Friday

October 9, 2015
Total # Posts: 491

**chemistry**

Nitrobenzene, C6H5NO2, is prepared from benzene, C6H6, and nitric acid, HNO3. The other product of the reaction is water. When 22.4 g of benzene is reacted with an excess of nitric acid, 31.6 g of nitrobenzene is produced. What is the percent yield for this reaction?
*October 8, 2015*

**physics**

A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 3.6 m to the north, 2.8 m 45◦ north of east, and 2.2 m 59◦ west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole in a ...
*September 25, 2015*

**Maths **

What number am I? I am a multiple of 3 I am also a multiple of 7 My units digit is half my tens digit
*September 22, 2015*

**College Chemistry**

The specific heat of a certain type of cooking oil is 1.75 cal/(g·°C). How much heat energy is needed to raise the temperature of 2.83 kg of this oil from 23 °C to 191 °C?
*September 15, 2015*

**College Chemistry**

When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 5.43 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
*September 15, 2015*

**Statistics**

Please Help me understand how to work this problem. I have been working on this problem for several days and do not understand what to do. Suppose IQ scores were obtained from randomly selected twins. For 20 such pairs, of people the linear correlation coefficient is 0.922 and...
*July 4, 2015*

**geometry**

what is the formula for the volume of a cube? and: what is the formula for the surface area of a cube?
*May 14, 2015*

**University of North Texas**

A manufacturer ships toasters in cartons of 25. In each carton, they estimate a 8% chance that one of the toasters will need to be sent back for minor repairs. In a batch of 12,000 toasters, what are the chances that fewer than 950 need to be returned?
*April 26, 2015*

**Math**

Marco is making a scale model of a building. The building has a round deck at the bottom with a diameter of 120 meters. What should the diameter of the deck in the scale model be if Marco wants the circumference to be 1/40 actual size?
*April 3, 2015*

**physics**

Boxes are moved on a conveyor belt from where they are filled to the packing station 12.0 m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accelerates for half the distance, then decelerates for the ...
*April 2, 2015*

**Physics**

Calculate the electric force between these two electrons. The value of the Coulomb constant 9 × 109 N · m2/C2 and the elemental charge is 1.6×10−19C. Answer in units of N (Newtons)
*March 24, 2015*

**algebra**

-4 x 4 = -16
*March 16, 2015*

**AP Chemistry**

To have a buffer with a pH of 2.50, what volume of 0.510 M NaOH must be added to 100. mL of 0.230M H3PO4?
*March 16, 2015*

**Chemistry**

4 Oxygen x 3 = 12 in one molecule 12 x 6 molecules = 72 atoms of O
*March 16, 2015*

**Chemistry**

a heterogenous mixture
*March 14, 2015*

**algebra**

Solve the system of linear equations by graphing 3x+y=0 2x-y=5 Graph the system What is the solution of the system of equations?
*March 10, 2015*

**CHEMISTRY**

HOW MANY MOLES OF SILVER IODIDE COULD BE PRODUCED IF THIS REACTION WAS STARTED WITH 4.3 MOL IODINE AND AN EXCESS OF SILVER?
*March 5, 2015*

**CHEMISTRY**

HOW MANY MOLES OF SILVER IODIDE COULD BE PRODUCED IF THIS REACTION WAS STARTED WITH 4.3 MOL IODINE AND AN EXCESS OF SILVER?
*March 4, 2015*

**Algebra 2**

for the first part I have 10(2)^14-1 and on the 14th day he'll run about 15.5 miles, but what about the second part
*February 25, 2015*

**Algebra 2**

D'Andre has decided that he needs to get more exercise, so he is building a running regimen for himself. He decides that, beginning on Sunday, he'll fun 10 feet. On each subseqeunt day he'll double the distance he ran the previous day. So he'll run 20 feet on ...
*February 25, 2015*

**chemistry**

what mass of Silver oxide would be required to produce 100.0 g. of silver.
*February 11, 2015*

