Saturday
December 20, 2014

Posts by Alex


Total # Posts: 2,735

science
laboratory connects a 16§Ù resistor, 23§Ù resistor, and a 34§Ù resistor in series and then comes the arrangement to a 36V dc source. How much current is in the circuit?
December 17, 2011

science
what are the forces on two charges of +0.44c and +2.4c, if they are separated bu=y a distance of 3.16cm? repel or attract each other?
December 16, 2011

Chemistry
Oops the charges in the equation got messed up so instead: MnO4- + 5Fe2+ + 8H+ -> 5Fe3+ + 4H2O
December 15, 2011

Chemistry
I had tremendous problems with this question as well, and since I now have the answer, I'll spread the love. First, you figure out how many moles of KMnO4 is used for both titrations using the equation ---- M=(mol)/(L) ---- (M=Molarity) Doing this, you would get the first ...
December 15, 2011

math
That question can't really be answered unless we can see the string
December 13, 2011

5th grade math
seven trillion six hundred fifty four billion three hundred twenty one million one hundred fifty eight thousand nine hundred six
December 12, 2011

5th grade math
Figure out what each place value the numbers are in
December 12, 2011

biology
A dominant gene V in humans causes certain areas of the skin to become depigmented, a condition called "vitiligo." Albinism is the complete lack of pigment production and is produced by the recessive genotype aa. The albino locus is epistatic to the vitiligo locus. ...
December 12, 2011

statistics
for a certain psychiatric evaluation z scores above 2.18 and below -2.33 are considered abnormal. what is the probability that a person evaluated by this will be considered normal?
December 11, 2011

science
place in order of increaseing nonmettalic character: Se, Po,and O. Can you explain how to do this?
December 11, 2011

SCIENCE
ORDER OF INCREASING ATOMIC SIZE: Cs, Li, and Rb
December 11, 2011

calculus II
Using integration by substitution. find the exact value of integral from [0,9/16] sqrt(1 - sqrt(x))/(sqrt(x))
December 10, 2011

Top Schools
Do what you want. Cause high school gets you into a college you want It depends on what you want to be when you grow up
December 9, 2011

physics
Calculate the difference between the magnitude of the gravitational force and the magnitude of the normal force exerted on a 100 kg object at the equator. Which of the two forces is equal in magnitude to the weight of the object?
December 5, 2011

precalc
Determine whether the sequence is geometric or arithmetic. Then give the general formula for the nth term of the sequence. 6.1, 6.9, 7.7, 8.5, 9.3,... I think it is Geometric, but i don't know how to find the formula
December 5, 2011

math
Is f(x)=4x/x-1 in factored form
December 4, 2011

precalc
Use Sigma Notation to write the sum [10-(1/10)^2]+[10-(2/10)^2]+[10-(3/10)^2]+[10-(4/10)^2]
December 4, 2011

3rd grade math
How can you use mental math to multiply 800 x 5?
November 29, 2011

3rd grade math
Marcia said that if she estimates 73 x7, the product will be less than the exact answer. Is she correct? Explain.
November 29, 2011

statistics
4. Assume you are just planning this survey and want to know how many individuals you have to randomly select to be part of the sample. Assume that the purpose of the study is to calculate a 95% confidence interval for proportion of the adult population who favor lowering the ...
November 29, 2011

Economics
D. (i), (ii), (iii), and (iv)
November 29, 2011

precalc/trig
Find the trigonometric form of the number. (Round any angles to two decimal places.) −8 − i
November 29, 2011

MATH
Y=30X+.25
November 28, 2011

art
hi i am making a comic book for my teacher for a punishment for me and she saaid it has to be funny and i cant think of any thing please help me think of something. thank you
November 26, 2011

art
i need help finding a website showing me some easy to draw abstracks pictures
November 26, 2011

physics
A 6.0 kg mass moves along an inclined plane that makes an angle of 36 degrees with the horizontal. The mass is connected by a cable to a second mass of 10.0 kg, which is suspended over a frictionless, massless, pulley and is free to move. The second mass of 10.0 kg falls at a ...
November 22, 2011

calculus
Determine where the given function is concave up or where it is concave down: f(x)=9x/x^2+49
November 21, 2011

