Saturday

February 28, 2015

February 28, 2015

Total # Posts: 2,062

**Chemistry**

The molar mass of H2 is 2.02 grams 1.25/2.02 is the number of moles of H2 multiply the number of moles of H2 by Avogadro's number, and you have the number of molecules of H2 multiply the number of molecules of H2 by 2 and you have the number of atoms of H
*October 3, 2012*

**Physics**

First, make sure all units are compatible: Convert 15 minutes to hours, since the speeds are listed in km per hour. 15 minutes / 60 min/hr = .25 hours Set up algebra equations: Then let x be the distance traveled by the car that travels at 70 km/hr Let y be the distance ...
*October 3, 2012*

**thermodynamics**

P1 * V1 = P2 * V2 Where P1 and V1 are the initial pressure and volume, P2 and V2 are the final pressure and volume. 1 atm * 100 ft^3 = P2 * 1 ft ^3 P2 = 100 atm; use your book or the internet to find a conversion factor from atm to psi
*October 3, 2012*

**Math**

First you need to know what you are rounding off to -- the nearest ten, the nearest cent, the nearest 100? . . . Here's an example: 1558.23 Round 1558.23 to the nearest tenth: 1158.23 is between 1158.2 and 1158.3; it's closer to 1158.2, so 1158.23 rounded to the ...
*October 3, 2012*

**Science**

Overpopulation occurs when a population outstrips the available resources to provide a basic standard of living. Consumption overpopulation occurs when a population outstrips the available resources to provide a basic standard of living, plus an additional consumptive standard...
*October 3, 2012*

**Math**

There are 2 digits in the number of national parks, and this number is less than 30 Therefore, you know that the number of parks is between 10 and 30 Both digits are even. . .there are only a few numbers between 10 and 30 that have 2 even digits. They are 20, 22, 24, 26, 28 ...
*October 2, 2012*

**Physics**

Your question is missing some units 8.9 what? 8.9 miles per hour? 8.9 feet per second? To find the distance in inches that Larry runs you multiply average speed * time, but you first might have to do some conversions to make sure units are compatible. For example if Larry'...
*October 2, 2012*

**physics**

the net force acting on the boat is 2100 N - 1600 N = 500 N a) Force = mass * acceleration 500 N = 1200 * a Solve for a, the acceleration in m/s^2 b) distance = 1/2 * a * t^2 where t is time distance = 1/2 *a*40^2 Plug in the acceleration from (a) and solve for the distance in...
*October 2, 2012*

**Algebra II**

This will be factored into an expression of the form (A*a + B)(C*a + D) Multiplying out: A*C*a^2 + A*D*a + B*C*a + B*D = A*C*a^2 + (A*D + B*C)*a + B*D = 12a^2-17a-5 which means A*C = 12 A*D + B*C = -17 B*D =-5 Then start trying whole numbers. . .B and D have to be +/- 1 or +/-...
*October 2, 2012*

**Math**

1. Romeo, Juliet, _ _ _ _ 2. Juliet, Romeo, _ _ _ _ 3. _ Romeo, Juliet _ _ _ 4. _ Juliet, Romeo _ _ _ 5. _ _ Romeo, Juliet _ _ 6. _ _ Juliet, Romeo _ _ 7. _ _ _ Romeo, Juliet _ 8. _ _ _ Juliet, Romeo _ 9. _ _ _ _ Romeo, Juliet 10._ _ _ _ Juliet, Romeo There are 5*2 ...
*October 2, 2012*

**Math**

40^2 = 1600 50^2 = 2500 So his age has to be between 40 and 50 What number between 40 and 50 when squared is a number between 1800 and 1900? 43^2 = 1849 if he was 43 in the year 1849, then he was 0 (the age he was born) in ???
*October 2, 2012*

**Math**

Let c be the number of chocolate chip cookies, and b be the number of brownies. b + c = 11 0.4 * c + 0.5 *b = 5.10 Use algebra to solve for b and c
*October 2, 2012*

