Monday
October 20, 2014

Posts by SARA


Total # Posts: 3,730

physics
Jacob found a piece of a broken glass bottle. He picked it up and made these observations about it: 1. No color (clear) 2. Makes scratches on wood 3. Has a bumpy surface 4. Broke when I dropped it He thinks the glass is a solid and most of his observations could only apply to ...
March 5, 2013

Physics
A 1200.0-kg car speeds up from 16.0 m/s to 20.0 m/s. How much work was done on the car to increase its speed?
March 5, 2013

chemistry
Calculate the molar concentration of OH− ions in an 1.79 M solution of hypobromite ion (BrO−; Kb = 4.0 10-6).
March 4, 2013

Math...I think...
A building casts a shadow 54 feet long at the same time a 6 foot tall man casts a shadow 4 feet long. How tall is the tree?
March 1, 2013

Finance
CAN SOMEONE PLEASE PLEASE HELP ME WITH A FINANCE QUESTION THAT I POSTED YESTERDAY,WEDNESDAY,FEB 27TH @ 5:58PM.PLAEASE,ANY AND ALL HELP WILL BE GREATLY APPRECIATED
February 28, 2013

physics
a chinook salmon
February 28, 2013

physics
a moving walkway at an airport has a speed v1 and a length l. a woman stands on the walkway as it moves while the man in a hurry to reach his flight walks on the walkway with a speed of v2 relative to the moving walkway. how long does it take the woman to travel the distance l.
February 28, 2013

social studies
what injuries did they get in the lowell Massachusetts textile mills ? what did the implorers do about it ?
February 27, 2013

Finance
Please help me,math word problems make my brain go crazy. Some friends are urging you to chip in with them to buy a vacant parcel og land on the outskirts of your city. A one-fourth interest would cost you $10,000.Total annual expenses on the property are $2,200.When the ...
February 27, 2013

statistic
At a party there are 33 students over age 21 and 22 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.. You have given every student at the party the same chance to be ...
February 27, 2013

o.chem
how would doubling the concentration of the nucleophile affect the rate of an sn2 reaction?
February 26, 2013

calc 2
A computer takes 2 seconds to compute a particular definite integral accurate to 4 decimal places. Approximately how long does it take the computer to get 12 decimal places of accuracy using each of the LEFT, MID, and SIMP rules? Round your answers to one decimal place. (a) ...
February 25, 2013

chemistry
how is it possible for the same element to be oxidized in one reaction and reduced in another?
February 24, 2013

medical physics
Rx = 3000 cGy in 10 fractions, whole brain Rt and Lt laterals, KD Siemens 6x. The collimator is set for 22 X 16 cm2 portal films at 92.5 cm SSD. Calculate the treatment port MU to isocenter. Calibration performed std. SAD; treatment performed SSD (assume SSDs at the calc point...
February 20, 2013

calculus!!!
Find the integral of: 2xsqrt(x+1) dx
February 20, 2013

calculus
Find the integral of: (x+2)/(x^3+2x^2-3x)dx
February 20, 2013

math
If a person runs 5 miles in 1 hour, how far will they run in 5 minutes?
February 19, 2013

math
) The circle graph below gives the inventory of the women's department of a store. Coats $49,737 Dresses $47,208 Skirts Lingerie $9273 $5058 Slacks Socks $15,174 Blouses $2529 $5901 What is the total inventory?
February 17, 2013

Finance
Would anyone be able to help me out please? You buy 100 shares of XYZ at $40per share.XYZ pays an annual dividend of $2 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 yrs and that the stock will increase 5% each...
February 17, 2013

Life orientation
Hi Sello.I worked in management for yrs so I hope this helps you. There is several laws protecting the employee in the work force. 1]The Federal Civil Rights Act of 1964 prohibits employers from discriminating against job seekers and employees on the basis of race,religion,sex...
February 17, 2013

Finance
I've posted this question once already and really need help. You buy 100 shares of XYZ at $40 per share.XZ pays an annual dividend of $2.00 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 years and that the ...
February 15, 2013

Financial
You buy 100 shares of XYZ at $40 per share.XYZ pays an annual dividend of $2 and offers an automatic dividend reinvestment plan.Assume that the dividend will remain constant over the next 5 years and that the stock will increase 5% each year.How much will your XYZ investment ...
February 14, 2013

