Friday

November 21, 2014

November 21, 2014

Total # Posts: 350

**Chemistry**

Please also, help me set up this problem. Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is C2H2(g)+2H2(g)⇌C2H6(g). Given the following data at standard conditions (all pressures equal to 1 atm and the common ...
*November 16, 2014*

**Chemistry**

Help me set up this problem. I have been looking at a few examples of similar problems and I keep getting the wrong answers. I'm getting really confused. Q: The standard free energy change ΔG∘ and the equilibrium constant K for a reaction can be related by the ...
*November 16, 2014*

**Physical science**

Think Critically. The mechanical advantage of a machine is less than one. Compare the distances over which the input and output forces are applied.
*October 29, 2014*

**Art**

Need Snapchat usernames. Its for a project
*October 27, 2014*

**Chemisty**

Need Boys #'s
*October 27, 2014*

**Algebra**

I got it after I post it. Thanks again.
*October 27, 2014*

**Algebra**

A 30-pack of blank CDs costs $9.50. A 50-pack of blank CDs costs $13. How can you tell which is the better buy?
*October 27, 2014*

**Physical Science**

why is the kinetic energy of the lumber higher on the truck during the delivery than when it drops from the carpenter's shoulder?
*October 22, 2014*

**Physical Science**

Thanks!
*October 22, 2014*

**Physical Science**

Explain the role friction plays in the conservation of energy.
*October 22, 2014*

**algebra**

A beauty salon buys bottles of styling gel for $4.50 per bottle and marks up the price by 40%. For what price does the salon sell each bottle?
*October 21, 2014*

**math**

the bag decreased one third, so its weight decreases the same, so: 3/4pound - 3/4 pound*1/3 =3/4pound - 1/4 pound =2/4 pound =1/2 pound
*October 21, 2014*

**Math**

4/25 = 16/100 = 16%
*October 21, 2014*

**Principles of Chemistry**

A certain amount of chlorine gas was placed inside a cylinder with a movable piston at one end. The initial volume was 3.00 L and the initial pressure of chlorine was 1.30atm . The piston was pushed down to change the volume to 1.00 L. Calculate the final pressure of the gas ...
*October 6, 2014*

**Solve. W rite each answer in simplest form.**

6/12 = 1/2
*September 16, 2014*

**Solve. W rite each answer in simplest form.**

Erin buys a bag of peanuts that weighs 3/4 of a pound. Later that week, the bag is 2/3 full. How much does the bag of peanuts weigh now? Show your work
*September 16, 2014*

**SIXTH GRADE MATH**

Sam's credit card balance is less than -$36. Does Sam owe more or less than $36? The answer he owe more than $36.
*September 2, 2014*

**sixth grade math problem**

Bertrand collects movie posters. The number of movie posters in his collection changes each month as he buys and sells posters. The table show how many posters he brought or sold in the given months. January sold 20, February bought 12, March bought 22, April sold 28. 1. Which...
*September 2, 2014*

**Absolute value**

can someone please help me with these questions?
*September 2, 2014*

**Absolute value**

Bertrand collects movie posters. The number of movie posters in his collection changes each month as he buys and sells posters. The table show how many posters he brought or sold in the given months. January sold 20, February bought 12, March bought 22, April sold 28. 1. Which...
*September 2, 2014*

**civics**

Which of the following describes a way geographic features influenced how north american countries were settled ? A. populations were greatest in inland areas where climates were more moderate. B.people settled along the borders between countries to make trade easier. C.people...
*June 4, 2014*

**math**

The test Keyshawn's class took finished at 10:30 A.M. The first part of the test took 30 minutes. There was a 15 minute break. The second part of the test also took 30 minutes. At what time did the test start?
*May 19, 2014*

**3rd grade math**

The test Keyshawn's class took finished at 10:00 A.M. The first part of the test took 30 minutes. There was a 15 minute break. The second part of the test also took 30 minutes. At what time did the test start
*May 19, 2014*

**3rd grade math**

Will arrived at his mother's office at 3 P.M. It took him 30 minutes to walk from his home to the mall. He was in the mall for 45 minutes. It then took him 15 minutes to walk to his mother's office. At what time did Will leave home?
*May 19, 2014*

**3rd grade math**

Explain how you know 6/6 and 1 are equivalent?
*April 8, 2014*

**probability **

a teacher on her way to work passes through 3 stoplights each morning. the distances between the stop lights are great and the lights operate independently of each other. if the probability of the red lights are .4,.8 and .6 for each light, what is the probability to the ...
*February 25, 2014*

