Thursday
November 27, 2014

Posts by Sam


Total # Posts: 4,077

Physics
A 3.6 kg ball strikes a wall with a velocity of 9.3 m/s. The ball bounces off with a velocity of 7.9 m/s in the opposite direction. If the ball is in contact with the wall for 0.4 seconds, what is the constant force exerted on the ball by the wall?
March 25, 2013

fundamental of management
young innovative or high tech firms often adopt the strategy of ignoring history of attempting to do something radically new.in what ways will this strategy help them?in what ways will this strategy hinder them/
March 25, 2013

management
young innovative or high tech firms often adopt the strategy of ignoring history of attempting to do something radically new.in what ways will this strategy help them?in what ways will this strategy hinder them/
March 25, 2013

physics
A 0.7 kg object is at rest. A 6.5 N force to the right acts on the object during a time interval of 3.7 seconds. What is the velocity of the object at the end of this interval?
March 25, 2013

math
I wold like to know if I have this answer right? Factor the trinomial competely. x^2-x-2 My answer is (x-2)(x+1)
March 24, 2013

math
Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 40 miles per hour during the return trip. What was Mark's average speed for the round trip?
March 24, 2013

math
After six biology tests, Ruben has a mean score of 73. What score does Ruben need on the next test to raise his average (mean) to 75?
March 24, 2013

Finite Math
The reading list for a literature class has 6 fiction and 8 nonfiction books. A student is to write a report on 5 books from the list during the semester. The report must include at least 1 and at most 4 reports of fiction books. In how many ways can the selection of books be ...
March 23, 2013

Math
I've read over it, but I still don't understand how to add together bulbs from the Mandelbrot sets. Please help? I need to know how to add the 1/4 bulb to the 1/6 bulb and the 1/8 bulb to the 1/6 bulb. Thank you!
March 22, 2013

Chemistry
A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in kilojoules per mole of KBr?
March 20, 2013

Calculus - Optimization
The cost of fuel for a boat is one half the cube of the speed on knots plus 216/hour. Find the most economical speed for the boat if it goes on a 500 nautical mile trip.
March 20, 2013

chemistry
if the molar mass of BaCl2 is 208.3 g/mol, how many grams are present in 0.25 moles?
March 19, 2013

math/ratios
8/10?
March 18, 2013

math/ratios
There are 77 students in the student council. The ratio of girls to boys is 7:4. How many girls are in the student council?
March 18, 2013

math/ratios
There are 77 students in the student council. The ratio of girls to boys is 7:4. How many girls are in the student council?
March 18, 2013

math
There are 77 students in the syudent council. The ratio of girls to boys is 7:4. How many girls are in the student council?
March 18, 2013

Algebra 1
Can you please help me with this question? I put parenthesis to make it look less confusing. (10)/(x)-(10)/(x-3)=(-3)
March 18, 2013

science help?
(a) One such reaction fuses two nuclei of carbon-12 ( 6 12C ) to form an atom of neon ( 10 20Ne ) with the emission of an α-particle. Write an equation for this process, indicating the atomic number and mass number of each of the products in the usual way. (b) Another ...
March 18, 2013

PLEASE HELP. LANGUAGE ARTS.
14. touch 17. A or D?? 18. developing more confidence 19. matter-of-fact
March 15, 2013

PLEASE HELP. LANGUAGE ARTS.
I will give the questions and my answers. Someone check it please. Read the passage below and answer the questions that follow. To the Top “Great works are performed, not by strength, but by perseverance.” -Samuel Johnson Have you ever wanted to give up on something ...
March 15, 2013

Language Arts
I will give the questions and my answers. Someone check it please. Read the passage below and answer the questions that follow. To the Top “Great works are performed, not by strength, but by perseverance.” -Samuel Johnson Have you ever wanted to give up on something ...
March 14, 2013

Chemistry
Indicate the concentration of each ion or molecule present in a mixture of 45.5 mL of 0.274 M NaCl and 65.5 mL of 0.0246 M (NH4)2CO3. Assume that the volumes are additive. [Cl-] [NH4+] [CO32-]
March 13, 2013

Chemistry
What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.25 M silver nitrate with 110.0 mL of 0.20 M calcium chloride? Calculate the concentrations of each ion remaining in solution after precipitation is complete. (Enter a 0 if none of the ion remains.) ...
March 13, 2013

