# Posts by Mike

Total # Posts: 3,736

**chemistry**

The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. A Be3+ ion with an electron in the n= 3.00 level emitted a photon with a frequency of 7.30 × 1015 Hz. What is the value of the level n for the new energy?

**chemistry**

yeah sorry hehe thanks!

**chemistry**

so it would be 0.96 ?is that right? (8x-393.5)+9(-241.8)+x=5113.3 -5324.2+x=5113.3 x=0.96

**chemistry**

For a particular isomer of C8H18, the following reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2(O2)(g) -> 8CO2(g) + 9H2O(g) DeltaH= -5113.3 kJ What is the standard enthalpy of formation of this isomer of C8H18(g)?

**Center**

How is the efficiency of pushing a concrete block up a wooden ramp increased

**Science**

Job Issues related to overdrawing surface water?

**prealgebra**

Two consective number of square root of 3

**math**

A rectangular parking lot is to be constructed on land bordered on one side by an alley. There is 360 ft of fencing to use along the other three sides. What should be the dimensions of the lot if the enclosed area is to be maximum?

**Physics**

What is the magnitude of the electric field at a point midway between a -5.1 microC and a +6.1 microC charge 10cm apart? Assume no other charges are nearby. What is the direction of the electric field?

**Problem Solving: Make a Table**

725

**Physics**

87

**Social studies**

To write a paragraph explaining Lincoln's vision of the united states. Make at least 2 references to specific details of the Gettysburg address.

**math**

How do u find the area of a shape size 7 1/4 square

**pre-algerbra**

A farmer is building a square pen 21 feet on each side. He puts one post at each corner and one post every three feet in between. how many posts will he use. please give equation

**Physics**

A person lifts a 5.2 kg cement block a vertical distance 1.2 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.

**pre calculus**

how to figure out: sec squared x = 1/10

**Rational Zeros**

DERRRR

**trigonometry**

find v +u if vector =<6,8>and vector for u + <2,1>

**math**

i don't know how to calculate

**math**

James travels 624 miles in 8 hours ona train at a constant rate of speed. How many miles does he travel in 3 hours?

**Physics**

The scale in Fig. P12 is being pulled on via three ropes. (The force on each rope is F = 180 N.) What net force does the scale read? F 30 Degrees

**Physics**

The two ropes attached to the hook in the figure below are pulled on with forces of F1 = 150 N and F2 = 300 N. What size single force acting in what direction would produce the same effect? F1 45 Degrees F2 30 Degrees

**algebra**

use the graph of the function f to find f(-4), f(-3), and f(-2)

**math**

Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...

**mth**

A popular new secretary at the law firm of Farnsworth, Newman, O’Malley, Price, and Reynolds, is taken to lunch by a different one of those five men on each of her first week on the job. Each man took her to eat at a different one of these five types of food: Chinese, ...

**Math**

Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...

**MATH**

Cereal can be good source of protein.how many quarters cups of cereal are there in 6 1/4

**Geomtry**

Five fences meet at a point to form angles with measures x, 2x, 3x, 4x, and 5x around the point. Find the measure of each angle.

**world history**

What helped unite Charlemagne's empire? answer A strong efficient government helped unite Charlemangne's empire

**world history**

what helped unite charlemagne's empire? Viking attacks

**US History**

What goes in the first box?

**calculus**

given f(x)=sqrt(x). find the distance of the point P(2,5) from the line tangent to the functions at x=4.

**world history**

Who won the battle between the English and the Welsh ? the English right?

**calculus**

given f(x)=ã(x). find the distance of the point P(2,5) from the line tangent to the functions at x=4.

**Physics**

Thank you again DRWLS but ref my post "site not working correctly". Still cannot read the answer. Most frustrating. Can I close the adverts? Mike

**Physics**

I understand there is a relationship between pressure & temperature in a sealed rigid container. An open container is placed in a freezer at -15 degrees C then the door is opened and the cap replaced with the freezer at 1000mb what will the pressure be within the container if ...

**Site not working correctly/Physics**

I posted a question a couple of days ago which was answered by DRWLS - thank you. Unfortunately I am unable to read the guidance provided as the typing is obscured by the adverts down the right hand side of the page. Look forward to replies. Thanks Mike

**Business comunication**

Answer: is statement random or discreet? a. Temperature of the coffee served to a randomly chosen customer.