**language arts**

Thank you it is!!
*February 19, 2014*

**language arts**

which of the sentences below is punctuated correctly? A.I opened the door and my cat ran outside. B.I opened the door, and my cat ran outside. C.I opened the door, my cat ran outside. I think its B
*February 19, 2014*

**science**

How often would a restriction enzyme such as Not I, which has 8 nucleotides in its recognition sites 5’-GCGGCCGC-3’, cleave DNA on average? Would it cleave a species DNA more or less often if the DNA from that species were 70% A-T rich?
*February 2, 2014*

**Physics Help**

Find components of vector -2r
*February 1, 2014*

**science**

How might the formation of Pangaea have led to mass extinctions at the end of the Permian period, about 250 million years ago?
*January 21, 2014*

**Please i needd an answer asap!!!**

Nevermind i got it. Thank you so much:)
*January 8, 2014*

**Please i needd an answer asap!!!**

A, right?
*January 8, 2014*

**Please i needd an answer asap!!!**

Ok thank you, so for number two its D? because i looked up the meaning of the word simulation and none of it matched with the the answers nor was it close
*January 8, 2014*

**Please i needd an answer asap!!!**

@Ms.Sue
*January 8, 2014*

**Please i needd an answer asap!!!**

I need a little help Ms. Sue. But for the first one i think its A For the second one C Third C
*January 8, 2014*

**Please i needd an answer asap!!!**

I give medals and 'best answer' :) I need help asap! Which of the following is one way to assess whether or not a learning game is effective? a. Being able to win the game b. doing a quiz before and after the game to see what you have learned c. Making it difficult to ...
*January 8, 2014*

**language art 8**

Please help me, i really need to get this. the only question/essay im stuck on. Answer the following questions about the essay "Escaping." Give an example of one internal and one external conflict from the selection (5 points). I need your help!
*December 9, 2013*

**physics**

A barefoot ﬁeld-goal kicker imparts a speed of 44 m/s to a football initially at rest. If the football has a mass of 0.49 kg and the time of contact with the ball is 0.028 s, what is the magnitude of the force exerted by the ball on the kicker’s foot?
*December 6, 2013*

**A/P Calculus**

A Cyclist is riding on a path whose elevation is modeled by the function f(x) = 0.08(16x-x^2) where x and f(x) are measured in miles. Find the rate of change of elecation when x=4. Would this be 0.64? dx/dt would be 1.28 - 0.16x and then plug in four?
*November 9, 2013*

**A/P Calculus**

The derivative of 0.2x is 0.2 ! ohh so when you plug in the five is it just the same outcome 00.2? f(5)=0.2?
*November 9, 2013*

**A/P Calculus**

It is a straight line slope so i would say they depend on each other so the rate of change of elevation when x=5 would be 1?
*November 9, 2013*

**A/P Calculus**

A cyclist is riding on a path whose elevation is modeled by the function F(X)=0.2x where x and f(x) arte measured in miles. Find the rate of change of elevation when x=5. ? Supposed answer: ?? 1
*November 9, 2013*

**chemistry**

3.46896 x 10e-5
*November 6, 2013*

**physics**

A scale is marked off in centimeters on a long table. A coin initially at the position labeled 130.0 is moved to the position marked -20.0. What is the displacement of the coin?
*September 11, 2013*

**chemistry**

Suppose you are asked to find the area of a rectangle that is 2.1-cm \rm cm wide by 5.6-cm \rm cm long. Your calculator answer would be 11.76 cm 2 \rm cm^2 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to...
*August 29, 2013*

**MATH**

Julie is solving the equation x2 + 6x + 9 = 0 and notices that the discriminant b2 - 4ac has a value of 0. This tells her that the equation has...
*May 16, 2013*

**12th grade goverment**

who could vote in elections for colonial legislatures
*May 7, 2013*

**Medical Billing and Coding**

The answer to number 18 is Medicare Part A. Part A covers hospitals. Part B covers medical. Part C was implemented so that those with part a and part b could have more options. Part D is for prescription drug plans.
*April 23, 2013*

**Medical Billing and Coding**

The answer to number 7 is the Balanced Budget Act. I'm sure you've figured that out already but I'm not sure if fellow readers with the same question are able to read other responses.
*April 23, 2013*

