Tuesday

September 27, 2016
Total # Posts: 2,817

**Physics**

A bullet of 10g enters a target at 100 ms-1 and leaves it 0.01 s later. Calculate: i. The rate of change of momentum of the bullet ii. The resistance offered by the target iii. The loss of kinetic energy of the bullet iv. The deceleration of the bullet v. The distance ...

*September 19, 2012*

**algebra 2**

solve for x: (exact answers) 5^(2x+1)-26(5^x)+5=0

*September 19, 2012*

**algebra 2**

list all solutions if x^(4)+x^(3)-11x^(2)+9x+20=0 and if one of the roots is x=2-i

*September 19, 2012*

**geometry**

if the length of each edge in a cube is increased by the same percent and the result was a cube that had 25% more volume than it originally had, by what percentage were the edges increased

*September 19, 2012*

**Physics**

A bullet of 10g enters a target at 100 ms-1 and leaves it 0.01 s later. Calculate: i. The rate of change of momentum of the bullet ii. The resistance offered by the target iii. The loss of kinetic energy of the bullet iv. The deceleration of the bullet v. The distance ...

*September 19, 2012*

**geometry**

EARTH COMPLETES ONE FULL ROTATION EACH DAY MAKING THE SUN APPEAR TO RISE AND SET. IF THE SUN PASSES DIRECTLY OVER HEAD, BY HOW MANY DEGREES DOES ITS POSITION IN THE SKY CHANGE EVERY HOUR?

*September 19, 2012*

**english **

Which sentence BEST combines the ideas shown below? (I put an arrow on the one I think the answer is) --->A.The football player did not seem seriously injured. As a precaution, the trainers moved him carefully. B.The football player did not seem seriously injured, and as a...

*September 18, 2012*

**Algebra**

4/3x -1

*September 18, 2012*

**Algebra**

Find an equation for the line satisfying the given conditions.Through (3, 3) and parallel to 4x - 3y = 6. y=?

*September 18, 2012*

**11th grade maths**

How do you fiind the averege rate change

*September 17, 2012*

**pre - algebra**

maria had $123 she spent $35,loaned $20 to a friend and recieved her $90 paycheck how much does she have now? so you would do 123 -20=103 and then 103 - 20=83 and 83 + 90 =wich is 173 so that would be the answer right?

*September 16, 2012*

**pre-algebra**

and then like um my next question is maria had $123 she spent $35,loaned $20 to a friend and recieved her $90 paycheck how much does she have now? so you would do 123 -20=103 and then 103 - 20=83 and 83 + 90 =wich is 173 so that would be the answer right?

*September 16, 2012*

**pre-algebra**

so the 15 - 9=4 okay thanks ms. sue for helping me with my 7th grade pre algebra hw I will probably need more help I will jut post my other questions too.

*September 16, 2012*

**pre-algebra**

A football team gained 4 yd, lost 2 yd, gained 11yd, lost 8 yd, and then lost 9 yd. Find the net gain or loss.

*September 16, 2012*

**physics**

A bicycle has a speed of 7.5m/s at 4.3sec and a constant acceleration of 2.6m/s^2. the bicycle is at the origin (on the positive x-axis) when 1.2sec. How far from the origin is the bike at 7sec? Answer in units of m

*September 16, 2012*

**physics**

A bicycle has a speed of 7.5m/s at 4.3sec and a constant acceleration of 2.6m/s^2. the bicycle is at the origin (on the positive x-axis) when 1.2sec. How far from the origin is the bike at 7sec? Answer in units of m

*September 16, 2012*

**Physics**

In deep space (no gravity), the bolt (arrow) of a crossbow accelerates at 187m/s^2 and attains a speed of 114m/s when it leaves the bow. For how long is it accelerated? Answer in units of m/s What speed will the bolt have attained 2.8 sec after leaving the crossbow? Answer in ...

