Friday

February 12, 2016
Total # Posts: 2,335

**FLUID MECHANICS**

Air under standard conditions flows through a 5.0 mm-diameter drawn tubing with an average velocity of V = 55 m/s. Assume that the tube is smooth, the air is incompressible and no shear stress occur in the tube. Determine i. the pressure drop in 0.1 m section of the tube using...
*May 3, 2014*

**FLUID MECHANICS**

For oil (SG =0.86 and μ = 0.025 Ns/m2) flow of 0.5 m3/s through a round pipe with diameter of 500 mm, determine the Reynolds Number. Determine also whether the flow is laminar or turbulent.
*May 3, 2014*

**FLUID MECHANICS**

Water at temperature of 15°C flows through a pipe of diameter D = 2 cm and into a glass. Determine i. The minimum time taken to fill in a 0.5 L glass full with water if the flow in the pipe is to be laminar. ii. The maximum time taken to fill the glass if the flow is to be...
*May 3, 2014*

**Math**

I got a decimal, do i round it off ?
*May 2, 2014*

**Math**

Pedro built nine bicycles in 25 h. At this rate, how many bicycles will he build in a 40 h week.
*May 2, 2014*

**Spanish**

Thank you so much Sra. I added emotion = subjective to my notes. I did see your notes on gender. If there aren't too many exceptions I will just memorize them. I am a visual learner and your notes are so helpful to me. I can't thank you enough.
*April 30, 2014*

**Spanish**

I see what happened. The format was changed and the space I put after the ABC with my answer was removed. That is why #1 has ABCB. B is my answer #2 has ABCA with A as my answer ect..
*April 30, 2014*

**Spanish**

I don't know what happened to them. They were there when I posted. Here they are again. 1. B. miente 2. A. sea 3. C. esquiar 4. A. fume 5. B. estamos 6. B. amas 7. C. terminar 8. B. dice
*April 30, 2014*

**Spanish**

Sra. are my answers correct? Thank you! Part I ¿Subjuntivo, indicativo o infinitivo? Choose the correct verb form to complete each sentence. 1. Tengo miedo de que mi novio _____. A. mienta B. miente C. mentir B. miente 2. ¡Qué lástima que ese hombre ...
*April 30, 2014*

**statistics**

5 dollars
*April 29, 2014*

**social studies**

If you went to the map in your book, it shows you exactly where it is. It's on the Mediterranean Sea, which is D.
*April 28, 2014*

**MATH**

21x^3+67x^2-36=0 solutins
*April 26, 2014*

**Spanish**

Thank you so much Sra. Is there an easier way to remember that words like gente is feminine? I am used to the "o" and "a" signaling me towards a certain gender. I so appreciate your help.
*April 25, 2014*

**Spanish**

I have one more question. We have a paragraph we have to read and answer questions about. There is nothing about what to ask for after dinner so would this be ok? Indica por lo menos dos cosas que pedirás después de cenar en un restaurante español. Despu&...
*April 25, 2014*

**Spanish **

Sra, Are my answers correct? Thank you. Complete the following sentences using the subjunctive 1. Dudamos que ellos… Dudamos que ellos vengan a la fiesta. 2. Es imposible que ella... Es imposible que ella llegue aquí a tiempo. 3. Es importante que tú... Es ...
*April 25, 2014*

**algebra**

sqrt(3x+4) + 4 = 2x can you solve this with steps to help me please?
*April 23, 2014*

**Spanish**

Sra. can you please correct my answers? I am so grateful for your help! Part I Answer the questions using the "PRESENT PROGRESSIVE." 1. ¿Qué estáis estudiando ahora? Estoy estudiando español ahora 2. ¿Con quiénes están...
*April 17, 2014*

**social studies check answers**

What is the answer to number 2.? I think it's D.
*April 17, 2014*

**Language**

My teacher gave a bunch of words to define, and the word, Second hand pill is one of them. What does second hand pill mean ?
*April 16, 2014*

