Monday

April 27, 2015

April 27, 2015

Total # Posts: 242

**Chemistry**

An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)
*April 19, 2015*

**Differential Calculus**

Hi pls help me i dunno what to do show me complete solution please please Thank you. a piece of wire 10ft. long is cut into two pieces , one piece is bent into the shape of a circle and the other into the shape of a square. How should the wire be cut so that: a.)The combined ...
*March 29, 2015*

**calculus**

A particle moves on a line so that its position at time t seconds is p(t)=3t3 meters to the right of the origin. Find the time c in the interval (4,8) for which the velocity of the particle at time c is equal to the average velocity on the interval [4,8].
*March 26, 2015*

**physics**

A mother rocket fired from the ground last year’s eve ejects 25% of its mass 2.0 at the at the rate if so m/s in the first second of its flight. Find the initial acceleration of the mother rocket.
*March 25, 2015*

**physics**

A mother rocket fired from the ground last year’s eve ejects 25% of its mass at the at the rate if so m/s in the first second of its flight. Find the initial acceleration of the mother rocket.
*March 25, 2015*

**physics 10**

1.) 100 kJ of heat is added to 600g of zinc at 20 C and 75g of it melts. If the specific heat of zinc is 0.385 kJ/kg-C and it melts at 420 C. What is its heat of fusion? 2.) If all the heat lost by 1kg of water at 0 C when it turns into ice at 0 C could be burn into KE, What ...
*March 15, 2015*

**Stats**

The waiting times between a subway to Podger schedule and the arrival of the passenger on uniformly distributed between zero and nine minutes find the probability that a randomly selected passenger has been waiting greater than 3.25 minutes
*March 11, 2015*

**physics**

skater has a mass of 45 kg and is at rest. skater 2 has a mass of 50 kg and is moving along at a constant velocity of 3.2 m/s East. skater 3 has a mass of 75 kg and is moving quickly at a constant velocity of 9.6 m/s East. which state experiences the greatest force?
*March 7, 2015*

**Math/algebra**

thank u Steve soo much
*February 20, 2015*

**Math/algebra**

Ms. sue i don't know that is what im trying to find out
*February 20, 2015*

**Math/algebra**

i'm dividing 52 glass bears into groups she has 1 left over how many groups thanks ella
*February 20, 2015*

**mathematics**

From an airplane at an altitude of 1200, the angle of depression to a rock on the ground measure 28 degrees find the horizontal distance from the plane to the rock?
*February 9, 2015*

**Science**

Identify and discuss at least two forces that would be involved when an elderly patient who is proped up at about 4 degrees in a bed and slowly slides down to an almost horizontal position?
*January 24, 2015*

**physics**

gain, not again
*December 8, 2014*

**physics**

Assuming 100% transfer of energy in the system, please calculate maximum KE (Kinetic Energy) that the rocket has if the rocket were to again a height of 25 meters. Rocket mass = 0.5 kilograms, and gravity = 9.8 m/s^2
*December 8, 2014*

**Math**

No the cook doesn't have enough flour. You first need to find a common denominator of twelve. So you are 1/12 a cup of flour short.
*December 8, 2014*

**Honors Chem**

If I make an ice pack with 750 mL of water, what mass of ammonium chloride must I include to get the temperature to drop from 20 degrees celsius to 5 degrees celsius. The heat of solution of the water and ammonium chloride is 14.8 kJ/mole. I just need help setting this problem...
*December 2, 2014*

**CHEMISTRY HELP**

how can analytical chemistry help on different fields of sciences and technology?
*November 26, 2014*

**English**

Birches by Robert Frost When I see birches bend to left and right Across the lines of straighter darker trees, I like to think some boy's been swinging them. But swinging doesn't bend them down to stay As ice-storms do. Often you must have seen them Loaded with ice a ...
*November 19, 2014*

**ap biology**

The best conclusion concerning delta is that the cells a. contain no DNA. b. contain no RNA. c. contain only one chromosome that is very short d. are actually in the G0 phase e. divide in the G1phase Explain your choice: Would it be d?
*November 19, 2014*

**math**

GCD (24,20) IS 4. sINCE gcd(4,12 ) is 4 then GCD (24,2012 IS 4 USE Euclidem LGERITHM TO FIND THE gcd 722, 2413,209
*November 18, 2014*

**English**

Here is another poem that uses personification to help define the theme. Answer the questions that follow using all you know about poetic devices. The heart asks pleasure first, And then, excuse from pain; And then, those little anodynes (a medicine that relieves pain) That ...
*November 18, 2014*