**physics**

E = k * q/r^2 The distances all have to be converted to meters because you want everything in SI units a) at x = 0, the field from the first charge is k * 8.71 / 0.03m^2 the field from the 2nd charge is k * -28.6 / 0.09m^2 So the total electric field is the sum of these ...
*October 2, 2012*

**Algebra**

0.18 * 240
*October 2, 2012*

**math**

24 + 23 + 22 + 21 + . . . + 2 + 1 = This is the sum of all the cards in the deck. This sum has to be evenly divided by the numbers of piles, so divide this number by 6, and that is your answer.
*October 2, 2012*

**Math**

The average after the next student took the test was (20*75 + x)/21 = 76 Solve for x
*October 2, 2012*

**physics**

The impulse delivered to the ball is the change in momentum The beginning momentum is the mass of the object multiplied by its initial speed (0.1 kg * 4.0 m/s) = .4 kg m/s The final momentum is the mass of the object multiplied by its final speed (0.1 kg * 3.8 m/s) = 0.38 kg m...
*October 2, 2012*

**Algebra**

To find the greatest common factor, first list the factors of both numbers, then find which one is the greatest shared factor. For example, to find the greatest common factor of 20 and 30: Factors of 20: 1, 2, 4, 5, 10, 20 Factors of 30: 1, 2, 3, 5, 6, 10, 15 The common ...
*October 2, 2012*

**physics**

This is like a right angled triangle with hypotenuse 86.4 and one side adjacent to the right angle 62.5. Use the pythagorean theorem: x^2 + 62.5^2 = 86.4^2 Solve for x.
*October 2, 2012*

**calculus**

y'> 0 on the intervals This means, for what range of x values is y' = 3x^2 - 3 positive, or in other words, for what range of x values is the graph of y' above the x axis y' < 0 This means for what range of x values is y'= 3x^2 -3 negative, or in ...
*October 2, 2012*

**science**

x = 1/2 a * t^2 v = a * t where x is distance, a is acceleration, t is time, and v is speed First you have to get the units to match. You probably want your answer of acceleration to be in ft/second^2, so convert 330 mph to ft/s 330 miles/hour = 330 miles / 3600 s = 0.0916 ...
*October 2, 2012*

**6th grade math**

square
*September 26, 2012*

**statistics**

80%
*September 26, 2012*

**Mathematics**

The association has $2000 in its reserve fund that it will use to help pay for repairs. How much must the association charge each of the 5o homeowners if the total cost for the repairs is $13,350?
*September 25, 2012*

**Mathematics**

Tito Sanchez receives a weekly salary of $400. he also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he is to make a total of $790?
*September 25, 2012*

**Chemistry H.**

Indium has two naturally occurring isotopes and an atomic mass of 114.818 amu. In- 113 has a mass of 112.904 amu and an abundance of 4.3%. What is the identity and percent abundance of indium's other isotope. I am very confused on how do I set up this conversion problem?
*September 23, 2012*

**Chemistry H.**

I don't understand how to set up the conversion problem.. Or what exactly it's asking
*September 23, 2012*

**Chemistry H.**

Assume that the nucleus of the fluorine atom is a sphere with a radius of 5 x 10 ^ -13 cm. Calculate the density of matter in the fluorine nucleus in grams/cm^3. Now convert your answer to tons per cubic centimeter, knowing that there are 454 grams in one pound.
*September 23, 2012*

**Physics**

Real life experience: I am not exceptional in math but I have managed to learn chemistry by using only a couple books and the internet. I spend hours on my smartphone with practice questions and homework questions that I've found on the net. I'm not even a student in a...
*September 18, 2012*

**Calculus Based Physics II**

An air-ﬁlled spherical capacitor is constructed with inner and outer shell radii of 6.4 cm and 16.1 cm, respectively. Calculate the capacitance of the device. The value of the Coulomb constant is 8.98755 × 10 9 N·m^2/C^2 Answer in units of pF
*September 15, 2012*

