Sunday

March 29, 2015

March 29, 2015

Total # Posts: 1,212

**chemistry**

What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?
*May 30, 2012*

**science**

- thanksss . ^_______^
*May 29, 2012*

**science**

i think its number 4 .
*May 29, 2012*

**science**

2 or 3 >????? -_-
*May 29, 2012*

**science**

the threat of global warming is mainly associated with ? 1 radioactive wastes 2 use of hydroelectric energy 3 burning of fossil fuels 4 thermal pollution of lakes and rivers
*May 29, 2012*

**Geometry**

A plane is heading west at 200 mph. The wind is blowing S30°W at 25 mph. 1. what is the ground speed of the plane? I could not figure this one out. Please help?
*May 21, 2012*

**algebra**

The equation that describes the path of a small rocket after it is shot into the air is h=1120-16t^2, where h is the height above the ground, in feet, after t seconds. How many seconds does it take for the rocket to return to the ground?
*May 19, 2012*

**business**

How does TerraCycle use its size and flexibility to gain a competitive advantage? How has the company extended its product line? How well do the new products fit the company’s strategy and image? Explain. How does TerraCycle’s culture reinforce its focus on innovation?
*May 15, 2012*

**MATH PLS HELP**

A research center claims that 50% of people believe that drivers should be allowed to use cellular phones with hands free devices while driving. In a random sample of 150 U.S. adults 58% say that drivers should be allowed to use cellular phones with hands free devices while ...
*May 11, 2012*

**Statistics**

A research center claims that 50% of people believe that drivers should be allowed to use cellular phones with hands free devices while driving. In a random sample of 150 U.S. adults 58% say that drivers should be allowed to use cellular phones with hands free devices while ...
*May 11, 2012*

**algebra 2**

Classify the conic section . Write its equation in standard form. 4x^2-y+3=0?
*May 3, 2012*

**algebra 2 please check**

Write an equation for a parabola with vertex at (-4 , 3) and focus at ( -4, -2)? I have this.... (X+4)^2=20(y-3)
*May 3, 2012*

**algebra 2 please check**

Identify the line(s) of symmetry for the conic section x-(y-1)^2=2 I have this... (Y-1)^2=(x-2) Vertex (2,1) Symmetry y=1. Is this correct?
*May 3, 2012*

**algebra 2**

Write the equation for a parabola with vertex (-2 , 3) and focus ( -2, 1).
*May 3, 2012*

**algebra**

Identify the line(s) of symmetry for the conic section x-(y-1)^2=2
*May 2, 2012*

**UMA**

Life Direction has three parts: vision, setting goals and a plan of action
*April 29, 2012*

**physics**

On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. This satellite was injected into an orbit 705 {\rm km} above the earth's surface, and we shall assume a circular orbit. How many hours does it take this satellite to make ...
*April 27, 2012*

**Math**

prove the identity: sin^2 O/ 1-cos O = 1+cosO O= theta
*April 27, 2012*

**Physics. PLEASE HELP!!**

How do you calculate the y component. Answer in units of Nm. How do you calculate the z component. Answer in units of Nm.
*April 25, 2012*

**Physics. PLEASE HELP!!**

A force F=Fx ˆi + Fy ˆj + Fz ˆk acts on a particle located at X= (x, y, z). Given Fx=−88.3N, Fy=7.56N, Fz=60N, x= −3.65m, y=1.67m and z=7.03m, calculate the three components of the torque vector ~ = xˆi + y ˆj + z ˆ...
*April 25, 2012*

**Physics. PLEASE HELP!!**

Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic energy of the ...
*April 25, 2012*

**Calc 1**

An 8 foot tall fence seperates Larry's yard from Evan's yard.The fence is 3 feet from Larry's house and runs parallel to the side of his house. Larry wants to paint his house and needs to position a ladder extending from Evan's yard over the fence to his house...
*April 24, 2012*

**Calculus**

A flower pot is dropped from a point 12 feet above the ground,so that it will land 4 feet from the base of a 12 foot lamppost. At what rate is the shodow of the flower pot moving along the ground when the pot is 8 feet above the ground?
*April 24, 2012*

**Physics. PLEASE HELP!!**

A force F=Fx ˆi + Fy ˆj + Fz ˆk acts on a particle located at X= (x, y, z). Given Fx=−88.3N, Fy=7.56N, Fz=60N, x= −3.65m, y=1.67m and z=7.03m, calculate the three components of the torque vector ~ = xˆi + y ˆj + z ˆ...
*April 23, 2012*

**Physics. PLEASE HELP!!**

Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic energy of the ...
*April 23, 2012*