HIstory
How have the lingering influences of the New Left and the cultural radicalism of the 1960s affected both liberal and conservative politics?
November 20, 2011

american history
its d the breakup of the former state of yugoslavia
November 19, 2011

physics
When a 19.9 kg wheel with an angular speed of 3.10 rad/s is disconnected from a motor, a 0.124 N · m frictional torque slows the wheel to a stop. If the wheel has radius of 0.71 m, how long will it take for the wheel to come to rest after being disconnected from the motor?
November 18, 2011

physics
A wheel 80.0 cm in diameter accelerates uniformly from 215 rpm to 360 rpm. If in this process a point on the edge of this wheel have traveled 118 m, how long does this process take?
November 18, 2011

math
jose said all of the multiples of 8 are also multiples of 2. jamila said that all of the multiples of 8 are also multiples of 4. who is correct. Explain
November 16, 2011

ratio
24 people in 6 cars, find the unit rate?
November 15, 2011

Physics
water flows smoothly from the left-hand pipe section (radius 2.00R), through the middle section (radius R), and into the right-hand section (radius 3.00R). The speed of the water in the middle section is 0.460 m/s. What is the net work done on 0.430 m3 of the water as it moves...
November 14, 2011

Physics
Flooded Basement Water is pumped steadily out of a flooded basement at a speed of 5.5 m/s through a uniform hose of radius 0.8 cm. The hose passes out through a window 3.1 m above the waterline. What is the power of the pump?
November 14, 2011

music
i need to do make a presentation on my favourite song how do i do it. my favourite song is moves like jagger
November 12, 2011

Chemistry
Strong base is dissolved in 675 ml of 0.200 m weak acid (ka=3.25x10^-5) to make a buffer with a ph of 3.95. Assume that the volume remains constant when the base is added. HA + OH ---> H2O + A^- calculate the pka value of the acid and determine the number of moles of acid ...
November 9, 2011

Chemistry
What would be the first step of the mechanism in the hydrolysis of SiCl4? I know that SiO2 is formed, but Im confused as to how this would occur.
November 9, 2011

Adv. English 9
for the story Liberty by Julia Alvarez..
November 6, 2011

Adv. English 9
If someone could help me answer any one of these that would be great. :) 1.Name and explain the information provided in the exposition of the story. Then, name the point at which the climax takes place and explain why it is the climax. Finally, tell what is provided in the ...
November 6, 2011

Physics
R1 is the radius from the centre of the cylinder's circle, and the R3 is the distance from R1 to another specific point also near the centre of the cylinder's circle.
November 6, 2011

Physics
A uniform 2.0 kg cylinder can rotate about an axis through its center at O. The forces applied are: F1 = 5.70 N, F2 = 3.90 N, F3 = 4.30 N, and F4 = 7.00 N. Also, R1 = 12.8 cm and R3 = 4.50 cm. Find the angular acceleration of the cylinder.
November 6, 2011

probability
if for two random variables X and Y,is Y=-X then ñ=1
November 4, 2011

probability
if for two random variables X and Y,is Y=-X then ñ=1
November 3, 2011

probability
One container contains 6 red and 4 white balls, while a second container contains 7 red and 3 white balls. A ball is chosen at random from the first container and placed in the second. Then a ball is chosen at random from the second container and placed in first. What is the ...
November 3, 2011

Caculus
oh sorry, it would be y = 500/1+75e^-.625x
November 2, 2011

Caculus
y = 500/1+75e^-.625 x = egg mass y = number of tree (thousand) The function is show the forest defoliation1. Find the percent of forest defoliation if the egg mass are 100? (Using derivative) Thank you
November 2, 2011

Org.chem. I
Probably because of Chiral recognition, there are more chiral receptor for (+)-carvone in rats. This is just my guess.
October 31, 2011

math
a man buys an item from delhi 10% cheaper than that at merath, incurs loss of rs. 160, but on selling the item profits rs.240. calculate the profit percentage.
October 30, 2011