**math**

Jamiebeatimates that,when he arrives at work tomorrow morning,there is a probability that 0.4 that he will find a convenient parking space. What is Jamie to say? A. It is very unlikely that he will find a convenient parking space. B.it is somewhat unlikely that he will find a ...
*January 22, 2015*

**Science**

Describe genetic engineering on a cellular level. In other words, what exactly takes place during genetic engineering that inserts a trait into an organism that did not have that trait before? Give an example
*January 13, 2015*

**geometry**

A rectangle has a side whose length is 5 and a diagonal whose length is √74. What is the area of the rectangle?
*December 2, 2014*

**Algebra**

A community college campus plans to construct a rectangular parking lot on land bordered on one side by a highway. There are 640 feet of fencing available to fend the other three sides. Let x represent the length of each of the two parallel sides of fencing. a) Express the ...
*November 26, 2014*

**physics**

A car is traveling at 58.2 km/h on a ﬂat highway. The acceleration of gravity is 9.8 m/s2 . If the coeﬃcient of friction between the road and the tires on a rainy day is 0.155, what is the minimum distance in which the car will stop?
*November 10, 2014*

**Anatomy**

Graded potentials are: arise when ion movement causes a minor change in the resting membrane potential. usually propagate down the length of an axon. occur when voltage-gated channels open. are most often observed in axons. are usually associated with ion movement through ...
*November 9, 2014*

**Anatomy**

Graded potentials: arise when ion movement causes a minor change in the resting membrane potential. usually propagate down the length of an axon. occur when voltage-gated channels open. are most often observed in axons. are usually associated with ion movement through leakage ...
*November 9, 2014*

**English for Fernanda**

I need all the answers u have for this exam 986011
*October 30, 2014*

**Wording/Vocab**

No, the words means, "b : to make perfect. c : achieve. 2 : to make (marital union) complete by sexual intercourse <consummate a marriage> intransitive verb."
*October 16, 2014*

**College Physics**

Two crates are connected by a massless rope that passes over a pulley. If the crates have mass 33 kg and 82 kg, find their acceleration. If the system begins at rest, with the more massive crate a distance 12 m above the floor, how long does it take for the more massive crate ...
*October 13, 2014*

**College Physics**

A hockey puck is sliding down an inclined plane with angle θ = 12.4° as shown in the figure below. If the puck is moving with a constant speed, what is the coefficient of kinetic friction between the puck and the plane?
*October 13, 2014*

**College Physics**

There are two forces acting on an object. One force has a magnitude of 35 N and is directed along the +x axis. The other force has a magnitude of 20 N and is directed along the +y axis. What is the direction of the acceleration of the object? Express your answer by giving the ...
*October 13, 2014*

**College Physics**

A skier is traveling at a speed of 39.7 m/s when she reaches the base of a frictionless ski hill. This hill makes an angle of 14° with the horizontal. She then coasts up the hill as far as possible. What height (measured vertically above the base of the hill) does she reach?
*October 13, 2014*

**Physics**

Human feet and legs store elastic energy when walking or running. They are not nearly as efficient at doing so as kangaroo legs, but the effect is significant nonetheless. If not for the storage of elastic energy, a 70.0-kg man running at 4.00 m/s would lose about 100 J of ...
*September 30, 2014*

**Critical Thinking**

What is the premise, conclusion, assumption and counter argument if applicable. I guess Thork doesn’t have a thing to do. Why else would he waste his time watching daytime TV? Premise: Thork doesn’t have anything to do. Conclusion: Thork is watching daytime TV. ...
*September 19, 2014*

**Physics**

A Nile cruise ship takes 21.7 h to go upstream from Luxor to Aswan, a distance of 208 km, and 20.3 h to make the return trip downstream. Assuming the ship's speed relative to the water is the same in both cases, calculate the speed of the current in the Nile.
*September 10, 2014*