**Math**

The price of gas is 85.9 cents per Litre. If Brenda needs 48.3 L of gas to fill her gas tank, how much will she pay? Please show the steps.
*April 15, 2014*

**math**

A ball rebounds to one quarter from which it was dropped. approximate the total vertical distance the ball after being dropped from 3ft above the ground ,until it comes to rest
*April 15, 2014*

**chemistry**

If a 1.60 M sample of A is heated to 500 K, what is the concentration of B at equilibrium? A(aq)<---> 2B(aq) Kc=9.63x10^-6
*April 11, 2014*

**biology**

heterozygous red = Rb homozygous red= RR blue=bb
*April 11, 2014*

**Spanish**

Thank you so much!
*April 10, 2014*

**Spanish **

Are my answers correct? Parte I: Conteste las preguntas en frases completas en español 1. ¿Qué significan las palabras te y té? Te es un pronombre, mientras que el té es una bebida. 2. ¿Prefiere Ud. usar el tiempo futuro o IR A + ...
*April 10, 2014*

**Biology**

ystic fibrosis is caused by mutations in the CFTR gene, which encodes for a chloride channel. You are studying cystic fibrosis patients to determine what mutation they possess in the CFTR gene. The difference between the mutant and wild type CFTR can be uncovered by examining ...
*April 10, 2014*

**Science **

explain how a microclimate can affect crop production I need someone to explain this to me because i don't get it
*April 7, 2014*

**Science**

Describe how a large water body can affect the amount of snowfall a region receives in the winter.?
*April 7, 2014*

**Biology**

How do endotherms and ectotherms differ? a) Endotherms are warm-blooded and ectotherms are cold-blooded. b) Endotherms and ectotherms differ in the means by which they regulate their body temperature. c) Endotherms are regulators and ectotherms are conformers.
*April 7, 2014*

**Biology**

Select the correct statement describing feedback control in animals. Select the correct statement describing feedback control in animals. a) All ectotherms are conformers with respect to temperature. b) An animal may be a regulator for one environmental variable but a ...
*April 7, 2014*

**algebra**

divide 15x^2 + 10x -5 by 5x
*April 4, 2014*

**Math**

Each square represents 625 square feet, each line segment represents 25 feet. A galapagos tortoise must use 550 feet of fencing to enclose a space of 15,000.
*April 4, 2014*

**algebra**

thanks
*April 3, 2014*

**algebra**

solve the equation 3/ (x+1) - 1/x =1/2
*April 3, 2014*

**Spanish**

Are my answers correct? I had the most trouble with the accents in part II. Thank you. Part I Llene los espacios en blanco con la forma correcta del verbo en la forma del presente progresivo utilizando el verbo ESTAR con el gerundio. 1. Sé que vosotras no _____ ...
*April 2, 2014*

**Chemistry**

For the reaction: 2H^+(aq)+Zn(s)----->He2(g)+Zn^2+(aq) a) Write the reduction half-reaction b) Write the oxidation half-reaction c) Identify the oxidizing agent d) Identify the reducing agent
*April 2, 2014*

**math**

Alvin, Calvin and Melvin each have some positive integer number of sweets. Alvin has fewer sweets than Calvin, and they have 29 sweets in total. Melvin has 26 sweets more than Alvin. What is the maximum number of sweets that they can all have in total?
*April 2, 2014*

**math**

Adam and Bob went apple picking in an orchard. At the end of the day, they realized that if Adam had picked 50 more apples, he would have picked twice as many as Bob picked. On the other hand, if Bob had picked 50 more apples, he would have picked twice as many as Adam picked...
*April 2, 2014*

**Physics**

After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 1/5 their initial speed. Find the angle between the initial velocities of the objects.
*April 1, 2014*

**Spanish **

Am I correct? I. Conteste las preguntas utilizando mandatos formales. Trate de usar pronombres cuando posible. 1. ¿Es necesario apuntar la dirección? No, lo me no apunte la dirección. 2. ¿Debo sacar el plano de la ciudad? Saquelo. 3. ¿Es ...
*March 28, 2014*

