Sunday

December 4, 2016
Total # Posts: 1,068

**Reactor Physics**

There is an infinite non-multiplying medium with diffusion length 3 cm and diffusion coefficient 1 cm. There are 3 point sources of neutrons on the x-y plane: „h Source S1 = 108 s-1 at (x, y) = (2 cm, 0) „h Source S2 = 2*108 s-1 at (x, y) = (0, 2 cm) „h Source ...

*November 3, 2014*

**Reactor Physics**

Design the smallest cubical uniform nuclear reactor which will have a fission rate at any point not greater than 2.1*1011 fissions.cm-3.s-1 and a fission power not smaller than 2,500 MW. [Neglect the extrapolation distance.]

*November 3, 2014*

**science (Need FAST FEEDBACK!!!)**

Is a density bottle the same as a pycnometer?

*October 26, 2014*

**physics**

A 2.44 kg object is subjected to three forces that give it an acceleration vector a = -(8.00 m/s2)i hat + (6.00 m/s2)j hat. If two of the three forces are vector F1 = (30.7 N)i hat + (17.0 N)j hat and vector F2 = -(12.0 N)i hat + (8.00 N)j hat, find the third force.

*October 19, 2014*

**physics**

How far from a piece of paper must you hold your father’s 2.00 D reading glasses to try to burn a hole in the paper with sunlight?

*October 18, 2014*

**Statistics**

4 people are chosen at random from a group of 15 people. What are the odds that all 4 people chosen were the oldest people in the group?

*October 13, 2014*

**math**

If the area of a rectangle is 2,460 square inches, what are its dimensions?

*September 27, 2014*

**Chemistry**

DrBob222 Please help me here! How do we do charge balance and mass balance? Plz give me an answer on a general basis so that i can do it for any compound i get. Thanks

*September 15, 2014*

**chemistry 1045L**

mass=(convert 2lb ==> grams) radius=(convert 3.5 inches ==>m^3==>L) then replace r in equation, and find volume. Then use density=mass/volume ;)

*September 15, 2014*

**Chemistry**

How do we calculate*

*September 15, 2014*

**Chemistry**

How do we do charge balance and mass balance? Plz give me an answer on a general basis so that i can do it for any compound i get. Thanks

*September 15, 2014*

**chemistry**

0.30 kW-hr

*September 12, 2014*

**Math**

That's part of the question. That's how the question is..

*September 3, 2014*

**Math**

My other number is even. My number is less than 300. Using 2,4,5

*September 3, 2014*

**ethics**

Dispositional values.

*September 1, 2014*

**Science**

If the continent were once connected, what might be similar about the coastlines where they were connected?

*August 15, 2014*

**SCience**

The purpose of surfactant in the lungs is to A. facilitate lung expansion. B. bind oxygen from the air. C. improve lung blood flow. D. remove pollutants in the air. I believe it's A

*July 23, 2014*

**trigonometry**

Find the distance the container is lifted as the winch is rotated through an angle of 5pi/6 radian and a having a radius of 6 in

*July 23, 2014*

**math**

A school has purchased a large field that has a square area of 19,500 ft2. What is the approximate length of each side of the square area? Round your answer to the nearest foot. a. 140 ft c. 142 ft b. 139.64 ft d. 139 ft

*July 17, 2014*

**math**

help please The measures of the sides of a right triangle form an arithmetic progression whose difference is 1. Find the measure of the hypotenuse

*July 14, 2014*

**math**

Help please find three consecutive numbers, which are in arithmetic progression whose sum is 39

*July 14, 2014*

**math**

help please 1. log2 x=1/2 2. log√x=-1 3. lnx=1+ln(x+1)

*July 14, 2014*

**sci**

how is it that kinetic and potential energy involve roller coasters and electricity.