Chemistry
The solubility of nitrogen in water is 6.9 x 10^-4 at exactly 1 atm pressure. What is the solubility of nitrogen under .80 atmp pressure? I don't know where to start with this problem, what formula do I use?
February 13, 2013

chemistry
how would that help trying a new solvent? i dont understand why the recovery would be so poor, do you know?
February 11, 2013

chemistry
a student dissolves 80 mg of a crude product in 4.5 mL( the minimum required) of methanol at 25 deg C . She cools the solution in an ice bath and obtains crystals. The crystals are recovered by filtration and rinsed with 0.5 mL of ice-cold methanol. After drying, the weight of...
February 11, 2013

calculus
Find the integral of (tan x)^2 sec(x)dx
February 11, 2013

calculus
Find the integral of: dx/(x^2-4x)
February 11, 2013

chemistry
I got x= 8.88 g the second extraction you mean the same solve, that means I should do 8.88+8.88= total of z?
February 9, 2013

chemistry
Suppose a compound Z had a partition coefficient of 8.0 in ether-water. If 10.0 g of Z was dissolved in 100 mL of water, and if the water solution was extracted with two 100 mL portions of ether, answer the following questions. show your calculation. a) What is the total ...
February 9, 2013

Chemistry
what conditions are shared by cities that suffer from photochemical smog?
February 6, 2013

PLEASE CHECK THESE ANSWERS AMERICAN GOV
1. Question : The purpose of the War Powers Act is to Student Answer: INCORRECT allow the Commander in Chief to issue informal declarations of war. to grant the President unlimited military powers. grant Congress equal military power with the President. CORRECT ensure ...
February 3, 2013

Chemistry
54.0 mL of a 1.50 M solution is diluted to a total volume of 258 mL. A 129-mL portion of that solution is diluted by adding 165 mL of water. What is the final concentration?
February 2, 2013

PHYSICS
Because Earth's rotation is gradually slowing, the length of each day increases: The day at the end of 1.0 century is 1.0 ms longer than the day at the start of the century. In 93 centuries, what is the total (in hours) of the daily increases in time (that is, the sum of ...
February 1, 2013

PHYSICS
Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.4 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual ...
February 1, 2013

PHYSICS
During heavy rain, a section of a mountainside measuring 5.4 km horizontally (perpendicular to the slope) 0.80 km up along the slope, and 2.1 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley ...
February 1, 2013

math
what is formula to show how much time it took car to travel 7km is .4hrs
January 30, 2013

medical transcription 2
I need help finding an answer in the Diagnostic imaging/interventional radiology TE #13, which is MRI brain for Edgar jorda. The part where it says: "The ________ appears minimally changed from the study..."
January 24, 2013

Physics
Q1 and Q2 are charged objects of the same sign separated by a distance 29.9 m. If you place another charged object (Q3) a distance 8.0 m from Q2 along a direct line between Q1 and Q2, it experiences no net electric field. So, if the magnitude of Q2 = 9.3 C, what is the ...
January 23, 2013

physics
In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 × 10−27 kg) were fired toward a gold nucleus with charge +79e. An alpha particle, initially very far from the ...
January 23, 2013

Math
This table gives the number of AIDS cases reported in men in Los Angeles from 1983-1989: Month and Year of Diagnosis AIDS cases reported in period Jan-June 83 116 July-Dec 83 154 Jan-June 84 197 July Dec 84 269 Jan-June 85 415 July-Dec 85 503 Jan-June 86 668 July-Dec 86 773 ...
January 23, 2013

math
What are the basic elements of an effective medical office financial policy?
January 23, 2013

chem
for 2Al2O3----> 4Al(s) + 3O2 the question is what is the heat change for the formation of 1 mol of aluminum oxide from its elements? Al2O3:-1676.0 O2:0.0 Can someone please explain how to complete this problem step by step please??
January 22, 2013

Math
Write an equation: x varies directly as y and inversly directly to the cube of Z
January 21, 2013

Health
Thank you so very much. These websites are a great help to me.
January 19, 2013

Health
I have to create a nursing case study. I have everything I need, but am not sure how to present it. Details: 67 year old causcasain male diagnosed with emphysema returns with shortness of breath, etc. supposedly associated with CHF. Have to have everything including ABCD ...
January 19, 2013

Chemistry
A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the tank burst? b. will it ...
January 16, 2013

Chemistry
A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the tank burst? b. will it ...
January 16, 2013

Chemistry
I'm supposed to compare the percent composition of gases in the atmosphere at sea level to the percent composition at high altitude.. Would the percents decrease? I don't really understand
January 16, 2013

Chemistry
explain why a sealed bag of potato chips "puffs out" (increases in volume) if taken from sea level to a high mountain pass. I know this has to do with pressure.. so is it because the higher up you go, the less pressure there is? Thanks!
January 16, 2013

bio
The most common protein secondary structures (the alpha helix and beta conformation) are stabilized primarily by A. ionic bonds B. hydrogen bonds C. disulfide bonds D. van der Waals interactions E. hydrophobic interactions
January 16, 2013

integrated math
Suppose a laboratory has a 26 g sample of polonium-210. The half-life of polonium-210 is about 138 days.?
January 15, 2013