**history**

how did Japan consolidate its hold over its people during the interwar period?
*March 25, 2014*

**science**

Thank you, G!
*March 22, 2014*

**Urgent Chemistry**

The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/...
*March 22, 2014*

**Chemistry**

The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/...
*March 21, 2014*

**Chemistry**

The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/...
*March 21, 2014*

**Trigonometry**

Let (7,-3) be a point on the terminal side of theta. Find the exact values of cos of theta, sec of theta and cot of theta?
*March 20, 2014*

**chemistry**

in which of the following pairs of compiunds are both members of the pair ionic compounds? a) PI3 and HBr, b) H2S and NCl3, c)LiF and H2O, d)LiI and NiO
*March 18, 2014*

**Basic English**

9. Which of the following sentences contains a comma splice? A. Our friend, who travelled from Tennessee, was quite tired when he arrived. B. The kitten climbed the drapes, it couldn't figure out how to get down. C. The cruise ship docked on Oahu, then again on Maui. D. We...
*March 18, 2014*

**chem**

which of the following compound contain more than 10 atoms per formula: a)ammonium phosphate, b) aluminium carbonate, C)iron(III) cyanide,
*March 17, 2014*

**Chemistry**

Thank you so much. I figured out what I did wrong.
*March 16, 2014*

**Chemistry**

This is a problem I got on my Mastering Chemistry homework: Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction mixture at equilibrium at 175 K contains PH2=0.958atm, PI2=0.877atm, and PHI=0.020atm. A second reaction mixture, also at 175 K, contains PH2=PI2= 0...
*March 16, 2014*

**Physics**

A man wishes to cross a river from A to B, a distance of 800m. He can row at 8km per hour, in what direction should he head the boat to travel directly from A to B? How long does it take him to reach B? Please show working. Thank You!
*March 16, 2014*

**Psychology**

What is the definition for "Practical problems" and "Ethical problems"
*March 13, 2014*

**Math**

how much should rod pay for a 10 year annuity that provides month end payments of 1800 at 4.5% compounded quarterly
*March 12, 2014*

**Chemistry Urgent**

95.0mL of H2O is initially at room temperature (22.0∘C ). A chilled steel rod at 2.0∘C is placed in the water. If the final temperature of the system is 21.3∘C , what is the mass of the steel bar? Specific heat of water = 4.18 J/g⋅∘C Specific heat...
*March 11, 2014*

**Chemistry Urgent**

A calorimeter contains 32.0mL of water at 13.0∘C . When 2.30g of X (a substance with a molar mass of 82.0g/mol is added, it dissolves via the reaction X(s)+H2O(l)¨X(aq) and the temperature of the solution increases to 30.0∘C . Calculate the enthalpy ...
*March 11, 2014*

**chemistry**

95.0mLmL of H2O\rm H_2O is initially at room temperature (22.0∘C\rm{} ^{\circ}C). A chilled steel rod at 2.0∘C\rm ^{\circ}C is placed in the water. If the final temperature of the system is 21.3∘C^{\circ}C, what is the mass of the steel bar? Specific heat of ...
*March 11, 2014*

**Chemistry**

Consider the following problem: Target: 2NOCl(g) ? N2(g)+ O2(g)+Cl2 (g) ?Hrxn= ? Steps: 1. 1/2 N2(g) + 1/2 O2(g)? NO(g) ?H= 90.3 kJ 2. NO(g) + 1/2 Cl2(g) ? NOCl(g) ?H= -38.6 kJ As you determine the ¥ÄHrxn value for the target equation above, what must be done to step ...
*March 9, 2014*

**chemistry**

Calculate the DHof for the following reaction under standard state conditions: 2 Ag2S(s) + 2 H2O(l) ---> 4 Ag(s) + 2 H2S(g) + O2(g) Given the following information: Ag2S(s) ÄHof = -32.6 kJ/mol H2O(l) Ä Hof = -285.83 kJ/mol H2S(g) ÄHof = -20.6 kJ/mol
*March 9, 2014*

