Tuesday

September 16, 2014

September 16, 2014

Total # Posts: 445

**Astronomy**

Calculate the amount of energy released if a total of 1.5 kg of hydrogen is fused into helium.
*October 24, 2013*

**history **

The transformation of the office of UN secretary-general from “chief clerk” to “international peacemaker” proves that a. the Security Council is not as powerful as it was meant to be. b. the General Assembly may also become more active someday. c. the ...
*October 15, 2013*

**psychology**

8 Suppose that you are dropping off at a large mall without money and merely wander around looking at stores and displays. Later, someone asks you were a particular store is located in the mall. The fact that you direct the person to the store indicates that ______________ has...
*October 15, 2013*

**Psychology**

8 Suppose that you are dropping off at a large mall without money and merely wander around looking at stores and displays. Later, someone asks you were a particular store is located in the mall. The fact that you direct the person to the store indicates that ______________ has...
*October 14, 2013*

**English**

I need help writing an english essay
*October 8, 2013*

**physics**

A projectile is launched straight up at 55.5 m/s from a height of 73.5 m, at the edge of a sheer cliff. The projectile falls, just missing the cliff and hitting the ground below.
*September 27, 2013*

**Chemistry**

hi im steven i posted this question, can anyone help me understand how to do this problem and explain it to me please. I'm not really like this unit and i'm stressing for the exam coming up. please and thank you
*August 19, 2013*

**math**

How many ordered pairs of integers solutions (x,y) are there to 2x^2+3xy+y^2+2x+y+18=0?
*August 14, 2013*

**Physics**

Certain transmission lines can be modeled as a long 3D circuit as shown in the figure below. Here, all the the wires have equal length and electrical resistance R=1 Ω. Determine the equivalent resistance in Ohms between the points A and B. Assume the transmission line to ...
*August 6, 2013*

**physics (please help elena)**

We will now examine how much time we need to stop a ship-engine-like cylinder. Suppose you take a rotating cylinder and let it roll to the right until it reaches a vertical wall. It then spins against the two walls as shown in the picture, slowly slowing down. How much time ...
*August 6, 2013*

**Physics**

Dust particles are trapped on a surface. There are two energy levels particles can be in: absorbed on a surface with zero energy, and wiggling with energy E=3/2kT. However, since the surface area is limited, not all particles can be in any state. There are 1000 particles and ...
*August 5, 2013*

**Physics**

Rotating cylinders are not just physical abstractions: for example, they can turn a flow of the air, thus creating lift as the airplane wings. Historically people have even used rotating cylinders to power ships (although with little efficiency). NASA wrote more about this ...
*August 5, 2013*

**math**

i mean f^(5)(x)=f(f(f(f(f(x))))).
*July 31, 2013*

**math**

Define the function f(x)=2x/(1−x^2). Find the number of distinct real solutions of the equation f^(5)(x)=x.
*July 31, 2013*

**math**

Determine how many 1000 digit numbers A have the following property: When any digit of A, aside from the first, is deleted to form a 999 digit number B, then B divides A.
*July 31, 2013*

**physics**

A U.S quarter is rolling on the floor without slipping in such a way that it describes a circular path of radius R=4 cm. The plane of the coin is tilted at an angle of θ=45∘ with respect to the horizontal plane (see the figure below). Find the coin's period T in...
*July 30, 2013*

**Physics**

A wire is bent into the shape of an planar Archimedean spiral which in polar coordinates is described by the equation r=bθ. The spiral has N=100 turns and outer radius R=10 cm (R is the distance from point O to point T). Note that in the figure below we show a spiral ...
*July 29, 2013*

**physics**

Yeah it is !
*July 29, 2013*

**physics**

Our muscles atrophy when there is no gravitational force. On long space flights this is a problem, which is why astronauts exercise. On very long space flights it might be advisable to simulate gravity. Your space ship is a long cylinder of radius 100 m that spins about its ...
*July 29, 2013*

