algebra
Flying against the wind, Lisa made the flight from Reno in 3 h with a steady airspeed of 400km/h. Returning later with a tail wind that had doubled in magnitude, she landed 225 km beyond the starting point in 3 h. What was the original wind speed? How far from Reno did she ...
February 6, 2011

math
I thought your answer was funny, anon. Brianna, do you know what bisect means? You need to look up that word if you don't.
February 2, 2011

Algebra- is my answer right
Simplify. (2b^-4 c^6)^5 I get b^20/32c^30 Is that right? Write your answer using only positive exponents.
February 1, 2011

Algebra- is my answer right
Thanks, I see what I did, I squared when adding to the right side
February 1, 2011

Algebra- is my answer right
Graph the Circle x^2+y^2+4x-2y-20=0 I get: (x^2+4x)+(y^2-2y)=20 (x^2+4x+4)+(y^2-2y+1)=20+16+4 (x+2)^+(y-1)^2=(40/2)^2 But I don't think its right can you help me with what I did wrong? Thanks
February 1, 2011

Algebra- is my answer right
I see what I did, Thanks
February 1, 2011

Algebra- is my answer right
Use the rational zeros theorem to list all possible rational zeros of the following. -2x^3-x^2-4x-5 I got +-1,+-5+-,5/2,+-1/2 Be sure that no value in your list appears more than once.
February 1, 2011

Algebra
logx1/64=-3 Solve for x
February 1, 2011

Algebra
The midpoint of (AB) is M = (1,3). One endpoint is A =(8,-2). Find the coordinates of the other endpoint B.
January 28, 2011

Algebra
Add: (2/3x^2-4x-1)+(1/3x^2-19x+28) Simplify as much as possible.
January 28, 2011

Algebra
I figured it out.
January 28, 2011

Algebra
Suppose that the functions q and r are defined as follows: q(x)=2x+1 r(x)=-2x^2+1 Find the following: (qOr)(4)= (rOq)(4)=
January 28, 2011

5th grade math
ok just subtract.first subtract the denominator the the numetator.ooo and ifyour teacher is picky like mine the reduce it
January 27, 2011

algebra2
48x3z5y - 36x3z3y4 + 48x2z5y The GCF of 48, 36, and 48 is 6; " x^3, x^3, x^2 is x^2; " z^5, z^3, z^5 is z^3; " y, y^4, and y is y (you figure it out because its the most they all have in common) 6x^2z^3y( ) Now take that out and see what's left. Post it if ...
January 26, 2011

math
No, Raluca, it's 3:2.
January 26, 2011

math
There are 15 boys. Out of 25 students, that means there are 10 girls. Reduce 15/10 for your answer.
January 26, 2011

math
What are the directions...?
January 26, 2011

math
Mick, take 14 objects (maybe pencils or paper clips) and try to split them in 2 equal groups. See if you're able to.
January 26, 2011

analogies
scripted? no idea..
January 26, 2011

Algebra
The polynomial function f is defined by f(x)x^4-3x^3-2x^2+4x+5. Use a graphing calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth
January 25, 2011

Math
A loan of $37,000 is made at 3%interest, compounded annually. After how many years will the amount due reach $49,000 or more? (Use the calculator provided if necessary.) Write the answer as a whole number. ****I get 1.03^10 = 49,724.91 So is the answer 10 years at 49,725.00?
January 24, 2011

Algebra
I get 1.03^10 = 49,724.91 So is the answer 10 years at 49,725.00?
January 24, 2011

Algebra
A loan of $37,000 is made at 3%interest, compounded annually. After how many years will the amount due reach $49,000 or more? (Use the calculator provided if necessary.) Write the answer as a whole number.
January 24, 2011

Math
Multiply. (-1/5) X(-7)X(4/7) Write your answer as a fraction in simplest
January 24, 2011

Math Please Help
Thank You so much!
January 24, 2011

Math Please Help
I still can't get it, I will just hit the I don't know button because I'm stressing over it to much.
January 24, 2011

Math Please Help
The answer cannot be in a radical form
January 24, 2011

Math Please Help
Solve for v. v+6/5=3/5v-7/3 Simplify your answer as much as possible.
January 24, 2011