**chemistry**

how do i find the specific heat of a metal??
*April 16, 2013*

**Chemistry**

How much silver is present in 3.5 ml of a 1 molar silver nitrate solution?
*March 26, 2013*

**PHysics**

The sound emitted by bats has a wavelength of 3.45 mm. What is the frequency in air? The speed of sound in air is 343 m/s.
*March 21, 2013*

**Physics**

If a proton is moving in a magnetic field with a speed of 4 × 106m/s and is executing uniform circular motion with a radius of 10 cm, what is the magnetic field?
*March 21, 2013*

**Physics**

An electron with a velocity of v = (3 x + 4 y + 2 z) × 106m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1 x - 2 y + 4 z)T. If the electron experiences no force as it moves, calculate the electric field.
*March 21, 2013*

**Physics**

A charged particle is moving downward with an initial speed of 5 × 106m/s when it encounters a uniform magnetic field that points east to west. (a) If the initial force on the particle is to the north, is the particle positive or negative? (b) If B = .25 T and the ...
*March 21, 2013*

**Physics**

An electron with a velocity of v = (3 x + 4 y + 2 z) × 106m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1 x - 2 y + 4 z)T. If the electron experiences no force as it moves, calculate the electric field.
*March 21, 2013*

**Physics**

An electron is shot into a uniform magnetic field B = (.5 x + .8 y)T with an initial velocity of v = (4 x + 3 y) × 106m/s. What is the force on the electron?
*March 21, 2013*

**English 3**

Its "Game" by Donald Barthelme
*March 21, 2013*

**Physics**

Electric charge flows through a wire, which naturally has a cylindrical cross section. Suppose the charge has a current density given by J = A/r, where A is a constant and r is the distance to the wire's central axis. How much current flows through the wire if its radius ...
*March 18, 2013*

**Physics**

Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? What is the electric current in the pipe?
*March 18, 2013*

**statistics**

PLEASE HELP
*March 17, 2013*

**statistics**

Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the ...
*March 17, 2013*

**help with physics**

A bird stands on a bare power line carrying 2500 amps of current. 600 meters of this wire has a resistance of .009 ohms. If the bird's feet are 3 cm apart, what is the voltage difference between the bird's feet?
*March 4, 2013*

**help with physics**

(a) The current through a wire is a steady 2.5 amps. How much current passes through it between t = 0 seconds and t = 4 × 10-4 seconds? (b) The current through a wire is given by I(t) = I0e -at, where I0 = 2.5 amps and a = 6 × 103 s-1. How much electric charge ...
*March 4, 2013*

**help with physics**

A gold wire and a silver wire have the same dimensions. At what temperature will the silver wire have the same resistance that the gold wire has at 20°C?
*March 4, 2013*

**physics**

A 15 ohm resistor is made from a copper wire of mass 14.2 grams. What is the wire's diameter and length?
*March 4, 2013*

**Physics**

An electric filament can heat 200 cm3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?
*March 4, 2013*

**Physics**

A gold wire and a silver wire have the same dimensions. At what temperature will the silver wire have the same resistance that the gold wire has at 20°C?
*February 28, 2013*

**Physics**

A bird stands on a bare power line carrying 2500 amps of current. 600 meters of this wire has a resistance of .009 ohms. If the bird's feet are 3 cm apart, what is the voltage difference between the bird's feet?
*February 28, 2013*

**Physics**

(a) The current through a wire is a steady 2.5 amps. How much current passes through it between t = 0 seconds and t = 4 × 10-4 seconds? (b) The current through a wire is given by I(t) = I0e -at, where I0 = 2.5 amps and a = 6 × 103 s-1. How much electric charge ...
*February 28, 2013*

**Physics**

You have two metal spheres, one with radius 10 cm, the other 7 cm. They each possess a charge of 3 x 10-6 Coulombs. If you touch them together and let the charge come to equilibrium, how much will there be on each sphere?
*February 27, 2013*

**Physics**

A capacitor is made from two parallel plates separated by a distance d, and each has area A. The capacitor holds a charge Q. (a) What is the energy stored in the capacitor? (b) A mechanical force pulls the plates apart, without changing the stored charge, until they are 2d ...
*February 27, 2013*

**Physics**

What is the maximum charge that can be put on a conducting sphere of radius 15 cm if it is not to spark? That is, the electric field at its surface cannot exceed the dielectric strength of air. b) What is the sphere's voltage at this charge?
*February 27, 2013*

