# Posts by joanna

Total # Posts: 168

Chemistry
In the reaction,C2H4(g) + 3O2(g) =2H2O(g) + 2CO2(g),what is the complete combustion of 12.5cm3 of ethene

chemistry
Moles chemistry? Calculate the mass of solute required to prepare ib the solution 200cm^3 of solution containig 0.50 mol dm ^-3 cl-iond prepared by dissolving cacl2.6h2o in water.

chemistry
Find the number of moles in 12×10^24 CO2 molecules 1mole is equal to 6.0×10 ^23 ? 12x10^24 Then division of them but the answrr did not match the answer of the book

Calculus
an experimental farm has 3600 ft. of fencing to create a rectangular area that will be subdivided into 4 equal subregions, what is the largest total area that can be enclosed?

home economics
I ain't know I could be anything maybe it had something to do with careers or some other technical stuff. Not because its home economics means u just go around sewing and cooking it more to it than that. And I have to admit my teacher told me so its likely that I am riggt

Chemistry
Estimate the value of the equilibrium constant at 500 K for each of the following reactions. 2H2S(g)⇌2H2(g)+S2(g) I have calculate my delta H which is 168.9 kj/mol but I don't know where to go from there

physics
Use conservation of energy to determine the angular speed of the spool shown in the figure below after the 3.00 kg bucket has fallen 4.05 m, starting from rest. The light string attached to the bucket is wrapped around the spool and does not slip as it unwinds. rad/s

physics
Question Part Submissions Used A 11.5-kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 10.9 m/s, determine the following. (a) the translational kinetic energy of its center of gravity J (b) the rotational kinetic ...

physics
A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 270 N applied to its edge causes the wheel to have an angular acceleration of 0.854 rad/s2. (a) What is the moment of ...

physics
The large quadriceps muscle in the upper leg terminates at its lower end in a tendon attached to the upper end of the tibia (see figure (a)). The forces on the lower leg when the leg is extended are modeled as in figure (b), where vector T is the force of tension in the tendon...

physics
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 16.0 m/s. The cliff is h = 25.0 m above a flat horizontal beach, as shown in the figure below. How long after being released does the stone strike the beach below the cliff? s...

physics
A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (answer in m/s^2) (b) Assuming the acceleration is constant, find the distance the plane moves. answer ...

physics
A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground? answer in (in seconds)

physics
A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (in meters) (b) How long does it take to reach its highest point? (in seconds)

physics
the answer is not 3.51 seconds when i type in the answer it doesn't work

physics
A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground?

Pre Calc
Solve 2 sin^2 x-3 sin x+1 =0, 0 less than or equal to x < 2pi

Pre Calc
Find cos 2A if tan A = 5/12 and <A lies in quadrant III.

Math
trust me i don't do this to get the answers only when i need help! once again TY!

Math
THANK YOU SOO MUCH YOU ARE A LIFE SAVER

Math
HELP! do we divide 10 1/2 and 9 1/2 by 1/2 or do we add those two numbers than divide

Math
YES

Math
Tony is making half-pound bags of trail mix for a camping trip with his scout troop. He has 101 /2 pounds of peanuts and 91 /2 pounds of raisins. How many bags of trail mix can he make in all?

math
Shelly and her friend wanted to simplify a question 3/9 and 16/22 they didn't know how, but all they had to do is divide 3/9 and 16/22 with the clocest factor they can. The answer for 3/9 is 1/3 and the answer for 16/22 is 8/11 easy.

Math
2+3

MATH
In Mrs.Marshall'd classroom, 6/7 of the students play sports. Of the students who play sports, 4/5 also play as instrument. If there are 35 students in her class, how many play sports and an instrument?

MATH
I don't get it. At all. HELP!! ¤Ð-¤Ð 😭 Jenna lives 4 3/10 miles from school. She estimates that she travels 4¡¿2¡¿5, or 40 miles each week. Is her estimate an overestimateor an underestimate? EXPLAIN!!!!

MATH
Show three ways to estimate 3/5 ¡¿ 9 1/2. Identify each method you used.

Physics
A simple pendulum has mass 1.14 kg and length 0.760 m. (a) What is the period of the pendulum near the surface of Earth? (b) If the same mass is attached to a spring, what spring constant would result in the period of motion found in part (a)?

math
I flip a fair coin seven times in a row. What is the probability that I get at most five heads?