Physics
You throw a ball with a speed of 30 m/s at an angle of 40.0° above the horizontal directly toward a wall. The wall is 22.0 m from the release point of the ball. (a) How long does the ball take to reach the wall? (b) How far above the release point does the ball hit the ...
October 30, 2011

Physics
SIMPLIFY.
October 28, 2011

Physics
An arrow is shot at 29.0° above the horizontal. Its initial speed is 54 m/s and it hits the target. (a) What is the maximum height the arrow will attain? (b) The target is at the height from which the arrow was shot. How far away is it?
October 28, 2011

Physics
An arrow is shot at 29.0° above the horizontal. Its initial speed is 54 m/s and it hits the target. (a) What is the maximum height the arrow will attain? (b) The target is at the height from which the arrow was shot. How far away is it?
October 28, 2011

physics
F = ma 80 = 50(a) 80/50 1.6 m/s^2
October 28, 2011

math
juan says,"When you put together unequal groups, you can only add." is he correct? Explain
October 27, 2011

statistics
We’re writing a test case that samples a “random” black box. Given n numbers, how many times would we need to sample the black box to have n unique responses with a 99.9% confidence? Eg, if we were rolling a six-sided die, how many times would we need to roll it...
October 27, 2011

physics
A 3.8 kg toy car at rest on a horizontal surface is accelerated by a spring to 5.4 m/s in a distance of 5.9 cm. What is the spring constant of the spring?
October 27, 2011

Physics - Energy
Two comets, each of mass 6500 kg and traveling 88 m/s in opposite directions, collide head-on and come to rest. How much energy is produced in this collision? Thank you!
October 26, 2011

bio
what will happen to a red blood cell place in a solution of 99.3% water and 0.7% salt?
October 26, 2011

physics
How much work in joules must be done to stop a 5000 kg car traveling at 120 km/hr?
October 25, 2011

Math
What is the height of a trapezoid with an area of 60 square meters and bases of 8m and 12 meters?
October 25, 2011

geometry
triangular pyramid with base vertices C, A, E and B, D, and F How many planes are shown in the figure?
October 24, 2011

algebra
-2m - 18n + 17
October 23, 2011

History
By 1826 was the country more Hamiltonian or more Jeffersonian?
October 23, 2011

Chemistry
What type of lattice would FrCl have? ...im not sure about this, would a lattice form? if so, how to determine lattice type?
October 21, 2011

science
A 80.0 kg girl lowers herself to the ground from a height of 11.6 m by holding onto a rope running over a pulley to a 56.0 kg sandbag. What is the magnitude of the acceleration of the girl?
October 19, 2011

4th grade math
What are 2 other names for BN? What is another name for SL?
October 18, 2011

Physics 1 - Mechanics
You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, which is 420 km above the Earth, but he is 21 km ahead of you. (a) How long will it take you to catch up with your friend if you reduce your...
October 14, 2011

Physics 1 - Mechanics
You throw a rock with an initial horizontal velocity and it hits the ground at x meters away from your feet. What if: (a) You throw the same stone with the same initial conditions but instead you do this on a another planet with a mass 4 times the mass of the earth. With what ...
October 14, 2011

Mathematics
Alicea baked a plum bar and cut it into ninths. What fair trades can she make with Rosita, whose raspberry bar is divided into ninths?
October 14, 2011

math
4 and lower rounds down 5 and up rounds up.
October 10, 2011

Physics
In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." The radius of the room is 5.5 m, The coefficient of static friction is μ=0.1. What is the minimum rotation frequency such that the people will not slide down the wall...
October 10, 2011

Physics
An object m of mass m=1kg is attached to a string that passes through a hole in the center of a table. The object m moves in a circle of radius r=1.3m. An object M of mass M=2.1kg is tied to the other end of the string, and hangs vertically beneath the table. Assuming the ...
October 10, 2011

algebra
54x^3 +250 factor
October 9, 2011

Calculus
If f(x) = { √2-x x < 2 { x^3 + k(x+1) x ≥ 2 determine the value of the constant k for which lim exists. x->2
October 8, 2011

