Sunday

April 19, 2015

April 19, 2015

Number of results: 22,254

**Physics**

Which one of the following frequency can set the string into resonant vibration? If a guitar string has a fundamental frequency of 500Hz. a)250Hz b)750Hz c)1500Hz d)1750Hz
*December 6, 2009 by Satej*

**8th grade**

need help thank-you translate the verbal phrase into an inequality, then solve the inequality and graph your solution, the product of 6 and the difference of 6x and 3 is less than or equal to the product of -2 and the sum of 4 and 8x
*December 7, 2009 by Zach*

**math**

the boys of a school can be arranged in 12,15 and 18 equal rows and also into a solid a square.what is the leat number of boys that the school can have ? (hint find the lcm)
*December 19, 2009 by furqan*

**Chemistry**

This is the equation for the formation of Al(OH)3: 6NaOH (aq) + Al2(SO4)3 (aq) ¨ 2Al(OH)3 (s) + 3Na2SO4 (aq) Would any side products be formed if NaOH was added quickly into Al2(SO4)3?
*March 22, 2010 by Alan*

**College Admission**

I am currently outside USA. Now in Asia we follow the Cambridge igcse curriculum. If I move to USA can I still get into an Ivy League college?
*March 27, 2010 by Amir*

**physics**

You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. Determine the frequency, period, and speed of these water waves.
*May 30, 2010 by Dominique*

**physics**

A(n) 3.46 g bullet is fired into a(n) 2.4 kg ballistic pendulum and becomes embedded in it. The acceleration of gravity is 9.8 m/s2 . If the pendulum rises a vertical distance of 7.13 cm, calculate the initial speed of the bullet.
*October 27, 2010 by Jonathan*

**chemistry**

If you had walked into the lab, only to discover that you only had 0.1 M sulfuric acid available to run your tests, how might this have affected your calculations? Why?
*December 30, 2010 by NELL*

**business application**

Explain why it is essential to learn about computers today and discuss several ways computers are integrated into our business and personal lives.
*January 3, 2011 by porshe*

**optimization**

A model space shuttle is propelled into the air and is described by the equation y= (-x2/2e) +ex (in 1000 ft), where y is its height in feet above the ground. What is the maximum height that the shuttle reaches?
*January 13, 2011 by james*

**Physics**

A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?
*January 13, 2011 by Dani*

**Physics**

A 14,245N auto with a velocity of 6.0m/s crashes into a brick wall. If the car moves 64.0 cm before coming to a stop, what average force does the car exert on the wall?
*January 13, 2011 by Dani*

**Calculus Optimization**

A model space shuttle is propelled into the air and is described by the equation y=-x^2/2e + ex (in 1000 ft), where y is its height above the ground. What is the maximum height that the shuttle reaches?
*January 18, 2011 by jennifer*

**Math(Please check)**

Find the slope of the graph at y=sqrt 2x^2 +1 at the point (2,3). First I plugged 2 into the equation and got 3. Then the derivative of the equation is 4x and then I multiplied that by 3 and got 12. Is this correct?
*February 5, 2011 by Hannah*

**Physics help please!**

A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0230 m deeper into the water. What is the weight of the rock?
*June 15, 2012 by Sammy*

**Chemistry**

A 34.6 g block of metal at 2.1oC is dropped into 100.0 g of water at 97.3oC. If the specific heat of the metal is 0.084 cal/goC, what will the final temperature of the water be?
*April 24, 2011 by Kat*

**chemistry **

A unknown piece of metal is placed into a container of acid. Hydrogen gas was produced as a result. The unknown metal could have been ? Ti is the answer, but I don't understand why.
*May 22, 2011 by jazmin *

**Psychology**

In this memory process, the individual records information to prepare it to be entered into memory. Storage Encoding Retrieval Priming i think the answer is encoding but then im confused?
*June 9, 2011 by Jesse*