Chemistry
Indicate the concentration of each ion present in the solution formed by mixing the following. Assume that the volumes are additive: 3.60 g of KCl in 76.5 mL of 0.274 M CaCl2 solution [K+] = [Cl-] =
March 13, 2013

Chemistry
Calculate the molarity of a solution made by dissolving 16.0 grams of Na2CrO4 in enough water to form exactly 555 mL of solution.
March 13, 2013

Physics
A man is standing on a cliff and throws a ball outward 50m/s at an angle of 53 degrees. It hits the base of the cliff in 10 seconds. Find: a) The height of the cliff b) the angle at which the ball goes into the sea c) if the ball will hit a boat 150m out to sea.
March 12, 2013

Physics
A ball is dropped from a height of 20m. When it bounces, it rebounds with a speed that is one half of the speed at which it hits the ground. How high does it bounce?
March 12, 2013

math
thank you. 15.25 x 190
March 11, 2013

math
JOHN is planting a garden. He wants to put a fence around it. If the garden is 3,000cm wide and 6,500 cm long, how much fence does he need? What will the cost be if fence is 15.25 per meter
March 11, 2013

science help?
no table and no diagram for this question a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?......... answer to unit ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?..............
March 9, 2013

help ??????????????????
no table and no diagram for this question a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?......... answer to unit ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?..............
March 9, 2013

science help?
a)What speed would water have to drop below to deposit a 250μm diameter grain of sediment?................ms^-1 b)What speed would water have to drop below to deposit a 500μm diameter grain of sediment?................ms^-1
March 9, 2013

grammar
thank you
March 8, 2013

grammar
object of preposition?
March 8, 2013

grammar
preposition?
March 8, 2013

grammar
For whom should we ask? IS whom subject ,object of preposition or dir ect object?
March 8, 2013

grammar
thank you
March 8, 2013

grammar
Everyone to whom she spoke smiled. Is whom the subject,object of preposition or direct object?
March 8, 2013

Physics
A 90kg stuntman falls from a building that is 80 meters tall. (Vo = 0)Fortunately, the stuntman is attached to a cable that is wrapped around a flywheel (massive spool), with a radius of 0.5m. If the man takes 8 seconds to reach the ground: (a) what is the moment of inertia of...
March 7, 2013

physics
A 90kg stuntman falls from a building that is 80 meters tall. (Vo = 0) Fortunately, the stuntman is attached to a cable that is wrapped around a flywheel (massive spool), with a radius of 0.5m. If the man takes 8 seconds to reach the ground, (a) what is the moment of inertia ...
March 7, 2013

math
thank you I UNDERSTAND IT NOW
March 7, 2013

math
ed needs to purchase 5.6 meters of tape. if each roll contains 80 cm and costs 5.00 what is the total cost of the tape ed must buy
March 7, 2013

english
in which sentence does the objective complement function as an adjective? a-while gardeners love rain, picnickers consider it a nuisance. b-skiers called the record snowfall incredible! c-the hurricane forecasters named the next storm Bob.
March 7, 2013

math
The scale factor of 2 similar polygons is 3:4. If the perimeter of the large polygon is 200, what is the perimeter of the small polygon?
March 6, 2013

math
9kids
March 6, 2013

Math
Understood thanks!
March 5, 2013

Math
How did you come up with that #?
March 5, 2013

Math
Yes how many dances
March 5, 2013

Math
There are 6 dancers in a program. Each dancer will preform a short dance with each of the other dancers before the program is over. How many dancers will there be
March 5, 2013

Math
There are 6 dancers in a program. Each dancer will preform a short dance with each of the other dancers before the program is over. How many dancers will there be
March 5, 2013

Math
If you have 2 3/4 ft purple ribbon and 2 1/2 ft of orange ribbon how many bows can be made? 1 bow uses 3/8 purple ribbon and 1/3ft of orange Ribbon. Divide amount have and amount needed
March 5, 2013

Reading
Not sure which answers to use.. please help: choose from these words: deficit, dissent,lucrative and agnostic.. 1& 2: My uncle decided to splurge and _____ with a country club because golf is his favorite_________.(Dissent & lucrative) 3 & 4 : Because my father_______s to make...
March 5, 2013