**math**

I would add 5 and 5 first because that equals 10, and its easy to add things to 10
*September 13, 2012*

**math**

equation d=55h the distance a person drives when traveling 55mph. (h=time in hours, d+ distance in miles.Use equation to complete the table.)
*September 13, 2012*

**Business Math**

How did you find $650?
*September 10, 2012*

**Pre-Algebra**

the sum of a number and 14.5
*September 8, 2012*

**Physics**

start the shopper at (0,0) After pushing the cart 50 m south, he's now at (0, -50) After turning west and pushing the cart 19 m, he's now at (-19, -50) Now he has to turn 90 degrees again. . . he will then be going either north or south. . . south will result in the ...
*September 4, 2012*

**Math Pre-Algebra**

5.2 (division sign) 1.25
*September 2, 2012*

**math Pre-Algebra**

5.2
*September 2, 2012*

**Math Pre-Algebra**

explain why 1 raised to any power is equal to 1
*September 2, 2012*

**pre cal**

(y^2)^-4y^8 simplify
*August 30, 2012*

**Math Pre-Algebra**

help!! does anyone know how to write an expression to represent the number of minutes in x hours
*August 30, 2012*

**English**

Thank you I looked at it and have changed the thesis to this. Since the first case of C.Diff in 1935, all the lives lost and money spent could all have been prevented. Does this sound better?
*August 29, 2012*

**English**

I am trying to write a thesis statement for a research paper I have to write. The paper is over C. Diff this is a disease. Here are my ideas I am just not sure that either are even written correctly. 1. Deaths caused by Cloustridium Difficiule are preventable. 2. Simple ...
*August 29, 2012*

**English**

have your ccake and eat it to.
*August 17, 2012*

**history**

The animating principles of Benedict's rules for monks are the quest for salvation and A. knowledge obtained solely through communion with God. B. the subordination of willfulness. C. extremes of self-mortification. D. the application of personal resistance to God's work.
*August 17, 2012*

**history**

so rice
*August 17, 2012*

**history**

A staple food transplanted from Southeast Asia to the Mediterranean world as a result of the Islamic Empire was a. rice b. wheat c. yams d. potatoes i think b
*August 17, 2012*

**History**

What group colonized many small islands in the Pacific Ocean? a. Japanese b. Chinese c. Koreans d. Polynesians
*August 17, 2012*

**math**

100
*August 17, 2012*

**reading**

cut the 2, 3, 4th pages in the sections but stop about 1/2 inch from the staples say this is your 2,3,4 page make your cuts here ___________________ * * ______*_____*______
*August 17, 2012*

**physic**

A dog sled weighing 750 lb is pulled over level snow at a uniform speed by a dog team exerting a force of 60 lb. Find the coefficient of friction.
*August 16, 2012*

**animal science**

so the answer would be B?
*August 15, 2012*

**animal science**

Which of the following is true of the function of glucagon? A. Glucagon regulates insulin secretion. B. Glucagon increases glycogen breakdown into glucose. C. Glucagon inhibits glycogen breakdown into gluclose. D. Glucagon regulates somatostatin secretion.
*August 15, 2012*

**chemistry**

Ethanol (C2H6O) is combusted with oxygen to produce carbon dioxide and wateraccording to the following reaction: C2H6O + 3O2 -----> 2H2O + 3CO2 If 50g of ethanol is combusted, determine the volume of carbon dioxide that will be produced if the temperature is 25oC and the ...
*August 3, 2012*

**Tech Math**

A 490 newton woman stands on a bathroom scale while riding in a elevator that is accelerating downward at 2m/sec/sec. Find her apparent weight and her apparent mass. Compare to her starting mass.
*July 19, 2012*

**Music**

4. -Pop Rock -Soft Rock -Hard Rock
*July 17, 2012*

**Physics (Angular Momentum)**

A solid ball of radius 10cm and mas 8kg rolls in the y direction with a speed of 10 m/s At the instant that it is 3m from the origin along the x axis, what is the angular momentum (mag + direction) about its center of mass?
*July 13, 2012*