**algebra**

what is two different word phrases for the expression t-30

**Physics**

Thanks drwls but I cannot read your answer due to adverts on the site covering your typing. Mike

**Physics**

I understand there is a relationship between temperature & pressure. If a rigid open container was placed in a freezer at -15 degrees C. Removed and its airtight cover replaced simultaneously at 1000mb. What would the pressure be within the container if it was kept in a room ...

**Physics**

The internal energy of a gas is 900 J. The gas is compressed adiabatically, and its volume decreases by 100 cm3. If the pressure applied on the gas during compression is 1 atm, what is the internal energy of the gas after the adiabatic compression? The answer is 890 J, but I ...

**HTML**

How do I change the color of the button after a button is pressed in html.

**calculus**

An object moves in such a manner that its velocity at time t is given by v(t) = t3 - 4t2 +3t At t = 0, it starts at position x = 0. During the interval [0, 4] what is the absolute distance moved?

**arithmetic**

the sum of the first 8 term of an arithmetic progresion is 220,if the third term is 17.Find the sum of the first 6 items

**math**

sam chovell is a private detective working in the Bay area. One month he helped the police to solve five mysteries

**Math help please**

Explain how to find the value of Y in the following expression 5 Y.6=29

**Math**

You own a small winery that produces two types of Chardonnay, an extra extra oaky one and an oaky one. The wines are produced from the same grapes. Furthermore, both wines are aged in oak barrels, and have additional oak chips added into the oak barrels. However, the extra ...

**Math**

How does a tally chart help you to display data?

**Geometry**

can you tell us in the diagram which is x and which is y please

**Math**

i am building a rectangular table top. the perimeter is 22 ft. the area is 24feet squared. what are the dimensions of the tabletop

**science**

Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...

**physics**

A block of mass m sliding on a frictionless table is attached to a string that passes through a narrow hole through the center of the table. The block is sliding with speed v0 in a circle of radius r0. (Use any variable or symbol stated above as necessary.) Find angular ...

**Statistics**

A battery manufacturer is positive that its AA batteries last for 1,000 hours. However, you’re working for Consumer Reports and you don’t agree with what they say about their product. So, you buy 400 batteries and you test them out. Your findings are that the ...

**statistics**

2)A political candidate is positive that she will get 60% of the vote in an upcoming election. A sample of 100 people is taken, and 52 say that they will they will vote for her. Using a 5% significance level, is the politician right in her claim?

**psy.**

Equal Status

**Math**

How many faces, vertices, edges does cone have?

**i.p.c**

An ostrich runs north in a straight line for 21 meters. She then turns around and runs 25 meters back toward her nest (south) on the same path. What is her displacement?

**world history**

can you please check my answers 3.In China in the 1980s, commune-based agriculture was replaced by the _______ responsibility system. A. household B. community C. cultural<< D. Confucian _______________________________________ 4. Which of the following statements about ...

**CHEMISTRY (HELP!!! PLEASE)**

CH3CH2CH2CH( a c on top of the ch and a triple bond on top of the c)CH2CH2CH2CH3

**Chemistry**

CH3CH2CH2CH( a c on top of the ch and a triple bond on top of the c)CH2CH2CH2CH3

**Math**

Lisa studies for 7 hours for a particular test and got a score of 71, how many hours would she have had to study to get a score of 91?

**CHEMISTRY**

CH3CH2CH2CH( a c on top of the ch and a triple bond on top of the c)CH2CH2CH2CH3

**CHEMISTRY**

correction ch3-ch2-ch2-ch(c triple bond CH)-CH2-CH2-CH2-CH3

**CHEMISTRY**

name this alkyne ch3-ch2-ch2-ch3(cßCH)-CH2-CH2-CH2-CH3 is a heptyne but i just cant figure out the name . Ive tried 1-heptyne but its not the right answer :S help?

**world history**

What were the 5 major Greek city-states ? Sparta,Athens, Corinth,Argos,Megara Right?

**history**

1)Who persecuted the Christians first ? -Jews. 2) Who did the Christians persecute? can you help me answer number 2 Thank you

**history**

What war directly led to the Athenian golden age under the rule of Pericles ? Persian war

**3rd grade math**

I think Ms.Sue is correct, 2 owners, 3 pets each.

**history**

Who began a savage campaign to overthrow Europe? julius caesar

**history**

whom did Rome face attacks from ? Germanic people , Carthage . is my answer right?