**English**

Act I of An Enemy of the People Question Think carefully about what each quote might infer about the character and choose the most appropriate answer in the context of the play. Taking one thing with another, there is an excellent spirit of toleration in the town--an admirable...
*November 17, 2014*

**MATH**

write the following square root in the form a over sq root b, where a and b are intergers and b has the least value possible root 63 =
*November 14, 2014*

**Math**

thank you Jeff(:
*November 13, 2014*

**Math**

What is the order of the numbers from least to greatest? 2.01, 2.1, 2.001, 2.11, 2.011
*November 13, 2014*

**History Help Please?**

I mean when your about to reply to this, look under it at Related Questions.
*November 13, 2014*

**History**

Hey, if you look under this at related questions.. People asked the same thing and it has answers(:
*November 13, 2014*

**math**

Bert is 5 years older than twice the age of mario. Nine years ago, the sum of their ages is 50. How old is each now?
*November 7, 2014*

**Please Check Answers for Health**

Please check my answers because I need to do good at this. 1. When consuming fats the healthiest choice is foods high in? A. saturated fats B. unsaturated fats * C. trans fat D. cholesterol 2. The body's main energy source should come from what essential nutrient? A. ...
*November 6, 2014*

**physics**

find the mass of a ball on a roof 30 meters high, if the ball's gravitational energy is 58.8 joules.
*November 3, 2014*

**Algebra word problem**

A parabolic arch has a height of 20 m and a width of 36 m at the base. If the vertex of the parabola is at the top of the arch, at which height above the base is it 18 m wide?
*October 11, 2014*

**physics help please**

An airplane has an air speed of 112m/s [N 20 degrees W] and has a ground speed of 106 m/s [N 25 degrees W]. Find the velocity of the wind.
*September 28, 2014*

**Physics help please **

A student swims at 4m/s. She is swimming from west to east across a river that's is flowing 2.2m/s [S]. A) if the river is 100 m wide, what is the quickest time that she can swim the entire width? B) how far downstream will she be? C) if she decides to go directly across ...
*September 28, 2014*

**Physics Please help**

quiz tomorrow on these type of questions I need help!!!!
*September 28, 2014*

**Physics**

A student swims at 4m/s. She is swimming from west to east across a river that's is flowing 2.2m/s [S]. A) if the river is 100 m wide, what is the quickest time that she can swim the entire width? B) how far downstream will she be? C) if she decides to go directly across ...
*September 28, 2014*

**Help with physivs**

Please help a quiz tomorrow on this stuff I need help!!!
*September 28, 2014*

**physics**

An airplane has an air speed of 112m/s [N 20 degrees W] and has a ground speed of 106 m/s [N 25 degrees W]. Find the velocity of the wind.
*September 28, 2014*

**physics**

A car is moving with a velocity od 10.1m/s [N] while on a ferry that is moving across a lake.if an observer on shore measures the velocity of the car to be 29m/s [N] how quickly is the ferry moving?
*September 28, 2014*

**Physics**

A car is moving with a velocity of 10.1m/s [N] while on a ferry that is moving across a lake. If an observer on a shore measures the velocity of the car to be 29.0m/s [N] how quickly is the ferry moving?
*September 24, 2014*

**geography**

this occurs when cooler air cannot retain all its vapor
*September 1, 2014*

**geography**

This process distributes the heat from the sun around the earth?
*September 1, 2014*

**geography**

This reflects some heat back into space and traps some heat near the earth.
*September 1, 2014*

**conducting expiriments**

conduct the expiriment and record your results mean?
*May 29, 2014*

**science**

What can be done to prevent mine drainage from damaging the ecosystem
*May 5, 2014*

**POL201**

Fredick Winslow Tylor was concern with all but the following a. making workers feel appreciated b. making 1st class worker out of 2ne class worker c. efficiency d. good management
*April 28, 2014*

**AP Chemistry**

1,2-Benzanthracene is a yellow-brown nonvolatile solid with molecular weight 228.29g*mol-1. an 18.2632-g sample of 1,2-benzanthracene is dissolved in 250.0 g of benzene, C6H6. Whta is the vapor pressure of this solution at 25C, in millimeters of mergury, if the vapor pressure ...
*March 10, 2014*

**spanish**

?Le gusta tocar la guitarra a la maestra?
*February 18, 2014*

**Health/Writing**

Alright, thanks a bunch :)
*February 15, 2014*

**Health/Writing**

the story talks about his struggle from cancer. the removing cancer will come in the middle of the story. first i want to show how he ended up with it.
*February 15, 2014*