**statistics**

An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.9 years of age. If the standard deviation is assumed to be 4.9 years, find the probability that a random sample of 33 U.S. women would show a mean age at ...
*July 7, 2012*

**statistics**

First graders who misbehave in school may be more likely to be regular smokers as young adults according to a new study presented in the July 2004 issue of the American Journal of Epidemiology. After following a group of U.S. first graders for 15 years, it was found that among...
*July 7, 2012*

**composition**

In Weeks 9 and 10, you will develop an essay using definition as the rhetorical strategy. This week, you will complete your essay. Review the criteria for a definition essay. Continue with the essay you started in Week 9. Expand your definition by including the word's ...
*June 23, 2012*

**Physics**

Three fixed charges are located along a line. The - 2 C charge is 10cm to the left of the +5 C charge and the -4 C charge at 4 cm to the right of the +5 C charge. a.what is the force exerted on the -4 C by the +5C charge? b.what is the force exerted on the -4 C by the -2 C ...
*June 21, 2012*

**Math**

A chain store manager has been told by the main office that daily profit, P is related to the number of clerks working that day, x, according to the equation P= -25x^2 + 300x. What number of clerks will maximize the profit, and what is the maximum possible profit?
*June 18, 2012*

**Math**

If a baseball is projected upward from ground level with an initial velocity of 64 feet per second, then its height is a function of time, give by g(t)= -16^2 + 64t. What is the maximum heigh reached by the ball?
*June 18, 2012*

**Physics Velocity Question**

The equation for the displacement in meters of an object moving in SHM is x(t) = 1.50 cos (4.20t) where t is in seconds. (a) What is the maximum speed of the object? (b) At what time does it first reach the maximum speed? I already got 6.3m/s for A and I got B wrong. I thought...
*June 15, 2012*

**PHYSICS**

A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0230 m deeper into the water. What is the weight of the rock?
*June 15, 2012*

**accounting**

The annual interest rate for a customer’s loan of $425 is 15.75%. What is the total dollar amount to be repaid on the loan, including principle and interest, for the entire year?
*May 31, 2012*

**Math**

A customer paid $247.13 in interest on a loan of $950.50. What is the percentage of interest paid?
*May 31, 2012*

**Mat 116**

What is the solution of the system 7r - 5s = 36 and 5r + 7s = 68
*May 30, 2012*

**physics**

The route followed by a hiker consists of three displacement vectors , , and . Vector is along a measured trail and is 1060 m in a direction 20.0 ° north of east. Vector is not along a measured trail, but the hiker uses a compass and knows that the direction is 35.0 ° ...
*May 29, 2012*

**Math**

you're setting sales goals for next month, you base your goals on previous avg sales. The actual sales for the same month for the last 4 yrs have been 24 units, 30 units, and 27 units, what is the avg number of units you can expect to sell next month
*May 27, 2012*

**waves and optics**

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
*May 27, 2012*

**physics**

does this work as the same phenomenon as the moon ???
*May 27, 2012*

**physics**

A planet orbits a star once every 3.14x10^7 s in a nearly circular orbit of radius 1.51x10^11 m. (a) With respect to the star, determine the angular speed of the planet b) With respect to the star, determine the tangential speed of the planet. c) With respect to the star, ...
*May 25, 2012*

**english**

I wrote an essay because i'm apply to get into the honor's program. I'm supposed to write about who i was, who i am now, and who I would like to be. I would appreciate it if I got some feed back along with grammar correction. Is my essay even close to being okay or...
*May 22, 2012*

**math**

Find a quadratic function in standard form that has 3-1/4i as a zero and also passes through the point (1,-70).
*May 21, 2012*