*September 16, 2012*

**physics**

A body moving with uniform acceleration has a velocity of 11.1cm/s when it's coordinate is 3.59cm. If it's x coordinate 2.48sec later is -3.58cm, what is the x-component of it's acceleration. Answer in units of cm/s^2

*September 16, 2012*

**Algebra 2**

How many 2 liter mountain dew bottles would it take to fill up the earth if the radius is 6378.1?

*September 15, 2012*

**Physics**

A partly-full paint can has 0.83 U.S. gallons of paint left in it. (a) What is the volume of the paint, in cubic meters? (b) If all the remaining paint is used to coat a wall evenly (wall area = 12 m2), how thick is the layer of wet paint? Give your answer in meters.

*September 14, 2012*

**science**

the ph of a 0.280m solution of a weak base. B has been measured ph --8.69. using this information. calculate the base ionisationconstant kbof b

*September 14, 2012*

**math**

Find all the values of x in the interval [0,2π] that satisfy the equation: 8sin(2x)=8cos(x)

*September 13, 2012*

**7th Grade Science**

Autotrophic, Multicellular, Eukaryote, Vascular/Non-Vascular, Cell Wall, Photosynthesis, and Needs Water To Survive.

*September 13, 2012*

**Algebra II**

9x+y is less than or equal to 1700 9x+3y is less than or equal to 1800 4x+8y is less than or equal to 2400 ***I need help plugging in numbers for x and y. The numbers don't have to be the same for each question.

*September 13, 2012*

**Math**

Solve for t using natural logarithms. 7e^3t = 10e^2t

*September 11, 2012*

**Math**

The quantity demanded each month of Russo Expresso Makers is 250 when the unit price is $136.oo. The quantity demanded each month is 1,2oo when the unit price is $98.00. The suppliers will market 700 espresso makers if the unit price is $58.00 or lower. At a unit price of $74....

*September 11, 2012*

**Physics**

A ping pong ball is rolling across a table at 22 cm/s. When the ball is 78 m away from the edge your little brother starts to blow on it. If the little doofus hopes to prevent the ball from falling off the edge, what minimum acceleration must be achieved?

*September 10, 2012*

**xx**

explain problem: 3.1 - 2.076=

*September 10, 2012*

**Finite, Math, Probability**

Assume that there are 17 board members: 9 females, and 8 males including Carl. There are 4 tasks to be assigned. What is the probability that at least one female and Carl are assigned tasks?

*September 10, 2012*

**Chemistry**

Help with any of these: 21. Aluminium sulphate is often used by gardeners to acidify soil and can be produced by the reaction 2Al(OH)3(aq) + 3 H2SO4(aq) à Al2(SO4)3(aq) + 6 H2O(l) The volume of 0.275 mol/L H2SO4(aq) needed to react completely with 112...

*September 9, 2012*

**Physics**

An attacker at the base of a castle wall 3.82 m high throws a rock straight up with speed 7.10 m/s from a height of 1.45 m above the ground. (a) Will the rock reach the top of the wall? __yes __no (b) If so, what is its speed at the top? If not, what initial speed must it have...

*September 8, 2012*

**Help On Math**

Thanks

*September 8, 2012*

**Help On Math**

A movie theater has fixed costs of $5,500 per day and variable costs averaging $2 per customer. The theater charges $7 per ticket. How many customers per day does the theater need in order to make a profit? Give the smallest possible value. The theater makes a profit when it ...

*September 8, 2012*

**phys**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.30 m/s. The car is a distance d away. The bear is 32.9 m behind the tourist and running at 4.92 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

*September 6, 2012*

**phys**

A pellet gun is fired straight downward from the edge of a cliff that is 28.5 m above the ground. The pellet strikes the ground with a speed of 26.1 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?

*September 6, 2012*

**phys**

A woman on a bridge 84.7 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 8.02 m more to travel before passing under the bridge. The stone hits the water 4.86 ...