**math**

Meg has a piece of poster board that is two and two-fifths feet wide. She needs to fold it into three equal sections. How wide will each section be?
*August 2, 2011 by Anonymous*

**English**

I think I used "punch" incorrectly. 1) What do you call the machine into which you insert your train ticket and you get the date and time stamped on it (??). Before you go on the train, you have to ..... your ticket.
*October 3, 2011 by Henry2*

**NYU **

NYU(New York University)? Is it tough to get into? like I want to become an artist and a writer so what addmission and grades (SAT, GPA, AND GRADES), school clubs ???? THANK U
*October 21, 2011 by Laruen *

**chemistry**

A pressure of 25.7 inHg would be how many kilopascals? I received an answer but the person who helped me used mmHg. How do I convert inHg into mmHg to solve my questions. Help please
*November 24, 2011 by Sandy*

**geometry**

A person deposits $500.00 into a savings account and pays 5% annual interest that is compounded yearly. At the end of the 10 years how much money will be in the savings account ?
*December 5, 2011 by Anonymous*

**Physic**

The moon orbits the earth a a speed of 1.02 Kilometers per second. Use dimensional analysis to convert this speed into miles per hour. is the answer .28 m/s????
*January 14, 2012 by Susie*

**Chemistry**

At a particular temperature, K = 2.0 10-6 mol/L for the following reaction. 2 CO2(g) 2 CO(g) + O2(g) If 1.8 mol CO2 is initially placed into a 5.9-L vessel, calculate the equilibrium concentrations of all species.
*February 20, 2012 by Elizabeth*

**Physics**

A reversible engine converts 1/6 of the heat input into work. When the temperature of the sink is reduced by 62C, the efficiency of the engine is doubled.What are the temperarure of the source and sink?
*April 19, 2012 by Tulika*

**math**

he boys of a school can be arranged in 12,15 and 18 equal rows and also into a solid square. what is the least number of boys that the school can have?(Hint: find LCM)
*May 15, 2012 by aliya*

**History**

During the Oka Crisis, the Mohawk later surrendered, but the plan for the town of oka to create the land into a golf course was cancelled. Did the Mohawks get to keep their land?
*July 16, 2012 by Vanessa*

**Physics**

A bullet with the mass of 45 g is fired into an 8.3 kg block of wood resting on a floor against a spring. This ideal spring (k = 76 N/m) has a maximum compression of 28 cm. What was the initial speed of the bullet?
*July 17, 2012 by KnowsNothing*

**Math**

A 51 meter rope is cut into 2 pieces so that one piece is 6 meters longer than four times the shorter piece. Find the lengths of both pieces.
*September 19, 2012 by Kimberli*

**Math**

Mark has a 40 foot length of rope he decides tocut it into two pieces. He wants one length four times as long as the other. How long is each piece?
*October 9, 2012 by Anonymous*

**Chem- Percent Yield**

When HgO is heated, it decomposes into elemental mercury and diatomic oxygen gas. If 42.9 g of Hg is obtained from 70.1 g of the mercuric oxide, what is the percent yield of the reaction?
*October 11, 2012 by Lara*

**Sociology**

This unit we learned about the various social statuses in the U.S. Identify and describe each status. How are they similar and how do they differ? Into which social status do you fit and why do you feel this way
*November 9, 2012 by Mary*

**Math**

Don breaks a4 by 7array into a 2 by 7 array and another array. What is the fact for dons second array? Write a.number sentence that models the relationship of the 4 by 7 array to the other two arrays
*January 2, 2013 by Kolby knapp*

**Algebra 1**

So as I was doing me hw, I ran into this question, and I cant figure it out... Anyone wanna try? 7. The ratio of the perimeters of two triangles is 2:5. The perimeter of the larger triangle is 20 cm. What is the perimeter of the smaller triangle?
*January 11, 2013 by Miranda*

**Math**

Sandra used a triangular prism 10 cm long to refract light into the spectrum. Each triangular end had an area of 3.5 cm squared and sides 3 cm, 3 cm and 2.6 cm. What was the surface of the prism?
*February 7, 2013 by Monica*

