Friday
November 28, 2014

Posts by Unknown


Total # Posts: 905

Chemistry
You are preparing 500 mL of a 0.300 M acetate buffer at pH 4.60 using only sodium acetate, 3.00 M HCl, 3.00 M NaOH, and water. Calculate the quantities needed for each of the following steps in the buffer preparation. 1. Add sodium acetate to ~400 mL of water in a large beaker...
February 28, 2012

math
Isabel took 20 minutes to run around the track six times. John took 3 minutes to run around the track once. Which student was running faster? Please explain how you found out.
February 27, 2012

math
what is one fourth of 10?
February 27, 2012

math
A box holds 2 blue marbles and 6 red marbles. How many and what color marbles could you remove from the bag to make the probability of picking red 1/2?
February 24, 2012

math
Keith, Annie, Elizabeth, and Marcus are taking a picture. How many different ways can the friends stand in a horizontal line?
February 24, 2012

math
Nick is writing the 4 letters in his name in different orders. In how many orders can he put the letters?
February 24, 2012

Political Science
In the past decade, policies have included not-for-profit organizations for the administering of programs such as welfare or child protection services. What are the strengths and weaknesses of using this forum?
February 21, 2012

Political Science
Is the rational-comprehensive model or the incremental model best used to describe policymaking in the United States? Provide examples to support your model choice
February 18, 2012

Civics
Which statement about the relationship between the judiciary and the federal bureaucracy is false? The federal bureaucracy is subject to the authority of the judicial branch. If a court finds fault with government action, it can issue an injunction. =The United States ...
February 15, 2012

Political Science
From the 1970s to the present, a shift in the evolution of public policy moved toward a New Federalism. How did this effect public policy? Was this positive or negative? Why?
February 15, 2012

Chemistry
If 56 j of heat is added to an aluminum can with a mass of 19.6 g, what is its temperature change?
February 8, 2012

geometry
if a square pryramid has a volume of 91.1ftcube and a height of 7 ft, what is the length of a side of the base?
January 31, 2012

math
I dunno know
January 23, 2012

Chemistry
What is the mass of 65.0mL of ethanol? the density of ethanol at room temperature=0.789g/mL
January 20, 2012

writing
write a 150-200 word paragraph to explain how purpose, content, audience, and tone impact academic writing.
January 13, 2012

math
"A 12-pack of cinnamon scented pencils sells for $3.00 at a school booster club sale. What is the sales tax rate if the total cost of the pencils is $3.21?" what is the answer and how do you show the work?
January 9, 2012

math
tan theta= 15/8 and pi< theta<3pi/2 a. Sin(- theta) b. cos2theta c. sin( theta - 3pi/4) d. cos(theta/2) can someone explain to me how do you find the exact value for these?
November 20, 2011

math
it's to find the exact value..sorry i didnt mentioned before and thanks
November 20, 2011

math
cos 23pi/12 i tried doing it and i got 0.994.. is that right? can someone explain how to do this to me? thanks!
November 20, 2011

chemistry
Imagine that you have a 5.00L gas tank and a 3.50L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145atm , to what pressure should you fill the...
November 18, 2011

chemistry
To identify a diatomic gas (x2), a researcher carried out the following experiment: She weighed an empty 3.4L- bulb, then filled it with the gas at 1.20 atm and 22.0 C and weighed it again. The difference in mass was 4.7g . Identify the gas. Express your answer as a chemical ...
November 18, 2011

chemistry
Consider 4.00L of a gas at 365mmHg and 20*C. If the container is compressed to 2.80L and the temperature is increased to 35*C, what is the new pressure,P2 , inside the container? Assume no change in the amount of gas inside the cylinder
November 18, 2011

chemistry
in an experiment 5.00ml of 0.1440 mol L^1- aqueos KIO3 was reacted with an excess of aqueous iodide and the molecular iodine I2, Formed was titrated against 0.1000mol L^1- aqueous S2O3^2- the equation for the titration reaction is: I2(aq)+ 2 S2O3^2-(aq)---->S4O6^2-(aq)+ 2I...
November 17, 2011

english-kite runner
Hey so im reading the kite runner and i have to asnwer comprehension quesions n idk how to answer these questions...sparknotes kinda help but at the same time it doesnt. so can somebody help me. 1) How did Hassan come into Amir's life? What contrast is made between Amir ...
November 16, 2011

math
The greatest common factor of two numbers is 5. What could the two numbers be?
November 9, 2011

math
A piece of paper is 280 millimeters long and 200 millimeters wide. You want to draw a grid on the paper so that there is a whole number of squares on the paper. What are the possible sizes of thet is the largest possible squares?
November 9, 2011

