Wednesday

December 7, 2016
Total # Posts: 582

**chemistry**

How do I construct an energy level diagram for the hydrogen atom. I have all the energies, but I do not know how to make the diagram.

*March 3, 2012*

**Calculus based physics**

A particle travels along a path described by the function y=0.2x^3. The exponent of velocity is given by vx=(5t^2)ft/s. When t=0, x=y=0, find the particle's distance from the origin and the magnitude of its acceleration when t=1s.

*February 27, 2012*

**chemistry**

You are a chemist requested to review and analyse certain debris found on thebottom of aboot found in a crime scene. The debris contains metal fragments. If you identify the metal fragments---it will help the detctive identify the locations traveled by the person who did the ...

*February 26, 2012*

**chemistry**

You are a chemist requested to review and analyse certain debris found on thebottom of aboot found in a crime scene. The debris contains metal fragments. If you identify the metal fragments---it will help the detctive identify the locations traveled by the person who did the ...

*February 26, 2012*

**Chemistry**

A line in the infrared region of the hydrogen spectrum has a wavelength of 1.875 micro meters. What is the transition responsible for this wavelength?

*February 25, 2012*

**chemistry**

A line in the infrared region of the hydrogen spectrum has a wavelength of 1.875 micro meters. What is the transition responsible for this wavelength?

*February 25, 2012*

**chemistry**

Al(NO3)3 + NH3 --> ?

*February 24, 2012*

**English**

What is the subject and verb in the sentence below: The company offered a fifty dollar rebate on every energy efficient refridgerator bought during the month of June.

*February 16, 2012*

**math**

aaron is skipping stones across a pond.(A "skip"is a short bounce in the water.)The first stone skips 1 time, the second skips 2 times, the third stone skips 4 times,and the fourth stone skips 8 times. if this patten continues,how many total skips will the 10th stone...

*February 5, 2012*

**math**

aaron is skipping stones across a pond.(A "skip"is a short bounce in the water.)The first stone skips 1 time, the second skips 2 times, the third stone skips 4 times,and the fourth stone skips 8 times. if this patten continues,how many total skips will the 10th ...

*February 5, 2012*

**math**

aaron is skipping stones across a pond.(A "skip"is a short bounce in the water.)The first stone skips 1 time, the second skips 2 times, the third stone skips 4 times,and the fourth stone skips 8 times. if this patten continues,how many total skips will the 10th stone...

*February 5, 2012*

**math**

each of the 15 student council members of Blakemore Elementary School is responsable for telling exactly 2 other students about the upcoming school pep assembly. Each of those 2 is then responsable for telling 2 other students. It takes 15 minutes for each round of stundents ...

*February 5, 2012*

**chemistry**

In comparing the phase diagram for water with that of a solution of sugar in water, all of the following decrease except a) the vapor pressure b) the boiling point c) the freezing point d) the triple point

*February 3, 2012*

**chemistry**

so b?

*February 3, 2012*

**chemistry**

When 7.50 grams of iodine (I2) is added to 48.7 grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is a) 13.3 % b) 15.6 % c) 60.7 % d) 2.96 % e) 86.0%

*February 3, 2012*

**multiplication and arrays**

strategy practice explain hoe you can multiply 3x24 by using arrays. then give the product.

*February 1, 2012*

**math/estimating products**

an arena seats 7,893 people.The circus is in town and all of the tickets have been sold. If the circus has 4 performances, about how many tickets were sold?

*January 31, 2012*

**algebra**

How would learning how to solve logical problems, help you in your real life?

*January 30, 2012*

**algebra**

Suppose that a quadratic equation had two x-intercepts. How could you use the intercepts to find the vertex?

*January 30, 2012*

**algebra**

When using the quadratic formula, why is only necessary to examine the discriminant to determine if the equation only has real number solutions?

*January 30, 2012*

**Science**

A traffic light turns green, a car accelerate from rest and cover 10m in 4s . What is the acceleration of the car , assume uniform acceleration

*January 30, 2012*

**algebra**

When using the quadratic formula, why is only necessary to examine the discriminant to determine if the equation only has real number solutions?

*January 30, 2012*

**math**

If sin(θ) = -1/√2, find sin2(θ). (Recall that sin2(θ) means (sin(θ))2.) sin2(θ) =

*January 27, 2012*

**Trig**

tan(θ) = a (a ≠ 0), find cot(θ).

*January 27, 2012*

**Math**

Point G is the centroid of triangle ABC. Use this given information to find the value of X. CG =3x+7 and CE= 6x FG = x+8 and AF = 9x - 6 BG = 5x -1 and DG = 4x -5

*January 18, 2012*

**english**

I'd really appreciate if someone could check my answers for me. Thank you.

*January 9, 2012*

**english**

My answers are marked with an *.