**Math**

A man is cutting a board that is 6 3/4 ft into pieces that are 8 inches each.He will make as many as 8 inch boards as he can.How much wood will be remaining from the original piece when the man finishes cutting?
*April 10, 2013 by Praphul*

**chem (boyles and charles law)**

A 1.00L balloon is filled with helium at 1.20 atm.If the balloon is sqeezed into a 0.500L beaker and doesnt burst ,what is the pressure of the helium?
*April 28, 2013 by ty*

**Mathematics **

A toy projectile drives 12 meters, stops, and is stationary before launching 34 meters into the sky. At what angle, with respect to its starting point, is the toy located?
*May 19, 2013 by Anonymous*

**maths**

A ship is sailing due east at 18 knots runs into a 3 knot current moving 40 East of North. The resultant speed an direction of the ship are:
*June 20, 2013 by k*

**Physics**

200 g of ic is at -5C is dropped into a container containing water at 65C. If the final temperature of the mixture reaches 21C, what mass of water must be present in the container?
*July 22, 2013 by Todd*

**spelling words**

Hello my name is Travon I need help on making my spelling words into two sendence liks See the green frog. He is sitting on the log
*November 12, 2013 by Travon*

**Physics**

A container contains 15 liters af water at 96 celsius. A 1 kg of ice cube at -20 celsius is dropped into the water. No heat is lost to the surroundings. What will the final mixing temperature be?
*February 17, 2014 by Thermodynamics*

**math**

A mother can make good cakes and pies. If she bakes 2 chocolate cakes and 1 apple pie, and then cuts them into 8 pieces each how many pieces would a family of 4 get altogether
*February 27, 2014 by anonymus*

**college algebra**

If a 25 lb weight is attatched to a spring how far will it stretch? I got an answer for a 15 lb weight with 8 inches to be 15/8 but when I plug in 15/8 into my new equation it doesn't come up with the right answer.
*April 7, 2014 by candace*

**chemistry**

Suppose 95.0 mL of HCl gas at 25 ºC and 707 torr is bubbled into 298 mL of pure water. What will be the pH of the resulting solution, assuming all the HCl dissolves in the water?
*April 24, 2014 by Linda*

**chem**

NH3 gas is pumped into the reservoir of a refrigeration unit at a pressure of 2.20 atm. The capacity of the reservoir is 20.4 L. The temperature is 26.1◦C. What is the mass of the gas? Answer in units of g
*May 30, 2014 by reis*

**chemistry**

When water decomposes into oxygen and hydrogen, the mass A. increases B. varies according the number of hydrogen and oxygen molecules that form. C. remains constant D. decreases
*August 23, 2014 by Yui*

**Maths**

Jenna invest R20000 into saving account.the interest paid in the account is 10%pa compounded mounthly.calculate how (in years) it will take for the saving to reach R80000.
*September 14, 2014 by Promise*

**math please help!!!!!**

Factor f(x) into linear factors given that k is a zero of f(x). f(x)=x^3+(12-4i)x^2+(32-48i)x-128i, k=4i In completely factored form, f(x) =____ (factor completely. simplify your answer)
*November 21, 2014 by Ernie*

**Physics**

a rectangular box of negligible mass measures 5m long,1m wide and 0.5m high. How many kilograms of mass can be loaded into the box before it will sink in a freshwater lake?
*January 6, 2015 by Lee*

**math**

Lee wants to cut this piece of canvas into two rectangles that are 3×2 and 3×5. He wants the sum of the areas of the two small rectangles to be the same as the area of the large rectangle. Can he do this? Explain
*January 20, 2015 by dee*

**math **

a 150g-iron ball at 95 Celsius is dropped into a cavity in a block of ice.the cavity is then found to contain 21 g of water . calculate the heat of fusion of ice.
*January 27, 2015 by Ken*