homework
People should not have this question .someone give me answers
October 30, 2011

math
a figure skater must trace a figure eight on the ice that consists of two perfect circles, each with radius 11 feet. How far does the skater go one time around the figure eight?
October 28, 2011

math
Jan says if you double each of the dimensions of a rectangular box, it will take twice as much wrapping paper to wrap it. How do you respond?
October 28, 2011

pre algebra with pizzazz 239
I don't understand how you question Y to C, All I know is that you have to divide? But how do get the correct answer?? My friend told me the answer is "They could never find another man of his calibre", but they couldn't explain it to me so I couldn't ...
October 27, 2011

math
Mr.Hash bough some plates at a a yard sale. After arriving home he found that 2/3 of the plates were chipped, 1/2 were cracked, 1/4 were both chipped and cracked. Only 2 plates were w/o chips or cracks. How many plates did he buy in all?
October 24, 2011

math
an end-of -the season sale for winter clothes advertise 30%-45% off the orginal peice. what was the highest original price of a jersey that is now on sale for $12.99. Give your answer as a deciaml rounded to the hundreths place.
October 24, 2011

math
if the $180 you spend each month on room and board represents 3/5 of your monthly income,what is your monthly income?
October 24, 2011

physics
He Goes on to ask what the force applied to the rope is the sum of the x's the sum of the y's the force applied to the car and the force applied to the tree
October 22, 2011

spanish
Es la calculadora de Adela?
October 21, 2011

math
sara is thinking of a number that is a repeating deciaml of the form 0. abcdabcd...find sara's number using the following clues. a. the digit that is located 100 places after the deciaml is 4. b. the digit that is 150 places after the deciaml is 5. c. the digit that is 175...
October 12, 2011

math
order the following list of numbers from smallest to largest. desricbe any restrictions that apply. respond the general case, not a specific example. Then explain where .cb wold appear in the list. .ab .aca .a
October 12, 2011

math
A whole brick is balanced with ¾ pound and ¾ brick. What is the weight of the whole brick?
October 12, 2011

math
If the twelfth term of an arithmetic sequence is 58 and the constant difference is 2, what is the first term of the sequence?
October 12, 2011

math
Gino just opened a pizza restaurant. He had 1 customer the first day, 3 the second day, 6 the third day, and 10 the fourth day. a. If this pattern continues, how many customers should gino expect on the seventh day? Day 10? Show the data table (for rate of change) b. Does the ...
October 12, 2011

POW#4 Read MY Mind
243 813 423 831 281
October 10, 2011

Diff Calculus
Find the interval(s) where the function is increasing of decreasing. find the: a) critical value(s) b) critical point(s) c) max. value + max. point d) min.value and min. point e)point on inflection if there is: 1) y=x^4-3x^3+22x^2-24x+12 thanks:)
October 2, 2011

Geometry
(-1,-4)
October 1, 2011

Math 116 a
you are right katie
September 26, 2011

Math 116a
no it would be x/.45
September 26, 2011

math
90 children were at a picnic on the beach. 3/5 of the boys and 5/8 of the girls were swimming. If 35 children were not swimming, how many boys were swimming?
September 22, 2011

PHYSICS!
Orville walks 270 m due east. He then continues walking along a straight line, but in a different direction, and stops 230 m northeast of his starting point. How far did he walk during the second portion of the trip and in what direction? Please I need a good explanation for ...
September 17, 2011

maths
The length and breadth of a rectangle are (3x - 4y) and (2x - 3y) units resp. Find its area (i) If the length is increased by 3y units and the breadth is increased by 2y units, what would the area of the new rectangle be? (ii) Find the difference between the area of the two ...
September 14, 2011

physics
Samantha is 1.32 m tall on her eleventh birthday and 1.57 m tall on her twelfth birthday. By what factor has her height increased? Isnt the answer 0.189?! because that doesn't seem to be the write answer
September 10, 2011

Physics
An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.1 km?
September 10, 2011

Physicsss
can you please explain that answer a little bit more because i really need to get this question right
September 10, 2011