*September 6, 2012*

**Math**

I need to solve this set of differential equations {y'+(t/2)1, y(0)=1} and then find the limiting value as t approaches infinity. I'm not sure where to start. I found the answer to the differential equation to be: y(t)=e^-t^2/4[e^(r^2/4)dr +Ce^(-t^2/4)where the [ sign ...

*September 6, 2012*

**physics**

A heavy piece of equipment(85kg) is being moved by elevator between floors in a building. Two identical small cranes are used. A cable connecting each crane to a mounting hook on the top of the piece of equipment.The cable from one crane is at an angle of 22 degree below the ...

*September 5, 2012*

**DT**

For my DT homework I need to do a health and safety poster on a Pillar Drill. I need to find health and safety facts on a Pillar Drill. Please can you help me. Thanks

*September 4, 2012*

**physics**

You are driving down the road at a constant speed. another car going a bit faster catches up with you and passes you. draw a position graph for both vehicles on the same set of axes and note the point on the graph where the other vehicles passes you. if you have been passed by...

*September 4, 2012*

**physics**

A viking sails from his home port and travels east at 15km/hr.after 10 hours, the wind change and he is blown south west at 20km/hr for six hours.at his point wind drops, the ship is becalmed and doesnot move for the next ten hours.becoming tired of waiting,the viking order ...

*September 4, 2012*

**physics**

A landing craft of mass 12000 kg prepare itself for moon landing. when at a vertical distance 160m above the moons surface its downward velocity is 15 m/s. a retrorocket is fired to give the craft an upward thrust to slow its speed to zero as it meet the surface.calculate the ...

*September 4, 2012*

**science**

A simple model for a person running a 100m race is to assume the sprinter runs with constant acceleration until reaching top speed, and then maintains that speed through the finish line. If a sprinter reaches their top speed of 11.2ms-1 in 2.15s, what will be their total time?

*September 4, 2012*

**chemistry**

Sulfuric acid (H2SO4) is prepared commercially from elemental sulfur using the contact process. In a typical sequence of reactions, the sulfur is ﬁrst burned: S + O2 → SO2 , then it is converted to SO3 using a catalyst: 2 SO2 + O2 → 2 SO3 . The resulting SO3...

*September 2, 2012*

**chemistry**

A 12.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.3 g. What was the mass of iron in the sample of ore? Answer in units of g

*September 2, 2012*

**algebra**

how do i explain how to write 20 miles/4 hours as a unit rate?

*August 30, 2012*

**ap chemistry**

name five organic compounds that melt between -40 degrees and -49 degrees celsius

*August 26, 2012*

**Algebra**

Thank You Reiny i see what you did there :) i was confused on some of the things but i understand how to do that stuff now! Thanks Again!, Emily

*August 22, 2012*

**Algebra**

BTW!!! I need it explained on like how you figured it out because i have another ? like it and i want to try and do that one on my own!!! THX! ;)

*August 22, 2012*

**Algebra**

I need help with this like really badly sooo yeahhhh:) here it is: Hugo withdrew some money from his bank account. He spent one third of the money for gasoline. Then he spent half of what was left for a haircut. He bought lunch for $6.55. When he got home,he had $13.45 left. ...

*August 22, 2012*

**Physics**

We know that speed of water is 15m/s so we can assume the tube height to be 15 m. Are of cross section is given... So volume of the cylinder(water flowing) can be calculated Volume=0 .15 m^3 Density=mass/ volume.as density of water is 1000 kg/m^3..... Mass of water is 150 kg. ...

*August 20, 2012*

**health**

Teachers are there to help, not provide answers to kids. She's handing them the necessary tools to get the answer and they are still choosing to be lazy and guess. Stop judging a teacher for being impatient. Blame a parent for not disciplining their child

*August 14, 2012*

**Physics**

20/9

*August 7, 2012*

**health!**

the answer is C

*August 3, 2012*

**programming**

Given a = 5, b=1, x=10, and y =5, create aprogram that outputs the result of the formula f = (a b)(x y) using a single printf() function. B> Create a program that uses the same formula above to output the result; this time however, prompt the user for the values a, b, x, ...