**Language Arts**

If something begins to recede into the distance, what is happening? A. It is moving closer. B. It is growing larger. C. It is growing smaller. D. It is moving farther away. Is the answer C? Thank you
*January 30, 2015 by Callie*

**Grade 8**

The numbers 1 through 9 are put into a hat. What is the probability that all odd numbers will be chosen first if one number at a time is drawn from the hat and not replaced?
*February 6, 2015 by Ellia*

**Algebra 1**

A ball is thrown into the air with the in initial upward velocity of 60 ft/s. It's height (h) in feet after t seconds is given by the function h=- -16t^2+60t+6. What will the height be at t=3 seconds?
*February 11, 2015 by Steve*

**maths**

A copper solid cylinder of radius 14 cm and height 10cm is meter and recast into cylindrical wire of diameter 4mm.find the length of copper wire?
*March 21, 2015 by om*

**Philosophy**

Are humans "blank slates" when they enter this world or do we as humans come into the world with certain truths or idea (whether logical, mathematical, scientific, or moral)?
*March 31, 2015 by TayB*

**world history**

Which of the following statements is true of the Gulf of Tonkin affair? A. Johnson told Congress to pass the Gulf of Tonkin Resolution to let him expand the war. B. Congress was divided and only reluctantly passed the Gulf of Tonkin Resolution. C. The destroyer Maddox was sunk...
*July 30, 2014 by L*

**Chemistry 11**

A hydrate of zinc chlorate, Zn(ClO3)2 .xH2O(s) contains 21.5% zinc by mass. Find the value of x. What I've done: Molar mass of Zn: 65.409 g/mol Molar mass of Cl: 2*35.453 =70.906 g/mol Molar mass of O: 6*15.9994 =95.9964 g/mol Total molar mass of Zn(ClO3)2: 232.3114 g/mol 21% ...
*November 13, 2014 by Anonymous*

**Finance**

Often in personal finance we want to know what our $1 investment today will be worth in 20 years. In business however, there is more concern with answering the question, “If I receive $100 in 5 years, what is that worth today?” To answer this question, modify the formula fv = ...
*June 9, 2012 by John*

**Environmental Science**

Please check my answers. 29. In two or three well-developed paragraphs, explain how pollutin can come from both natural sources and from human activities. Provide examples of each. It is true that pollution can come from both natural sources and from human activities. Although...
*March 9, 2010 by y912f*

**us history**

The declaration of indepdence stated that all men are created equal. Yet there was a condraction in that there were slaves. How did late 18th century americans reconcile this contradiction? how would i organize this essay into 4 paragraphs exluding intro and conclusion
*October 30, 2008 by fred*

**Into to LAN**

• Explain how you would create the users for the sales organization unit and how to set up work groups in this particular situation. Keep in mind that you may have to name certain applications and allowable tasks for each individual or job role.
*September 13, 2009 by Jermaine*

**English/Lit**

In A tale of Two Cities, when Mme Defarge learns Foulon is really alive, she: a-goes to tell him she loves him. b-leads a mob to him where she hangs him and then beheads him. c-provides a safe hiding place for him. d-turns him into the authorities.
*December 5, 2009 by Sha Sha*

**math**

A professional stunt performer at a theme park dives off a tower 21metres high into the water. His height above the ground at time tseconds is given by the equation h=-4.9t^2+21 a. How long does it take to reach the halfway mark?
*November 24, 2010 by ted*

**Chemistry**

a sample of natural gas is 85.2% methan, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this mixture @ 18C and 748mmHg. so i know that i have to use this formula d=(PM)/(RT) but i dont know how to convert the percentages into g/mol (molecular weight) can someone ...
*August 4, 2011 by Henry*

**chemistry**

A strip of aluminium of mass 40.7g is dropped into a beaker of dilute hydrochloric acid. Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 26.1oC ) by the evolution of hydrogen in the subsequent reaction. State any assumptions you have made.
*January 11, 2012 by sand*