*June 16, 2014*

**english 3**

The correct answer is "I MADE MY DECISION, AND I STAND BY IT"

*May 15, 2014*

**HELP MATH 5th grade**

if i answered it D + 6 + (3x4) then i do not need the 5 -- it says which number 3 4 5 6 is not needed

*May 13, 2014*

**HELP MATH 5th grade**

so which number is not needd to solve the problem 3 or 5

*May 13, 2014*

**HELP MATH 5th grade**

The question says the letter d

*May 13, 2014*

**HELP MATH 5th grade **

Sam has 3 pets. Monday she uses d cans of pet food. Tuesday she uses 6 cans Wednesday Thursday and Friday uses 4 cans each day How many cans does she use during thse 5 days? which number is not needed to solve problem? 4 3 5 6 - please explain

*May 13, 2014*

**Math help practice test**

Typo during the 5 days not 3 days

*May 13, 2014*

**Math help practice test **

Harvey has 3 pets. On Monday she uses d cans of pet food. On Tuesday she used 6 cans and wed thurs fri she uses 4 cans each day. How many cans does she use during these 3 days. Which number is not needed to solve this problem. 4 3 5 6 And why?

*May 13, 2014*

**ss**

and my answer is a

*May 2, 2014*

**ss**

the questiion can u check the answer

*May 2, 2014*

**ss**

my answr is A

*May 2, 2014*

**ss**

help i have a question i need help with and can you check my answer 10. most of Venezuela's population lives (1 point)

*May 2, 2014*

**s.s**

i just made a A never mind

*April 30, 2014*

**s.s**

oh now

*April 30, 2014*

**s.s**

mrs sue can you cheak my work please

*April 30, 2014*

**Math**

What mean (m) I don't anderstend.

*April 24, 2014*

**Math**

Jance spend from 7pm to 9pm doing her homework. She spend 3 times as mach time on her english project as she did on math. the science homework took twice as long as her math homework. How meny minutes did she spend on her science homework?

*April 24, 2014*

**English II B**

i would say a but i don't know for sure

*April 3, 2014*

**physics**

In a water park, people walk up a ramp before diving into the water below. If they cover a horizontal distance of 100 meters before diving down 50 meters, what is the angle made by the ramp with the ground?

*March 25, 2014*

**Math**

$9000.00

*March 21, 2014*

**Ethics**

2 is B Allows some harm to achieve a great good

*March 16, 2014*

**Ethics**

2 is B

*March 16, 2014*

**CALCULUS ECONOMICS**

First question: Q=440 and P=660. Second question: s=100

*March 13, 2014*

**S.S**

He Ms.sue how are you

*March 3, 2014*

**physics**

How to calculate the force required to move a 6.12Kg weight up a 10degree friction rig? I have done experiments on the friction rig, adding weight until the sliding weight moved, but the calculated results do not match up. Can anyone help?

*February 22, 2014*

**Statistics**

2. On a certain anxiety questionnaire, the population is known to have a mean of 12 and a standard deviation of 2.3. A higher score represents higher levels of anxiety. Participants in a new relaxation program complete the questionnaire after completing the program, and have a...

*February 19, 2014*

**Statistics**

1. A company decides to add a new program that prepares randomly selected sales personnel to increase their number of sales per month. The mean number of sales per month for the overall population of sales people at this national company is 25 with a standard deviation of 4. ...

*February 19, 2014*

**history**

genoses and venisian is the correct answer :P

*February 17, 2014*

**Algebra**

Solve for x: h=(k/4)(x-3L) Solve for B: v-6Bxk=7B Solve for S: z+(1/7)sk=(1/6)yk^2 Solve for x: 3F=10hx+10hv+10xv

*February 13, 2014*

**algebra & trigonometry**

Thank you Steve.