Physicsss
A typical virus is a packet of protein and DNA (or RNA) and can be spherical in shape. The influenza A virus is a spherical virus that has a diameter of 85 nm. If the volume of saliva coughed onto you by your friend with the flu is 0.023 cm3 and 10−9 of that volume ...
September 10, 2011

physics plzz
THANK YOU SOOO MUCH :D
September 10, 2011

physics plzz
In a game against the White Sox, baseball pitcher Nolan Ryan threw a pitch measured at 40.4 m/s. If it was 18.7 m from Nolan's position on the pitcher's mound to home plate, how long did it take the ball to get to the batter waiting at home plate? Treat the ball's ...
September 10, 2011

mathematics
number 4
August 29, 2011

mathematics
A cylindrical gasoline can is 18 inches across and 20 inches tall. which expression represents the approximate volume in cubic inches ? 1) (3.14)(9)2(20) 2) (3.14)(9)(20)2 3) (3.14)(18)(20) 4) (3.14)(18)2(20) 5) (3.14)(36)2(20)
August 29, 2011

Geometry
If AB=2x-5 and BC=x+1, then find AB.
August 13, 2011

Phil103 Informal Logic
1. Question : If P is false, and Q is false, the truth-value of "P ¡êQ" is Student Answer: INCORRECT false. CORRECT true. Cannot be determined. All of the above. Instructor Explanation: The answer can be found in Chapter Six of An Introduction to Logic. ...
July 31, 2011

physics
A grandfather pulls his grandson, whose mass is 20kg and who is sitting on a swing with ropes of length 2.50m, backward and releases him from rest. The speed of the grandson at the bottom of the swinging motion is 3.0 m/s. What is the angle (in degrees measured relative to the...
June 13, 2011

Physics
An advertisment claims that a certain 1200 kg car can accelerate from rest to a speed of 25 m/s in 8.0 s. what average power must the motor supply in order to cause this acceleration?
June 13, 2011

physics
a 2.0 kg particle is given a displacement (delta)r= 2.0i+3.0j (m). During this displacement, a constant force, F=2.0i-5j (N) acts at the particle. find the work done by the force for this displacement.
June 13, 2011

physics
A sled with mass 20 kg is given a shove up a frictionless incline which makes an angle of 28 degrees with the horizontal. eventually the sled comes to rest at height of 1.35 m above where it started. a)calculate its initial speed. b)find the work done by the weight of the sled.
June 13, 2011

physics
A 0.2 kg conductor of length 0.8 m carries 2 ampere current to the right in a magnetic field. What is the magnitude and the direction of the magnetic field acting on the conductor if the net force on the rod is zero? (Assume that the rod is hung by two insulating supports.)
June 12, 2011

physics
Marks: 4 A circular plate of radius 0.5 m is placed perpendicular to the direction of the magnetic field of 0.5 Tesla. What is the change of flux in the plate if it rotates and its plane becomes parallel to the direction of the magnetic field?
June 12, 2011

physics
Marks: 2 The emf produced in a generator is What is the frequency of rotation of the circular coil? Choose one answer. a. 100 Hz b. 60 Hz c. 50 Hz d. 25 Hz
June 9, 2011

physics
A rectangular loop with 100 turns and area of 0.12 m2 rotates at 100 rad/s. The axis of rotation of the square is perpendicular to the direction of the magnetic field of 0.025 Tesla. What is the maximum emf induced in the loop? Choose one answer. a. 30 V b. 94 V c. 188 V d. 250 V
June 9, 2011

physics
Marks: 2 The magnetic field of the loop increases from 0.0 Tesla to 0.2 Tesla in 0.4 seconds. The cross sectional area of the loop is 0.6 m2. What is the average current induced in the loop if the coil has a resistance of 1.5 Ω? Choose one answer. a. 0.1 A b. 0.2 A c. 0....
June 9, 2011

physics
Marks: 2 The magnetic field of a circular loop of wire changes from 0.3 Tesla to 0.4 Tesla in 0.2 seconds. What is the induced emf produced in a coil if the area of the circular loop is 1m2? Choose one answer. a. 0.1 V b. 0.2 V c. 0.5 V d. 0.6 V
June 9, 2011

Chemistry
Okay thanks a lot, i really do appreciate this. have a good day
June 6, 2011

Chemistry
If 0.500 L of a 0.600 M SnSO4 solution is electrolyzed for a period of 30.00 min using a current of 4.60 A and inert electrodes, what is the final concentration of each ion remaining in the solution? (Assume that the volume of the solution does not change) I wanted to use the ...
June 6, 2011

physics help!
An electron enters the region of a uniform electric field between two oppositely charged parallel plates as shown, with an initial velocity of 3 x 106 m/s. The electric field between the plates is measured to be E = 200N/C. The horizontal length of the plates is 10cm. a. Find ...
May 12, 2011

help fast ,( physics)
drwls, here is a diagram of the problem: imgur dwtxf Because Jishka blocks internet addresses, you have to 1. add com after imgur 2. after com, add a forward slash
May 12, 2011

help fast ,( physics)
What is the net electrostatic force on the charge q3 (-48ìC), due to charges q1(+78ìC) and q2 (+50ìC)?
May 12, 2011