*January 9, 2012*

**english**

1)In "The Love Song of J. Alfred Profrock," what mood is created by a setting in which the central character is concerned with the direction of his life? a)cheerful and exhilarating b)introspective and indecisive* c)honey and reassuring d)impersonal and chilling 2)...

*January 9, 2012*

**English**

I did check my answers with * beside each one.

*January 9, 2012*

**Physics**

*thanks

*January 9, 2012*

**Physics**

ohhh I see, thank Bob!

*January 9, 2012*

**Physics**

Hello, During a lab where you race 2 cars downward on a 30* angle slope, we got graphics of the different energies in play. (Gravitational, kinetic and Total in depending on time). Afterwards, we need to answer this question: Calculate non-conservative work exerted by the ...

*January 9, 2012*

**Computing**

I need help with my hp530 laptop.i reloaded the os to winxp.the agp texture acceleration is disabled how can i fix these?thanks

*January 9, 2012*

**Canadian History**

1. Who gave Jim Sinclair a crucial piece of advice early in his career? 2. What (or who) connects the current drug store chain, London Drugs, to the gold rush era of British Columbia?

*December 5, 2011*

**math**

make up a set of at least twelve numbers that has the following landmarks. minimum:50 median:54 maximum:57 mode:56

*December 2, 2011*

**physics**

For no apparent reason, a poodle is running counter-clockwise at a constant speed of 5.40 m/s in a circle with radius 2.3 m. Let v_1 be the velocity vector at time t_1, and let v_2 be the velocity vector at time t_2. Consider change in v = v_2- v_1 and change in t = t_2 - t_1...

*November 28, 2011*

**physics**

A ball, of mass 0.13Kg, is held on the inside of a smooth hemispherical bowl at a height 0.25 m above the base. It is then released. Assuming there is no friction, the acceleration due to gravity, g, is 10 m/s2 and the potential energy is zero at the base of the bowl - What is...

*November 22, 2011*

**Biology**

What is the maximum number of different blood types the children of a man with blood type A and a woman with blood type B could have? A. One B.Two C.Three D.Four I think it's D, but I'm not sure. Help would be appreciated.

*November 21, 2011*

**geometry**

i don't know i need the answer to

*November 17, 2011*

**Biology**

Each phenotype can only be represented by a single genotype. True or False? Help would be appreciated, thanks in advance!

*November 15, 2011*

**trig**

What is the exact value of 19 pie divided by 12.

*November 15, 2011*

**Consumer Math**

Ricki Cohn Encyclopedia sales Commission rate: 11% Month’s sales: $2,550 What is the monthly commission?

*October 26, 2011*

**pyhsics**

A ball with a mass of 0.8 kg is kicked up the ramp with an initial speed of 22 m/s. What is the speed [m/s] of the ball at the top assuming no friction? Angle from which ball is kicked is 23 degrees and the horizontal leg is 7 feet long.

*October 18, 2011*

**PHYSÝCS**

Find the speed of a satellite in a circular orbit around the Earth with a radius 3.65 times the mean radius of the Earth; RE= 6.37·103 km ME= 5.98·1024 kg

*October 17, 2011*

**physics**

A marble block of mass m1 = 500.1 kg and a granite block of mass m2 = 237.4 kg are connected to each other by a rope that runs over a pulley, as shown in the figure. Both blocks are located on inclined planes with angles á = 35.3 degrees and â = 56.7 degrees. Both...

*October 17, 2011*

**physics**

As shown in the figure, a block of mass M1 = 0.470 kg is initially at rest on a slab of mass M2 = 0.850 kg, and the slab is initially at rest on a level table. A string of negligible mass is connected to the slab, runs over a frictionless pulley on the edge of the table, and ...

*October 17, 2011*

**Physics**

In the figure below, m1 = 3.1 kg, m2 = 5.8 kg, and the coefficient of kinetic friction between the inclined plane and the 3.1-kg block is μk = 0.27. Find the magnitude of the acceleration of the masses and the tension in the cord. The incline is at at 30 angle.

*October 12, 2011*

**Physics**

The target is to be dropped from the point A at t = 0, the same moment as the gun is ﬁred. The bullet hits the target at a point P. Let the initial speed of the bullet be v0 = 106 m/s, let the angle between the vector v0 and the horizontal (x) direction be θ = 57.3...

*September 30, 2011*

**Physics**

i know i have to find the x component and y component in this equation

*September 30, 2011*

**Physics**

The target is to be dropped from the point A at t = 0, the same moment as the gun is ﬁred. The bullet hits the target at a point P. Let the initial speed of the bullet be v0 = 106 m/s, let the angle between the vector v0 and the horizontal (x) direction be θ = 57.3...