**Data Structures and Algorithms**

how can i give the link ??
*July 24, 2013*

**Data Structures and Algorithms**

Given integers R,M with M≠0, let S(R,M) denote the smallest positive integer x satisfying the congruence Rx≡1(mod M) if such an x exists. If such an x does not exist, put S(R,M)=0. Each line of this text file contains a pair of space separated integers representing...
*July 24, 2013*

**physics**

so whats the correct answer?
*July 23, 2013*

**physics**

no no your correct but correct answer will bet putting h-3 in place of h..
*July 23, 2013*

**physics**

i think we will get from your way damon h be about 15.68 which is wrong..
*July 23, 2013*

**physics**

A bungee jumper jumps from a bridge with a 3 m long bungee cord. Once the cord starts to stretch, it acts like an ideal spring with coefficient of elasticity k=100 N/m. What should be the minimum height of the bridge in m so that this jump is safe for the jumper? Details and ...
*July 23, 2013*

**physics**

You prefer soft-boiled to hard-boiled eggs, but you hate waiting next to your eggs to check if they're cooked. Therefore, you want to determine how often do you need to check the eggs so that they're not overcooked. What time does it take in minutes for a soft-boiled ...
*July 22, 2013*

**physics**

i researched online and it says J/kgK is the same as J/kgC so im gunna try just using 15 as the temperature, tell me what u get?
*July 22, 2013*

**physics**

i got 33.8 minutes im not sure what im doing wrong :/
*July 22, 2013*

**physics**

You prefer soft-boiled to hard-boiled eggs, but you hate waiting next to your eggs to check if they're cooked. Therefore, you want to determine how often do you need to check the eggs so that they're not overcooked. What time does it take in minutes for a soft-boiled ...
*July 22, 2013*

**physics**

You prefer soft-boiled to hard-boiled eggs, but you hate waiting next to your eggs to check if they're cooked. Therefore, you want to determine how often do you need to check the eggs so that they're not overcooked. What time does it take in minutes for a soft-boiled ...
*July 22, 2013*

**Math**

George studied 1/4 hour on Monday and 3/8 hour on Tuesday. How long did he study altogether on both days?
*June 18, 2013*

**math**

How Many years will it take to grow $321 to a value of 450.22 at a compounded rate of 12 percent
*June 17, 2013*

**Math**

What is the present value of $803 to be received 18 years from now at 10% discount rate.
*June 17, 2013*

**physics**

true
*June 12, 2013*

**physics**

True or false. Electric energy is transferred from generating stations to consumers' premises at extremely low voltage?
*June 12, 2013*

**Calculus**

I'm trying to find the radius of convergence for $(x-2)^n/(2x+1) I did the ratio test and ended up with: absolute value[(x-2)/(2x+1)]<1 How would I solve for the inequality at this point?
*June 7, 2013*

**math calculus**

Find the equation of the function f whose graph passes through the given point. (Remember to use ln |u| where appropriate.) f'(x) = x^3 − 4x^2 + 3/ x − 3 ; (4, −5) f(x) =
*May 28, 2013*

**math calculus**

Find the equation of the function f whose graph passes through the point (0, 4/3) and whose derivative is f'(x) = x sqrt 16 − x^2 . f(x) =
*May 28, 2013*

**math calculus**

The marginal cost of a product is modeled by dC/dx= 16/cube root 16x + 3 where x is the number of units. When x = 17, C = 120. (a) Find the cost function. (Round your constant term to two decimal places.) c= (b) Find the cost of producing 90 units. (Round your answer to two ...
*May 28, 2013*

**Calculus**

The linearization at a=0 to sqrt(1+6x) is A+Bx where A is: ____ and where B is : ______
*May 24, 2013*

**math calculus (please help me)**

Solve for t. (Round your answer to two decimal places. (2 − (2.479/35))^7t= 29
*May 20, 2013*

