Thursday
July 31, 2014

Posts by anna


Total # Posts: 1,925

Physics
The melting point of substance X is -20 degrees Celsius and the boiling point is 90 degrees Celsius. How many Celsius degrees are there between the melting point and the boiling point? 20 degrees Celsius 70 degrees Celsius 90 degrees Celsius 110 degrees Celsius

Physics
A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the specific heat of Aluminum is 900 kJ/kg*C, and the spec...

Physics
Two Kids pull opposite directions on a toy with a mass of 18kg. One exerts a force of 695N and the other 135N. Both pull horizontally and friction is void. Calculate the new force in N?

algebra
The choices are: A. 15, 30, 45, 60 B. 5, 15, 45, 135 c. 0, 15, 45, 135 D. 15, 45, 135, 405 But I'm not sure how you find those answers??

algebra
5 x 3^n (This is all i have for the question but i dont know how to solve it)

algebra
thank you for the explanation!

algebra
please help as soon as possible!!!

algebra
Use the function rule f(x) = x × |-1|^x. Find the output f(2)

Spanish
Sra. do my answers look correct? Part I Los mandatos en contexto. Escoge el mandato apropiado. Pon atención al contexto para determinar si es un mandato formal o informal. 1. Sé que Ud. tiene hambre pero, ¡no _______________! A. lo come B. lo coma C. c&oac...

Physics
Someone in a car going past you at the speed of 24 m/s drops a small rock from a height of 1.6 m. How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is 9.8 m/s2.

math
a square plot with area 440m square if it has to be fenced, how many metres of wire Is required?

Spanish
¡Gracias! Usted es muy afortunado de tener un sobrino en Suiza. Espero poder visitar en el futuro.

Spanish
Hola Sra. Do these look ok? Part I ¿Conoces esta foto? 1. Es una vista del interior de la Mezquita de Córdoba. Tomando en cuenta la información en las secciones de Cultura en contexto (semanas 2 y 11) y los textos culturales Sevilla monumental y La Mezquit...

Spanish
Thank you so much!!

Spanish
Thank you Sra. I have one question. On number 13. The directions state to change the indicated verb and the one highlighted is estudiar. If estudiamos is incorrect would it be estudiar?

Spanish
Sra do theses look correct? Part I ¿Por o Para? Complete each statement correctly by choosing either POR or PARA. 1. Sacar buenas notas en esta clase es muy importante _____ mí. para 2. El drama Spy Kids fue escrito _____ Robert Rodríguez. por 3. Estuvimos...

Math
put in order this fractions 9/9, 2/3, 5/6, 4/12, 0/2 from the smallest to the largest? I dont know how?

Spanish
I was trying to say the bulls are scary and mean. Thank you so much for your help as always.

Spanish
Sra. will you please check my answers? Thank you so much! 1. Rewrite the following text in the imperfect indicative. Una vez al mes, mi hermana Sonia y sus amigos van al teatro. Son cinco compañeras de colegio que se llevan muy bien. María va todos los mié...

Eco
In January 2012, one US dollar was worth 50.0 Indian rupees. Suppose that over the next year the value of the Indian rupee decreases to 59.0 Indian rupees to one US dollar. Suppose also that the price level of all goods and services in India, as measured in rupees, falls 17.0%...

Science
Can someone please answer me questions..

Science
Can someone help me answer some questions. Homes near warm climate get a) colder winters b)warmer winters c) cold and warm winters d) none of the above When there is moisture in the air from a hot shower, the water is in which form: a) solid b) liquid c) gas d) all of the above

FLUID MECHANICS
Water flows at a rate of 0.040 m3/s in a 0.15 m diameter pipe that contains a sudden contraction section to a 0.06 m diameter pipe. Determine the pressure drop across the contraction section. Determine also the pressure difference due to the losses.

FLUID MECHANICS
Air at 45°C is flowing steadily in a 25 cm-diameter horizontal pipe made of plastic at a rate of 900 l/min. Determine the head loss, and the required pumping power input for flow over a 175m-long section of the pipe.

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...

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.

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...

Math
I got a decimal, do i round it off ?

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

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.

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..

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

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 ...

MATH
21x^3+67x^2-36=0 solutins

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.

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&e...

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 i...

algebra
sqrt(3x+4) + 4 = 2x can you solve this with steps to help me please?

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...

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 ?

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.

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

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

biology
heterozygous red = Rb homozygous red= RR blue=bb

Spanish
Thank you so much!

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 + infin...

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 ...

Science
explain how a microclimate can affect crop production I need someone to explain this to me because i don't get it

Science
Describe how a large water body can affect the amount of snowfall a region receives in the winter.?

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.

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 conforme...

algebra
divide 15x^2 + 10x -5 by 5x

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.

algebra
thanks

algebra
solve the equation 3/ (x+1) - 1/x =1/2

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 _____ ________...

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

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?

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....

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.

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 mejo...

history
how did Japan consolidate its hold over its people during the interwar period?

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/...

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/...

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/...

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?

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

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...

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

Chemistry
Thank you so much. I figured out what I did wrong.

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...

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!

Psychology
What is the definition for "Practical problems" and "Ethical problems"

Math
how much should rod pay for a 10 year annuity that provides month end payments of 1800 at 4.5% compounded quarterly

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...

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 chang...

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 ...

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 ...

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

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...

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

math
can you help me With my homework.

prealgebra
Caitlin's cylindrical jar holds 525 cubic inches. If the height of the jar is 7 inches what is the approximate diameter?

Math
How do you find the derivative of ln(xy)=x+y

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.

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

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?

Chemistry
How has crude oil changes the country (positive and negative points)

Analytical Chemistry
A - 1 B-3 C-2 D-4 E-5 F-6 G-7

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(...

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

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

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

Chemistry
Thank you!

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? =$1.99 What is the price of one gram of mercury? =$...

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? =$1.99 What is the price of one gram of mercury? =$...

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? =$1.99 What is the price of one gram of mercury? =$...

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)

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??

SICK
ive been posting the same question for 2 days and you guys have been ignoring me no joke -_-

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