Math, Statistics
I know its 1 - P(5/128) but I don't think its correct?? I flip a fair coin seven times in a row. What is the probability that I get at most five heads?

math
Let A and B be events such that P(B)=0.28, P(B|A) =0.44 and P(A or B)=0.63, What is P(A)

math
I have a bag that contains 10 red marbles, 9 green marbles, and 6 blue marbles. I reach into it and take one marble at random. Keeping that marble, I reach into the bag again and take a second marble at random. a. What is the probability that the first marble is green and the...

Physics
A 6.5-kg bowling ball thrown with a speed of 5.4 m/s hits a stationary 1.75-kg pin. What is the velocity of each object? Assume that the coefficient of restitution is 0.75.

crime control model
•How do advocates of the crime control model view plea-bargaining?

juvenile deliquency
that does not provide any information

juvenile deliquency
What is a sub-cultural issue that is most proematic in causing juvenile delinquency

criminal justice
examine the public policy of the exclusionary rule with respect to the 5th Amendment requirement of self-incrimination. Your explanation should include an assessment of the major U.S. Supreme Court cases that have contributed to applying the rule to police interrogations. ...

criminal justice
To some, the victim's rights movement is more an exercise in symbolic politics than a substantive program. As a result, some critics argue that many of these programs are really more interested in severe punishment of the defendant than in helping victims adjust socially, ...

criminal justice
how each player in the criminal justice system impacts the decision-making process.

Microbiology
Autoclaving

law
this is the paper I need to do and I am not finding the information that I need: Your job is to create a section of a new employee handbook for police officers that highlights their constitutional rights and other rights afforded to them under the law. This section should ...

law
where do I find the constitutional rights that police officers have in Missouri

ethics
What are some ethical issues that a warden faces with the correctional officers and inmates

math
Consider the line 9x - 7y =4 What is the slope of a line parallel to this line? What is the slope of a line perpendicular to this line?

Chemistry lab reports online?
Are there any websites with other students' lab reports with calculations online? I do not want to copy and am completely against plagiarism. I just want to look at others' examples to help in giving me ideas on how to write my own and make sure I have enough ...

Math
67

law
How does the structure of the court determine the role of the defense lawyer?

law
How do “Other” crimes cause any estimated difference in classification of three-strikes arrests?

law
where can I find this information

law
How does prosecutorial discretion affect the overstating of laws on average sentencing?

law
where did you get this information from

law
Why did Congress repeal the mandatory federal sentences for drug offenses in 1970?

math
the challenge involves in dealing with the owner is to use a 20 meter fencing material to build a pig pen so that the owner will not be buying any additional materials considering also that one side of the pen is the outside wall of his garage? what is the dimension of this ...

accounting
. On June 1st, Green Pea, Inc. purchased \$1,200 worth of supplies on account. How does this transaction affect Green Pea's accounts? a. Increase supplies and accounts payable by \$1,200 b. Increase supplies and decrease cash by \$1,200 c. Increase supplies and decrease ...

Math
(i don't know if i posted but im just doing it again just in case) A 17 foot pipe is cut into three sections. The longest section is three times as long as the shortest and the middle sized section is two feet longer than the shortest. Find the length of each section to ...

Math
A 17 foot pipe is cut into three sections. The longest section is 3 times as long as the shortest and the middle sized section is 2 feet longer than the shortest. Find the length of each section to the nearest foot

english literature
How does The Misfit embody both verses of Matthew 12:35? "A good man from the goodness of his good heart brings forth good things; an evil man from the evilness of his evil heart brings forth evil deeds."

Chemistry
Compare and contrast the processes of nuclear fission and fusion, showing similarities and differences. Describe which, if any, of these processes is naturally occurring. If so, where?

statistics
1. 35% of North Americans do not think that college education is a contributory factor to economic success. A random sample of seven North Americans is selected

MATH
3/4

General Chemistry
How many milliliters of 0.5M NaOH must be added to 200 mL of 0.1M NaH2PO4 to make a buffer solution with a pH of 6.9?

Proportions
there were no brackets it was just written out as this well on mine it was. 3y-8/12=y/5 if anyone can help me id gladly appreciate it thankz

science
What is itvbarnoeso unscrambled ?