**writing**

Write a 150- to 200-word paragraph to explain how purpose, audience, tone, and content would impact the following topic: What do you hope to accomplish COM 155? Be sure to use the three components of a good paragraph covered in this week’s readings. In addition, be sure ...
*April 23, 2012*

**Physics. PLEASE HELP!!**

Consider a wheel (solid disk) of radius 0.748 m, mass 16 kg and moment of iner- tia 1/2 MR^2 . The wheel rolls without slipping in a straight line in an uphill direction 27 above the horizontal. The wheel starts at angular speed 20.5882 rad/s but the rotation slows down ...
*April 20, 2012*

**Physics. PLEASE HELP!!**

A uniform disk with a mass of 130 kg and a radius of 1.2 m rotates initially with an angular speed of 950 rev/min. A constant tangential force is applied at a radial distance of 0.5 m. How much work must this force do to stop the wheel? Answer in units of kJ
*April 20, 2012*

**Physics. PLEASE HELP!!**

A 1.2 m diameter wagon wheel consists of a thin rim having a mass of 11 kg and six spokes, each with a mass of 1.1 kg. Find the moment of inertia of the wagon wheel for rotation about its axis. Answer in units of kg · m2
*April 20, 2012*

**sliva**

a solution is made by dissolving 3.95g of NaCl in 78.2 mL what is the concentration of sodium chloride in units of weight/volume percent
*April 16, 2012*

**physics**

The magnitude of a vector is always : - a positive number - greater than 1 - an integer - none of the above.
*April 12, 2012*

**PHYSICS HELP !**

when telling someone how to get to your house from campus, you need to a) give your direction of travel b) give your distance they need to travel c)give both directions and distance d) not enough information
*April 12, 2012*

**Physics. PLEASE HELP!!**

A ball bounces to 45 percent of its original height. What fraction of its mechanical energy is lost each time it bounces? What is the coefficient of restitution of the ball-floor system?
*April 11, 2012*

**Physics. PLEASE HELP!!**

Your answers are incorrect. But thank you for your help. :)
*April 11, 2012*

**Physics. PLEASE HELP!!**

A ball bounces to 45 percent of its original height. What fraction of its mechanical energy is lost each time it bounces? What is the coefficient of restitution of the ball-floor system?
*April 11, 2012*

**health**

It's not c bc I got c wrong on my test
*April 11, 2012*

**Physics. PLEASE HELP!!**

A small car of mass 985 kg is parked behind a small truck of mass 1551 kg on a level road. The brakes of both the car and the truck are off so that they are free to roll with negligible friction. A 83 kg woman sitting on the tailgate of the truck shoves the car away by ...
*April 7, 2012*

**Physics. PLEASE HELP!!**

A 1.3 kg steel ball and 8 m cord of negligi-ble mass make up a simple pendulum that can pivot without friction about the point O. This pendulum is released from rest in a horizontal position and when the ball is at its lowest point it strikes a 1.3 kg block sitting at rest on ...
*April 7, 2012*

**Physics. PLEASE HELP!!**

When a 0.35 kg baseball is hit, its velocitychanges from 21 m/s to -29.5 m/s. What is the magnitude of the impulse de-livered by the bat to the ball? Answer in units of N · s
*April 7, 2012*

**Please Chemistry Help**

can you explain it a little more cuz i really didnt understand anything!!!! thank you!
*April 6, 2012*

**Please Chemistry Help**

for the transition of an electron in a hydrogen atom between the principal quantum number levels 4 and 3, calculate a) the energy released b) the wavelength of the line in the spectra.
*April 6, 2012*

**Trig Help Please!!!**

thank you!!!
*April 5, 2012*

**algebra**

In Chemistry class, Andrew has earned scores of 64, 69, and 73 on three tests. He must maintain an average of 70 to pass the course. What score must Andrew earn on the final exam to pass the course?
*April 5, 2012*

**Physics**

A 6 kg block moves at 5 m/s to the right while a 9.5 kg block moves at 8 m/s to the right. Find the total kinetic energy of the two-block system. Answer in units of J
*March 31, 2012*

**Physics**

Three balls with masses of 4 g, 6 g, and 4 g,respectively, are connected by massless rods. The balls are located (in meter intervals).What is the x-coordinate of the center of mass? Answer in units of m
*March 31, 2012*

**Physics**

if you had two ping pong balls (or golf balls, or tennis balls), both carrying the maximum possible positive electrical charge, and you also had insulating gloves that allowed you to pick them up without being shocked, would you be strong enough to make the charged balls touch...
*March 29, 2012*