Chemistry
Just having some trouble with this chemistry problem.. Thanks for help! Toxic carbon monoxide (CO) gas is produced when fossil fuels such as petroleum burn without enough oxygen. The CO can eventually be converted to CO2 in the atmosphere. Automobile catalytic converters are ...
January 15, 2013

Chemistry
What volume would be occupied at 0°C and 1 atm by 3 mol CO₂(g)? I just might need someone to help me work this out, I would greatly appreciate it! I don't understand this chemistry problem.
January 15, 2013

Physics
i think d
January 15, 2013

math
a ball is dropped from a height of 10 ft. if the ball's height after t sec is modeled by the following equation h(t)=-16t^2+10. when does the ball hit the ground?
January 15, 2013

math
Roses were planted 100 cm apart around a rectangular garden. There were no roses at the corners. They started 1 m from each corner. The garden was 5 m by 3 m. How many roses were planted?
January 15, 2013

Chemistry
Assume that the LHMP is enclosed in a transparent polymer stucture. a. How will the gases inside LHMP be affected by hot days and cool nights? b. What design features might be incorporated in the LHMP to reduce those heating and cooling effects? I know that gases expand in ...
January 13, 2013

Chemistry
In planning to administer a gaseous anesthetic to a patient, a. Why must the anesthesiologist take into account the fact that during surgery the gaseous anesthetic is used both at room (18 degrees C) and the patient's body temperature (37 degrees C)? The warmer the ...
January 13, 2013

Chemistry
If a sample of gas is cooled at a constant pressure until it shrinks to one-fourth its initial volume, what change in its kelvin temperature must have occurred?
January 13, 2013

Algebra
Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
January 13, 2013

Algebra
Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
January 13, 2013

Algebra
Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
January 13, 2013

Algebra
Nadia has 32 coins made up of nickles, dimes, and quarters. The sum of the number of nickels and the number of quarters is three times the number of dimes. If the total value of the coins is $4.60, how many of each kind does she have? I can't figure out how to make this ...
January 13, 2013

Math
Name the lengths of the sides of three rectangles with a perimeter of 12 units. Use only whole numbers
January 9, 2013

Physical science
Compute the gravitational force between two 1.00 kg lead spheres whose centers are 1.00 m apart?
January 6, 2013

physics
Ceres is a dwarf planet located in the asteroid belt between the orbits of mars and Jupiter. the radius of Ceres is 4.76 x 10^5 m. suppose an astronauts stands on the surface of Ceres and drops a 0.85 kg hammer from a height of 1.25 m. the hammer takes 3.0 to reach the ground...
January 5, 2013

Algebra
8s+ 12 = 16, 6s+ 9t = 12 solve by substitution
December 8, 2012

French
1. J'utilise un ventilateur quand il fait chaud. 2. Je n'utilise pas le congélateur si j'ai froid. 3. Il ya une couverture sur mon lit. 4. Mes livres sont sur ​​l'étagère. 5. Je mets mes vêtements dans l'armoire. 6. ...
December 4, 2012

French
1. J'utilise un ventilateur quand il fait chaud. 2. Je n'utilise pas le congélateur si j'ai froid. 3. Il ya une couverture sur mon lit. 4. Mes livres sont sur ​​l'étagère. 5. Je mets mes vêtements dans l'armoire. 6. ...
December 4, 2012

science
Fast help Please Hurry!!!!!!!!!!!!!!!!!!!!!! A bicyclist is in a 50-km race. He says he had an average velocity of 35. What is missing in the cyclist’s velocity? A. units only B. units and distance C. direction only D. units and direction
December 3, 2012

science
Thanks so much!
December 3, 2012

science
im blank today please help thanks!!!!!!!!!!! It takes a car 1.75 h to go from mile marker 10 to mile marker 115. What is the average speed of the car? A. 1.6 mph B. 60 mph C. 65 mph D. 183 mph
December 3, 2012

Algebra2
Check? Give the slope and y-intercept of the given line. 1. 2x-3y=6 = 3y = 2x-6 y = 2/3 x - 2 2. y=-2x = 2/1x + 1 3. y=3 = y=3/1x + 3 3y = 2x-6 y = 2/3 x - 2
November 29, 2012

Algebra2
Check? Give the slope and y-intercept of the given line. 1. 2x-3y=6 = 3y = 2x-6 y = 2/3 x - 2 2. y=-2x = 2/1x + 1 3. y=3 = y=3/1x + 3 3y = 2x-6 y = 2/3 x - 2
November 29, 2012

