Thursday

August 21, 2014

August 21, 2014

Total # Posts: 2,146

**physics**

A toy rocket, launched from the ground, rises vertically with an acceleration of 32 m/s^2 for 4.1 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve? The acceleration of gravity is 9.8 m/s^2. Answer in units ...
*August 17, 2014*

**math**

2 times{(300-90 divided by 5)-[3 times 26-(8-2 times 3
*August 16, 2014*

**math**

Thanks. Thats what I thought.
*August 13, 2014*

**math**

If A is 25% more than B, the B is ? less than A. A. 10% B. 15% C. 20% D. 25%
*August 13, 2014*

**physics**

an object moving on the x axis with a constant acceleration increases its x coordinate by 108 m in a time of 9.5 s and has a velocity of 20 m/s at the end of this time. Determine the acceleration of the object during this motion?
*August 10, 2014*

**Physics**

A train is moving parallel and adjacent to a highway with a constant speed of 28 m/s. Initially a car is 29 m behind the train, traveling in the same direction as the train at 42 m/s and accelerating at 3 m/s^2. What is the speed of the car just as it passes the train?
*August 8, 2014*

**College math**

Express the following in terms of Sum(or differnece) of logarithm's: log sub-b T^5 W^2 Z
*August 2, 2014*

**College math**

Convert to an exponential equation: -In45=3.80666249 and -Log sub.B T^5=W
*August 2, 2014*

**math**

Four students at a computer fair competed against each other in a space-travel game. Chris scored 2/3 as many points as the winner Pat. Rich scored 1/2 as many points as Chris. Tome scored 100 points, which was 90 points less than Rich's score. How many points did Pat score?
*August 1, 2014*

**math**

How many cubic yards of concrete are needed to make 1200 square concrete posts 9 inches by 9 inches by 6 feet?
*August 1, 2014*

**math**

Lisa can make a costume twice as fast Justin can. If they both work together, they can make it in 8 hours. How long will it take Mary to make the costume if he works alone?
*July 30, 2014*

**math**

Sam had a total of 80 foreign stamps and local stamps combined. After giving away 1/3 of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?
*July 30, 2014*

**math**

Sue left her home at 6 A.M. driving her car at the rate of 50 miles per hour. At 8 A.M. her brother Kevin drove after her along the same highway, traveling at the rate of 60 miles per hour, in how many hours did Kevin pass Sue.
*July 29, 2014*

**College Algebra**

Hello Damon, thanks a lot. But it says incorrect.
*July 25, 2014*

**College Algebra**

Hello Bobpursley, it still didn't work. it says wrong answer. Thanks
*July 25, 2014*

**College Algebra**

Hello Steve, it didn't work for "t" i can't get the actual value... Find the time required for an investment of 1 dollars to grow to 7200 dollars at an interest rate of 7.5 percent per year, compounded quarterly
*July 25, 2014*

**College Algebra**

1.Give a quadratic function q(x) with a vertex of (-1, 2). 2. Give a function h(x) which does not have an inverse function. 3. Give a polynomial function g(x) with zeros 1,2,3 4. Give an exponential function s(x) passing through (0,2) and (4,1). 5. Give a rational function R(x...
*July 25, 2014*

**College Algebra**

Find the time required for an investment of 1 dollars to grow to 7200 dollars at an interest rate of 7.5 percent per year, compounded quarterly
*July 25, 2014*

**math**

For the following pair of functions, f(x)-x+2, g(x)-√x-1 find each of the following and state its domain: a.) find (f+g)(x) b.)find (f-g) (x) c.) find (fg)(x) d.) find (ff)(x) e.)Find (f/g)(x)
*July 21, 2014*

**Calc**

Find the absolute maximum and minimum values of each function on the given interval. f(x)=x(e^-x)
*July 17, 2014*

