Monday

October 24, 2016
Total # Posts: 2,844

**calculus**

Let f(x) = 2ln(cosx), find f''(x)

*February 12, 2013*

**Calculus**

Find the derivative of y = (ln(2x))/2x

*February 12, 2013*

**Calculus**

Find the derivative of y = (ln(3x))^4

*February 12, 2013*

**Calculus**

Solve for x in the equation ln(16-12x)-2lnx = ln4

*February 12, 2013*

**Calculus**

Solve for x in the equation ln(16-12x)-2lnx)= ln4

*February 12, 2013*

**calculus**

Calculate g'(36^(1/2)), where g is the inverse of f(x) = ((x*x)+16x) for x less than or equal to -16

*February 12, 2013*

**Algebra**

There are 21 people. The number of adults is 3 fewer than 5 times the number of children. How many adults are there? How many kids are there?

*February 10, 2013*

**physics**

Part A, use the following equations: d= vt and x=v(i)t+(1/2)at^2

*February 9, 2013*

**physics**

A charge moves a distance of 1.4 cm in the direction of a uniform electric field having a magnitude of 244 N/C. The electrical potential energy of the charge decreases by 108.3 × 10−19 J as it moves. Find the magnitude of the charge on the moving particle. The ...

*February 8, 2013*

**physics**

A positive test charge of 8.33 × 10−5 C is placed in an electric field of 53.54 N/C intensity. What is the strength of the force exerted on the test charge? Answer in units of N

*February 8, 2013*

**Algebra**

A ladder reaches a height of 16 feet on a wall. If the bottom of the ladder is placed 4 feet away from the wall, what is the slope of the ladde as a positive number?

*February 7, 2013*

**math**

u have 15 white tiles. if u add some black tiles so that 3 out of 4 tiles are white, how many black tiles will u need?

*February 7, 2013*

**physics**

A 1500.0 kg car accelerates uniformly to double its speed from 35.9 km/h in 4.74 s. What net force acted on this car?

*February 5, 2013*

**English**

L The model airplane in my brother's room was made in Germany. Does in my brother's room describe the airplane?

*February 4, 2013*

**English**

We only had to do the one prepositional phrase. What about this one? The plant on the windowsill thrives in the spring. Does in the spring modify thrives?

*February 4, 2013*

**English**

What word is being modified by the prepositional phrase? The monkeys ran from the sound of humans? Is it sound?

*February 4, 2013*

**physics**

Hi, I was wondering if anyone could answer my question. A two head collision. One car is 45000 newtons and going at 15 meters per second. The other car is 9000 newtons and going at 25 meters per second. How would I calculate velocity from this.

*February 4, 2013*

**math**

how many combinations can you get with 18 flavors of ice cream and 70 toppings?

*February 2, 2013*

**math**

find two point the perpendicular bisector of line AB. verify your results by showing each point is equidistant from A and B. A(3,0) B (1,4)

*January 30, 2013*

**Johnson**

How do I record this transaction? Sold inventory on account for $500, cost of merchandise sold was $300. (Record the sale first and then the cost.)

*January 29, 2013*

**Biology**

In a lab experiment, we experimented with 1% glucose solution and Sorenson's solution to determine pH levels and whatnot; the other part of the lab was to determine which one, if either, was a buffering solution. According to the notes my instructor gave us, a buffers are ...

*January 28, 2013*

**Physics **

A ball on the end of a string is whirled around in a horizontal circle of radius 0.486 m. The plane of the circle is 1.83 m above the ground. The string breaks and the ball lands 2.39 m away from the point on the ground directly beneath the ball’s location when the string...

*January 28, 2013*

**Chem**

How can the concept of specific heat capacity of water be used to explain the heating and cooling patterns if the oceans and the climate on the planet?? Can someone please explain this to me it would really help a lot.