*July 24, 2012*

**Math **

1.) A security code has seven characters. Each code begins with two digits, then two letters, and finally three digits. the number of distinct security codes possible if repetition is allowed? 2.) How many ten digit phone numbers are possible if a number may not begin with a 0...

*July 16, 2012*

**Physics**

For part c, it says regarding the common velocity Vf isn't that different than Vcm?

*July 10, 2012*

**Physics**

I figured out a and b, but I can't seem to figure out C.

*July 10, 2012*

**Physics**

Car 1 has a mass of m1 = 65 103 kg and moves at a velocity of v01 = +0.76 m/s. Car 2, with a mass of m2 = 92 103 kg and a velocity of v02 = +1.5 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your answer. (a) Determine the velocity of their center ...

*July 10, 2012*

**Physics**

Two forces, 1 and 2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 58.0 N and F2 = 26.5 N. What is the horizontal acceleration (magnitude and direction) of the block?

*June 27, 2012*

**Physics**

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end...

*June 27, 2012*

**Physics**

In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 36 m/s (around 80 mi/h) in a time of 5.5 s. The mass of the car and riders is 4900 kg. Find the average net force exerted on the car and riders by the ...

*June 26, 2012*

**Physics**

A person with a black belt in karate has a fist that has a mass of 0.70 kg. Starting from rest, this fist attains a velocity of 6.9 m/s in 0.15 s. What is the magnitude of the average net force applied to the fist to achieve this level of performance?

*June 26, 2012*

**Physics**

Could someone explain how to do this?

*June 22, 2012*

**Physics!!!**

A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through ...

*June 22, 2012*

**Physics**

A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through ...

*June 21, 2012*

**math**

diving 12 and56

*June 16, 2012*

**Geometry**

The math club of Ritzy High designed a pennant for the school yacht. The pennant was in the shape of an isosceles triangle. Two points, P and Q, are located so that AC= PQ= QB. Find the measure of angle B.

*June 9, 2012*

**Physics**

How are you getting -44 mph for the final velocity?

*June 6, 2012*

**Physics**

How fast would a 9-g fly have to be traveling to slow a 1790-kg car traveling at 58 mph by 4 mph if the fly hit the car in a totally inelastic head-on collision?

*June 6, 2012*

**math**

create a situation that can be modelled by this linear system, then write a related problem. 10x + 5y = 850 x - y = 10

*June 3, 2012*

**math**

26 math words

*May 31, 2012*

**math**

26 math words

*May 31, 2012*

**physics**

A spherical mirror has a focal length of −0.59 m. An object of height 0.045 m is located 0.42 m in front of the mirror. What is the height (including its sign) of the object’s image?

*May 29, 2012*

**Precalculus**

What are the exact values for which tan t = -(sqrt3)

*May 23, 2012*

**chemistry**

3CaCO3+2FePO4-->Ca3(PO4)2+Fe2(CO3)3 We start with 100g. of calcium carbonate and 45g. iron (III) phosphate. What is the maximum amount of Ca3(PO4)2 and Fe2(CO3)3 ??

*May 14, 2012*

**Physics**

A 1.4 kg mass is attached to a spring with a force constant of 56 N/m. If the mass is released with a speed of 0.26 m/s at a distance of 8.6 cm from the equilibrium position of the spring, what is its speed when it is halfway to the equilibrium position?

*May 14, 2012*

**English**

She TRIED and she was looking to see if her answers were correct, which they were not so someone gave her the right answers, she learned from this. Your ignorance was not needed nor is it wanted. Btw getting an education is succeeding and learning, which is what this was! ...

*May 13, 2012*

**Chemistry**

A bond between two sugar molecules is formed by which of the following types of reactions? oxidation-reduction condensation single-replacement double-replacement

*May 10, 2012*

**Chemistry**

What can you say about the energy spread of the radiation emitted by an atomic gas?