**Geometry**

Given the sets A={2,15,21,5,13} and B={6,9,15,12,21} , what is the sum of all the elements in A¾B ?
*May 16, 2013*

**Geometry**

The three interior angles in a triangle are x ∘ , (2x+24) ∘ and (3x+48) ∘ . What is the value of x ?
*May 16, 2013*

**Physics**

I got to, mv^2/r = mew(mg) that's it...... idk how im supposed to solve all those unknowns....
*May 6, 2013*

**math**

that is such a mission though lol, is that the only way?
*April 29, 2013*

**Combinations and Permutations, Steve and Ms. Sue☺**

i mean 8 not a
*April 10, 2013*

**Combinations and Permutations, Steve and Ms. Sue☺**

the answer for number 2- is b and a b 1140
*April 10, 2013*

**Statistics **

DM Co. sells computer parts by mail. The company claims that at least 90% of all orders are delivered on time. A sample of 150 orders showed that 129 were mailed on time. Is the company’s claim true? Test using the 2.5% level of significance. Use the 5 step procedure.
*March 28, 2013*

**Statistics **

A hospital claims that the mean waiting time at its emergency room is 25 minutes. A random sample of 16 patients produced a mean wait time of 27.5 minutes with a standard deviation of 4.8 minutes. Use the 1% level of significance to test is the wait time is different from 25 ...
*March 28, 2013*

**Algebra**

As x ranges over all real values, what is the minimum value of f(x)=|x-123|+|x-456| + |x-789| ?
*March 27, 2013*

**algebra**

Find the sum of all positive integers b such that b^2=a^3+1, where a is a prime number.
*March 27, 2013*

**Algebra**

If a, b and c are non-zero reals such that a + b + c = 11 and \frac {1}{a} + \frac {1}{b} +\frac {1}{c} = 0, what is the value of a^2 + b^2 + c^2?
*March 27, 2013*

**Calculus**

The volume of the 3-dimensional structure formed by rotating the circle x^2 + (y-5)^2 = 1 around the x-axis can be expressed as V = a\pi^2. What is the value of a?
*March 26, 2013*

**Trigonometry**

If \cot \left(\sin^{-1} \frac{1}{5}\right) = m, what is the value of m^2?
*March 26, 2013*

**home work**

The ball is throw in to the air . If its height in feet is given by - 16t^2 + 64t, at what time t will the ball reach a height of 64 feet?
*March 25, 2013*

**Statistics **

A company that manufactures exercise machines wanted to know the percentage of large companies that provides on-site health club facilities. A sample of 240 such companies showed that 96 of them provide such facilities on site. a. What is the point estimate of the percentage ...
*March 10, 2013*

**Statistics **

A company that manufactures exercise machines wanted to know the percentage of large companies that provides on-site health club facilities. A sample of 240 such companies showed that 96 of them provide such facilities on site. a. What is the point estimate of the percentage ...
*March 4, 2013*

**geometry **

38ft rope extended to end gives 70°angle of elevation what is height
*March 3, 2013*

**Statistics**

Suppose that 7.6% of all people are allergic to the H1N1 vaccine. A sample of 517 people are selected a. Calculate the probability that less than 8% of the sample will be allergic to vaccine.
*March 3, 2013*

**business**

$72,000
*March 1, 2013*

**Statistics**

Cola Corporation produces Orange Cola. The filling machines are adjusted to pour 12 ounces of soda into each 12-ounce can. However, the actual amount of soda poured into each can is not exactly 12 ounces; it varies from can to can. It has been observed that the net amount of ...
*February 19, 2013*

**Statistics**

Cola Corporation produces Orange Cola. The filling machines are adjusted to pour 12 ounces of soda into each 12-ounce can. However, the actual amount of soda poured into each can is not exactly 12 ounces; it varies from can to can. It has been observed that the net amount of ...
*February 19, 2013*

**Statistics **

Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a. What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b. ...
*February 11, 2013*