**chemistry**

Consider the following problem: Target: 2NOCl (g) ¡æ N2 (g) + O2 (g) + Cl2 (g) ¥ÄHrxn= ? Steps: 1. ¨ö N2(g) + ¨ö O2(g) ¡æ NO(g) ¥ÄH= 90.3 kJ 2. NO(g) + ¨ö Cl2(g) ¡æ NOCl(g) ¥Ä H= -38.6 kJ...
*March 9, 2014*

**chemistry**

Calculate the DHof for the following reaction under standard state conditions: 2 Ag2S(s) + 2 H2O(l) ---> 4 Ag(s) + 2 H2S(g) + O2(g) Given the following information: Ag2S(s) ÄHof = -32.6 kJ/mol H2O(l) Ä Hof = -285.83 kJ/mol H2S(g) ÄHof = -20.6 kJ/mol
*March 9, 2014*

**math**

can you help me With my homework.
*March 8, 2014*

**prealgebra**

Caitlin's cylindrical jar holds 525 cubic inches. If the height of the jar is 7 inches what is the approximate diameter?
*March 6, 2014*

**Math**

How do you find the derivative of ln(xy)=x+y
*March 3, 2014*

**Geometry/Trig**

A plane is flying and show an air speed of 130 mi/h. However, there is a 20 mi/hr crosswind. What is the resulting speed of the plane.
*March 3, 2014*

**trigonomentry**

Ada travels from A on a bearing of 60˚ to station B on a distance of 15km.she then leaves to station C 10km away from B due east of station
*March 2, 2014*

**maths**

now there is a pool, the height of the pool is 48cm and the width is 2m, now 3 quarters are full, what will be the final answer in litres?
*March 2, 2014*

**Chemistry**

How has crude oil changes the country (positive and negative points)
*March 1, 2014*

**Analytical Chemistry**

A - 1 B-3 C-2 D-4 E-5 F-6 G-7
*February 28, 2014*

**geometry**

Circle the following quadrilateral that does Not have at least one pair of consecutive sides congruent. (A) rhombus (B)kite(C)isosceles trapezoid(D) square Circle the following quadrilateral that may have exactly one pair of consecutive sides of congruent. (A)rhombus (B) kite(...
*February 26, 2014*

**statistics **

Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a one-way ticket airfare between two cities MN. Key: 21|1=211 21 | 1 2 22 | 1 1 1 2 3 5 7 8 23 | 2 3 4 7 7 8 9 9 24 | 2 3 4 8 8 25 | 1 2 6 6 6 6 8 9
*February 23, 2014*

**statistics**

Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a one-way ticket airfare between two cities MN. Key: 21|1=211 21 | 1 2 22 | 1 1 1 2 3 5 7 8 23 | 2 3 4 7 7 8 9 9 24 | 2 3 4 8 8 25 | 1 2 6 6 6 6 8 9
*February 23, 2014*

**Physics**

Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 26.5 cm) 15.1 cm away from an object. Find the image distance. Answer in units of cm
*February 21, 2014*

**Social Studies**

Thanks so much for the answer Ms. Sue. Almost every single last answer you've ever given someone has been true, and I appreciate it so much!! I get 100% on almost every test because of you.
*February 10, 2014*

**Chemistry**

Thank you!
*February 10, 2014*

**Chemistry**

A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of one gram of mercury? =$...
*February 10, 2014*

**Chemistry**

A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of one gram of mercury? =$...
*February 10, 2014*

**Chemistry**

A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of one gram of mercury? =$...
*February 10, 2014*

**Math Urgent help please**

A lamppost casts a shadow of a man who is standing 15 feet away from the lamppost. The shadow is 5 feet long. The angle of elevation from the tip of the shadow to the lamp is 50. To the nearest foot, the lamppost is _____ feet tall. (Points : 2)
*February 10, 2014*

