Sunday
November 23, 2014

Posts by Sabrina


Total # Posts: 459

CHEMISTRY
Ethylamine, CH3CH2NH2, is an organic base with pKb = 3.367 at 298 K. In an experiment, a 40.0 mL sample of 0.105 mol L-1 CH3CH2NH2 (aq) is titrated with 0.150 mol L-1 HI(aq) solution at 298 K. (a) Write a balanced chemical equation for the neutralization reaction upon which ...
November 27, 2012

CHEMISTRY
The half-cell, Tl | Tl+(1 mol L-1), is connected to a Pt | H+ | H2(1 atm) half-cell in which the concentration of H+ is unknown. The measured cell voltage is 0.0841 V and the Pt | H2 | H+ half-cell is the cathode. Standard reduction potentials are given on the next page. (a) ...
November 27, 2012

social studies
Which of the following nineteenth-century inventors is associated with Menlo Park in New Jersey a.Gustavus F. Swift b.Cyrus W. Field c.Alexander Graham Bell d.Thomas Alva Edison
November 23, 2012

social studies
If you were a reform-minded person who, above all, loathed the social problems associated with alcohol, you would have been especially sympathetic to the
November 23, 2012

Physics
A speed skater moving across frictionless ice at 9.0 hits a 5.1 -wide patch of rough ice. She slows steadily, then continues on at 6.4 . What is her acceleration on the rough ice?
October 8, 2012

advanced algebra
ms. driva reck drove from her home to a service station at 48 km/h. she returned home by bike at 16 km/h. the entire trip took 4 hours. How far was the service station from ms. reck's home?
October 4, 2012

3rd grade Math
2468101214161820222426283032343638404244464850525456586062646668707274767880828486889092949698100
October 2, 2012

chemistry
Which of the following elements is synthetic? uranium iodine helium nobelium
September 25, 2012

chemistry
How many electrons are in the outermost principal energy level of an atom of nitrogen in the ground state?
September 25, 2012

MEDICAL RECORD
WHAT IS THE PROCESS FOR HANDLING CLINICAL DAT THAT A DOCTOR NEEDS TO SEE AND WHAT IS THE PROCESS FOR HANDLING ADMINISTRATIVE DATA THAT A DOCTOR DOES NOT NEED TO SEE
August 31, 2012

maths
Can someone help please? A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen
August 27, 2012

maths
i have worked out the diameter of the umbra to be 25 cm, is this correct?....
August 27, 2012

maths
please help A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen
August 27, 2012

math
a circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. Ascreen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen. Ok, I have drawn a sketch and can say that the ...
August 27, 2012

math
thanks for your help
August 27, 2012

math
Need help..... A child of height 1.2 metres stands 3 metres from the foot of a lamp post of height 2.8 metres, at the top of which there is a small source which can be considered as a point. What is the length of the shadow cast by the child upon the ground?
August 27, 2012

physics-please help
could i have a clue or a starting point please?
August 27, 2012

physics-please help
can someone help? i am really struggling
August 27, 2012

physics-please help
is it D/5.8= 1.2/2.8 D= (5.8x1.2)/2.8 D= 2.48m ??
August 27, 2012

physics-please help
A child of height 1.2 metres stands 3 metres from the foot of a lamp post of height 2.8 metres, at the top of which there is a small source which can be considered as a point. What is the length of the shadow cast by the child upon the ground?
August 27, 2012

following previous question
thank you
August 27, 2012

following previous question
would what the nature of the shadow on the floor be if the point of source of light is replaced by a luminous disc of diameter 5 cm, whose centre lies directly above the centre of the card?
August 27, 2012

OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!
thank you what would the dimension of shadow be?
August 27, 2012

OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!
thank you would what the nature of the shadow be if the point of source of light is replaced by a luminous disc of diameter 5 cm, whose centre lies directly above the centre of the card?
August 27, 2012

OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!
WHAT DOES PI STAND FOR?
August 27, 2012

OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!
THANK YOU!
August 27, 2012

OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!
A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?
August 27, 2012

OPTICS
PLEASE HELP! A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?
August 27, 2012

maths/physics
PLEASE HELP! A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?
August 27, 2012

maths/physics
PLEASE HELP! A POINT SOURCE OF LIGHT IS PLACED 50 CM ABOVE A CIRCULAR CARD OF DIAMETER 5CM, THE SOURCE BEING DIRECTLY ABOVE THE CENTRE OF THE CARD. WHAT IS THE AREA OF THE SHADOW ON THE FLOOR 70 CM BELOW THE CARD?
August 26, 2012

science
980
July 28, 2012

chemistry please help me please!!!
When one student did this experiment, he started with 19.5 mL of 0.118 M monoprotic acid. The endpoint was reached when 17 mL of base was added. What was the concentration of the base?
July 9, 2012

Geometry
AC and AE are common external tangents of circle G and circle D. FE = 26, GF = 5, and AG =13. What is the measure of AC?
June 24, 2012

Language Arts
Thanks
May 17, 2012

Language Arts
Who is Anmol? and I don't know
May 17, 2012

Language Arts
Seemingly virtuous; showing religiuos devotion P _ O _ S
May 17, 2012