Analytical Chemistry
How many milliliters of 0.0560 M EDTA are required to react with 50.0 mL of 0.0170 M Cu^2+? With 50 mL of 0.0170 M Sc^3+? My work so far: (50mL)(0.0170mmol/mL)= 0.85 mmol Cu^2+ I'm not sure how to do the rest. Please help.
March 4, 2013

math
X=36"^2 X X=36"X X/X=(36"X)/X X/X=36" 1=36" no solution
March 3, 2013

Math
Volume cube = a^3 Surface Area cube = 6 a^2 cubed root of 12sqin= cubed root of a 2.28942848511sqin=a (6)2.28942848511sqin^2=31.4488962095 31.4488962095 x .5 cents=15.7244481048
March 3, 2013

algebra
A bus is traveling at a speed of 15 m/s^2. The driver approaches the same traffic light in another traffic lane. He does not brake, and continues at the same speed. Write an equation for the distance the bus travels in time (t) (Hint: At a constant speed, the acceleration is 0...
March 3, 2013

algebra
A truck traveling at 16 m/s is 24 meters behind the bus at t = 0. The equation d = -24 + 16t gives the position of the truck. At what time will the truck be the same distance from the intersection as the bus? What will that distance be?
March 3, 2013

GEN CHEM
hllo
March 3, 2013

algebra
let t = 0 be the point at which the car is just starting to drive and the bus is even with the car. Find the other time when the vehicles will be the same distance from the intersection.
March 3, 2013

algebra
let t = 0 be the point at which the car is just starting to drive and the bus is even with the car. Find the other time when the vehicles will be the same distance from the intersection.
March 3, 2013

algebra
Set the equations equal to each other so you can determine when the car and bus are the same distance from the intersection. Collect all the terms on the left side of this new equation., leaving 0 on the right side. Factor the expression on the left side of the equation.
March 3, 2013

algebra
A bus is traveling at a speed of 15 m/s^2. The driver approaches the same traffic light in another traffic lane. He does not brake, and continues at the same speed. Write an equation for the distance the bus travels in time (t) (Hint: At a constant speed, the acceleration is 0...
March 3, 2013

algebra
A car is stopped at a traffic light. The light changes to green and the driver starts to drive, accelerating at a rate of 4 m/s^2. Write an equation for the distance the car travels in time.
March 3, 2013

geometry
167.08 square inches. I need to know the radius of a circle for that number of square inches..
March 3, 2013

HELP PLEASE!!!!!!!
You go to a online school. This is a discussion for Social Studies. This question is the topic. Study the textbook.
March 1, 2013

Analytical Chemistry
A 22.617 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 70.407 g of water. A 10.883 g aliquot of this solution is then titrated with 0.1072 M HCl. It required 29.32 mL of the HCl solution to reach the methyl red ...
February 28, 2013

social studies
Stop being a dik on Jiskha
February 28, 2013

physics
when 1 g of gasoline is burned in an engine about 48 kj of heat is produced. how much mass is lost in the process? do you think this mass change could directly be measured?
February 28, 2013

physics
when 1 g of gasoline is burned in an engine about 48 kj of heat is produced. how much mass is lost in the process? do you think this mass change could directly be measured?
February 28, 2013

physics
is the work needed to bring a car's speed from 0 to 10 km/h less than, equal to ,or more than the work needed to bring its speed from 10 to 20 km/h? if the amounts of work are different ,what is the ratio between them?
February 28, 2013

Analytical Chemistry
its alright. I figured out the answer. thanks for your help! :)
February 27, 2013

Analytical Chemistry
I did not get the right answer by this method.
February 27, 2013

Analytical Chemistry
I apologize that the ice chart got smushed like this when i posted the problem.
February 27, 2013

Analytical Chemistry
Calculate the pH at the equivalence point for the titration of 0.160 M methylamine (CH3NH2) with 0.160 M HCl. The Kb of methylamine is 5.0× 10–4. Methylamine is a weak base and reacts with HCl to give the methylammonium ion. HCl + CH3NH2 <---> CH3NH3^+ + Cl^- ...
February 27, 2013

math
why does lxw=a work
February 26, 2013

Math
a group of 100 students took a quiz. Their average score was 76 points. If the average score for boys was 80 points and the average score for girls was 70 points, how many girls participated in the quiz
February 26, 2013