*January 27, 2013*

**Hiastory HURRY!!!!!!!!!!!!!!!!!!!!!!!**

The answer is A

*January 24, 2013*

**College Finite**

Assume that you have a total of 9 people on the committee: 2 black males, 1 black female, 1 white male, and 5 white females. Party rules require that at least one black and at least one female hold one of the three offices. In how many ways can the officers be chosen while ...

*January 23, 2013*

**College Finite**

108 is not correct. Thanks for trying tho Reiny!

*January 23, 2013*

**College Finite**

A student wants to buy 3 CDs, but assume that there are 3 CDs featuring the piano, 5 CDs featuring the trumpet, and 3 CDs featuring the saxophone. In how many ways can the selection be made if CD's featuring at least 2 different instruments are selected?

*January 23, 2013*

**chem**

what is the change in enthalpy for CH4(g) + 2O2(g)----->CO2(g)+2H20(I) CH4: -74.86 CO2: -393.5 H2O: -285.5 I got triangle H: 890KJ/Mol is that correct?

*January 22, 2013*

**math- plz hlp**

Thx u very much!

*January 20, 2013*

**math- plz hlp**

The denominator of a fraction is greater than its numerator by 9. If 7 is subtracted from both its numerator and denominator, the new fraction equals 2/3. What is the original fraction?

*January 20, 2013*

**Pre-cal**

A bicycle with 28-in.-diameter wheel is traveling at 15 mph. To the nearest whole number, how many revolutions does each wheel make per minute?

*January 17, 2013*

**English**

In the following sentence is there a direct object or a predicate adjective? Sometimes I feel nervous before a game.

*January 15, 2013*

**fractions greater than one.**

write the mixed number as an improper fraction

*January 14, 2013*

**Physics **

A satellite moves in a circular orbit around the Earth at a speed of 5.4 km/s. Determine the satellite’s altitude above the surface of the Earth. Assume the Earth is a homogeneous sphere of radius 6370 km and mass 5.98 × 10 24 kg. The value of the universal ...

*January 13, 2013*

**physics**

An athlete whirls a 6.6 kg hammer tied to the end of a 1.2 m chain in a horizontal circle. The hammer moves at the rate of 0.432 rev/s. What is the centripetal acceleration of the hammer? Assume his arm length is included in the length given for the chain. Answer in units of m...

*January 13, 2013*

**Physics **

According to the Guinness Book of World Records (1990 edition, p. 169), the highest rotary speed ever attained was 2010 m/s (4500 mph). The rotating rod was 15 cm (5.9 in) long. Assume the speed quoted is that of the end of the rod. What is the centripetal acceleration of the ...

*January 13, 2013*

**physics**

A 1.62 kg mass attached to a light string rotates on a horizontal, frictionless table. The radius of the circle is 0.986 m, and the string can support a mass of 32.5 kg before breaking. The acceleration of gravity is 9.8 m/s 2 . What maximum speed can the mass have before the ...

*January 13, 2013*

**7th grade Social Studies Ms. Sue please!**

1. organize information. 2. enough detail. 3. Earth's tilt and orbit 4. new landforms. 5. latitude. 6. polar. 7. birth rates and death rates. 8. They cannot find work. 9. subsistence farming. 10. city-state. 11. 1. organize information. 2. enough detail. 3. Earth's ...

*January 10, 2013*

**5 th grade math**

Gracie read 150 pages of a book.the book is 227 pages long. Which equation shows the amount she still needs to read to finish the story

*January 10, 2013*

**Chemistry 1**

We are working on molarity of a solution in my class, and I am a little stumped on how to set the problems up. Here is one question from my homework. How many grams of NaCl are needed to make 575mL of 1.5 M NaCl solution? Thank you in advance :)

*January 3, 2013*

**Physics**

We went over this in my physics class yesturday, and I understand most of the concepts of this section of the book, but the examples we were given confuse me. I can find no connection between the numbers of tangential speed and RPM. :(

*January 3, 2013*

**geometry**

Create a word problem about a real life situation involving perimeter and area of a composite shape. I don't know any real life situations involving perimeter and area of a composite shape. Need Help. Please Help.