**Chemistry Help!!!!!!**

i really need help with this right now!!!!
*March 29, 2012*

**Chemistry Help!!!!!!**

95.65 grams of barium hydroxide were dissolved in 2000ml of water. 88 grams of carbon dioxide were passed through the solution producing a white precipitate. what was this white precipitate and how many grams of it were produced. explain please!!!! i got so confused with this...
*March 29, 2012*

**ALGEBRA**

Perimeter of some traffic signs must be 74 inches.It's length is 11inches longer than it's width. What are the signs dimensions?
*March 28, 2012*

**ALGEBRA**

A non toxic floor wax can be made from lemon juice and linseed oil.The amount of oil should be 2 times the amount of lemon juice. How much of each ingredient is needed to make 30 ounces of floor wax?
*March 28, 2012*

**ALGEBRA**

A hardware supplier manufactures three kinds of clamps, types A, B, and C. Production restrictions force it to make 10 more type C clamps than the total of the other types and twice as many type B clamps as type A clamps. The shop must produce 250 clamps per day. How many of ...
*March 28, 2012*

**ALGEBRA**

The perimeter of a traffic sign must be 128 inches. It's length is 8 inches longer than the width. find the dimensions.
*March 28, 2012*

**ALGEBRA**

SOLVE IN LINEAR EQUATION? A university bookstore recently sold a wirebound graph paper notebook for $1.08, and a college ruled notebook for $3.12.At the start of the spring semester, a combination of 50 of these notebooks were sold for a total of $88.68 .How much of each type ...
*March 28, 2012*

**COLLEGE ALGEBRA**

An investment of $63,000 was made by a business club. The investment was split into three parts and lasted one year. The first part of the investment earned 8% interest, the second 6% and the third 9%. Total interest from the investments was $4950. The interest from the ...
*March 25, 2012*

**COLLEGE ALGEBRA**

An investment of $63,000 was made by a business club. The investment was split into three parts and lasted one year. The first part of the investment earned 8% interest, the second 6% and the third 9%. Total interest from the investments was $4950. The interest from the ...
*March 24, 2012*

**NCSU**

A man of mass 83.5 kg walks down the aisle of an airplane at a speed of 1.60 m/s in the forward direction while the plane moves at a speed of 295 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy ...
*March 24, 2012*

**math**

Quotient: 47 Divisor:64 Dividend is what?
*March 13, 2012*

**college physics**

THIS IS NO HELP ???
*March 8, 2012*

**college physics**

a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....
*March 8, 2012*

**Physics**

What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp?
*March 6, 2012*

**Physics**

Pendulum A is 20 cm long and has a 5 g mass on it. Pendulum B is 30 cm long and has a 10 g mass on it. Which one has a faster period?
*March 1, 2012*

**math**

Write expressions for other five trigonometric ratios for each acute angle: a. csc(theta 0) = a/b b. sec(beta B) = x+1/x-1, x not equal 1
*February 25, 2012*

**Chemistry**

When 3.2 moles of Al react with excess HNO3 at STP, How many liters of H2 are formed
*February 23, 2012*

**Biology Lab**

HOw much Nacl (MW= 58.44g) would you need to ass to a solution if you wanted to make 100 ,mL of 4* 10 to the -3 M NaCl?
*February 22, 2012*

**physics**

Would the q be -1.6X10-19? If so then I know what to do from there.
*February 19, 2012*

**physics**

An electron at rest is found to have a force of 0.40 N to the left. What is the electric field (magnitude and direction) at the location of the electron?
*February 19, 2012*

**Math**

fabio said that there are 3 time as many people on a basetball team as on a tennis team is he correct explain why or why not
*February 15, 2012*

**English**

Explain relationships between two or more seemingly unrelated things.
*February 8, 2012*

**Math**

If The cat is a little more than 1 foot tall what is a good estimate for the length of computer screen?
*February 8, 2012*

**English**

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaae354654fsddgfgggggggggggggggggggggggggggggggggggggggggggff-u
*February 7, 2012*

**chemistry**

to produce 4.00 mole if c6h12 from the following how many grams of c6h6 must you combine 78.12 g/mol c6h6 + 2.02 g/mol h2 = 84.18 g/mol c6h12
*February 7, 2012*

**computers**

Assume you have a computer that contains 2GB of memory. It contains four memory slots. Each slot can contain 128 MB, 256 MB, 512MB, 1 GB, or 2GB memory modules. Currently, each slot contains a 512MB memory module. What combinations of memory modules will satisfy your memory ...
*January 30, 2012*

**STATISTICS**

the percentage of adults who have at some point in their life been told that they have hypertension is 23.53%. If 8 adults are randomly selected, find the probability that between 2 and 4 of then inclusive have been told that they have hypertension
*January 26, 2012*