*February 11, 2014*

**algebra & trigonometry**

The area of a rectangle is 28 square inches. The length is 8 more than thrice the width. Find the length and the width. Thanks

*February 11, 2014*

**algebra & trigonometry**

x(2x+5)=12 2x^2+5x-12=0 (x+4)(2x-3)=0 2x-3=0 2x=3 x=3/2 3/2(2(3/2)+5)=12 3/2(3+5)=12 3/2(8)=12 24/2=12 12=12 width=3/2 length=8

*February 11, 2014*

**algebra & trigonometry**

Is w=-4 the correct answer? thanks

*February 11, 2014*

**algebra & trigonometry**

The area of a rectangle is 12 square inches. The length is 5 more than twice the width. Find the length and the width. Thanks

*February 11, 2014*

**algebra & trigonometry**

Thanks Steve.

*February 11, 2014*

**algebra & trigonometry**

The sum of two numbers is 210. If one number is the square of the other, find the set of numbers. Thanks

*February 11, 2014*

**courtesy**

Thank you Writeacher.

*February 11, 2014*

** courtesy**

How can i thanks someone for their help?

*February 11, 2014*

**algebra and trigonometry**

Thank you Steve

*February 11, 2014*

**algebra and trigonometry**

Thank you Steve.

*February 11, 2014*

**algebra and trigonometry**

At a college function, a total of 180 tickets were sold. The tickets were priced at $5, $10, and $15, and the money collected that day was $1,900. The sum of the numbers of $5 and $15 tickets sold was twice the number of $10 tickets sold. Find the number of each type of ticket...

*February 11, 2014*

**Statistics**

I found the mean but i do not know what the scores are. help. thanks

*February 10, 2014*

**Statistics**

Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For 15 subjects, the results were SumX=1008, and Sum(X-M)^2=140.4. Use this information to answer the following: a. What is the mean and SD for this data? b. Based on the data you ...

*February 10, 2014*

**Statistics**

My bad. Thanks.

*February 10, 2014*

**Statistics**

Age at onset of dementia was determined for a sample pf adults between the ages of 60 and 75. For 15 subjects, the results were SumX=1008, and Sum(X-M)^2=140.4. Use this information to answer the following: a. What is the mean and SD for this data? b. Based on the data you ...

*February 10, 2014*

**algebra & trigonometry**

Thanks Steve.

*February 9, 2014*

**algebra & trigonometry**

The profit of an organization is calculated by the function P(x) = x2 – 4000x + 7800000, where x is the number of units sold. If the net profit is 3800000, find the number of items sold. Thanks

*February 9, 2014*

**algebra & trigonometry**

At a grocery store, the number of customers arriving per hour is shown by the function f(x) = 2x + 1. Find the number of customers that arrived in the 6th hour. Thanks

*February 9, 2014*

**algebra & trigonometry**

Jerry wants to purchase some items whose cost function is , where x is the number of items. If Jerry spends between $50 and $80, find the minimum and maximum number of items that he can purchase. Thanks

*February 9, 2014*

**algebra & trigonometry**

Jerry wants to purchase some items whose cost function is , where x is the number of items. If Jerry spends between $50 and $80, find the minimum and maximum number of items that he can purchase.

*February 9, 2014*

**algebra & trigonometry**

A person wants to purchase two types of items, A and B, from a shop. She has $200 to spend, and she has to purchase at least 10 items. If the price of one unit of each A and B is $10 and $30, respectively, represent this problem graphically. Thanks

*February 9, 2014*

**algebra & trigonometry**

A school wants to purchase some round tables and some rectangular tables. The costs of one round table and one rectangular table are $20 and $25, respectively. The school wants to spend at most $1,000. Represent this problem for the purchase of x round tables and y rectangular...

*February 9, 2014*

**algebra & trigonometry**

A person wants to purchase two types of items, A and B, from a shop. She has $200 to spend, and she has to purchase at least 10 items. If the price of one unit of each A and B is $10 and $30, respectively, represent this problem graphically.

*February 9, 2014*

**algebra & trigonometry**

A patient is not allowed to have more than 300 milligrams of cholesterol per day from a diet of eggs and meat. Each egg provides 150 milligrams of cholesterol. Each ounce of meat provides 100 milligrams of cholesterol. Write an inequality that describes the patient’s ...