*December 19, 2012*

**Physics**

A police car is at rest beside a road, looking for speeders. A car passes going at a constant speed of 30.0 m/s. The police car starts up 4 seconds later and accelerates at 2 m/s sq. until it reaches a speed of 40m. If the police car maintains this speed until it catches up ...

*December 18, 2012*

**Social Studies**

natural resources Yankee Zimbabwe I'm studying geography

*December 18, 2012*

**physics**

One strategy in a snowball ﬁght is to throw a snowball at a high angle over level ground. While your opponent is watching this ﬁrst snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the ﬁrst. Assume both ...

*December 16, 2012*

**Physics **

A football is thrown toward a receiver with an initial speed of 17.5 m/s at an angle of 35.2◦ above the horizontal. At that instant, the receiver is 16.7 m from the quarterback. The acceleration of gravity is 9.81 m/s^2 With what constant speed should the receiver run to...

*December 16, 2012*

**physics**

A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 9.4 m/s. Also, it has an acceleration in the direction parallel to the walls of 5.8 m/s^2 What will be its speed when it hits the opposing ...

*December 16, 2012*

**trigonometry**

4.if cotθ = -√15/7 , use the fundamental identities to find cosθ > 0 9.A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? (Round to the nearest ...

*December 13, 2012*

**math**

thank you! we just learned decimals to fractions and vice versa today so I thank you for your help and now I can solve the remainder of the problem myself. thank you!

*December 11, 2012*

**math**

what is 1 3/4 as decimal

*December 11, 2012*

**Chemistry**

Hi, i'm really desperate! could anyone please help me with this question, I'm stumped. 'A buffer is prepared by mixing a 100.omL of a 0.100 M NH3 solution with a 0.200M solution of NH4CL solution and making the total volume up to 1.000L of water. What is the volume...

*December 11, 2012*

**English**

Thanks. Danita is saving her old watch for when the new one stops. Dependent clause when the new one stops Modifies saving Adverb

*December 10, 2012*

**English**

Dependent clause after he reviewed the chapter Adverb it modifies when it was easier?

*December 10, 2012*

**English**

I promise I have! It is just not making any sense to me!

*December 10, 2012*

**English**

In the sentence the homework was easier for Tyrone after he received the chapter. Is the dependent clause was easier for Tyrone? Is that a noun since it is a predicate noun?

*December 10, 2012*

**math**

I'm not sure what the answer is, but I think I might know how you will be able to figure it out. Take the $.01 Mary got the first week and double it to get what she got the second week ($.02). Then multiply the $.02 by 2 to get what she got the third week ($.04) Progress- ...

*December 10, 2012*

**English**

You might combine bits of information, that you have so far with the context. Dependent Claus that you have so far. Adjective that describes information?

*December 10, 2012*

**English**

Thanks. How about this one. For example, since amorphous ends in ous, it is probably an adjective. Dependent Claus since amorphous ends in ous, Adverb?

*December 10, 2012*

**English**

In these two I am torn between adverb and noun. If all else fails, go to the dictionary. If you are familiar with the word metamorphosis, you might figure out the meaning of morph from that word. The top one noun? The bottom one adverb?

*December 10, 2012*

**English**

The subject of the word gives is the dependent Claus?

*December 10, 2012*

**English**

I am really not understanding this at all. How a word begins and ends often gives clues to its meaning. Dependent Claus how a word begins and ends. Adverb modifying what it gives?

*December 10, 2012*

**English**

In the sentence still what morph means remains the critical question. Is the dependent clause still what morph means? Is it an adverb describing the clause remains?

*December 10, 2012*

**English**

I have to underline the dependent clause and tell whether it is an adjective, adverb, or noun. Can you help me with the following. If you sit down with a novel and a dictionary, you can refer to the dictionary often. Still what morph means remains the critical question.

