Sunday

April 20, 2014

April 20, 2014

Total # Posts: 521

**algebra**

What is the volume of a cylinder? diameter:2cm hieght:9cm

**Chemistry**

The equilibrium constant for the reaction of the weak base aniline is Kb = 4.3e-10. C6H5NH2 (aq) + H2O (l) --> C6H5NH3+ (aq) + OH- (aq). Calculate ΔG at 298 K when [C6H5NH2] = 0.250 M, [C6H5NH3+] = 1.0E-5 M, [OH-] = 0.000480 M i used the equations dG=dG^o - RTlnQ and d...

**Chemistry**

What volume in liters will be required to dissolve 60.9 grams of Mg(OH)2? Ksp = 1.8×10-11 After doing the math, i got 1.58e-4, but its not right, so i have no idea what to do now.

**Math**

I do not know it ?

**ECON**

If you save $250 each year for the next 20 years, how much money would you have if you earned 9%?

**Intro to Geography**

A prime minister is the leader of what type of region? A.)Climate B.)Cultural C.)Economic D.)Political Cultural or political? I think it's cultural idk though HELP please :)

**chemistry **

which of the following summarizes Charles' Law? A. as temperature decreases, the gas particles slow down and take up less space B. as temperature increases, the gas particles slow down and take up less space C. when pressure decreases, the gas particles are allowed to spre...

**Chem**

Cd(s)+Cu+(aq)→Cd2+(aq)+Cu(s)

**math**

Leslie needs 324 inches of fringe to put around the edge of a tablecloth. The fringe comes in lengths of 10 yards. If Leslie buys 1 package of fringe, how many feet of fringe will she have left over?

**math**

52 pound bags

**Computers**

The answer is A, if you don't have the answer yet.

**math**

a rope is cut into three pieces P,Q and R.the lengths of the pieces are in the ratio 3:5:7.if the is 33 feet and 9 inches long,find the lengths of P,Q, and R

**Algebra**

Ramiro earns $20 per hour during the week and $30 per hour for overtime on the weekends. One week Ramiro earned a total of $650. He worked 5 times as many hours during the week as he did on the weekend. Write and solve a system of equations to determine how many hours of overt...

**Calculus 1**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis. y=8-x^2, y= x^2 ; about x=2 V=?

**Calculus 1**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis. y=8-x^2, y= x^2 ; about x=2 V=?

**world history**

Which of the following is true of the Antarctic Treaty System? A. It bans commercial mining in Antarctica. B. It's actually the Society for the Geographic Exploration of Antarctica. C. It was established specifically to enforce ecological regulations. D. It provides the de...

**chemistry**

To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 4.70 nm in diameter? Take the mass of an electron to be 9.11&...

**chemistry**

Assuming that the smallest measurable wavelength in an experiment is 0.990 fm (femtometers), what is the maximum mass of an object traveling at 269 m·s–1 for which the de Broglie wavelength is observable?

**chemistry**

A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1817 miles per hour.

**Statistics**

According to internal testing done by the Get-A-Grip tire company, the lifetime of tires sold on new cars is normally distributed with a mean of 23,000 miles, with a standard deviation of 2500 miles. If the claim by Get-A-Grip is true, what is the mean of the sampling distribu...

**chemistry**

At constant volume, the heat of combustion of a particular compound is –3599.0 kJ/mol. When 1.365 g of this compound (molar mass = 102.90 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 7.819 °C. What is the...

**chemistry**

A 2.50-g sample of powdered zinc is added to 100.0 mL of a 2.00-M aqueous solution of hydrobromic acid in a calorimeter. The total heat capacity of the calorimeter and solution is 448 J/°C. The observed increase in temperature is 21.1 °C at a constant pressure of one a...

**6th Grade Math**

How would you write an expression that is equivalent to 4x4x5x4x5.

**Calculus**

If C(x) = 18000 + 400x − 2.2x^2 + 0.004x^3 is the cost function and p(x) = 2800 − 7x is the demand function, find the production level that will maximize profit. (Hint: If the profit is maximized, then the marginal revenue equals the marginal cost.)

**Calculus**

If C(x) = 18000 + 400x − 2.2x^2 + 0.004x^3 is the cost function and p(x) = 2800 − 7x is the demand function, find the production level that will maximize profit. (Hint: If the profit is maximized, then the marginal revenue equals the marginal cost.)

**Science**

A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. What best describes? A. Solution or iron and sulfer can be seperated...

**Science**

thank you

**Language Homophones**

What is the homophone for racecourse.?

**physics**

A parachutist with a camera, both descending at a speed of 14 m/s, releases the camera at an altitude of 31.7 m. What is the magitude of the velocity of the camera just before it hits the ground? The acceleration of gravity is 9.8 m/s 2 and air friction is negligible.

**Physics**

An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.9 m/s in 3.70 s. (a) What is the magnitude and direction of the bird’s acceleration? (b) Assuming that the acceleration remains the same, what is the bird’...