*September 30, 2011*

**Algebra 2**

It seems so You have to have a little faith in yourself you should plug it in and see for yourself

*September 30, 2011*

**physics**

thank you

*September 30, 2011*

**Precalculus**

Suppose 3 mg of a drug is injected into a person's bloodstream. As the drug is metabolized, the quantity diminishes at the continuous rate of 6 % per hour. Find a formula for Q(t), the quantity of the drug remaining in the body after t hours. Find approximations to two ...

*September 21, 2011*

**programming**

2-5 Grade Determination is says " Write a program that will input three test scores. the program should determine and display their average. the program should then display the appropriate letter grade based on there average. the letter grade should be determined using a ...

*September 21, 2011*

**A L G E B R A H ELP MS SUE.**

Answer

*September 20, 2011*

**Engineering**

It is found that ozone reaction in water nearly follows first-order kinetics in ozone concentration decreases by 50% in 12 minutes (t1/2 = 12 min). A water supplier wants to inject ozone into a pipe bringing water to thee water treatment plant to pre-disinfect the influent. ...

*September 19, 2011*

**Environmental Engineering**

Consider the air over a city to be a box 100km on a side that reaches up to an altitude of 1.0 km. THe air is blowing into the box along one of its sides with a speed of 4 m/s. Suppose an air pollutant with a reaction rate of K = 0.20/hr is emitted into the box at a total mass...

*September 19, 2011*

**math**

A store sold 64 sweatshirts one day. Of these, 12 were gray. The store manager plans to order 400 more sweatshirts. Based on the data, how many gary sweatshirts should the manager order?

*September 15, 2011*

**math**

352/4=88

*September 15, 2011*

**Physics**

A ball is thrown straight up and passes point B(at a height of 45.6m above its starting point O) in 4.9s What was its initial speed? The acceleration of gravity is 9.8m/s^2 Answer in units of m/s. I think the answer is -14.7m/s but im not sure since you probably cant have ...

*September 10, 2011*

**Physics & Gravity**

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 51 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m would ...

*September 9, 2011*

**accounting**

1. Please refer to the worksheet below. Trial Balance Adjustments Adjusted Trial Balance Income Statement Balance Sheet Account Title Dr. Cr. Dr. Cr. Dr. Cr. Dr. Cr. Dr. Cr. Cash $1,700 $1,700 $1,700 Accounts receivable 8,500 $2,000 10,500 10,500 Supplies 100 $80 20 20 ...

*August 15, 2011*

**Reading**

What Does It Mean When They Say Death Before Dishonor

*August 7, 2011*

**Poetry**

Decide which word from the word bank belongs in each blank in the statements that follow. bland / contaminated / devastated / punitive / transcend / concretely / convey / procrastinating / spontaneous / uniqueness 1. Even though I know doesn't pay, I still put off until ...

*June 20, 2011*

**math**

If the store purchases an item at a wholesale cost of $3.50 per item, and it is sold at a retail value of $5.00 per item. What is the gross profit percentage of the item? (formula: gross profit percentage = [(retail - cost) divided by retail] X 100 )

*June 15, 2011*

**Math**

An observer 2.5 miles from the launch pad of a space shuttle measures the angle of elevation to the base of the shuttle to be 25 degrees soon after lift off. How high is the shuttle at that instant? (Assume that the shuttle is still moving vertically)

*May 10, 2011*

**Math**

An observer 2.5 miles from the launch pad of a space shuttle measures the angle of elevation to the base of the shuttle to be 25 degrees soon after lift off. How high is the shuttle at that instant? (Assume that the shuttle is still moving vertically)

*May 10, 2011*

**Algebra**

thanks

*May 5, 2011*

**Algebra**

Use the function below to answer the following parts. 1/3x - 4 if -6 </= x < - 3 f(x) = 2 if -3 < x < 3 x^2 - 4 if x > 3 I found out the domain, range, and points of disontinuity. I think i did them right: Domain= [-6,infinity] Range= [-6,infinity] and points of...

*May 5, 2011*

**Algebra**

1/3x - 4 if -6 </= x < - 3 f(x) = 2 if -3 < x < 3 x^2 - 4 if x > 3

*May 5, 2011*

**Algebra**

Use the function below to answer the following parts. f(x) = 1/3x - 4 if -6 ¡Ü x < ¨C 3 2 if ¨C 3 < x < 3 x^2 ¨C 4 if x > 3 I know that: Domain= [-6,infinity] Range= [-6,infinity] and points of discontinuity = x=-3,x=3 How do i graph these ...

*May 5, 2011*

**math**

1875 if paid monthly

*April 27, 2011*

**math **

a restaurant offered pizza with 3 types of crust and 7 different toppings. how many different types of pizzas could be offered. 7 toppings on each i came up with 21 but not sure

*April 27, 2011*

**math**

with 7 toppings

*April 27, 2011*

**math**

a restaurant offered pizza with 3 types of crust and 7 different toppings. how many different types of pizzas could be offered?