**Physics**

An arrow is shot into the air at an angle of 59.4° above the horizontal with a speed of 20.0 m/s. What is the x-component of the velocity of the arrow 3.30 s after it leaves the bowstring? What is the y-component of the velocity of the arrow 3.30 s after it leaves the ...
*September 10, 2014*

**Physics**

A particle's constant acceleration is north at 108 m/s2. At t = 0, its velocity vector is 62.8 m/s east. At what time will the magnitude of the velocity be 118 m/s
*September 10, 2014*

**Geometry**

Three different people are to be selected at random, and each will be given one gift card. There is one card from Home Depot, one from Best Buy, and one from Red Lobster. The first person selected gets to choose one of the cards. The second person selected gets to choose ...
*August 9, 2014*

**math**

Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After hours of burning, a candle has a height of centimeters. After hours of burning, its height is centimeters. What is the height of the candle ...
*July 9, 2014*

**statistics**

UGH! The table is not copying correctly when I post the question. Like Dogs on top horizontal axis Like cats on Vertical axix Yes No under Like dogs Yes No under Like cats yes 194 21(under no on liking dogs) no 110 10
*May 2, 2014*

**statistics**

All that was given to me was this table: Like Dogs Yes No Like Cat YES 194 21 No 110 10
*May 2, 2014*

**statistics**

Table: Like Dogs Yes No Like cats Yes 194 21 No 110 10 For parts a-d give a fraction and % for answer. A.What % of all students like dogs? B. What % of students in the entire class like dogs and cats? C. What % of students who like cats like dogs? D. What % of students who do ...
*May 2, 2014*

**Chemistry**

Nevermind. They were also converting natural log to log10.
*April 17, 2014*

**Chemistry**

At 25 C, RT/F = (8.314 J/mol/K *298 K) /(96500 C/mol) =0.0257 volts. My textbook lists 0.0592. What am I doing wrong?
*April 17, 2014*

**Chemistry**

Write the balanced net ionic equation for the following? a) Copper metal and zinc ion b) zinc and cupric ion c) Copper metal and hydrogen ion d) zinc metal and hydrogen ion e) iron metal and hydrogen ion f) Chlorine (Cl2) and bromide ion (Br-) g) Chlorine (Cl2) and iodide ion...
*April 16, 2014*

**Social Studies**

i say water too
*April 11, 2014*

**statistics**

Assuming that the distribution is normal for weight relative to the ideal and 99% of the male participants scored between (–53.68, 64.64), where did 95% of the values for weight relative to the ideal lie? R
*March 9, 2014*

**Math**

Two friends cut a large candy bar into equal pieces Harriet ate 1/4 of the pieces nisha ate 1/2 of the remaining pieces 6 pieces were left over how many pieces was the candy bar originally divided into
*February 26, 2014*

**Physics**

A block of mass 21.0kg kg slides down a frictionless surface inclined at 33 ∘ ^\circ.To ensure that the block does not accelerate, what is the magnitude of the smallest force that you must exert on it?
*February 19, 2014*

**physics**

A figure skater pushes off from rest and glides along a circular path, the radius of which is 3 times her height. What must be her minimum initial velocity in order to come full circle without having to push off a second time?
*January 25, 2014*

**math**

The question is a real-life question.
*January 25, 2014*

**math**

A figure skater pushes off from rest and glides along a circular path, the radius of which is 3 times her height. What must be her minimum initial velocity in order to come full circle without having to push off a second time?
*January 25, 2014*

**math**

how wide is a rectangular table with a length of 2/3 yard and an area of 1/2 square yard
*January 7, 2014*

**English**

I think I get want to write now. Thanks!
*December 12, 2013*

**English**

My essays on giving people second chances.
*December 12, 2013*

**English**

What should the warrant be about in a argumentative essay?
*December 12, 2013*

**Chemistry 12**

Given the following [H3O+] or [OH-] and the concentration of the solution calculate the dissociation constant, Ka. [OH-] = 3.9 x 10^(-9) M, with a concentration of 0.50M Answer:1.3 x 10^(-11) How do I get this answer?
*November 26, 2013*