Calculus
Find all points of discontinuity f(x) = [x^2 + 5x - 2]/ [x^2 - 9]
October 8, 2011

math
X = 6 cm and Z = 10 cm, what is the length of Y?
October 7, 2011

math
5000
October 6, 2011

Math
The bakery sells cookies for $(1-i) each. How much will 3 + 3i cookies cost?
September 28, 2011

math
They ended up in a tie
September 28, 2011

social studies
Australia antartica and south america
September 27, 2011

Physics
Emily takes a trip, driving with a constant velocity of 79.5 km/h to the north except for a 22 min rest stop. If Emily's average velocity is 68.8 km/h to the north, how long does the trip take?
September 26, 2011

computer sciece(Computation Theory)
Find the error in the following proof that all horses are the same color. CLAIM: In any set of h horses, all horses are the same color. PROOF: By induction on h. Basis: For h = 1. In any set containing just one horse, all horses clearly are the same color. Induction step: For ...
September 26, 2011

physics
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 36 below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of ...
September 24, 2011

math
an object is launched from ground level with an initial velocity of 400 feet per second. To the nearest tenth off a second, how long does it take the object to reach a height off 650 feet?
September 22, 2011

physics
Initially (at time t = 0) a particle is moving vertically at 5.8 m/s and horizontally at 0 m/s. Its horizontal acceleration is 2.1 m/s^2. At what time will the particle be traveling at 54◦ with respect to the horizontal? The acceleration due to gravity is 9.8 m/s^2
September 21, 2011

physics
a car traveling 7.0 m/s accelerates uniformly at 2.5 m/s squared to reach a speed of 12 m/s. how long does it take for the acceleration to occur?
September 20, 2011

critical thinking.
"Some lawyers don't lie," is an example of which kind of categorial proposition? a. Particular Negative b.Particular Affirmative i think its a but i'm not sure
September 19, 2011

physics
For a), we're looking at outside of the shell which is not enclosed in the spherical shell.
September 19, 2011

physics
A point charge of 2.4 μC is located at the center of a spherical shell of radius 17 cm, which has a charge −2.4 μC uniformly distributed on its surface. Given: ke = 8.98755 × 109 Nm2/C2 . a)Find the electric field for all points outside the spherical ...
September 19, 2011

physics
Okay, when I took the quotient of the distance - r1 and r2-r1, I got 0.45 Then multiplied by Q gave me 3.6*10^-12 (I changed pC to C). Am I doing something wrong again? How did you come up with 0.3583?
September 18, 2011

physics
A charge of 8 pC is uniformly distributed throughout the volume between concentric spherical surfaces having radii of 1.7 cm and3.7 cm. What is the magnitude of the electric field 2.6 cm from the center of the surfaces? Let k_e=8.98755*10^9 N*m^2/C^2 I used the formula E=k_e(Q...
September 18, 2011

chemistry
A 150.0-mL sample of Solution A is diluted to a total volume of 423 mL to form Solution B. If the concentration of Solution A was originally 20.0 mg/L, what is the concentration (in mg/L) of Solution B?
September 18, 2011

chemistry
Calculate the concentration (in mg/L) of a solution formed by dissolving 5.000 g of solute in enough solvent to make 2.300 L of solution.
September 18, 2011

algebra 1
From a shipment of 350 light-bulbs, a sample of 70 was selected at random and tested. If 21 light-bulbs in the sample were found to be defective, how many defective light-bulbs would be expected in the entire shipment?
September 18, 2011

Physics
When the sun was directly overhead in Syene, why was it not directly overhead in Alexandria?
September 16, 2011

Chemistry
I am not sure if I have the right answer or not to the following question. One mole of NO2 would be produced from how many moles of molecular nitrogen> According the equation N2 + 202 > 2NO2. I was thinking maybe 2. Does anyone know if I am right or wrong. Thanks
September 15, 2011

3rd grade math
How would you use a number line to round 148 to the nearest ten?
September 14, 2011

3rd grade math
1. Which number does not round to 400? 347 369 413 448
September 14, 2011

MATH HELP PLEASE
8 remainder of 1
September 14, 2011

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