Language Arts
uuummmm okay
May 17, 2012

Language Arts
Thanks...so you're who Ms.Sue was talking about?
May 17, 2012

Language Arts
Who is Anmol? and I don't know
May 17, 2012

Language Arts
Easy to manage or discipline D _ _ _ L _
May 17, 2012

algebra
factoring completely: 36x^2 + 60x +25
May 15, 2012

6th Grade Math
PLEASE HELP ME!!!!! I need to answer this equation: 9/2m-8=-5.5+4m I need it answer in a way like this: Ex: 9+5k=45+2k 0peration S 9 5k=36+2k S 2k 45+2k D 3 k=12
May 7, 2012

statistics
A professor informs her class that a test is very difficult, but the grades will be curved. Scores for the test are normally distributed with a mean of 25 and a standards deviation of 5. If she curves the grades by adding 50 to each grade, What is the new mean? What is the new...
April 28, 2012

Math😒
How do you find the answer to 3.4 - 0.972
April 26, 2012

statistics
Thank you.. It is 0.1008..
April 24, 2012

statistics
A history professor finds that when he schedules an office hour at the 1030 am time slot an average of 3 students arrive. Use the poisson distribution to find the probability that in a randomly selected office hour in the 1030 am time slot exactly 5 students will arrive.
April 24, 2012

statistics
A test has a mean of 104 and a standard deviation of 16. We want to be 98% certain that we are within 4 points of the true mean. Determine the sample size.
April 23, 2012

statistics
I thought that was it. It just seemed to easy. Thanks
April 23, 2012

calculus
malachi has three tvs of: 25",27",32". what the average size of malachi tvs?
April 22, 2012

FLORIDA STUDIES WEEKLY
WHATS THE ANSWER TO #7 DOWN
April 15, 2012

Chemistry
-1045
April 9, 2012

statistics
A person can order a new car with a choice of 9 possible colors, with or without ac, with or without heated seats, with it without anti lock breaks, with or without power windows and with or without a CD player. How many different ways can a new car be ordered with these ...
March 25, 2012

Chemistry
If a sugar cube measured 20cm by 20cm how much surface area would be exposed to the solvent(water)
March 18, 2012

math
a map of the moon has a scale of 1cm:25km. On this map the diameter of the Copernicus crater is about 3.7 cm. To the nearest kilometer, what is the actual diameter of the crater?
February 8, 2012

math
express using a positive exponent: c^-5
February 3, 2012

Physics (Mechanics)
Marie shoots an arrow vertically upward at a sandhill crane. If the arrow travels to a maximum height of 99.5 meters, calculate how fast it was shot. And, for how much time was Marie's arrow in the air?
January 28, 2012

com172
Review the following passage and paraphrase it in the following box. Use the reference to create an appropriate APA-formatted in-text citation. Additionally, include one direct quotation. One of the most valuable skills a student can develop is focus. Focus is the ability to ...
January 22, 2012

physics
Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 4 seconds down a ramp at an acceleration of 3 m/s2.
December 23, 2011

Algebra
I'm not sure how to get started! Please help! y=-2x^2-12x+2 Find the vertex, y intercept and x intercept
December 5, 2011

English 10
In the autobiographical selections "Hair" and "It Can't Be Helped," the authors describe how racial prejudice affected their early lives. Identify the key event described in each of the selections. Then explain how each author responded to the event at ...
November 3, 2011

MAth grade 8
i dont now wtf so get over it figer it out
October 26, 2011

business math
Is it more economical to buy an automobile for $29,000 cash or to pay $4,500 down and $3,000 at the end of each quarter for 2 years, if the money is worth 8% compounded quarterly? What is the cash equivalent savings by picking the better plan?
September 28, 2011

Finance
Is it more economical to buy an automobile for $29,000 cash or to pay $4,500 down and $3,000 at the end of each quarter for 2 years, if the money is worth 8% compounded quarterly? what is the cash equivalent savings by picking the better plan?
September 28, 2011

Finance
Is it more economical to buy an automobile for $29,000 cash or to pay $4,500 down and $3,000 at the end of each quarter for 2 years, if the money is worth 8% compounded quarterly?
September 28, 2011

Physics
An aircraft has a landing velocity of 50 ms-1 and decelerates uniformly at 10 ms-2Calculate: (a) the time taken to reach 15 ms-1 (b) the distance travelled during this time (c) the velocity of the car when it was 100 m from the start point
September 22, 2011

engineering
How has hydraulic engineering altered local and regional environments?
July 31, 2011

self reflective essay
I want to know can I write about myself in a self reflective essay ,,here is my thesis statement do you think it is ok? In this paper I will argue the life of a child being born in a divorced family was it easier or was it very hard?
July 17, 2011

math
Using Torricelli's Principle, it can be shown that the depth d of a liquid in a bottle with a hole of area 0.5 cm2 in its side can be approximated by d = 0.0034t2 − 0.52518t + 20, where t is the time since a stopper was removed from the hole. When will the depth be ...
July 12, 2011