**7th grade Lang. Art**

which word in caps makes more sense? Though the colonies long (SEETHE, SINGE) with resentment at the British, the cauldron of their discontent did not boil over into rebellion until 1776. Please help thank you
*January 25, 2012 by saranghae12*

**Spanish**

I need to put these words into sentences using correct verbsto answer the question below. “Qué estás haciendo?” cepillarse los dientes, maquillarse, bañarse, sacar la basura, acostarse, ponerse nervioso/a
*October 14, 2012 by Lynn*

**physics**

Assume you are agile enough to run across a horizontal surface at 8.10 m/s on an airless spherical asteroid of uniform density 1.9x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius?
*November 4, 2012 by Anonymous*

**physics**

Assume you are agile enough to run across a horizontal surface at 8.10 m/s on an airless spherical asteroid of uniform density 1.9x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius?
*November 4, 2012 by Anonymous*

**algebra**

A shipment of 18 cars, some weighting 3000lbs a piece, and the others weighing 5000 lbs each, has a total weight of 30 tons. Find the number of each kind of car. I start of saying X+Y = 18. THen I turn that into X=18-Y. whats next?? thank you for helping if u can.
*March 6, 2013 by Josie*

**POLL - everyone is welcome to answer**

So I am home schooled but it says to ask classmates, which I don't have so I am resorting to the internet. The question is: What do you trust and mistrust about the federal government ? I am also suppose to put the results into a bar graph. How would I set that up? Thanks!
*August 31, 2014 by JayJaytheJet*

**AP Chem**

NH3 + CO2 + H2O are introduced into an empty 1.00L vessel at 115 degrees. The initial partial pressure of at .500 atm. Calculate the number of moles of of solid (NH4)2CO3 that is present when equilibrium is established?
*October 28, 2014 by Megan*

**Chemistry**

If 14.5g of CO2 gas has a volume of 0.13L at 305K , what is its pressure in millimeters of mercury? I've plugged these values into the equation P=nRT/V but I am having troubles with canceling labels and getting the correct answer. Please explain as much as possible to me!
*November 28, 2014 by Anna*

**Algebra**

If a researcher wanted to know the mean weight (the mean is the sum of all the measurements divided by the number of measurements) of women in the U.S., the weight of every woman would have to be measured and then the mean weight calculated, an impossible task. Instead, ...
*September 29, 2014 by Kim*

**visual basic**

Cant get my message dialog box to display anbody see waht wrong with it? The message box is located in my if then else statement Dim total As Integer = 0 Dim gradeCounter As Integer = 0 Dim grade As Integer = 0 Dim average As Double = 0 ' sum grades in ListBox Do ' read grade ...
*May 7, 2009 by cl*

**physics**

A car crashes into a wall at 20 m/s and is brought to rest in 0.1 s. Calculate the average force exerted on a 75 kg test dummy by the seat belt. Force*time= change in momentum mv solve for force.
*September 27, 2006 by barry*

**science- DNA**

Of all possible DNA nucleotide sequences, what sequence of base pairs would dissociate most easily into single strands if the DNA duplex were heated gently?
*August 16, 2007 by manny*

**physics**

1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
*April 18, 2008 by Chris Adison*

**Physics**

An 81 kg baseball player slides into second base. The coefficiant of kintetic friction between the player and the ground is 0.49. a) What is the magnitude of the frictional force? b) If the player comes to rest at 1.6 s, what was his intial velocity?
*October 22, 2009 by Allison*

**English**

if the writer takes an omniscient perspective, and provides insight into the characters' thoughts and motivations, then the point of view is A. individual B. second-person C. first-person D.third-person ithink it is C
*February 1, 2010 by Anonymous*

**algebra**

A baseball player hits a baseball into the outfield. The following equation models the ball's path. If not caught, when will the baseball land? Round to the nearest tenth second. h = -16t^2 + 50t + 4
*October 20, 2011 by tracy*