*December 10, 2012*

**Physics **

A plane is ﬂying horizontally with speed 152 m/s at a height 2110 m above the ground, when a package is dropped from the plane. The acceleration of gravity is 9.8 m/s 2 . Neglecting air resistance,A second package is thrown downward from the plane with a vertical speed ...

*December 9, 2012*

**physics**

A truck travels up a hill with a 10 ◦ incline. The truck has a constant speed of 21 m/s. What is the horizontal component of the truck’s velocity? Answer in units of m/s What is the vertical component of the truck’s velocity? Answer in units of m/s

*December 9, 2012*

**Physics**

A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the distant approaching whistle is 540 Hz; it drops to 470 Hz after ...

*December 7, 2012*

**physics**

Two pipes, equal in length, are each open at one end. Each has a fundamental frequency of 475 Hz at 297 K. In one pipe the air temperature is increased to 304 K. If the two pipes are sounded together, what beat frequency results?

*December 7, 2012*

**8th grade math**

1/3 for Seth. The ratio is 3:2:1

*December 7, 2012*

**spanish**

Can someone please proof-read what I have so far on my Spanish essay for finals? Here it is so far: Antes de ver al aeropuerto, es importante confirmer el vuelo. Haces la maleta con ropa para tus vacacion. Cuando llegas el areopuerto, recibes la tareta de embarque y ver a ...

*December 6, 2012*

**Economics**

The answer is D. It revolves around the family unit.

*December 6, 2012*

**General Chemistry I**

Never mind, I just found my error; I incorrectly converted between Torr and atm, I should've gotten 1.05 atm instead.

*December 3, 2012*

**General Chemistry I**

And according to this solution I have here the correct answer is b. 1,250 mL~

*December 3, 2012*

**General Chemistry I**

A sample of gas occupies a volume of 59.9 mL. As it expands, it does 126.2 J of work on its surroundings at a constant pressure of 798 torr. What is the final volume of the gas? a. 61.1 mL b. 1,250 mL c. 218 mL d. 1,490 mL e. None of the above I used the work function w = -P&#...

*December 3, 2012*

**General Chemistry I**

Thank you so much, this makes much more sense than what I was doing; I was dividing each amount by the number of moles of O, not Br, which explains why I was getting crazy numbers.

*December 3, 2012*

**General Chemistry I**

A sample of a compound containing only Br and O reacts with an excess of H2 to give 6.601 g of HBr and 3.919 g of H2O. What is the empirical formula of this compound? a. BrO b. BrO2 c. Br2O d. BrO3 e. None of the above I already know the answer is (e), but I am not entirely ...

*December 3, 2012*

**ap chemistry **

A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a substance with a molar mass of 59.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.5 . Calculate the enthalpy change, , for this reaction per mole of . Assume that the...

*December 3, 2012*

**Physics **

Use 5.98 × 10 24 kg as the mass of the Earth. A 2350 kg meteorite has a speed of 143 m/s just before colliding head-on with the Earth. Determine the recoil speed of the Earth. Answer in units of m/s

*December 2, 2012*

**Physics **

Note: Take East as the positive direction. A(n) 86 kg ﬁsherman jumps from a dock into a 131 kg rowboat at rest on the West side of the dock. If the velocity of the ﬁsherman is 5.2 m/s to the West as he leaves the dock, what is the ﬁnal velocity of the &#...

*December 2, 2012*

**physics**

A 67.3 kg ice skater moving to the right with a velocity of 2.52 m/s throws a 0.151 kg snowball to the right with a velocity of 33.7 m/s relative to the ground. What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and ...

*December 2, 2012*

**physics**

A 2.24 kg mass on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 4.45 N/m. The mass is displaced 3.06 m to the right from its equilibrium position and then released, which initiates simple harmonic motion. How many times ...