math
The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height in feet, v0 is the initial velocity, and t is the time in seconds. Find the time for a projectile to reach a height of 96 ft if it has an initial velocity of 128 ft/s. ...
July 11, 2011

math
A model rocket is launched with an initial velocity of 250 ft/s. The height, h, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 250t. How many seconds after launch will the rocket be 730 ft above the ground? Round to the nearest hundredth of a ...
July 11, 2011

math
A model rocket is launched with an initial velocity of 250 ft/s. The height, h, in feet, of the rocket t seconds after the launch is given by h = −16t2 + 250t. How many seconds after launch will the rocket be 730 ft above the ground? Round to the nearest hundredth of a ...
July 11, 2011

social psychology
Women have lower self esteem than men. Discuss how personal attitudes can affect or promote self-esteem, citing two (2) specific examples for each gender
July 10, 2011

social psychology
yes ms.sue i would like you to like me with it thank you
July 10, 2011

social psychology
3. Perceiving yourself to be a target of discrimination and prejudice can affect you negatively. Citing two (2) examples of each, explain how this may happen 4. Images of a new self can motivate us to change. Identify a “Desired Possible Self” and describe the ...
July 10, 2011

social psychology
Women have lower self esteem than men. Discuss how personal attitudes can affect or promote self-esteem, citing two (2) specific examples for each gender
July 10, 2011

History
2. What was the Confucian definition of a gentleman? Why did Confucianism place so much emphasis on manners and ceremony?
June 7, 2011

Math
Which theorem or postulate states that if the hypotenuse and an acute angle of one right triangle are congruent to the hypotenuse and corresponding acute angle of another right triangle, then the triangles are congruent?
June 5, 2011

Math
The segment that bisects an angle of the triangle and has one endpoint at a vertex of the triangle and the other endpoint at another point on the triangle is called the _________. The segment that has one endpoint at one of the vertices of a triangle and its other endpoint on...
June 3, 2011

algebra
How many ways can the offices of president, vice-president, treasurer, secretary, parliamentarian, and representative be filled from a class of 30 students?
May 30, 2011

algebra
Yolanda's yogurt house offers 3 different kinds of yogurt and 13 different kinds of toppings. How many different yogurt and topping combinations are possible?
May 30, 2011

elementary math
Sabino took the ACT in 2003 and received a composite score of 22. If the mean and standard deviation for that year were, respectively, 20.8 and 4.8, what percent of all of the students who took the exams scored better than him?
May 16, 2011

chemistry
How many grams of sodium cyanide would be required to make 55 grams of sodium sulfate?
May 15, 2011

biology pleaseehelp!
In order to produce many copies of a protein fast, the cell uses A. DNA replication. B. intron self-splicing. C. single-unit ribosomes for high speed translation. D. codon-anticodon reciprocal duplication. E. many RNA polymerase molecules to produce mRNA transcripts at the ...
May 13, 2011

Grade 12 Biology
If a life-form has six different bases-ABCDEFG. the percentage composition of A,B and C is same as EFG. Hypothesis the structure of the nucleic acid. I TRIED the search engine but didnt help, please help!
May 9, 2011

Grade 12 Bio Please try to help me
If a life-form has six different bases-ABCDEFG. the percentage composition of A,B and C is same as EFG. Hypothesis the structure of the nucleic acid.
May 9, 2011

math
Jim wants to deposit money in an account to save for a new stereo system in two years. He wants to have $4,000 available at the time. The following rates are available to him: 6.2% simple interest 6.1% compounded annually 5.58% compounded semiannually 5.75% compounded ...
April 25, 2011

social studies
why may a historian call Niccolo Machiavelli "The firsmodern Italian
April 17, 2011

american history
What Civil War general replaced Hooker as commander of the army of the Potomac in June of 1863?
April 14, 2011

Human Resources Management
Sekect two aspects of a performance appraisal from the list below. Explain what each aspect is. State the effects on employees and employers if the aspects were not addressed. Strategic Relevance Criterion deficiency Criterion contamination Reliability Compliance with the law ...
March 30, 2011

math 6
What is the volume of trapezoid and area?
March 20, 2011

biology
all test crosses are back cross. but all back crosses are not test cross. justify the statment
March 19, 2011

Biology
thank u soo much :)
March 17, 2011

Biology
why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...
March 17, 2011

BIOO
why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...
March 17, 2011

BIOO pleasee help u guys are angellss!!!
why is there no production of ATP when detergent is treated in a test tube with mitochondria? in Aerobic and anaerobic respiration what is the final metabolic breakdown of molecule? 1 pyruvic acid 2 acetyl coenzyme A 3 citric acid 4 reduced coenzyme FADH2 5) ATP PLEASSEEEEEEEE...
March 17, 2011

History
What is the role of the United States in the emerging global community?
March 2, 2011

Chemistry
If the surface area of a liquid is increased will the rate of evaporation increase?
February 27, 2011

8th grade math
Point A=(5,-2) was translated to point A'=(-3,6). Describe the translation.
February 17, 2011

fifth grade math
40%
February 10, 2011

business math
plug in 6.4 as the % and $1,000 as the deposit
February 9, 2011

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