**Work Ethic**

How do I work efficiently without getting distracted?
*July 16, 2014*

**history ,geographic, maths literacy and business studies**

what can I do after matric with these subjects
*July 3, 2014*

**Chemistry**

A student synthesized 6.895 g of barium iodate monohydrate, Ba(IO3)2*H2O by adding 30.00 mL of 5.912 x 10-1 M barium nitrate, Ba(NO3)2, to 50.00 mL of 9.004 x 10-1 M sodium Iodate, NaIO3 whats the percent yield?
*June 30, 2014*

**statistics**

2. A researcher measures the heart rate in a population of runners and finds they have an average heart rate of µ = 50, σ = 5. You do not need to show a graph, only computation work. 2A. Based on the average heart rate cited above, what proportion would we expect to...
*June 27, 2014*

**physics**

as Sue runs, her knee joint passes through the following vertical positions (meters): Frame 1: .043 Frame 2: .145 Frame 3: .21 Frame 4: .39 Frame 5: .415 The data were collected at a frequency of 100 Hz. What was the vertical velocity of her knee joint at the 2nd time point?
*June 15, 2014*

**english**

6.read the following line from poes "The Raven" "Doubting, dreaming dreams no mortal ever dared to dream before" Which poetic device does poe use in this line? a. alliteration b. metaphor c. personification d. simile
*June 12, 2014*

**Math**

If a vehicle travels 1320 feet in seven seconds from a dead stop , how long does it take for that same vehicle to travel 1313 feet from a dead stop ?
*May 26, 2014*

**Language Arts**

2.2 3.3
*May 23, 2014*

**Language Arts**

1. Electric lighting was a novelty before it became (1 point) unusual. common.* expensive. 2. Read the following paragraph from “The Electric Summer”: "That thrilled me, and scared me. The great world seemed to swing wide like the gates of the Fair, and I didn&#...
*May 23, 2014*

**Anthropology!!!**

What is the function or purpose of kinship systems, particularly descent groups and terminology naming practices? Why is the study of kinship in general so important to the study of anthropology? (what is the relationship?) the only part that I am confused is the terminology ...
*May 12, 2014*

**Anthropology!!!**

What aspects do anthropologists look at when they study political systems? Describe the types of societies, as well as the role of power and social control. I have no idea about what this question is asking Help me please Thank you
*May 12, 2014*

**English Help Please!!!**

In a Forbes magazine article from October 2013 Susan Adams wrote of a survey done by the National Association of Colleges and Employers from Bethlehem, Pa. From early August to mid-September that year they asked 200 hiring managers what skills they prioritize when they hire ...
*May 10, 2014*

**Anthropology!!!**

Can you explain this question for me so I can start writing? Or give me some examples to start? Thank you!
*May 9, 2014*

**Anthropology!!!**

Discuss the mechanisms of culture change. How can anthropology help one maintain a balanced perspective in a changing world?
*May 9, 2014*

**Math**

The teacher gave this pattern to the class: the first term is 5 and the rule is add 4, subtract 1. Each student says one number. The first student says 5. Victor is tenth in line. What number should Victor say?
*May 7, 2014*

**Math**

A carpenter has several boards of equal length. he cuts 3/5 of each board. After cutting the boards, the carpenter notices that he has enough pieces left over to make up the same length as 4 of the original boards. How many boards did the carpenter start with?
*May 7, 2014*

**math**

Chad buys peanuts in 2 pound bags. He repackages them into bags that hold 5/6 pound of peanuts. How many 2 pound bags of peanuts should Chad buy so that he can fill the 5/6 pound bags without having any peanuts left over?
*May 7, 2014*

**Chemistry**

The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.187 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.5°C, what is the minimum temperature reached by the solution? [specific heat of water = 4.18 J/g°C; heat capacity of the ...
*May 5, 2014*

**Chemistry**

Okay. Thanks for clarifying the problem for me.
*May 5, 2014*

**Chemistry**

Do I already know the final temp of the nickel because I don't know where to start even though you have given me the equation.
*May 5, 2014*

**Chemistry**

Would I have to rearrange the equation to solve for the final temp of the water?
*May 5, 2014*