*February 9, 2014*

**algebra & trigonometry**

The sum of three whole numbers is 7. The second number is 1 more than the twice of the third number. The sum of first and third number is 3 less than the second number. Find all the three numbers. Thanks

*February 9, 2014*

**algebra & trigonometry**

The sum of three whole numbers is 7. The second number is 1 more than the twice of the third number. The sum of first and third number is 3 less than the second number. Find all the three numbers. Thanks

*February 9, 2014*

**Math**

six 1- pound bags

*February 4, 2014*

**density and pressure**

calculate the mass of air in a room measuring 5m*8m*10m if the density of air is 1.3kg/m cube

*January 28, 2014*

**physics**

calculate the mass of air in a room measuring 5m*8m*10m if the density of air is 1.3kg/m cube

*January 28, 2014*

**5th grade math help**

trying to check my sons answers "5 3/5 " divided by "2/3" How do i do this mom cant remember

*January 13, 2014*

**Statistics**

Blossom’s Flowers purchases roses for sale for Valentine’s Day. The roses are purchased for $10 a dozen and are sold for $20 a dozen. Any roses not sold on Valentine’s Day can be sold for $5 per dozen. The owner will purchase 1 of 3 amounts of roses for ...

*January 10, 2014*

**Maths**

Blossom’s Flowers purchases roses for sale for Valentine’s Day. The roses are purchased for $10 a dozen and are sold for $20 a dozen. Any roses not sold on Valentine’s Day can be sold for $5 per dozen. The owner will purchase 1 of 3 amounts of roses for ...

*January 9, 2014*

**Physics**

A proposed space station includes living quarters in a circular ring 46.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?

*December 24, 2013*

**Physics**

A small block of mass m = 1.3 kg slides, without friction, along the loop-the-loop track shown. The block starts from the point P a distance h = 54.0 m above the bottom of the loop of radius R = 19.0 m. What is the kinetic energy of the mass at the point A on the loop? What is...

*December 24, 2013*

**science help needed quick fools**

how do the circulatory and endocrine systems work together to help maintain homeostasis

*December 20, 2013*

**Geography**

All developed countries usually exhibit which of the following characteristics?

*December 19, 2013*

**English LAC 1**

the book is on the table

*December 18, 2013*

**Help me with this science.**

1.A 2.D 3.C 4.A 5.C I hope I really helped

*December 10, 2013*

**chemistry**

your explanation was extremely poor. "I'm sure you've done hundreds of these" If we did, then we wouldn't be looking up how to do the problem.

*December 8, 2013*

**Trigonometry**

At a point on a level ground, the angle of elevationof a mountain top B is 42deg36min. At a pointD350 meters nearer the mountain, the angle of elevation is 51deg 43 min. Find the height of the mountain?

*December 1, 2013*

**Chemistry**

Weak polyprotic acids are normally added to Coca Cola to lower its pH to about 2.5 and impart tartness? Show that a two litter cocacola bottled drink that contains 0.057 to 0.084 percent of 75 percent of phosphoric acid by mass,meets this ph requirement. Pka1= 2.12

*November 29, 2013*

**Chemistry**

Weak polyprotic acids are normally added to Coca Cola to lower its pH to about 2.5 and impart tartness? Show that a two litter cocacola bottled drink that contains 0.057 to 0.084 percent of 75 percent of phosphoric acid by mass,meets this ph requirement. Pka1= 2.12

*November 29, 2013*

**math**

HA GAYhsbydekbdudnetyenefs

*November 6, 2013*

**Science**

Umm... I was looking at these questions after my science quiz, and these are the EXACT QUESTIONS ON MY QUIZ.

*November 6, 2013*

**Algebra**

Thanks Ms Sue! I see what I did wrong! Thanks!

*November 5, 2013*

**Algebra**

What is the best estimate for 3 + (-14.9)(-2.3)? a 36 b 31 c 48 d 33 I came up with 36 but my teacher counted it wrong. I reworked it but still come up with A-36. What am I doing wrong?

*November 5, 2013*