Sunday

February 7, 2016
Total # Posts: 3,258

**Reading**

When you're scribbling a note with a pencil, do you ever wonder what this handy tool is made from? To get right to the point, a pencil is made of a number of materials. The inside is made of graphite that is reinforced with clay. Its wooden outside comes from cedar trees. ...
*January 5, 2012*

**Reading**

Icebergs can be slippery slopes for ships at sea. An iceberg can be dangerous to ships because more than 3/4 of it is under the water. Most of it isnt visible. Icebergs are found in the cold seas near the North and South Poles. The wind and currents move them through the water...
*January 5, 2012*

**physics**

A 80 kg man weighs 784 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
*December 19, 2011*

**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*

**physics**

The answer above is WRONG. 136 km/h = 38.3333 m/s x = x0 + vi*t + .5*a*t^2 xtropper = 0 + 0 + .5*3.8*t^2 xspeeder = 0 + 38.3333t + 0 xtropper = xspeeder .5*3.8*t^2=38.3333t t = 20.17542105 xtropper = .5*3.8*20.17542105^2 xtropper = 773.3904676
*September 29, 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*

**Mathematics**

800
*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*