**Health/Writing**

So I'm writing a story about a guy who gets brain tumor because of a car accident. I know it may be a stupid question, but how can someone retrieve tumor in such a situation? Or where can radiation, enough to give cancer, be found. Maybe a place or a truck or something ...
*February 15, 2014*

**Algebra**

The answer is C, I looked at his answer and all that is different is he multiplied the equation in the parentheses by 2!!!
*February 13, 2014*

**Chemistry**

Alcoholic drinks contain ethanol. 10cm3 of ethanol is called one unit of alcohol. Men are advised to drink a maximum of 21 units of ethanol a week, while women are advised to drink a maximum of 14 units. Wine contains about 14% ethanol by volume. A) a bottle of wine contains ...
*February 8, 2014*

**Wriitng**

thank you guys!
*December 30, 2013*

**Wriitng**

What would be the reaction of a teenage daughter after rescuing her parents after their kidnap? so this is for a story I'm writing. basically, my main character finds her parents and is finally there after a lot of hard work and struggle. she's seen a lot of things she...
*December 30, 2013*

**Writing**

Thank you!!
*December 20, 2013*

**Writing**

what would be another way to phrase "i'm on a rollercoaster that only goes up". like is there another metaphorical or symbolic sentence like it which we can say. just to erase some confusion--i'm talking about using other words that portray the same meaning. ...
*December 20, 2013*

**English**

I am in 2nd grade.I no what your talking about.
*December 18, 2013*

**Geometry**

Imagine a piece of square paper that measures 20 by 20 cm. You can make a box (with no lid) by cutting a square of the same size from each corner and folding up what's left to make a box. Keeping the lengths of each sides integers, what is the maximum volume box that can ...
*December 5, 2013*

**Chemistry**

If a student used an iron scoopula, instead of a plastic one, to add the unknown metal to the HCl solution, will it affect the calculated molar mass of the unknown metal? If so, how? Justify your answer with an explanation.
*September 23, 2013*

**Chemistry**

Can calcium hydroxide solution be used to distinguish Co(NO3)2 and Fe(NO3)3 solutions using only the titration technique? Justify your answer with an explanation.
*September 23, 2013*

**math**

Thank you.
*September 16, 2013*

**math**

George wants to build a square fence using 80 meters of wire. What is the area of the fence if you use all of the wire equally among each side?
*September 16, 2013*

**Algebra I**

The sum of two numbers is 15. Three times one of the numbers is 11 less than five times the other. Find the numbers. Please help. ^.^
*September 9, 2013*

**Algebra I**

Find a number that is 96 greater than its opposite.
*September 9, 2013*

**algebra**

determine the equation of the line through the points (8,2) and (-4,-1) Please explain and show work
*May 23, 2013*

**Trigonometry**

Given that sin alpha = 15/17 and -360 <alpha<360 find all values of alpha to two decimal places. Help Please!
*May 18, 2013*

**HISTORY**

Good point. Thank You.
*May 14, 2013*

**HISTORY**

Necessary for all the countries that took part. Like America, Germany, Great Britain
*May 14, 2013*

**HISTORY**

Was imperialism necessary in the 19th century?
*May 14, 2013*

**Math **

Factorise fully: 5pq + 10p
*April 9, 2013*

**median and mode**

What is the median of this set of numbers 85,48,75,36,55
*April 4, 2013*

**physics**

A student throws two beanbags in the air, one straight up and the other one at a 30° angle from the vertical. Both beanbags are thrown with the same initial velocity and from the same height. In your own words, explain which one will come back and hit the ground first and ...
*March 11, 2013*

**Poetry??**

Read the following excerpt from “and sometimes i hear this song in my head.” "and our tongues keep remembering the rhythm of the words we forgot swaying on the backs of buses and in hot kitchens crooning in pool halls and shared bathrooms yeah/we carving a ...
*March 5, 2013*

**Physical Science Help!**

Can someone please help me balance these equations? Thank you for your time!! 1. NO + O2 ¨ NO2 2. NH4Cl + Ca(OH)2 ¨ CaCl2 + NH3 + H2O
*February 11, 2013*

**Please help with Physical Science 2!! Confused!**

Complete the following table by replacing question marks with the correct numbers: (Note: Each horizontal row is a separate example, so in row #1, 175.32 grams of NaCl is how many moles of NaCl and how many molecules of NaCl does it contain?) Grams NaCl Moles NaCl # Molecules ...
*February 5, 2013*