Analytical Chemistry
Show the predominant form of the amino acid tyrosine at pH=13.9 and ph=7.8. Be sure to include the proper number of hydrogens on heteroatoms and the correct formal charges on atoms. I calculated the pka values for COOH (pka=2.41) NH3 (pka=8.67), and OH (pka=11.01) but i'm...
February 26, 2013

Analytical Chemistry
You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.086 M NaOH. Next, you add 1.00 mL of 8.87 × 10-4 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine present in the form...
February 26, 2013

Analytical Chemistry
I got the answer, thanks!
February 26, 2013

Analytical Chemistry
What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 7.05? Not sure how to find k1 and k2 needed for the fraction formulas...please help :(
February 26, 2013

Literature
Repeated words, papragrapgh transition, conjunction sentences etc. Just want to make sure on my writing. I am in seventh grade. I don't want to copy and paste it on here in case other kids might use my writing. Other wise I would ask you to look at it. I wish.
February 26, 2013

Literature
Hi where can I find a free on line thing to check my writing ?
February 26, 2013

physics
Two spherical shells have a common center. A -2.00 × 10-6 C charge is spread uniformly over the inner shell, which has a radius of 0.050 m. A +5.50 × 10-6 C charge is spread uniformly over the outer shell, which has a radius of 0.15 m.
February 25, 2013

Math
Find the equation of the secant line to the graph of y= 2x^3-3x^2+4x-1 from x=1 to x=3. Give your answer in slope-intercept form.
February 23, 2013

Analytical Chemistry
Phosphoric acid is a triprotic acid with the following pKa values: pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.45. To do this, you choose to use mix the two salt forms involved in the second ionization, NaH2PO4 and ...
February 22, 2013

Analytical Chemistry
Yes I have online homework which I use to submit my homework on. I calculated H2CO3 and got the same value as yours. then I solved for x and got 2.3 x 10^-6 M. Finally i plugged it into the ph formula to get a ph of 5.64. Thank you so much! It was correct!
February 22, 2013

Analytical Chemistry
Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. CO2(g) <----> CO2(aq) The acid dissociation constants listed in most standard reference texts for carbonic acid actually apply to ...
February 22, 2013

History
I need help on how people influenced us. I am doing some history homework about the great depression (late 1920's through early 1940's) and I need some future connections like how did Duke Ellington influence us today? Or Walt Disney influence us today...ect. I can'...
February 20, 2013

life orientation
What according to the basic conditions of employment act applies wwith regard to contraventions
February 20, 2013

biology helppppppppppppppp
(This homework question has been removed due to a copyright claim submitted by The Open University.)
February 20, 2013

English
well i am trying thanks anyway!
February 16, 2013

English
incentive,incorporate
February 16, 2013

English
AS Leo explained a failed business deal that had once_____e(d) him,he______(e)d into the even more interesting tale of his romance with Molly, his business partner. My answers:rigor, curtail Is this correct?
February 16, 2013

english
which word would be the best word to use in this sentence... My aunt has only______success in quitting smoking.Every few monthsshe ____sto temptation,and then she has toquit all over again. succomb and curtail..Is this correct?
February 16, 2013

English
Thanks for your help!
February 16, 2013

English
1.squander 2.digress 3.rigor 4.incentive 5.devastate 6.succumb 7.indispensable 8.incorporate 9.curtail 10.intermittent
February 16, 2013

biology help?
In 1857, Louis Pasteur discovered that yeast is a living organism. The activity of yeast causes fermentation – baker’s yeast, Saccharomyces cerevisiae, has been used for centuries in the production of bread, beer and wine. In the absence of oxygen, yeast is able to ...
February 15, 2013

Math on graphs
If 30 3rd graders owned birds, how many third graders were surveyed? Reptiles 5% Birds 5% Fish 10% Cats 35% Dogs 45% I did 5% of 30 = .05 x 30 = 1.5 30/1.5 = 20 third graders BUT I am thinking I am doing something wrong? Where did I go wrong? Should it be 30/.05 = 600 students...
February 14, 2013

Math help ??
Oops I meant 30 third graders.
February 14, 2013

Math help
If 20 3rd graders owned birds, how many third graders were surveyed? Reptiles 5% Birds 5% Fish 10% Cats 35% Dogs 45% I did 5% of 30 = .05 x 30 = 1.5 30/1.5 = 20 third graders BUT I am thinking I am doing something wrong? Where did I go wrong? Should it be 30/.05 = 600 ...
February 14, 2013

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