Precalculus
invests 7000 for 1 year part at 5% part at 11% and the remainder at 13% total amount of income from these investments was \$774. The amount of money invested at 13% was \$1200 more than the amounts invested at 5% and 11% combined find the amount invested at each rate

It means that numbers 2,3,7 have to be first so combination choose 3 out of 5 and then either 4 or 8 can be in the end which can be done in 2! ways. So 20ways out of possible 5!=120 so 20/120= 2/12=1/6

maths project
which ratio do you want? girls are 20 out of total 46 so 20:46 ie 10:23 and boys are 26:46 ie 13:23. Unless you want to find the ratio between girls and boys?

probabilities
Sorry I meant 5/9

probabilities
I got 4/5 but the answer in the book says something else. Am I correct?

probabilities
but Reiny it's WITH replacement!

probabilities
A bag contains 3 green balls. 2 red balls and a white ball. A boy randomly draws balls from the bag one at a time (with replacement) until a red ball appears. Find the probability that he will make at least 3 draws.

math
If there are only two possible outcomes from each trial then it's a binomial and by using the formula nCx p^x(1-p)^(n-x) we get; 5C4(1/3)^4(2/3)^1=0.04115

Algebra
let X be the amount she had in the beginning. x-2 after magazine On shoes she spent: (x-2)/2. For lunch she spent: (x-2)/4. She is left with (x-2)/4=12 <=> x-2=48<=> x=\$50

math

math
I have answered this question for Anderw

physics
A curve of radius 20 m is banked so that a 970 kg car traveling at 50 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s^2 Find the minimum speed at which a car can travel ...

Science
What happens when 1 Liter of Carbon Tetrachloride is poured into a container of Water?

Chemistry
the mass in grams 6.02x10^24 atoms Bi and 1.50x10^15 atoms U

medical records
how important is having the ability to read medical charts and reports? Why can abbreviations in charts be a cause of concern? How would you ensure that your staff and other health care professionals are proficient in medical abbreviations and terminology?

science
Which Windows feature allows you to personalize your computer system? A. My Pictures C. Default Programs B. Control Panel D. Computer

science
Which one of the following describes how to access your local disk in Windows XP? A. Click Start and click Control Panel. B. Click Start and click My Computer. C. Right-click on your desktop. D. Click Start and All Programs.

science
In Vista and Windows 7, which process allows you to display two documents side by side? A. Click the Windows button, choose Control Panel, and select the Tile Windows Vertically option. B. Right-click the mouse button in a blank area of the taskbar; in the menu option that ...

science
In Vista and Windows 7, which process allows you to change the desktop background? A. Click the Start button, choose Control Panel, and select Display Properties. B. Right-click on the desktop; in the menu that appears, select Display Properties. C. Click the Windows icon/...

science
In Vista and Windows 7, which process allows you to change the desktop background?

literature
. Which of these sentences uses grammar correctly? (Points : 1) Whom may I say is calling? Who may I say is calling? Whose calling?

physics
i need three project topics in physics. Help please

physics
1. A closed magnetic circuit of cast steel contains a 6cm long path of cross sectional area 1cm square and a 2cm part of cross sectional area of 0.5cm square. A coil of 200 turns is wound around the 6cm length of the circuit and a current of 0.4ampere flows. Determine the flux...

physics
i need three different project topic in physics

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...

physics
A volume of gas v at temperature T1 and pressure P, is enclosed in a sphere. It is connected to another sphere of volume v/2 by tube and stopcock. This second sphere is initially evacuated and the stopcock is closed. If the stopcock is now opened and the temperature of the gas...

computer packages
describe the following in not less than five sentence with examples. (1) rational database (2) schema

Geometry
each triangle is a 45 degrees-45 degrees-90 degrees.find the value x

physics
an ideal monatomic gas is allow to expand slowly until its pressure is reduced to exactly half its original value. By what factor those the volume changes if the pressure is (1)isothermal (2)adiabatic. Please is the answer suppose to be a calculation or an explanation

physics
an ideal monatomic gas is allow to expand slowly until its presssure is reduced to exactly half its original value. By what factor does the volume change if the pressure is (1) isothermal (2) adiabatic

physics
an ideal monatomic gas is allow to expand slowly until its pressure is reduce to exactly half its original volume. By what factor those the volume change if the process is (1)isothermal (2) adiabatic

algebra
suppose that the temperature at the end of the hiking trip is 42 degrees. write an equation to represent this situation

algebra
on average a child grows 2.5 inches per year from age 2 until adolescence. write an equation that shows how to calculate the height h of a child given the number of years y since age 2 if the child is 33 inches tall at at 2?

who invented.....
The first modern brassiere to receive a patent was the one invented in 1913 by a New York socialite named Mary Phelps Jacob

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