**APUSH**

apush blows am i rite ladiez
*January 24, 2012*

**algebra**

D is the set of whole numbers less than 3. (1 point) D = {0,1,2,3,4,5}; D = {x is a whole number, x < 3} D = {0,1}; D = {x | x < 3} D = {0,1,2}; D = {x | x is a whole number, x < 3} D = {0,1,2,3,4,5,6,7}; D = {x < 3}
*January 22, 2012*

**information literacy**

Which of the following sets of Library of Congress call numbers is in the correct order? A. P201 .A251 1977, PA 203 .B252 1971, PE205 .C253 1954, PH202 .H255 1965 B. PA 203 .B252 1971, P201 .A251 1977, PE205 .C253 1954, PH202 .H255 1965 C. PE205 .C253 1954, PH202 .H255 1965, ...
*January 21, 2012*

**information literacy**

Use one of the sources available in the Almanacs and Yearbooks section to identify the approximate time of sunrise in Anchorage, Alaska, on December 25, 2015. (Hint: Check the source's Astronomy section.) A. 8:10 A.M. B. 9:45 A.M. C. 11:30 A.M. D. 10:15 A.M. answer is c
*January 21, 2012*

**information literacy**

Identify the publisher and the number of pages for Ellison's 2002 edition of Invisible Man. A. Vintage International, 581 pp B. Gollancz, 439 pp C. Random House, Inc., 439 pp D. Modern Library, 290 pp Answer C
*January 21, 2012*

**algebra**

D is the set of whole numbers less than 3. (1 point) D = {0,1,2,3,4,5}; D = {x is a whole number, x < 3} D = {0,1}; D = {x | x < 3} D = {0,1,2}; D = {x | x is a whole number, x < 3} D = {0,1,2,3,4,5,6,7}; D = {x < 3}
*January 21, 2012*

**Physics Distance and Displacement Question? **

A passenger in the rear seat of a car moving at a steady speed is at rest relative to the side of the road. a pedestrian on the corner ahead. the front seat of the car. the wheels of the car. Thanks ^_^
*January 17, 2012*

**Physics**

a water wave has frequency 0.40 Hz and wavelength 2.0m. Its speed is
*January 10, 2012*

**Physics**

a water wave has frequency 0.40 Hz and wavelength 2.0m. Its speed is
*January 10, 2012*

**Physics**

a water wave has frequency 0.40 Hz and wavelength 2.0m. Its speed is
*January 10, 2012*

**Social Studies**

Why Do You Think It Was Hard For Spain To Maintain It's Empire ? Explain.
*December 17, 2011*

**History**

Do You Think It Was Right Or Wrong For The United States To Declare War On Spain ? Explain.
*December 17, 2011*

**Chem **

what mass of KCl in grams is formed with 20 lbs of KClO3 is decomposed KCl03 yields KCl + O2
*December 15, 2011*

**Chem**

When 30.0 grams of aluminum reacts with HCl how many grams of aluminum chloride are formed? Al = HCl yields AlCl3 + H 2
*December 15, 2011*

**Chem**

Where is the 12g coming from?
*December 15, 2011*

**Chem**

calculate the mass in grams of carbon needed to produce 160 grams of CO2 burning. C + O2 -> CO2
*December 15, 2011*

**Physics**

What force would be needed to accelerate a 0.040-kg golf ball at 20.0 m/s^2??
*December 14, 2011*

**physics**

i need the answer not the equation???
*December 14, 2011*

**physics**

is that the correct answer?
*December 14, 2011*

**physics**

A baseball player throws a ball. While the 700.0-g ball is in the pitchers hand, there os a force of 125N in it. What is the accerleration of the ball?
*December 14, 2011*

**Extra Credit Projects**

Create a scrapbook for english , it's very fun and exciting !
*December 13, 2011*

**History **

Why Do You Think It Was Hard For Spain To Maintain It's Empire ?
*December 13, 2011*

**English**

I have to do an essay and i have trouble answering some of the questions.Thnaks!I need help with the second question.(its anthropology) 1)whatare Different forms that marriages take in the world? Polygany, monogamy, polygny, polyondry,exogomy & exogomy. 2)What are some of the ...
*December 10, 2011*

**SCIENCE-PLS HELP!**

Hold on i'll help youu!
*December 8, 2011*

**Chemistry**

A rock contains 200. µmol 238U (t1/2 = 4.5 109 yr) and 116 µmol 206Pb. Assuming that all the 206Pb comes from decay of the 238U, estimate the rock's age. Please explain step by step.
*December 7, 2011*

**English**

what is a Ninus’ Tomb & Metaphor?
*December 6, 2011*

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