**algebra**

Thank u...But how did u get the 162a+9b=.129??
*November 5, 2013*

**algebra**

An archer releases an arrow from a shoulder height of 1.39 m. When the arrow hits the target 18 m away, it hits point A. When the target is removed, the arrow lands 45 m away. Find the maximum height of the arrow along its parabolic path. please help!!I know my points are (0,...
*November 5, 2013*

**algebra**

An archer releases an arrow at shoulder height. â€¢ Measure the distance from the fl oor to your shoulder when you are standing. Suppose you release an arrow and it hits the target at a point 5 ft above the ground. Sketch a possible parabolic path of your arrow...
*November 4, 2013*

**algebra**

A triangle has points A(2, 2), B(2, 4), and C(6, 3) and is reflected over the x-axis. A'B'C' are the coordinates of the reflected image. What is the B' coordinate
*October 31, 2013*

**poetry**

I have to choose a poem to analyze and it has to be classroom appropriate. I was wondering is the poem "The Sick Rose" by William Blake appropriate for a grade 12 classroom? Thanks (posted the poem below) O Rose thou art sick. The invisible worm, That flies in the ...
*October 10, 2013*

**(ENGLISH) please check over english work.**

She is young, I guess she is in her twenties. Instead of writing "I" can I use the word daughter?
*October 8, 2013*

**(ENGLISH) please check over english work.**

I have finished all of the questions, just need someone to look over them. I have posted these questions before, but someone told me to re-do them and I decided to post them again. Canada Day Love Match My mother stalked her future son in law, convinced he was the one for me...
*October 8, 2013*

**poetry**

For Question 1: The persona speaking in the poem is a female who is middle-aged because she can relate to the incidents that the character in the poem is going through. Sounds right when i read it out loud, does it seem right to you?
*October 8, 2013*

**poetry**

Alright, but are my ideas alright?
*October 8, 2013*

**poetry**

I have done the questions, just need someone to look them over to see if they make sense and are correct. THANK YOU! Canada Day Love Match My mother stalked her future son in law, convinced he was the one for me. Through the crowd at the Forks Market, she kept behind him like ...
*October 8, 2013*

**poetry**

Hi, I am analyzing a poem which is Sick Rose by William Blake. O Rose thou art sick. The invisible worm, That flies in the night In the howling storm: Has found out thy bed Of crimson joy: And his dark secret love Does thy life destroy. I need to know the persona in this poem...
*October 7, 2013*

**poetry (Pioneer by Dorothy Livesay)**

I think it is B not sure. can someone clearify
*October 7, 2013*

**Statistics**

1. A simple random sample of FICO credit rating scores is listed below: 714 751 664 789 818 779 698 836 753 834 693 802 a. Find range, variance, and standard deviation. b. As of this writing, the mean FICO score was reported to be 678. Based on these results, is a FICO score ...
*October 5, 2013*

**math **

how do I write 20,000,000+ 70,000+4,000+900 in standard form
*September 23, 2013*

**Physical Science**

Judy (mass 45.0 kg), standing on slippery ice, catches her leaping dog, Atti (mass 12kg), moving horizontally at 4.0 m/s. Use the conservation of momentum to find the speed of Judy and her dog after the catch.
*September 19, 2013*

**science**

what causes scientific knowledge to change?
*September 11, 2013*

**Math (fractions)**

52 - (x/8) = (x/5)
*August 27, 2013*

**Math**

Find the 40th term in the sequence: 4,-1, -5,-11
*June 10, 2013*

**pre algebra**

I have a cube of 3 by 3 by 3 centimeters , I paint all the surfaces white. After that I'd take my saw, and saw it into cubes of 1 by 1 by 1. I will have 27 cubes after. How many will have no white color on any surface?
*May 20, 2013*

**Chemistry**

The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. Please help it only shows a graph with ...
*May 13, 2013*

**Math**

The expression sin 25° cos 47° + cos 25° sin 47° is equivalent to (1) sin 22° (2)sin 81° (3) cos 22° (4) cos 81°
*May 11, 2013*