**Science**

Identify the sources of energy used to power a cell phone and other energies that it can transform into. I put Electrical Energy and it can be transformed to heat,sound,light,and mechanical energy.
*April 2, 2012 by Rezu*

**Physics, please help:)**

A charge rod is brought near a pile of tiny plastic sphere. Some of the spheres are attracted to the rod, but as they touch the rod, they are flung into different directions. Explain. Thanks :)
*September 1, 2012 by Celina*

**physics**

Three wires are arranged in an equilateral triangle as shown in the figure below. The lower two wires are 4.00 apart. Assume all the wires are 1.35 long for this problem (extending into the screen).
*May 19, 2013 by Anonymous*

**physical science**

A 12-kg iron ball is dropped onto a pavement from a height of 90m. Suppose half of the heat generated goes into warming the ball. What is the temperature increase of the ball in degree C
*October 6, 2013 by martha*

**Math**

A rocket is launched into the sky on a windy day. The rocket has a vertical velocity of 15 m/s. There is a strong wind blowing east to west at 35 m/s. How far from the start point is the rocket after 60 seconds?
*February 27, 2014 by Andy*

**Physics**

A 60 kg girl on a swing is pulled 1.5 meters back and then released. The girl oscillates at pi/3 radians per second. How far from equilibrium will the girl be in 4 seconds into the motion? How fast will she be moving at this location?
*March 18, 2014 by Sounders*

**Physics**

1.71 kg of glass (ρ = 2.66 x 10^3 kg/m3) is shaped into a hollow spherical shell that just barely floats in water. What are the (a) outer and (b) inner radii of the shell? Do not assume the shell is thin. Volume = 2.66 * 10^3/1.71 V=1555.56 m^3 V=pi(r^2)h
*November 1, 2014 by Jason*

**Physics**

A baseball player slides into third base with an initial speed of 3.8m/s. If the coefficient of kinetic friction between the player and the ground is 0.40, how far does the player slide before coming to rest?
*February 11, 2015 by Marissa*

**Physics**

A baseball player with a mass of 79 kg slides into homeplate. The coefficient of kinetic friction between the player and the ground is μk = 0.632. If the player comes to rest after 1.04 s, what is his initial speed?
*March 4, 2015 by danny*

**Health (Ms. Sue or Writeacher)**

"A man moved into the apartment next door to Tasi last week. He makes her nervous. Whenever she passes him in the hall, he looks over her whole body. Yesterday, when Tasi came home from school, the man asked her to come over his apartment to watch a movie. When she said she ...
*November 4, 2013 by Anonymous*

**Number Systems**

11100110101 into base 10, base 8, base 16.
*October 6, 2011 by Adam*

**Geology**

Hi there I'm having trouble with this study guide. Could someone please help me? You’ve returned from a recent geologic expedition and discovered that the security at the airport has dumped out all of your carefully sorted rock samples into a heap. You need to quickly sort the...
*December 4, 2013 by Matt*

**physics**

If a baseball pitcher throws a fastball at a horizontal speed of 160km/h how long does it take to reach home plate 18.4m away? In the book it shows 414ms as the answer but I can't get that answer.I divided 18.4 by 160 and got 115 You much change the units so they match. The ...
*September 10, 2006 by sara*

**Math**

A 3-foot piece of wood is cut into two equal sections. How long is each section in inches? a. 9 inches b. 18 inches c. 27 inches d. 36 inches
*March 25, 2014 by Anonymous*

**science geo**

I have to write a brief geological history of a region starting with the oldest events schist being the earlisest and then i have sandstone and gabbro, could you see if what i have wrote is correct The schist would have probably originally been deposited first as a layer of ...
*April 20, 2007 by Bex*

**Health**

Writeacher, could you please check if everything is OK? Thank you very much. 1) My classmates always keep me from work (from the lesson??). I was on the phone with the bank when we were cut off. 2) I was so cross with my boss that I hung up on him.Peter had his house done up ...
*May 12, 2012 by Mike*