*December 2, 2012*

**Physics **

A 83.5 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 35.5 m behind the ship, at rest relative to the spaceship. The only way to return to the...

*December 2, 2012*

**Physics **

A baseball player uses a pitching machine to help him improve his batting average. He places the 43.4 kg machine on a frozen pond. The machine ﬁres a 0.0546 kg baseball horizontally at a speed of 44.8 m/s. What is the magnitude of the recoil velocity of the machine? ...

*December 2, 2012*

**Physics **

A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1 m, they both have the same 1. momentum. 2. inertia. 3. speed. 4. change in potential energy. 5. kinetic energy.

*December 2, 2012*

**Chemistry**

thanks!

*December 1, 2012*

**Chemistry**

Calculate delta H for this reaction: N2 + 3H2 --> 2NH3 I am given the bond dissociation energy for N-N (163 kJ/mol), H-H (436 kJ/mol), and N-H (391 kJ/mol) I can't seem to find a similar problem anywhere, they are all given 2 or 3 similar equations.

*December 1, 2012*

**physics HELP!**

The observed wave speed is 20.3 m/s when the suspended mass is m = 3.07 kg. What is the mass per unit length of the string? I keep calculating this out to be .5199 kg/m which i know is wrong! HELP!

*November 30, 2012*

**Into. Chemistry**

I'm trying to do this precipitation reaction problem, but I don't understand part of it. The question is: Does a precipitate form when aq. soultions of potassium nitrate (KNO3) and sodium iodide (NaI) are mixed? Then it lists the solutions for the two: KNO3(aq) --> ...

*November 30, 2012*

**Chemistry**

If saturated solution of barium chloride at 30 degree Celsius contains 150g water how much additional barium chloride can be dissolved by heating it to 60 degree Celsius? 30 degrees Celsius = 38.2 60 degrees Celsius = 46.6

*November 30, 2012*

**English**

In Romeo and Juliet, what is ironic about Lord Capulet's praise of Friar Lawrence in Act 4 Scene 2?

*November 29, 2012*

**us history**

Compara and contrast your modern immigrant to historical immigrants. Atleast 10 bullets on each section. (Historical Immigration, both, and Modern immigration)

*November 29, 2012*

**Physics**

Two different simple harmonic oscillators have the same natural frequency (f=5.60 Hz) when they are on the surface of the Earth. The first oscillator is a pendulum, the second is a vertical spring and mass. If both systems are moved to the surface of the moon (g=1.67 m/s2), ...

*November 28, 2012*

**Physics**

A 2.24 kg mass on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 4.45 N/m. The mass is displaced 3.06 m to the right from its equilibrium position and then released, which initiates simple harmonic motion. What is the ...

*November 28, 2012*

**science**

A 2.24 kg mass on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 4.45 N/m. The mass is displaced 3.06 m to the right from its equilibrium position and then released, which initiates simple harmonic motion. What is the ...

*November 28, 2012*

**physics**

A 53.6 kg circus performer bobs up and down at the end of a long elastic rope at a rate of once every 2.80 s. The elastic rope obeys Hooke's law. Find how much the rope is extended beyond its unloaded length when the performer hangs at rest. ** I think Im missing a step ...

*November 28, 2012*

**physics**

An archer pulls her bow string back 0.370 m by exerting a force that increases uniformly from zero to 225 N. What is the equivalent spring constant of the bow?

*November 28, 2012*

**math**

i don't know i asking you

*November 27, 2012*

**English**

What about this one. Seeing the old slides remind reminded me of the good times we had. The verbal is seeing and it is a gerund?

*November 27, 2012*

**English**

In the first sentence I think it is a noun but in the second sentence I think it is an adjective? Is that correct?

*November 27, 2012*

**English**

Baking is a major project for the holidays. Is the verbal baking? Is this a gerund or a participle and why? Baking in the oven, the bread smelled delicious. Is the verbal baking in the oven? Is this a gerund or a participle and why?

*November 27, 2012*