**Chemistry**

A 271-g sample of nickel at 94.1°C is placed in 100.0 mL of water (density = 1.00 g/mL) at 23.9°C. What is the final temperature of the water? [Assume that no heat is lost to or gained from the surroundings. Specific heat capacity of nickel = 0.444 J/(g·K) and ...
*May 5, 2014*

**Chemistry**

Given the thermochemical equation 2SO2 + O2 → 2SO3, ΔH°rxn = -198 kJ/mol, what is the standard enthalpy change for the decomposition of one mole of SO3?
*May 5, 2014*

**Chemistry**

Given 2Al(s) + 3/2O2(g) → Al2O3(s), ΔH°f = -1,670 kJ/mol for Al2O3 (s). Determine ΔH° for the reaction 2Al2O3(s) → 4Al(s) + 3O2(g).
*May 5, 2014*

**Chemistry**

A piece of copper metal is initially at 100.0°C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20.0°C. After stirring, the final temperature of both copper and water is 25.0°C. Assuming no heat losses, and that the ...
*May 5, 2014*

**Chemistry**

A system initially has an internal energy U of 493 J. It undergoes a process during which it releases 107 J of heat energy to the surroundings, and does work of 225 J. What is the final energy of the system, in J?
*May 5, 2014*

**Chemistry**

Calculate the enthalpy change for the reactions NO(g) + O(g) → NO2(g) from the following data: NO(g) + O3(g) → NO2(g) + O2(g) ΔH = -198.9 kJ O3(g) → 1.5O2(g) ΔH = -142.3 kJ O2(g) → 2O(g) ΔH = 495.0 kJ Put the answer in kJ.
*May 5, 2014*

**Chem Check Please!!!**

1) Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10^-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2 e– -> ...
*May 3, 2014*

**Chem Check Please!!!**

1) Assuming the following reaction proceeds in the forward direction, 3 Sn4+(aq) + 2 Cr(s) ---> 3 Sn2+(aq) + 2 Cr3+(aq) a.Sn4+(aq) is the reducing agent and Cr(s) is the oxidizing agent. b.Cr(s) is the reducing agent and Sn2+(aq) is the oxidizing agent. c.Sn4+(aq) is the ...
*May 2, 2014*

**math**

find the bank discount and proceeds on the following loans RM4215 FROM 10 june to 5 august of the same year at 10 percent
*May 2, 2014*

**Calculus Help and Check**

find the derivative of the function integral from cosx to sinx (ln(8+3v)dv) y'(x)= (sin(8+3((sin(x)))+x)+sin(8+3sin(x)-x))/2 Is this the right answer?????
*May 1, 2014*

**calculus help**

y'(x)= (sin(8+3((sin(x)))+x)+sin(8+3sin(x)-x))/2 Is this the right answer?????
*May 1, 2014*

**calculus help**

find the derivative of the function integral from cosx to sinx (ln(8+3v)dv)
*May 1, 2014*

**math**

A regular hexagon is drawn inside of a circle so that each of its vertices touches the circle. The diameter of the circle is 4 centimeters and the perimeter of the hexagon is 12 centimeters. How much longer is the circumference of the circle than the perimeter of the hexagon...
*April 30, 2014*

**Math**

Two dice are rolled what are the odds of getting a smaller number on the second roll? P ( same number or sum greater than 8)
*April 29, 2014*

**Chemistry **

A system which undergoes an adiabatic change (i.e., q = 0) and has work done on it by the surroundings has a. w < 0, ΔU = 0 b. w < 0, ΔU < 0 c. w > 0, ΔU < 0 d. w > 0, ΔU > 0 e. w < 0, ΔU > 0
*April 28, 2014*

**calculus help**

Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost $3 a yard, but she needs to use special fencing, which costs $5 a yard, on ...
*April 25, 2014*

**Calculus Help **

Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost $3 a yard, but she needs to use special fencing, which will minimize the ...
*April 24, 2014*