**Chemistry**

For the following electrochemical cell, Co(s)/Co2(aq,.0155M)// Ag+(aq,2.50M)/Ag(s) 1.Write the net cell equation. 2.Calculate the following values at 25 degrees celcius. Eocell, Ecell, deltaGo rxn, and delta Grxn

**Chemistry**

Separate this redox reaction into its component half-reactions. O2 + 2Mg----> 2MgO

**Chemistry**

A current of 3.94 A is pass through a Pb(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 5.40 g of lead?

**chem 2**

A buffer solution is made using a weak acid, HA. If the pH of the buffer is 1.0 × 101 and the ratio of A– to HA is 10, what is the pKa of HA?

**chem 2**

A buffer solution is made using a weak acid, HA. If the pH of the buffer is 1.0 × 101 and the ratio of A– to HA is 10, what is the pKa of HA?

**Chem 2**

At 25 °C only 0.0570 mol of the generic salt AB is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C?

**Literature**

What was a tense or exciting moment in A Raidin in the Sun and Antigone? What literary device was used?

**algebra**

Write the equation of the line in slope-intercept form that passes through the point (3, -2) and has a slope of 2.

**Algebra**

Calculate elements the listed element for the product matrix. matrix[1, 2, -3_3, 4, 0_-9, 7, 8_9, 3, 2]Xmatrix[11, 7, 9, -5_5, -9, 1, 6_4, 2, -3, -8] Can someone please help me with this. I'm desperate.

**sew**

A chemical substance that causes dyes to set is called?

**History **

According to King, how did the Vietnam War affect U.S. policy at home?

**Economics**

What describes a tax that is assessed according to benifits received principle? a.) Thosew who recieve direct payment of the money tha tax generates are the people who pay the tax b.) Those who pay the tax recieve the benifits the tax provides. c.)One group recieves benefits f...

**Math**

2 root 2 sin 2t + 2 root 3 tan 2t = 0

**Math**

2 root 2 sin 2t + 2 root 3 tan 2t = 0

**Math**

2 root 2 sin 2t + 2 root 3 tan 2t = 0

**6th grade math**

Help please!!

**math**

what is four fifths+three fifths

**Consumer Math**

Your parents are buying a house for $187,500. They have a good credit rating, are making a 20% down payment, and expect to pay $1,575/month. The interest rate for the motrgage is 4.65%. What must their realized income be before each month and how much interest is accrued at th...

**English 11 B**

What are some effects of war on literature?

**Spanish**

I need help answering the questions. especially in part B

**Spanish**

Un amigo te pregunta quiénes están haciendo varios trabajos. Responde sus preguntas con frases completas. 1. ¿Quién saca fotos? 2. ¿Quién apaga el incendio? 3. ¿Quién investiga el crimen? 4. ¿Quién sirve com...

**Spanish**

Un amigo te pregunta quiénes están haciendo varios trabajos. Responde sus preguntas con frases completas. 1. ¿Quién saca fotos? 2. ¿Quién apaga el incendio? 3. ¿Quién investiga el crimen? 4. ¿Quién sirve com...

**Math**

Kim is researching the number of channels available from different cable and satellite companies what would be an appropriate graph to use : A. Line plot B. line graph C.bar graph D.frequency table E. pictograph PLEASE HELP!!!!

**chemistry**

At constant volume, the heat of combustion of a particular compound is –3323.0 kJ/mol. When 1.489 g of this compound (molar mass = 131.02 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 8.077 °C. What is the...

**chemistry**

In a constant-pressure calorimeter, 75.0 mL of 0.830 M H2SO4 was added to 75.0 mL of 0.310 M NaOH. The reaction caused the temperature of the solution to rise from 23.20 °C to 25.31 °C. If the solution has the same density and specific heat as water, what is ΔH fo...

**math**

when you divide by 4,what remainders are possible? explain your answer :)

**chemistry/physics**

If a rock climber accidentally drops a 69.0 g piton from a height of 305 meters, what would its speed be just before striking the ground? Ignore the effects of air resistance.

**Chemistry**

What is the limiting reagent when 10.8 g water reacts with 4.7 g Na to produce NaOH and H2?

**math**

Jamie and Bryce each have a bag of candy containing 40 gumballs that are either red or blue. The ratio of red to blue gumballs in Jamie's bag of candy is 1:3, and the ratio of red to blue gumballs in Bryce's bag of candy is 1:4. How many more red gumballs does Jamie ha...

**chemistry**

You have 37.0 mL of a 3.00 M stock solution that must be diluted to 0.500 M. How much water should you add?

**chemistry**

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 19.9 g of biphenyl in 34.3 g of benzene?

**calculus**

find all discontinuities (16x/2x3-8x3=0)

**the wreck of the hesperus**

what is an example in the poem for an assonance

**math**

5{7 + [(12-2)+ 5]25}=

**Math**

Twelve of your family members went to the movies. The admission price for adults is $6 and children is $4. How many adults and children went to the movie if the total cost for your family was $54?