Physics
A child of mass 40 kg stands beside a circular platform of mass 115 kg and radius 1.6 m spinning at 3.8 rad/s. Treat the platform as a disk. The child steps on the rim. a) What is the new angular speed; b) She then walks to the center and stay there. What is the angular ...
May 10, 2011

Physics
A turntable with a moment of inertia of 0.029 kg*m^2 rotates feely at 2.8 rad/s. A circular disk of mass 270 g and diameter 20 cm, and initially not rotating, slips down a spindle and lands on the turntable. a) Find the new angular speed. b) What is the change in kinetic energy?
May 10, 2011

physics ( help)
The active element of a certain laser is made of a glass rod 30cm long and 1.5cm in diameter. The average coefficient of linear expansion of glass is 9 x 10^-6°C-1. If the temperature of the rod increases by 65°C, what is the increase in its volume?
April 28, 2011

statistics--need formula for the following
stuck on steps 2 and 4 of hypothesis testing. Need a formula to complete. please help... A researcher theorized that people can hear better when they have just eaten a large meal. Six individuals were randomly assigned to eat either a large meal or a small meal. After eating ...
April 17, 2011

PHYSICS
An object is attached to an ideal spring. It undergoes a simple harmonic motion with a total energy of E = 2.2 J. The amplitude of the motion is 0.7 m and the maximum speed of the object is 0.5 m/s. Find the spring constant.
April 7, 2011

PHYSICS
An object undergoes simple harmonic motion. During that motion the object needs 1.1 seconds to reach one point of zero velocity from the previous such point. If the distance between those points is 0.3 m, calculate the period.
April 7, 2011

science
write a brief paragraph that tells how the words matter,element,atom,crystal,compound,and molecule relate.
April 6, 2011

science
Compare table salt with glucose.
April 6, 2011

biology
hahaha oh no you dont cheater... this is YOUR hw for a reason :p
March 23, 2011

computer science
aready look there didnt help
March 17, 2011

computer science
Should the navigation elements in multiple locations on a page be identical? Why or why not?
March 17, 2011

physics
A stereo speaker represented by P in Figure 13-22 emits sound waves with a power output of 130.0 W. What is the intensity of the sound waves at point x when r = 7.8 m? W/m2
March 12, 2011

physics
What are the first three harmonics of a note produced on a 31.0 cm long violin string if waves on this string have a speed of 277.0 m/s? Hz Hz Hz
March 12, 2011

eng
Where Do You Normally Find Information For Topics That Interest You How Do You Know When Sources Are Reliable Explain Your.
February 28, 2011

AP Biology
the process of making a complimentary copy of the DNA to form RNA is called?
February 23, 2011

Chemistry
Am i right? I'm a little confused by this problem
February 23, 2011

Chemistry
Seawater contains 0.412 g Ca per kilogram of water. What is the number of moles of Ca per kilogram of water? What is the concentration of Ca measured in ppm? For the first question, it's changing the grams of Ca to moles of Ca. Is it .412 g / 39 g = .0105 moles. For the ...
February 23, 2011

chemistry
whats the answer here?what is the solution?plis
February 22, 2011

Chem
I'm confused with Determining the concentration of a soution: beer's law lab. 1.Explain why pure water is set for a transmittance of 100%. - I believe the pure water is set for a transmittance of 100% in order to for a tranmission relative to water 2. Explain why red ...
February 22, 2011

Science
What is the mass of saturated solvent of Potassium nitrate at 80degress in 100g of water
February 8, 2011

COMPUTER SCIENCE
What are the most important considerations in planning for navigation within a tutorial?
February 6, 2011

Communications
What artists and bands have had the greatest effect on popular culture? Explain why? Do you think the changing genre of popular music influences culture of time? If so, explain how? If not, explain why not? (Last 30 years)
January 20, 2011

computer science
no
January 15, 2011

computer science
Choosing the right audience is important. What might happen if it is not done right? What kind of issues can it cause to your project?
January 15, 2011

computer science
which is better live support or email?
January 13, 2011

Math
I don't know.i think I
January 12, 2011

physics
A 1.o kg cart A and 2.0 kg cart B are at rest on a frictionless table. A cord and a spring of negligible mass join the two carts. The spring is compressed 0.060m between the two carts until the spring's potential energy is 12 Joules. When the cord is cut, the spring will ...
January 9, 2011

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