**Math**

Question is misleading. Group A ate 1 pizza. Group B ate 1 pizza + 2 slices. Group B ate more pizza. Group C would have ate 4/6 if they ate the rest of the pizza. This we can only assume because they did not provide enough information.
*April 24, 2014*

**Math ~ Check Answers ~**

You go to CCA! Cheater
*April 23, 2014*

**Math**

It's B! ;)
*April 17, 2014*

**Math**

Simplify 15C3 A. 182 B. 455 C. 2,730 D. 910
*April 17, 2014*

**Math**

13. A true or false test has 8 questions. What is the probability of guessing the correct answers to all the questions? A. 1/10 B. 1/16 C. 1/64 D. 1/256
*April 17, 2014*

**Math**

Each of two urns contains green balls and red balls. Urn one contains 10 green balls and 8 red balls. Urn two contains 3 green balls and 10 red balls. If a ball is drawn from each urn, what is P(red and red)? A. 23/18 B. 10/27 C. 40/117 D. 18/31
*April 17, 2014*

**Math**

Thanks!
*April 17, 2014*

**Math**

Food Express is running a special promotion in which customers can win a free gallon of milk which their food purchase if there is a star on their receipt. So far, 147 of the first 156 customers have not received a star on their receipts. What is experimental probability of ...
*April 17, 2014*

**Steve please help!**

Thank you :)
*April 17, 2014*

**Steve please help!**

3. A number cube is rolled 160 times. The number 2 comes up 39 times. What is the experimental probability of rolling a 2? What is the theoretical probability of rolling a 2? A. 39/160; 1/80 B. 1/6; 39/160 C. 39/160; 1/6 D. 121/160; 1/6
*April 17, 2014*

**Probability**

1. You roll a number cube numbered one to six 12 times. P(5)=2/3. What type of probability is illustrated and why? A. Experimental; the result is based on the number of possible outcomes. B. Experimental; the result is found by repeating an experiment. C. Theoretical; the ...
*April 17, 2014*

**Educational Technology**

Got 'em all right ;)
*April 16, 2014*

**Educational Technology**

1. Which of the following choices is a strategy that could help with time management? A. Spending most of the day on leisure activities. B. Doing homework in every spare moment. C. Cutting back on sleep. D. Creating a list of tasks to be completed daily.* 2. What is a planner...
*April 16, 2014*

**Chemistry**

I did that but got 5.346 g as my answer. Is that correct?
*April 14, 2014*

**Chemistry**

What mass of lithium phosphate is needed to prepare 500.0 mL of a solution having a lithium ion concentration of 0.1385 M?
*April 14, 2014*

**Chemistry**

Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 4.69 g sample of vinegar was neutralized by 32.97 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?
*April 14, 2014*

**Chemistry**

What mass of hydrogen gas is produced when a 7.43 g chunk of zinc dissolves in 500.0 mL of 1.200M HCl?
*April 14, 2014*

**Chemistry**

A 4.379 g sample of MgCl2 is dissolved in enough water to give 750.0 mL of solution. What is the chloride ion concentration in this solution?
*April 14, 2014*

**Math**

A number cube with numbers 1 through 6 is rolled. Find the given probability. P(complement of 4) A. 1/6* B. 5/6 C. 2/6 D. 4/6
*April 8, 2014*

**Math**

A number cube with numbers 1 through 6 is rolled. Find the given probability. P(number¡Ý3) A. 4/6 B. 1/6 C. 2/6 D. 5/6*
*April 8, 2014*

**Math**

A number cube with numbers 1 through 6 is rolled. Find the given probability. P(number<2) A. 1/6* B. 2/6 C. 4/6 D. 3/6
*April 8, 2014*

**physics**

A lightning bolt may carry a current of 1.00 ✕ 104 A for a short time interval. What is the resulting magnetic field 134 m from the bolt? Assume that the bolt extends far above and below the point of observation.
*April 6, 2014*