**Math**

67

**criminology**

Which of the following is not considered to be one of the most important groups contributing to the process of socialization, according to social process theories?

**independent practice**

It has 5 hundreds . The tens digit is 1 lees than the hundreds digit.the ones digit is 2 more than the hundreds digit

**physics**

michael starts at x=3 m and travels to the right at a constant 6 m/s for 2 s. he then slows down at a constant rate, coming to rest at 4 s after beginning to slow. A) what is michael's position when t=4 s.? C) What is Michael's velocity when t=4 s? d) What is Michael&#...

**math**

What is the sum of a 22–term arithmetic sequence where the first term is 56 and the last term is –28

**math**

we have to find the coordinate point

**Chemistry Stoichiometry**

Sulfuric acid can dissolve aluminum metal according to the following reaction. Suppose you wanted to dissolve an aluminum block with a mass of 25.7 . How many grams of H2 gas would be produced by the complete reaction of the aluminum block?

**Physics**

A skier of mass 79.1 kg, starting from rest, slides down a slope at an angle q of 38 with the horizontal. The coefficient of kinetic friction, m, is 0.09. What is the net work (the net gain in kinetic energy) done on the skier in the first 8.9 s of descent?

**geometry**

AB=2x+9,BC=4x-5

**math**

how many minivans (15 minivans) would pass susan if 60 vehicles passed her

**Physics based Calculus**

Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can thr...

**Physics**

ok....

**math test**

ok this past week i was sick 4 2 days and i need 2 finish this math test by today!!!! and i didn't get 2 learn anything like u know, not practive soo plz anwser these questions: 1.what is a concave polygon 2.what are concentric cicles? 3. what does this mean: a polygon tha...

**subjects and predicates**

thank you ms. sue!!!!!

**subjects and predicates**

i need some more help about predicates and subjects what would the subject to these? _____________ i went to school last Wednesday what subject would go on the blank and how about these other blank subjects _________ did not understand the joke. ____________ barked so loudly t...

**chemistry**

What is the mass in grams of 9.00×10^14 iron atoms, each having a mass of 56 { amu}?

**Linear Algebra**

Solve the initial value problem: xdy/dx+4y=7x^3-10x for y(1)=4

**science**

the controls are the substance. material in the experiment that stays constant and doesn't change while. the variable is the object compared to the control which varies in results and can change through out the course of the experiment.

**Math**

The ratio of red jelly beans to yellow jelly beans in a dish is 3:4. If Greg eats 3 red jelly beans and 6 yellow ones, the ratio is 4:5. How many yellow jelly beans were originally in the dish?

**math**

what is the volume of a rectangular prism 5.0cm long, 3.8cm wide and 2.7cm high?

**science**

1) - Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session i...

**computers**

who created coach leather

**Social Studies**

A series of legislative acts passed under the Grant administration in 1870 and 1871 authorized federal protection for black suffrage through the use of the Army against the Ku Klux Klan. Together, these were known as the _______ Acts.

**physics**

It is estimated that in the United States (population 250 million) there is one electric clock per person, with each clock using energy at a rate of 3.5 W. Using this estimate, how much energy is consumed by all the electric clocks in the United States in a year? 1 . J I got 2...

**physics**

thanks! i got it

**physics**

The current in a lightning bolt is 1.6 105 A. How many coulombs of charge pass through a cross-sectional area of the lightning bolt in 0.70 s? I dont know how to set this up???

**physics**

How much would it cost to watch a football game on the television with a power rating of 300 W for 3.0 h if electrical energy costs $0.10/kW·h? 0.108 wasent right

**physics**

How much current is drawn by a television with a resistance of 21 that is connected across a potential difference of 120 V? 5.45A wasnt right

**physics**

A net charge of 47 mC passes through the cross-sectional area of a wire in 19.0 s. (a) What is the current in the wire? 1 A (b) How many electrons pass the cross-sectional area in 1.0 min? 2 . electrons I got 9.3e+22 for B but its wrong

**trig**

2sin(4x)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x can someone simplify this using trig identities?

**trig! please help!**

to bobpursely: i need to simplify the expression using trig identities. and no i meant for there to only be x

**trig! please help!**

2sin(4t)[(cos(3/2)x)(cos(5x/2)-sin((15/4)x)]+x

**physics**

A 20.0-kg model plane flies horizontally at a constant speed of 12.2 m/s. (a) Calculate its kinetic energy. . J (b) The plane goes into a dive and levels off 20.0 m closer to Earth. How much potential energy does it lose during the dive? Assume no additional drag. J (c) How mu...

**physics**

An archer puts a 0.26-kg arrow to the bow-string. An average force of 200 N is exerted to draw the string back 1.4 m. (a) Assuming no frictional loss, with what speed does the arrow leave the bow? m/s (b) If the arrow is shot straight up, how high does it rise? m

**physics**

we dont have textbooks, and my teacher dosent teach, he just gives us really hard homework:(

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