**math**

39+(-88) -29 - (-83)=
*May 21, 2012*

**physics**

An electron ( mass = 9.11×10−31 kg) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.85 cm away. It reaches the grid with a speed of 2.95×10^6 m/s . (You can ignore the ...
*May 19, 2012*

**Physics**

A 1.07 kg block slides across a horizontal surface directly toward a massless spring with spring constant 4,794 N/m. The surface is frictionless except for a rough patch of length 0.461 m that has coefficient of kinetic friction 0.358. The initial velocity of the block is 4.12...
*May 14, 2012*

**child care management**

A teaching method that uses computers to help children learn is called ?
*May 12, 2012*

**Math 117**

What is the lcm 6y^2 and 12y^9
*May 7, 2012*

**Math 117**

What is the lcm 6y^2 and 12y^9
*May 7, 2012*

**math**

A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
*May 6, 2012*

**math**

A government survey conducted to estimate the mean price of houses in a metropolitan area is designed to have a margin of error of $10,000. Pilot studies suggest that the population standard deviation is $70,000. Estimate the minimum sample size needed to estimate the ...
*May 6, 2012*

**math**

A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.
*May 6, 2012*

**Utech**

The 6th term of an A.P is twice the third and the first term is 3. Find the common difference and the 10th term.
*May 1, 2012*

**Utech**

The 9th term of an Arithmetic Progression is 8 and the 4th term is 20. Find the first term and the common difference.
*May 1, 2012*

**math**

3 bags of soil
*May 1, 2012*

**math**

Charlene is filling a box planter with soil.Each bag of soil contains enough to fill 500 cubic inches.If the base of the box planter is a 9-inch square and the sides are 18 inches tall,how many bags of soil will Charlene need?
*May 1, 2012*

**Statistics**

When fifteen vehicles were observed at random for their speeds (in M.P.H.) on a freeway, the following data were obtained. 61 53 57 55 62 58 60 54 62 60 59 66 55 54 63 Suppose that from past experience it may be assumed that vehicle speed is normally distributed with standard ...
*April 29, 2012*

**social studies**

anyone hello plzzzz!!!!!!!!! anyone out there plzzzz!!@!!!!!!!
*April 26, 2012*

**social studies**

plzzzzzzz!!!!!!!!!!!
*April 26, 2012*

**social studies**

i need help with homework plzzzzzzz!!!!!!!!!!!!
*April 26, 2012*

**Math**

For $1.80 a grocer buys a case of fruit which contains 12 dozen. She knows that tow dozen will spoil before she sells them. At what price per dozen must she sell the good ones to gain 1/3 of the whole cost?
*April 25, 2012*

**Math**

In printing an article of 30,000 words, aprinter decided to use two sized of type. Using the larger type, a printed page contains 1,200 words. Using the smaller type, a page contains 1,500 words. The article is allotted 22 pages in a magazine. How many pages must be in the ...
*April 25, 2012*

**Math**

Three individuals form a partnership and agree to divide the profits equally. X invests $4,500, Y invests $3,500 and Z invests $2,000. If the profits are $1,500, how much less does X receive than if the profits were divided in proportion to the amount invested?
*April 25, 2012*

**Math**

Our baseball team lost 9 games this season. This is 3/8 of all they played. How many games did they play this season?
*April 25, 2012*

**Math**

Answers for A clock was exactly on time at noon on Monday. At 2 P.M. on Wednesday, it was 25 seconds slow. At that same rate, how much did it lose in 1/2 hour?
*April 25, 2012*

**math**

62.85
*April 19, 2012*

**algebra**

the weight of a symetry ball varies directly with the cube of it's radius a ball with the radius of 2 inches weighs 5.60. find the weight of a ball with a 3 inch radius
*April 18, 2012*

**Networking**

A firm is assigned the network part 128.171. It selects a 10-bit subnet part. a)Draw the bits for the four octets of the IP address of the first host on the first subnet. b)Convert this answer into dotted decimal notation. c)Draw the bits for the second host on the third ...
*April 18, 2012*

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