**math --- pls check my work!**

You must be extremely smart. I got a 100%, because of you. Thanks so much for your help. Keep up the good work, so that I can too!! xD
*February 3, 2014*

**SICK**

no matterfact I am sorry im not going to argue with teachers because that is very wrong.but I can give you all links to questions I posted through out the week with no answers??
*February 1, 2014*

**SICK**

ive been posting the same question for 2 days and you guys have been ignoring me no joke -_-
*February 1, 2014*

**Math**

Angie read 2 books in 5 days, and each book contained 340 pages. If Angie read the same number of pages each day, how many pages did she read per day? A.)75 B.)340 C.)680 D.)136
*February 1, 2014*

**social studies(CHECK ASNWERS)**

please check my answers and if there wrong maybe you could tell me the correct one.but thanks anyways. 1. How did the formation of the National Action Party change Mexican politics? A.It ended the one-party system. B.It consolidated power among a few key leaders. C.It ended ...
*January 31, 2014*

**socialstudies(CHECK ANSWERS)**

PLEASE CHECK MY ANSWERS please check my answers and if there wrong maybe you could tell me the correct one.but thanks anyways. 1. How did the formation of the National Action Party change Mexican politics? A.It ended the one-party system. B.It consolidated power among a few ...
*January 31, 2014*

**chemistry**

Need help balancing this chemical reaction equation Ca(NO3)2+2NaOH>Ca(OH)2+2NaNO3
*January 30, 2014*

**Calculus**

Find the critical numbers of the function. h(t) = t3/4 − 5t1/4
*January 28, 2014*

**Calculus**

A poster is to have an area of 160 in2 with 1 inch margins at the bottom and sides and a 7 inch margin at the top. What dimensions will give the largest printed area? (Give your answers correct to one decimal place.)
*January 28, 2014*

**Calculus**

Find the absolute maximum and absolute minimum values of f on the given interval. f(x) = (x2 - 1)3 [-1, 6]
*January 28, 2014*

**Calculus**

Find the absolute minimum and absolute maximum values of f on the interval below. f(x) = x4 - 8x2 + 6 [-3, 4]
*January 28, 2014*

**Calculus**

Find two numbers whose difference is 132 and whose product is a minimum.
*January 28, 2014*

**Calculus**

A box with a square base and open top must have a volume of 4,000 cm3. Find the dimensions of the box that minimize the amount of material used.
*January 28, 2014*

**Calculus**

A poster is to have an area of 160 in2 with 1 inch margins at the bottom and sides and a 7 inch margin at the top. What dimensions will give the largest printed area? (Give your answers correct to one decimal place.)
*January 28, 2014*

**Please help with Physics Quickly**

1. How are impulse and momentum related? (Points : 1) Impulse is the change in momentum of an object. Momentum is the change in impulse acting on an object. Impulse and momentum are always equal in magnitude. Impulse and momentum are the same thing. Question 2. 2. Which of ...
*January 27, 2014*

**Psychology **

Within each gene, elements of DNA are arranged in a particular order, forming a code that influences the synthesis of particular proteins. This code affects every aspect of the body, from its structure to the chemicals that keep it running. The above process describes:
*January 27, 2014*

**chemistry**

What is the concentration of a solution, in gsolute/100gsolvent, made using 2.29 g of KNO3 in 2.03 g of H2O?
*January 24, 2014*

**Social Studies**

The answer is A, lily
*January 23, 2014*

**History8**

the correct answer is d you guessed correct! Good job!!!
*January 16, 2014*

**literature**

Can someone help me in scansion of the poem "the poplar field" by William Cowper? need help to find base meter, scheme, stanza forms if any, and the metrical peculiarities such as end-stopped lines, run-on lines, elision, pause, feminine ending, masculine ending and ...
*January 15, 2014*

**Math**

the length of a rectangle is seven less than four times the width. Find the length if the area is 65 square units.
*January 11, 2014*