**history**

whom did Rome face attacks from ? answer Macedonia, Greece and part of Asia all of them what do you think ?

**history**

I will say all

**history**

whom did Rome face attacks from ? answer Macedonia, Greece and part of Asia

**history**

who did rome destroy and then put salt over the land so nothing would grow again? answer: Carthage

**math**

How many cubic yards of concrete will it take to fill a cylindrical column that is 24 feet high and whose diameter is 2 feet

**Calculus**

S=6x^2 is the surface area of a cube. Find the exact change in surface area when x is increased from 6 cm to 6.1 cm . Please Help. It makes no sense.

**MATH**

HOW DO I FIND THE PRODUCT OF 11/15 AND 12/7

**chemistry**

A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac the methyl red endpoint...

**Chemistry**

A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac the methyl red endpoint...

**Maths - Algebra**

Boxes are made by cutting 8cm squares from the corners of sheets of cardboard and then folding. The sheets of cardboard are 6cm lnbger than they are wide. width of sheet= x length of sheet = x+6 length of finished box = (x-10) width of finished box = (x-16) volume of the box...

**chemistry**

What are emission spectra? Is it correct to say . The pattern of spectral emission lines produced by an element.Each element has his own unique emission spectrum. What do you think?

**chemistry**

Is it correct to say . The pattern of spectral emission lines produced by an element.Each element has his own unique emission spectrum. What do you think?

**chemistry**

What are emission spectra?

**Math**

For each of the following draw a Venn diagram for sets A, B, and C that satisfies the given conditions: a.Draw a Venn diagram for sets A, B, and C such that b.Draw a Venn diagram for sets A, B, and C such that

**Javascript**

I need help these javascript exericses: Input: A text string, using prompt. Output: Either "Valid name" or "Invalid name", depending on whether the input names fit the required format, which is Last name,first name, middle initial where neither of the names...

**Math**

Main Street can hold four houses. About how big would one house be?

**Science-Please help**

Can someone tell me what this question means I don't understand it: Violent weather - thunderstorm- Why must Charge Separation be tremendous prior too the occurrence of lightning?

**physics**

When catching a baseball, a catcher's glove moves by 12 cm along the line of motion of the ball. If the baseball exerts a force of 463 N on the glove, how much work is done by the ball?

**nutriction and wellness**

Using the Dietary Guidelines for Americans, 2005 (particularly chapters 5 through 8) as a reference, evaluate the 3 web-based nutrition sites listed below. Explain why you think the information is accurate or not. Three web-based sites to evaluate: Good Food Choices ...

**literacy**

what was the fedstats found in virtual ref room

**Math**

Stacy requires $3,000 in three years to make a down payment on a new car. She will receive 8% compounded annually for the three years. How much must she invest today to have the $3,000 in three years? (a) $ 2,381.49 (b) $ 2,419.35 (c) $ 2,000.00 (d) $ 2,500.00 (e) $ 2,250.00

**math ( algebra 2 )**

a newspaper company currently charges $11 a week to its subscribers, but is considering raising their price. the company found that the weekly revenue y can be modeled by the function y= -750(x-40)(x+20) where x is the number $.50 increases in the weekly price. a. explain how ...

**math ( algebra 2 )**

a newspaper company currently charges $11 a week to its subscribers, but is considering raising their price. the company found that the weekly revenue y can be modeled by the function y= -750(x-40)(x+20) where x is the number $.50 increases in the weekly price. a. explain how ...

**spanish**

How do you day, Tell Vicente to come back next Tuesday in Spanish?

**math**

4x-8=28. find x

**CSS/ Web programming**

Test the following CSS code: <style type = "text/css"> p.standout{font-size: 24pt; color:blue;background-color:red}; </style> <p class = "standout"> To really make it stand out, use a red background </p> What background color do you ...

**human resources**

which of the following terms describes the formal process to identify and document a workers contribution and workplace behavior a)performance appraisal b) performance factor c) performance incentive d) performnace limitation

**math**

each student will create an adding, subtracting, multiplying, or dividing expression containing square roots.you will simplify the expression and display it step by step. There can be no use of perfect squares in the original expression.

**MRU**

suppose a population of nursing students heights is normally distributed with a population mean of 166 cm and a population stanadr deviation of 7.5cm if a female is randomly selected from this population, what is the probability that she will have a height between 155 and 175 ...