Monday

March 30, 2015

March 30, 2015

Total # Posts: 2,912

**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*

**3rd grade math**

Tyrell says 753 rounds to 800. Sara says 753 rounds to 750. Who is correct? Explain.
*September 14, 2011*

**math **

Do 20+50 which is 70 then 5+9 which is 11 then add 70+11.
*September 13, 2011*

**3rd grade math**

It's 40.
*September 13, 2011*

**3rd grade math**

A Texas horned lizard laid 37 eggs in one place. To the nearest ten, about how many eggs did the lizard lay?
*September 13, 2011*

**third grade math**

Does (4+5) + 2 = 9+2? Explain
*September 12, 2011*

**College Physics**

A)2 b)5.7 C)87.7 D) 76.4 E)4.5
*September 12, 2011*

**MATH(order of operations help)**

What is the only order of operations that does NOT proceed from the left to the right
*September 9, 2011*

**Math**

Find a formula and graph the function: A ferris wheel is 20 meters in diameter and boarded in the six oclock position from a platform that is 4 meters above the ground. The wheel completes one full revolution every 2 minutes. At t=0 you are in the twelve oclock position.
*September 5, 2011*

**probability---normal distribution**

population size=50 population mean= 80m standard deviation = 0.70m what proportion would have average meter of 89 or more? ---------------------------- now I know how to solve this problem if the question is worded "what proportion would have average meter Greater than 89...
*September 4, 2011*

**trig**

If sin T = 1/2, then the value of sinT ( sinT - cosecT ) is
*September 3, 2011*

**chemistry**

Magnesium metal reacts with HCl solution, liberating H2 gas and generating Mg2+ cations in solution. A 2.335-g sample of Mg metal is added to 50.0 mL of a 4.00 M HCl solution, and the reaction goes to completion. How many grams of H2 are formed?
*September 1, 2011*

**language and barriers**

It's not C.. I think in order to be a good ESL teacher you yourself have to set aside all the predjudice and what not that you yourself can think off...
*August 31, 2011*

**Algebra **

In a class of 110 students, 22 received the grade of A. what fraction of the students did not receive the grade A?
*August 31, 2011*

**Child Care Managment**

which of the following is is best suited to a formative assessment of progress? A, muscular strngth and endurance B body fat analysis C. Flexibility D awareness of selfand space. I think is A. But if Im wrong can somebody help me. thanks.
*August 19, 2011*

**calculus**

using tangent half substitution show that integral of sec(x)=ln(secx+tanx)
*August 14, 2011*

**Math**

x = 125
*August 13, 2011*

**Math**

There are 150 green marbles and 100 yellow marbles in a bag that contains 250 marbles. If only yellow marbles are added to the bag so that the probability of randomly drawing a yellow marble from the bag becomes 3/5, how many yellow marbles are in the bag?
*August 13, 2011*

**Math**

What are all values of x for which |2x-3| < 7 ?
*August 13, 2011*

**Math**

Sigourney Weaver's average rate going uphill was 80% of her average rate going downhill over the same route, and it took Sigourney Weaver 10 minutes longer to go up the hill than to go down the hill. What was the total number of minutes Sigourney Weaver spent going uphill ...
*August 13, 2011*

**Physics**

An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...
*August 10, 2011*

**Physics**

An artery branches into two smaller veins, identical arteries as shown in the diagram. The largest artery has a diameter of 10 mm. The two branches have the same diameter = 5 mm. The average speed of the blood in the main artery is given in the diagram. The blood has a density...
*August 10, 2011*

**Math**

What is the answer for this question: Divide 100 loaves of bread among five men so that the amounts are in aritmetic progression (increase by the same amount each time) and the sum of the 3 largest is 7 times the amount of the 2 smallest
*August 4, 2011*

**Physics**

Nevermind I was able to finally figure it out xP
*August 2, 2011*

**Physics**

You set out to design a car that uses the energy stored in a flywheel consisting of a uniform 103-kg cylinder of radius R that has a maximum angular speed of 450 rev/s. The flywheel must deliver an average of 1.70 MJ of energy for each kilometer of distance. Find the smallest ...
*August 2, 2011*

**Calculus**

Sales of Version 5.0 of a computer software package start out high and decrease exponentially. At time t, in years, the sales are s(t)=20e^-t thousands of dollars per year. After 2 years, Version 6.0 of the software is released and replaces Version 5.0. Assume that all income ...
*July 28, 2011*

**Calculus**

It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 5% per year. If the current demand is increasing by 4000 units per year and if the price remains fixed at $850 per unit, how much revenue will the ...
*July 24, 2011*

**Physics**

Ah I see thank you, I had tried a different setup before which got me the wrong answer. But this helps a bunch thanks!
*July 19, 2011*

**Physics**

A curve of radius 161 m is banked at an angle of 12°. An 840-kg car negotiates the curve at 94 km/h without skidding. Neglect the effects of air drag and rolling friction. Find the following. (a) the normal force exerted by the pavement on the tires (b) the frictional ...
*July 19, 2011*

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