**Statistics **

Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a.What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b.What...
*February 11, 2013*

**Statistics **

Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a.What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b.What...
*February 11, 2013*

**algebra**

Can someone please help me solve (2f^2 g^3) ----------- 4 (3fg) posed to be a fraction bar with the four on the outside of the ()
*February 10, 2013*

**Algeba - Math**

A truck rental company offers two plans. One rental plan is $78 per day and $.12 per mile driven. Te other truck plan offers no daily fee but it is $.36 per mile driven. Determine the number of miles that must be driven in one day for the cost to be the same.
*February 7, 2013*

**Statistics-Probability**

An instructor will choose 3 problems from a set of 7 containing 3 hard and 4 easy problems. If the selection is made at random, what is the probability that only the hard problems are chosen?
*February 5, 2013*

**math**

Write it out
*January 10, 2013*

**Physics**

A 25.2-kg object is moving rightward across a horizontal surface with a speed of 14.3 m/s The coefficient of friction between the object and the surface is 0.490.
*January 10, 2013*

**Math**

68/4= 17 (one side of square) area of square is the side^2 Answer:289 cm^2
*January 10, 2013*

**Math**

plug 3 in for y 4x+2(3)=22 4x+6 =22 -6 -6 4x =16 ----------- 4 4 x = 4 Final Answer D; x=4 hope this helped
*January 10, 2013*

**Math**

you need to plug the x value in the coordinate in to see if you get the coresponding y value Answer is A becuse: 3(0)-1 = -1 3(2)-1 = 5 3(5)-1 = 14
*January 10, 2013*

**Math**

.3048 * 2 = .6096m/min then multiply by 60 to get into hours Final Answer: 36.576 meters/hour
*January 10, 2013*

**math algebra 1**

divide everything by 6 , 3 min 6 seconds
*January 10, 2013*

**Geometry PLEASE HELP ME**

ABC has vertices A(0, 6), B(4, 6), and C(1, 3). Sketch a graph of ABC and use it to find the orthocenter of ABC. Then list the steps you took to find the orthocenter, including any necessary points or slopes you had to derive.
*December 11, 2012*

**Geometry PLEASE HELP ME**

What is the range of possible values for x? The diagram is not to scale. Quadrilateral ABCD with diagonal from vertex B to vertex D. Sides AB and BC are congruent. Side AD is 22 units. Side DC is 30 units. The measure of angle ABD is given by 2x. The measure of DBC is 34 ...
*December 11, 2012*

**French**

Bonjour, Voici la réponse à tes questions 1) un ventillateur 2) le maillot de bain 3) un "dessus de lit" chaud 4) dans la bibliothèque 5) Dans l'armoire 6) des rideaux 7) Dans la salle de bain, dessus le lavabo 8) une gazinière
*December 4, 2012*

**Math (Calculus)**

At 2:00 pm boat K is 25 km north of boat L. If boat K is sailing 5 km/h west and boat L is sailing north at 20 km/h, what is the rate at which the distance between the two boats in changing at 2:30?
*November 4, 2012*

**Calculus**

f(x)=(1/3)x–4 on the interval [2,9]. The domain of the inverse function is the interval [A,B] where A=? and B=?
*November 1, 2012*

**accounting**

The monetary contributions that the owners of IBM pay for shares of the company's stock are ____ resources for IBM. a. material b. financial c. human d. informational e. manufacturing Patents and copyrights confer value on a firm but do not exist physically. Thus, they are...
*October 29, 2012*

**Math**

There are 285 7 th graders there are 19 more girls than boys what are the totals for each
*October 28, 2012*

**Math Calculus 2**

At a certain instant an aircraft flying due east at 240 miles per hour passes directly over a car traveling due southeast at 60 miles per hour on a straight, level road. If the aircraft is flying at an altitude of .5mile, how fast is the distance between the aircraft and the ...
*October 22, 2012*

