Wednesday
September 3, 2014

Posts by Sam


Total # Posts: 3,946

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

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

Math
how to solve polynomiels?
February 11, 2013

Pre Algebra
I have to design new dice for a board game. I have to use two standard cubes each with six faces and number then in such a way the the probability of rolling the numbers 1-12 are the same
February 11, 2013

Math
Write a number sentence. Marshall sleeps 8 hours each day. How many hours does Marshall sleep in one week? How many hours is Marshall awake each day
February 11, 2013

physics
A crane is used to hoist a 500kg crate vertically at a constant velocity of 4 meters per second. Ignore the effects of friction. a) calculate the magnitude of the net force experienced by the crate b) calculate the magnitude of the force applied by the cable on the crate
February 11, 2013

math
how many square feet are there in an area of 1.00 square meters(1ft=0.305m)?
February 10, 2013

geometry
Got it! A) Write a variable expression for the area of the picture. x² <==ANSWER B) Write a variable expression for the total area of the poster. (x + 15)(x + 6) <==ANSWER C) Use your solutions to parts A & B to write a variable expression for the area of the border...
February 8, 2013

geometry
a poster art exhibition is to display a square picture with a white border around it. The border must be 10 in. wide at the bottom, 5 in. wide at the top, and 3 in. wide on each side. Using x to represent the length of a side of the picture. A) Write a variable expression for ...
February 8, 2013

Solving linear equations
You need to look at the differences between each number. At some point a pattern will repeat, and you follow the differences to determine the next number in a sequence. Do you have an example you can post? Example: 2,5,6,8,11,12 The difference between 2 & 5 is 3 The difference...
February 8, 2013

math
how many square feet are there in an area of 1.00 square meters(1 ft=0.305)
February 8, 2013

Chemistry
At a certain temperature, the solubility of gas in water at 2.04 is 48.0 . Calculate the solubility of gas in water, at the same temperature, if the partial pressure of gas over the solution is increased from 2.04 to 6.00 .
February 8, 2013

physics
From a height of 2.15 m above the floor of Boston's Fleet Center, forward Paul Pierce tosses a shot straight up next to the basketball hoop with a KE of 5.40 J. If his regulation-size. basketball has a mass of 0.600 kg, will his shot go as high as the 3.04 m hoop? Use the ...
February 7, 2013

world history
The development of an atomic bomb by the United States did which of these? A. pressured German leaders to surrender B.increased tensions between Truman and Stalin C. worried the leaders of France and Great ritain D.led Stalin to postpone a Soviet invasion of Japan
February 7, 2013

U.S History
The development of an atomic bomb by the United States did which of these? A. pressured German leaders to surrender B.increased tensions between Truman and Stalin C. worried the leaders of France and Great ritain D.led Stalin to postpone a Soviet invasion of Japan
February 7, 2013

Math
How to divide4/5 divide 7/8
February 5, 2013

Algebra 1 I need help!!!!!!!!!!!!!!!!
8.A number raised to a negative exponent is negative. Is it always , never, or sometimes. 7. Evaluate 1/2a^-4b^2 a = -2 and b = 4 remember a^to the negative 4 6. Simplify. Write in scientific notation. (9 x 10^-3)^2 Thanks to anyone who helps right away and need right answer ...
February 4, 2013

Physics
A particle is traveling in a straight line at a constant speed of 28.5 m/s. Suddenly, a constant force of 12.0 N acts on it, bringing it to a stop in a distance of 61.9 m. (a)Determine the time it takes for the particle to come to a stop. s (b) What is its mass? kg
February 4, 2013

math
The graph of a function is horizontally compressed by a factor of 5 and vertically compressed by a factor of 2 Find an equation for this compressed function in terms of the function f(x)
February 4, 2013

Calculator Question
how do I input ln7/ln2/5600 correctly in my calculator to get 2900 as my answer?
February 4, 2013

Chemistry
What is the activity coefficient of H^+ in a solution containing 0.073 M HCl and 0.0090 M Ca(ClO4)2? What is the pH of the solution? I believe I have to find the ionic strength of the solution first, but I don't know how to find it when 2 solutions are involved.
February 4, 2013

Chemistry
Thank you! That was the correct answer. Plus I finally figured out why that was the correct answer :)
February 4, 2013

Chemistry
Complete the charge balance equation for an aqueous solution of H2CO3 that ionizes to HCO3^- and CO3^2- ______ = ______ + _______ + _______ Given choices: [HCO3^-],[CO3^2-], [OH^-], 2[H^+], [H2CO3], 2[CO3^2-], 3[H^+], {H^+] I don't understand how to do charge balance :(
February 4, 2013

Chemistry
Thank you for answering! I got .0099 for the ionic strength. I just don't understand how to calculate the activity coefficient though. We just learned the concept and I'm confused.
February 4, 2013

Chemistry
Find the Concentration of CrO4^2- in 0.0033M Ba(NO3)2 saturated with BaCrO4. Include activity coefficients in your solubility-product expression. Ksp of BaCrO4 = 1.17 x 10^-10 I have no idea what to do to solve this :(
February 4, 2013

physics
Tarzan swings through the jungle by hanging from a vine. At the lowest point of a swing, Tarzan's acceleration is.... A. zero B. not zero C. one cannot be sure whether it's zero or not zero without additional information.
February 2, 2013

math
Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 4y = -4x - 4 A) no solution B) (0, -1) C) (-1, 0) D) infinitely many solutions
January 31, 2013

Health
what 2 categories does ecstasy belong to? Name five body organs that can be damaged by drug abuse?
January 30, 2013

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