**Economics**

Which of the following is a characteristic of a traditional economy? A. It encourages innovation and change. B. It is usually based on light industrial production. C. It has a high standard of living. D. It revolves around the family unit.
*December 6, 2012*

**university physics**

Derive absolute error in equations: 1)Derive absolute error in (e/m) e/m= 2V/B^2*R^2 2)Derive absolute error in B B=8uN(Inet)/square root 125a
*November 21, 2012*

**university physics**

A platinum resistance thermometer has resistances of 200.0 ohms when placed in a 0 degrees Celsius ice bath and 253.8 ohms when immersed in a crucible contacting melting potassium. What is the melting point of potassium? Hint: First determine the resistance of the platinum ...
*November 20, 2012*

**science**

dome
*November 19, 2012*

**physics, help! urgent!**

A positive point charge q = +2.50 nC is located at x = 1.20 m and a negative charge of ƒ{2q = ƒ{5.00 nC is located at the origin. (a) Sketch the electric potential verses x for points on the x-axis in the range -1.50 m < x < 1.50 m. (b) Find a symbolic ...
*November 14, 2012*

**physics, help!!**

A metallic sphere initially has a net charge of +4.0 nC. A negatively-charged rod initially has a net charge of –6.0 nC. When the rod touches the sphere 8.2 x109 electrons are transferred to the sphere. What is the new net charge on the sphere?
*November 9, 2012*

**physics**

Three point charges, A=2.00 uC, B=7.00 uC, C=-4.00 uC, are located at the corners of an equilateral triangle. a) Find the magnitude and direction of the electric field position of the 2.00 uC charge. b) How would the eletric field be affected if the charge there were doubled. ...
*November 7, 2012*

**english 11**

example of situation irony in act iii of the crucible
*October 19, 2012*

**algebra**

f the principal P = $500, the interest I = $250, and the rate r = 10%, find the following. (a) What is the time?
*September 3, 2012*

**geography**

I'm pretty sure it's China.
*August 21, 2012*

**Medical termanology**

Give me a example of how to write the report.
*August 19, 2012*

**Medical termanology**

Write a fictitious medical report of about two paragraphs describing a dermatologic condition or disease. Focus the report on the onset,progression,location,and etiology of the condition or disease and the treatment parameters.
*August 19, 2012*

**algebra**

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results are below. 36 said they drove alone. 31 rode in a carpool. 32 rode public transportation. 6 used both carpools and public transportation. 7 used both a carpool and sometimes ...
*August 11, 2012*

**6th Grade Math: Proportions**

Hi! The answer is 10.68 when you round to the nearest hundredth but I'm not sure what the exact answer is. I hope this helps.
*August 8, 2012*

**Math**

out of these variables which would and would not follow normal distribution. shoe size height age GPA model year of car how many friends on face book Please explain why..thanks
*June 9, 2012*

**track and field**

lkggujjhvyjjmhmjhvhjcv
*May 12, 2012*

**math**

Write and solve the differential equation that models the verbal statement. Using k for the constant of proportionality The rate of change of N with respect to s is proportional to 626 − s. dN/ds= N=
*April 30, 2012*

**government**

According to the doctrine of judicial restraint, the judiciary should?
*April 25, 2012*

**Alegbra**

I am trying to factor, but I can't seem to get this one. The question is: -15d*2*-2d+8. It is actually -15d squared but I didn't know how to right that without it being confusing. Anyways I changed it so now it says -1(15d-2d+8). Then I drew a diagram using the factors...
*April 24, 2012*

**Chemistry**

What will be the effect on a chromatogram of two well separated peaks if: (this is for a gas chromatography) a) the carrier gas flow is set too high? b) the temperature of the injection port is set too low? c) the temperature of the column is set too high?
*April 3, 2012*

**Chemistry**

If the gas chromatograph is polar, and a mixture of a polar compound and a non-polar compound is injected. Which one of the two compounds will have a higher retention time? Why?
*April 3, 2012*

**chemistry**

What will be the effect on a chromatogram of two well separated peaks if: (this is for a gas chromatography) a) the carrier gas flow is set too high? b) the temperature of the injection port is set too low? c) the temperature of the column is set too high?
*April 3, 2012*

**Geography **

Can someone check these for me? 1.What problem has been at the heart of the intense political struggles in Central America? Unequal distribution of usable land is the heart of the political struggle. There is a shortage of farmland in order to meet the needs of everyone. ...
*March 23, 2012*