**Chemistry**

In an exothermic reaction, is the heat of the reation less than, greater than, or equal to zero? In an endothermic reaction, is the heat of reaction less than, greater than, or equal to zero?
*October 16, 2012*

**Algebra**

If you drive for 2 hours at 80 mph, how fast must you drive during the next hour in order to have an average speed of 75 mph?
*October 8, 2012*

**Algebra**

A farm stand owner mixes apple juice and cranberry juice. How much should he charge if he mixes 8 L of apple juice selling for .45/L with 10 L of cranberry juice selling for $1.08/L?
*October 8, 2012*

**Algebra**

A chemist has 40 ml of a solution that is 50% acid. How much water should be added to make a solution that is 10% acid?
*October 8, 2012*

**Math**

A large company has a private computer network connecting 300 different sites. Each site is connected to the network independently with a switch that fails with probability 1% on any given day. 1. What is the probability that exactly two of 300 sites lose their network ...
*October 1, 2012*

**chemistry**

Prepare 1.5 liters of 0.25 M Tris buffer, pH 7.5. Useful information: pKa Tris = 8.1 Formula weight of Tris (hydroxymethyl aminomethane) base = 121.1 Formula weight of Tris hydrochloride (acid form) = 158.0
*September 26, 2012*

**chemistry**

first task is to prepare 250 ml of 3 M glucose. Then You are preparing a solution and the recipe calls for 25 ml of 10% glucose. How much of the 3M glucose stock would you need to add to so that you are adding the same molar amount of glucose?
*September 25, 2012*

**chemistry**

Prepare 150 ml of a reaction buffer containing 0.75% MgCl2, 35mM glucose, 750 nM ATP, and 20 mM Tris-Cl, pH 7.5. In addition, you have a 20% MgCl2 stock solution and the lab freezer has 10 mM ATP that you can dilute to the correct concentration.
*September 25, 2012*

**chemistry**

How would you prepare 500 ml of a 1.8 M phosphate buffer (pH 6.8) containing 4.5 x 10-6 M CaCl2 and 52 mM sucrose?
*September 25, 2012*

**math investment**

8. (TCO A) You can tax shelter only one-half of your retirement savings. You want to invest one-half of your savings in bonds and one-half in stocks. How much of the bonds and how much of the stocks should you allocate to the tax sheltered investment? (Points : 5) ...
*August 9, 2012*

**math**

3. (TCO A) The following questions are worth 5 points each. Please show all work. a. Inflation is expected to average five percent for the long term and Mr. Smith earned $74,000 this year, how much must he earn in 20 years just to keep up with inflation and maintain the ...
*August 5, 2012*

**math**

Joe is purchasing a new truck for $30,000. Joe is making a $2,000 down payment, and he will make 60 monthly payments of $541 each. What are the total finance costs on this loan?
*August 5, 2012*

**math**

Leslie has been offered the choice of either a $1,000 rebate or a 5.5 percent, 48-month loan for the new car she is purchasing. If Leslie will be financing $15,000 and she can get a 7.5 percent, 48-month loan at her credit union, should she take the $1,000 rebate or the 5.5 ...
*August 5, 2012*

**Accounting**

If a client asks me to do a balance sheet for a given month, but they put a question mark beside Truck and Accounts Payable in the assests column..can I even do the balance sheet since these are part of the assests?
*July 1, 2012*

**algebra**

A company produces doll houses and sets of doll furniture. The doll houses take 3 hours of labor to produce, and the furniture sets take 8 hours. The labor available is limited to 400 hours per week, and the total production capacity is 100 items per week. Existing orders ...
*June 20, 2012*

**algebra**

The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 28 in., find the width of the rectangle.
*June 20, 2012*

**algebra**

Adult tickets for a play cost $16 and child tickets cost $6. If there were 25 people at a performance and the theater collected $260 from ticket sales, how many adults and how many children attended the play?
*June 20, 2012*

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