**Math**

1. The expression log 5x is equivalent to 2. Write the equation of a polynomial whose sum of the roots equals -3 and the product of the roots equals 9\2? P.S. - I have been trying to solve these problems on my own and have not been successful at it. Can someone please help ...
*May 11, 2013*

**statistics**

okay thank you
*May 8, 2013*

**statistics**

students who learned English as well as another language simultaneously score worse on the SAT critical Reading exam than the general population of test takers? The mean score among all test takers on SAT Critical Reading exam is 501 A random sample of 100 test takers who ...
*May 8, 2013*

**statistics**

so, for the fist part it will be (501-485)/116= .1379? what is the SE?
*May 8, 2013*

**statistics**

do students who learned English as well as another language simultaneously score worse on the SAT critical reading exam than the general population of test takers? the mean score di 501. A random sample of 100 test takers who learned English as another language simultaneously ...
*May 8, 2013*

**Calculus**

A cylinder is inscribed in a right circular cone of height 6.5 and radius (at the base) equal to 6. What are the dimensions of such a cylinder which has maximum volume?
*May 2, 2013*

**Calculus**

A woman at point A on the shore of a circular lake with radius 2.5mi wants to arrive at the point C diametrically opposite A on the other side of the lake in the shortest possible time. She can walk at a rate of 3.25 mi/hr and row at a rate of 2 mi/hr. Find shortest time.
*April 30, 2013*

**Physics**

An electron in the c level of a mercury atom returns to the ground state. Which photon energy could not be emitted by the atom during this process?
*April 25, 2013*

**Chemistry**

Calculate the molar mass of a diprotic acid. The reaction reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. How do you get to the final answer? All of the options are ...
*March 31, 2013*

**Math**

One jar of peanut butter and 3 loaves of bread cost $6.70. Three jars of peanut butter and 1 loaf of bread cost $9.32. Find the cost of a jar of peanut butter and a loaf of bread.
*March 23, 2013*

**physics**

A charged particle with a charge-to-mass ratio of |q|/m = 5.7 × 108 C/kg travels on a circular path that is perpendicular to a magnetic field whose magnitude is 0.86 T. How much time does it take for the particle to complete one revolution?
*March 12, 2013*

**Physics**

F=ma F=10x.1 F=.1N
*March 12, 2013*

**Budgeting**

A quaint but well-established coffee shop, the Hot New Café, wants to build a new café for increased capacity. It’s expected sales are $800,000 for the first 5 years. Direct costs including labor and materials will be 50% of sales. Indirect costs are ...
*March 9, 2013*

**math**

A rectangular photograph is mounted on a rectangular card. There is a border ofequal width around the photograph. The perimeter of the card is 40 centimeters longer than that of the photograph. Find the width of the border in centimeters.
*March 5, 2013*

**math**

A rectangular photograph is mounted on a rectangular card. There is a border ofequal width around the photograph. The perimeter of the card is 40 centimeters longer than that of the photograph. Find the width of the border in centimeters.
*March 5, 2013*

**math**

The owner of a luxury motor yacht that sails among the 4000 Greek islands charges $430 per person per day if exactly 20 people sign up for the cruise. However, if more than 20 people (up to the maximum capacity of 90) sign up for the cruise, then each fare is reduced by $4 per...
*February 24, 2013*

**physics**

The membrane that surrounds a certain type of living cell has a surface area of 4.9 x 10-9 m2 and a thickness of 1.2 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.5. (a) The potential on the outer surface of the ...
*February 18, 2013*

**MATH**

7s-5s+10<30 &what work would i do to get this. Thankyou!
*February 6, 2013*

**math 209**

.78=2(3.14)*sqrt.5/g solve for g
*February 5, 2013*

**math 209**

the time t for a pendulum to swing back and forth once is called its period and is given by t=2pi*sqrt l/g where l equals the length of the pendulum solve for g
*February 5, 2013*