Algebra
f(x)=4x^-5x f(0) f(-1) f(2) All you have to do is put the number given in for x. I will do the first one for you. 4(0)^-5(0) 0^0=1
January 23, 2011

College Algebra
Ok I will try to figure it out and ask if I need anymore questions. thanks for your help
January 22, 2011

College Algebra
Please help me Divide. (9x^3-10+19+6x^4)/(-2x^2+3x-3) Write your answer in the form Q(x)+ R(x)/ -2x^2+3x-3, where Q(x) is the quotient and R(x) is the remainder.
January 22, 2011

pre algebra
3w+2+3w=-4+9 6w+2=5 6w=3 w=1/2 Now put 1/2 back into the original problem. 3(1/2)+2+3(1/2)=-4+9
January 22, 2011

math
10 * 3 = ? Count by 10's three times.
January 21, 2011

math
I would round by doing 20 * 30, since 25 is exactly halfway between. 2 * 3 = 6, put 2 0's on the end..600
January 21, 2011

5th grade
Which of those numbers do you see the most often? That is your mode. Example: 1, 3, 6, 1, 2, 3, 6, 3..your mode is 3 because it occurs most often.
January 20, 2011

physics
You're at a Red Rocks concert on a cold January evening. The temperature is -8 degrees Celsius and you've got amazing front row tickets, the players are only 5.5 m away. How long does it take for sound to arrive to you from the stage? Calculate your answer in seconds,
January 20, 2011

English
1. Good. summer house? cottage? 2. Any 3. Any 4. bobsledding, not I was involved in
January 20, 2011

Math - Calculus
Integration of (sinx + cosx)^2 from 0 to pi/2. I get pi/2 + 1 as my final answer... wondering if that's correct?
January 19, 2011

physics
a 2kg mallet is dropped from a height of .6m onto a nail, driving it 3.5 cm into the wood. What is the average force exerted by the mallet on the nail? thanks
January 19, 2011

Chemistry
A 10.8g sample of a gas has a volume of 5.25L at 25 degrees Celsius and 766mmHg. If 2.3g of the same gas is added to this constant 5.25L volume and the temperature raised to 68 degrees Celsius, what is the new gas pressure?
January 18, 2011

Math
12:15
January 17, 2011

alegebra 2
What are the directions...
January 17, 2011

Math
In a mathematics olympiad there are 20 finalists. In how many ways can three equal prizes be awarded, assuming that two prizes cannot be given to one finalist? In how many ways can a first, second and a third place be awarded? (I understand that Permutations and Combinations ...
January 17, 2011

physics
A model rocket leaves the ground, heading straight up at 47 m/s. (a) What is its maximum altitude? m What are its speed and altitude at each of the following times? (b) 1 s m/s m (c) 4 s m/s m (d) 8 s m/s m
January 16, 2011

chem
the gap between two brain cells is 0.0020 nm. how many meters is this
January 15, 2011

math
13c+7d=99.8 12c+7d=84.11 Multiply the 2nd equation by -1 13c+7d=99.8 -12c-7d=-84.11 c= Plug that back into either original equation to solve for d.
January 15, 2011

English
1 is kind of awkward. I would change come to take.
January 14, 2011

pre algebra
the midpoints of each side of triangle NOT are connected to make a smaller triangle inside triangle NOT. If the area of triangle NOT is 16 in squared, what is the area of the smaller triangle?
January 13, 2011

algebra
what is the height of a solid with a volume of 120m3 and a base area of 30 m2
January 12, 2011

English
How do I write an outline for a paper?
January 12, 2011

Spanish
You have to post it first.
January 12, 2011

math
300 * 3 = 900
January 11, 2011

Math
They were different size pizzas..
January 10, 2011

math geometry ITT
All of the angles in a triangle total 180, so 180-40=140, 140/2=70
January 10, 2011

Math
2,300-2,500=?
January 9, 2011

7th Grade
Z+5/7=3 z=3-5/7 z=?
January 9, 2011

com170
Also: definitely, not defiantly lose, not loose
January 9, 2011

spanish
If you are struggling, maybe write it in English first, and then work on translating it to Spanish. You don't need "examples" of me telling you what I did last week. Just be sure that you understand when you need to use the preterite. If not, re-read that section...
January 8, 2011

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