**science(check answers)**

60 kg cheetah reaches a speed of 30 m/s when chasing its prey
*April 3, 2014*

**language arts **

6.Which of the following places events in chronological order? A.formation of Negro Leagues, invention of baseball, Civil War B.invention of baseball, Civil War, formation of Negro Leagues C.invention of baseball, formation of Negro Leagues, Civil War D.Civil War, invention of...
*March 28, 2014*

**5th Grade Math**

8 games
*March 27, 2014*

**5th Grade Math**

Keith played some games of chess at a tournament. He recorded the results of the games on the table shown. Game Results: Number of Games TIES 4 WINS 12 Losses 4 If Keith plays 10 more games, how many of the 10 games is he likely to win? A. 6 games B. 8 games C. 4 games D. 2 games
*March 27, 2014*

**Math**

-7x + 9y = -29 8x + 5y = -28
*March 22, 2014*

**Math **

solving applied problems two equations (Coles two student loans totaled $31,000. One of his loans was at 2.8% simple interest and the other at 4.5%. After one year, Cole owed $1024.40 in interest. What was the amount of each loan?)
*March 22, 2014*

**us history**

X( WHY DOESN'T ANYBODY FIX THE WRONG ANSWERS?!?!
*March 19, 2014*

**Math**

Sam spent half his money on a shirt. At another store he spent half the money he had left. Then he bought a cd for $6.75. He had $2.50 left. How much money did Sam have in the beginning?
*March 12, 2014*

**English**

Compare and contrast the elements of the Kelly-Frye and Daubert decisions. What do you think about each decision and how it pertains to the rules of evidence?
*March 9, 2014*

**physics**

A block of mass m = 2.7 kg is released from rest at a height of H = 0.49 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 515.0 N/m. What is the maximum compression of the spring, x? B)After the spring reaches its maximum ...
*March 5, 2014*

**Physics**

At the top of an inclined track, a spring is attached to a rod at one end and a dynamics cart at the other such that the spring stretches parallel to the track. The cart has a mass of .850kg and there is negligible friction between the cart and the track. The spring has a ...
*March 3, 2014*

**Physics**

A spring of unknown force constant is attached to a rod so that it hangs vertically. With no mass attached, the spring has a length of 12.0 cm. When a student attaches a mass of 50 grams, the spring stretches to a length of 18.0cm. Determine the force constant for this spring.
*March 3, 2014*

**physics**

A 25.5- kg block (m1) is on a horizontal surface, connected to a 5.7- kg block (m2) by a massless string as shown in the Figure. The pulley is massless and frictionless. A force of 239.3 acts on m1 at an angle of 32.1 . The coefficient of kinetic friction between m1 and the ...
*March 3, 2014*

**Algebra**

Sorry I submitted before finishing my input. Arrange the terms of the polynomial in ascending powers of b. 25db^5-7dm+3b^10-6db^6 Am I correct? Please help? My answer is: 25b^5d-7dm+3b^10-6b^6d=3b^10-6b^6d+25b^5d-7dm
*March 2, 2014*

**Algebra**

Arrange the terms of the polynomial in ascending powers of b. 25db^5-7dm+3b^10-6db^6 Please tell me if I am correct on my answer? I got: 25b
*March 2, 2014*

**math**

The Mills Lunch Shop prepares fresh take-out entrees each day. On Tuesday, 40 baked chicken dinners were prepared at a cost of $3.20 each. A 20% spoilage rate is anticipated. Mills Lunch Shop sells the dinners at an 80% markup based on cost. They decided to offer a $1.00-off ...
*March 2, 2014*

**Science**

Why do you think the human brain has more convolutions than a pig brain?
*March 1, 2014*

**Chemistry**

The value of KC for the interconversion of butane and isobutane is 2.5 at 25°C. If you place 0.067 mol of butane in a 0.250-L flask at 25°C and allow equilibrium to be established, what will be the concentrations of the two forms of butane? A)[butane] B)[isobutane]
*March 1, 2014*

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