*May 8, 2012*

**Chemistry**

Based on the spectrum of the fluorescent lamp, what is the main difference between the radiation emitted by a heated solid (filament) and the radiation emitted by an atomic gas (mercury gas in the fluorescent tube)?

*May 8, 2012*

**Chemistry**

Thank you SO much!

*May 8, 2012*

**Chemistry**

1. Describe the relationship between the color change of the filament with temperature, and the colors in the observed spectrum of white light. 2. Order the colors of the rainbow according to the amount of energy needed to produce them, from lowest to highest.

*May 8, 2012*

**Calc III**

Find the position vector of a particle that has the given acceleration and the specified initial velocity and position. a(t)= 56t i + sin(t) j + cos(2t) k v(0)= i r(0)= j I need help finding r(t) Thanks so much for your help!!

*May 4, 2012*

**visual and performing arts**

Explain why the Chartres Cathedral both is and isn't an example of the "High Gothic" style. Be sure to reference specific pieces of art in your response.

*May 3, 2012*

**visual and performing arts**

well i think its pythagoros or socrates but im not sure.

*May 3, 2012*

**visual and performing arts**

From what Greek philosopher did Abbot Suger draw inspiration? .Aristotle .Socrates .Pythagoros .Pseudo-Dyonysius

*May 3, 2012*

**performing and visual arts**

im not at all sure about this one.

*May 3, 2012*

**performing and visual arts**

What is another name for Gherardo Starnina? .Master of Bambino Vespo .Gentile da Fabriano .Duccio Buoninsegna .Giotto Bondone

*May 3, 2012*

**Chemistry**

A 55.0-mg sample of Al(OH)3 is reacted with 0.200M HCl. How many milliters of the acid are needed to neutralize the Al(OH)3.

*May 1, 2012*

**Chemistry**

What is the molarity of a sodium hydroxide solution if 38 mL of the solution is titrated to the end point with 14 mL of 0.75M sulfuric acid?

*May 1, 2012*

**Chemistry**

What is the molarity of a sodium hydroxide solution if 38 mL of the solution is titrated to the end point with 14 mL of 0.75M sulfuric acid?

*May 1, 2012*

**statistics**

if the null hypothesis is that the mean is 3218, the alternative hypothesis is that the mean > 3228, and the sample mean is x= 3342, the sample standard deviation is s=287, the sample size is n= 42, and α= 0.01 a. calculate the z test statistic. b. what is the p-value...

*April 29, 2012*

**statistics**

do you want to own your won candy store? start up costs (units in 1,000) for a random sample of candy stores are: (95, 173, 129, 95, 75, 94, 116, 100, 85) Use an 80% confidence interval to test the null hypothesis that the mean start up cost is 118. Justify answer.

*April 29, 2012*

**statistics**

sorry, the question is above this link

*April 29, 2012*

**book report**

can someone show me how a third grade bokreport layout is done

*April 28, 2012*

**Consumer Math**

Find the annual amount of FICA at a 7.51% rate by computing his annual salary. Sam Takagi Weekly salary: $435.16 Not self-employed Find the annual amount of FICA by computing his annual salary. $169,938.68 $16,993.87 $1,699.39 2. Find the annual amount of FICA at a 7.51% rate...

*April 27, 2012*

**Chemistry**

A sample of ammonium salt (NH4X) having a mass of 1.618g was heated with NaOH and the liberated ammonia was reacted with 50.00 of .6230 mol/L HCl. The excess acid required 1.50 mL of .6115 mol/L NaOH in titration. What is the formula of the salt?

*April 25, 2012*

**College Chemistry**

I need help with this question!! a sample of pure KHP weighing .8097g dissolved in water and titrated with 40.25 mL of NaOH solution. The same NaOH solution was used to titrate a solution of a weak diprotic acid H2X. A sample of 0.18694g of the weak acid was first dissolved in...

*April 25, 2012*