**Physics**

If the electric potential is given by V = (-1 volts/m4 )x2yz + (4 volts/m2)yz, find the electric field.
*February 27, 2013*

**Physics**

The work done by an external force on an electron as it moves from point A to point B is 6.3 × 10-14 J. If it was started from rest and had 3 × 10-14 J of kinetic energy when it reached B, what is the potential difference VB-VA?
*February 25, 2013*

**Statistics**

Suppose a data set has a linear regression line of y = 6 -0.8x. If the mean of the x's is 5, what is the mean of the y's? 2 5 10 6 None of the above
*February 18, 2013*

**Physic Help**

Charge is distributed through an infinitely long cylinder of radius R in such a way that the charge density is proportional to the distance from the central axis: ß = A r, where A is a constant and ß is the density. (a) Calculate the total charge contained in a ...
*February 18, 2013*

**Physic Help**

Charge is uniformly distributed along the x axis with density ß. Use Gauss' Law to find the electric field it produces, and use this to calculate the work done on a charge Q that moves along the y axis from y = a to y = b.
*February 18, 2013*

**FInance**

Assume that you have $10,000 which you plan to invest for 3 years. How much more would you have if you invested the funds at 10% with annual compound interest versus 10% with simple interest? No funds will be paid until the end of the 3rd year.
*February 14, 2013*

**Physics Help**

An electron with velocity v = 2.4 × 106 m/s i encounters an electric field E = 1250 N/C i. How long will it take for the speed to be one fourth its original value?
*February 11, 2013*

**Physics Help**

Charge Q is uniformly distributed around the perimeter of a semicircle of radius R. What is the electric field at the circle's center?
*February 11, 2013*

**Physics Help**

Charge is distributed uniformly along the x axis with density ßx and uniformly along the y axis with density ßy. Calculate the electric field at the points (a) r = a i + b j, and (b) r = c k.
*February 11, 2013*

**Physics**

Two identical rods are placed end to end, separated by a gap of width D. Each rod has charge Q spread uniformly along its length L. Calculate the force between the rods. I need some help. My teacher doesn't give us much help. Thank you!
*February 7, 2013*

**Physics**

Two identical rods are placed end to end, separated by a gap of width D. Each rod has charge Q spread uniformly along its length L. Calculate the force between the rods. I need some help. My teacher doesn't give us much help. Thank you!
*February 7, 2013*

**Physics**

Find positions on the x axis for the charges Q1 = -1 C and Q2 = +3 C so that the electric field is zero at x = 0.
*February 7, 2013*

**Physics/Charges**

Point charges Q1 = 50 µC and Q2 = -20 µC are placed 2 meters apart. Where can I put a third charge so that the net electrical force on it is zero?
*February 4, 2013*

**Physics**

Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.
*January 31, 2013*

**Math/Physics**

Two identical tuning forks have frequencies of 512 Hz. If one is held by a listener while the other approaches at a speed of 7.2 m/s, what does the listener hear?
*January 31, 2013*

**Physics**

If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?
*January 30, 2013*

**Physics**

Two objects are connected by a light string that passes over a frictionless pulley as in the fi gure. One object lies on a frictionless, smooth incline. In the figure, m1 = 8.48 kg, m2 = 4.84 kg, and theta = 40.2 degrees . When we let go of the mass m1, it ...
*January 27, 2013*

**science**

An archer exerts an average force of 194 N to draw a 0.25 kg arrow back 1.2 m with the string of the bow. How much work does the archer exert?
*January 24, 2013*

**Physics**

A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?
*January 21, 2013*

**Physics**

A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?
*January 21, 2013*

**Physiology**

How are Lower Body Negative Pressure and hemorrhage similar and different?
*January 21, 2013*

**Physics**

A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?
*January 21, 2013*

**Algebra 2**

how do i simplify this expression? 9x^2 16x^4y^2 -------- x -------- -4x^3y^4 25xy
*December 5, 2012*

**Chem help **

Calculate the pH of a solution containing 0.00001 moles of H3O per liter.
*November 16, 2012*

**math**

i am a 2 digit number when i am rounded to the nearest 10 my 10 digits are less than my ones digit what number am i
*November 5, 2012*

**math**

i am a 3 digit number when i am rounded to the nearest 100 my hundreds digits is one less than my tens digit and 2 less than my ones digit what number am i
*November 5, 2012*