*April 27, 2011*

**Maths**

Kindly predict the winning numbers from these past results 2 draws 79-64-62-89-8 & 5-52-14-27-22.

*April 12, 2011*

**math**

That Hairline

*March 28, 2011*

**math**

what is the nearest tenth of a centim eter in 4 inches

*March 13, 2011*

**physics**

m1v1=m1v1prime+m2v2prime

*March 13, 2011*

**SCIENCE**

WHAT IS PRESSURE EXERTED OUTWARDLY IN A CYCLINDER THAT HAS ONE END CLOSED AND THE OTHER OPEN WHEN AN INTERNAL HEAT SOURCE RAISES THE TEMPERATURE FROM 70 DEGREE F TO 300 DEGREE F IF THE CYCLINDER IS 48 INCHES DIAMETER AND 240 INCHES LONG

*March 10, 2011*

**Arithmetic**

the 16th term of an AP is 93,given that its common difference is 6.find the 28th term?

*February 27, 2011*

**science 4th grade**

How are the properties of the compound water different from the properties of the elements in it?

*February 8, 2011*

**math**

The question that have is to simplify and write the answer in exponential notation using positive exponents 2 to 4th power x 2 -2 These are my choices a 4 to the 8th power b 2 to the 8th power c 4 to the 2nd power d 2 to the 2nd power

*February 5, 2011*

**Chemistry--DR.BOB HELP!**

Ur the BEST DR.BOB!

*February 5, 2011*

**Chemistry--DR.BOB HELP!**

If 1 volume of 0.1 KH2PO4 is mixed with 2 volumes of 0.1 OHEtNH2 (pka=9.44), what will be the pH of the mixture? I know I know: HH equation

*February 5, 2011*

**biochemistry**

I believe you, correct if I'm not mistaken on part A. The answer is 7.50. for part B: the Base is the amount of initial base minus the amount of base protonated. Maybe Dr.Bob should show us Visually . DR.BOB!!!

*January 21, 2011*

**Organic chemistry**

Kabooga

*December 29, 2010*

**Math**

a person cleared a rectangular plot of land and covered it with gravel. then he got 9 square wooden sections of side lengths: 2,5,7,9,16,25,33 and 36. by placing the squares on the gravel with no two overlaping, the person built a patio which exactly covered the graveled ...

*December 16, 2010*

**organic chwmistry**

When bromobenzene reacts with propene in a Heck reaction, two constitutional isomers are obtained as a product. Give the structures of the two

*December 8, 2010*

**Physics**

An Olympic swimming pool is heated and maintained at 30 °C in the winter. It has a volume of 2500 m3, a length of 50 m, and a width of 25 m. During a storm, the pool receives 1 cm of rain over its surface area. If the rain is 15 °C, what will the temperature of the ...

*December 5, 2010*

**Physics**

A 1.00-kg beaker containing 2.0 kg of oil (density = 916 kg/m3) rests on a scale. A 2.00-kg block of iron is suspended from a spring scale and is completely submerged in the oil. Find the equilibrium readings of both scales. I was able to find the equilibrium reading for the ...

*December 3, 2010*

**Computer Programing & Logic Design**

.A program that accepts candy data continuously until a sentinel value is entered and displays a list of high-priced, best-selling items. High-priced items are those that sell for $10 per pound or more.

*November 20, 2010*

**Math**

1. Determine the vertex of the parabola: y= 7x^2+14x+6 2. For the following 2 functions,identify the horizontal and vertical asymptotes. a)f(x)= 3x(x-2)/x(x-1) b)g(x)= x/(x+7)^2

*October 31, 2010*

**college math**

the Laplace transform of e^4t(cos 2t)?? please i need help. thanks

*October 27, 2010*

**Cultural Anthropology**

one of the three food producing groups to explain if they are a more costly subsistence pattern in time, effort & calories as compared to the foraging groups.

*October 24, 2010*

**Math**

The Lappans buy 3 large sandwich wraps to serve at a picnic. 9 people in all will be at the picnic. Show 3 different ways to cut the sandwiches so that each person gets an equal share.

*October 18, 2010*

**Math**

3 neighbors are sharing a rectangular strip of land for a garden. They divide the land into 24 equal sized pieces. What fraction of the land does each person get if they share it equally? Write the answer in more than one way.

*October 18, 2010*

**Math**

The Lappans buy 3 large sandwich wraps to serve at a picnic. 9 people in all will be at the picnic. Show 3 different ways to cut the sandwiches so that each person gets an equal share.

*October 18, 2010*

**stats**

Microbes in a certain colony exposed to radiation have a 1/6 chance of being mutated. a. If ten microbes from the colony are sampled, what is the probability that exactly 4 will be mutated? b. If ten microbes from the colony are sampled, what is the probability that at most 4 ...

*October 16, 2010*