Algebra2
Graph the given function using the given values of x. 1. f(x) = 5 ; x = -3, -2, -1, 0, 1, 2, 3 2. g(x) = x^3 + 2 ; x = -2, -1, 0, 1, 2
November 29, 2012

math
What's the inequality ? the crowd that heard the President speak was estimated to be 10000 people.The actual crowd could be 750 people more or less than this. what are the possible values for the actual crowd size?
November 27, 2012

Math .-.
All eighth grade students can choose to take one of the following elective courses: art, chorus, band, or woodworking. There are 2o more students enrolled in chorus than art. Band has 3/4 the enrollment as chorus. woodworking has 5 fewer students than band. Which expressions ...
November 26, 2012

Chemistry
Calculate pH of NH4OH which is 1%ionized
November 20, 2012

Grammar
which one should be capitalized? (the Rocky Mountains)
November 19, 2012

7th grade math Ms. Sue please
(1 pt) Max’s percent increase was about 1.1% more than Sara’s.
November 19, 2012

physics
Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 2.6×10 13 electrons. The elemental charge is 1.6 × 10 −19 C. Answer in units of C
November 18, 2012

Science
How can knowing about the chemical properties of different elements help a society become more sustainable?
November 14, 2012

Statistics
$50.50+-11.08$
November 14, 2012

chemistry
assuming the reaction goes to completion, determine the final concentration of NH4Cl in the calorimeter. NH4Cl(s)+ H2O(l)-> NH4Cl(aq) concentration of NH4Cl is 1.00M its specific heat is 3.93 and density is g/ml. note: the exact same question was asked for a previous ...
November 13, 2012

physics
A ball is thrown horizontally off the top of a 65 m tall building at a velocity of 7.8 m/s. How far did the ball land from the base of the building? Round your answer to 2 decimal places.
November 11, 2012

physics
A ball is thrown horizontally off the top of a 65 m tall building at a velocity of 7.8 m/s. How far did the ball land from the base of the building? Round your answer to 2 decimal places.
November 11, 2012

physics
A rifle allowed a bullet fired with an initial horizontal velocity to travel 76.0 m while only falling a distance of 0.40 m. What was the initial x-velocity of the bullet? Round your answer to 2 decimal places.
November 11, 2012

Statistics
A random sample of 14 evenings at the O'Sullivan house hold showed that the family received an average of 2.4 solicitation calls each evening. The sample standard deviation was s= 0.9. Find a 99% confidence interval for the population mean number of solicitation calls this...
November 7, 2012

Chemistry
1.63E-27 photon/sec
November 5, 2012

Chemistry
Calculate the mass of CO2 emitted (in lbs) when 1 gallon of octane is burned
November 4, 2012

algebra
If $1000 is invested in an account that earns 11.75%, compounded annually, what will the account balance be after 12 years?
November 4, 2012

physics
its includes 1. about any diameter 2. about a tangent in its plane 3. about a tangent perpendicular to its plane
November 1, 2012

physics
moment of inertia of a ring perpendicular to tangent and its plane
November 1, 2012

Physics
a refree throws a basketball vertically upward with an inital speed of 5.0m/s determine the maxium height above the floor reached by the basketball if it starts from a height of 1.50m
October 28, 2012

Physics
a refree throws a basketball vertically upward with an inital speed of 5.0m/s determine the maxium height above the floor reached by the basketball if it starts from a height of 1.50m
October 28, 2012

Physics
Thanks!!
October 27, 2012

Physics
A car of mass 1100 kg starts from rest at sea level and climbs a hill of altitude 50 m. At the top of the hill the car has a speed of 25 m/s. From the top of the hill the driver turns off the engine and coasts down to an altitude of 15 m. Assume the friction and the air ...
October 27, 2012

Physics
A car of mass 1100 kg starts from rest at sea level and climbs a hill of altitude 50 m. At the top of the hill the car has a speed of 25 m/s. From the top of the hill the driver turns off the engine and coasts down to an altitude of 15 m. Assume the friction and the air ...
October 26, 2012

Physics
A car of mass 1100 kg starts from rest at sea level and climbs a hill of altitude 50 m. At the top of the hill the car has a speed of 25 m/s. From the top of the hill the driver turns off the engine and coasts down to an altitude of 15 m. Assume the friction and the air ...
October 25, 2012

calculus
A street light is mounted at the top of a 6-meter-tall pole. A man 2 m tall walks away from the pole with a speed of 1.4 m/s along a straight path. How fast is the tip of his shadow moving when he is 16 m from the pole?
October 16, 2012

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