Friday

December 9, 2016
Total # Posts: 2,599

**Physics**

For launching a satellite into orbit around earth, would the proper conservation of energy formula be: Epi + Eki + O work = Epf + Ekf? Would work = 0 for launching a satellite? And, would Epi = -Gm1m2/radius of earth or would it just equal 0 (because we usually set Ep on earth...

*February 28, 2013*

**Chem**

Calculate the pH of a .50 M solution of NaCl.

*February 27, 2013*

**Physics**

The electric field strength @ distance = 1.0 m from a point charge is 4.0 x 10^4 N/C. What is the Electric field strength @ 2.0 m from the same charge?

*February 27, 2013*

**Physics**

Thanks!

*February 27, 2013*

**Physics**

On the moon's surface, the force of gravity exerted by the moon on a camera is 2.4 N. What is the force of gravity exerted by the moon on the camera when it is in orbit with a radius = to twice the moon's radius?

*February 27, 2013*

**Maths A**

Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 inclusive. o The next ten (10) numbers must lie in the range from 30 to 70 inclusive. o The remaining eight (8) numbers must lie in the range from 50 to 95...

*February 25, 2013*

**Maths A**

A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...

*February 25, 2013*

**maths a**

The Bough and Bud Company combined an insect spray with a growth hormone to produce the MOP (More Oranges Production) Treatment, which was expected to increase the number of oranges produced by each tree. The data below shows the number of oranges produced by each tree in two ...

*February 25, 2013*

**MATHS A**

A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...

*February 25, 2013*

**Maths A**

For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ...

*February 25, 2013*

**Maths**

For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ...

*February 25, 2013*

**Math f(x)**

given f(x)= x^2+x and g(x)=2x+1 determine f[g(x)] i don't even know where to start with this question help is much needed

*February 22, 2013*

**chemistry**

A factory that specializes in the refinement of transition metals such as titanium was on fire. Provide kinetic-based arguments (concentration and temperature) explaining why water would be dangerous for the firefighters.

*February 18, 2013*

**Chemistry**

The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 21.3g of the compound? Please help. I am SO confused on all of this!!

*February 16, 2013*

**Math/Accounts**

Estimate the cost of ending inventory based on the retail method using the following information: Cost Retail Beginning Inventory $ 600,000 $ 800,000 Purchases $ 450,000 $ 600,000 Net Sales $1,000,000 A. $150,000 B. $262,500 C. $300,000 D. $750,000

*February 13, 2013*

**Business Analysis**

Mahalyk's Water Fun Shoppe specializes in jet skis. Mahalyk's inventory records showed the following for the past year. Purchase Date Number of Jet Skis Cost Per Jet Ski February 10 30 $4,000 May 12 80 $3,000 June 15 20 $3,500 July 20 15 $2,500 Use the FIFO method to ...

*February 13, 2013*

**Business Analysis**

A firm has the following inventory information for the first quarter: 01/01 Beginning Inventory 50 units @ $5 01/15 Purchases 80 units @ $5.50 02/15 Purchases 60 units @ $5.25 02/15 Purchases 40 units @ $5.75 Sales 170 units @ $10 Total operating expenses $500 What is ending ...

*February 13, 2013*

**Math**

How many distinct numbers greater and equal to 100 and smaller than 3000 can be formed using digits 0,1,2,3,4, without repetition of digits?

*February 12, 2013*

**chemistry**

12.50g of an unknown compound (i=2) are dissolved in 50.00g of water and this solution freezes at –7.5 degrees C. What is the molar mass of this compound?

*February 12, 2013*

**Chemistry**

its concentration, so it should be mol/L

*February 10, 2013*

**Chemistry**

True, however, I keep getting a negative value which is not possible.

*February 10, 2013*

**Chemistry**

Find the initial concentration of NO2 if the concentration after 2.00 min is 0.113. k = 0.331 1/(M * s) 2 NO2 (g) + N2 (g) --> 2 N2O (g) + O2 (g)

*February 10, 2013*

**Psychology**

Dr. Gillian explained that research has identified over 25,000 genes which are responsible for the genetic information which progresses from generation to generation. These genes are:

*February 6, 2013*

**Organic chemistry**

We conducted a diels-Alder reaction of cyclopentadiene with Maleic Anhydride experiment. Though I was wondering why we added ligroin to the maleic anhydride and ethyl acetate. I know ligroin can be used as a solvent, but I thought that ethyl acetate was the solvent in this ...

*February 6, 2013*

**Chemistry**

If it had gone down then how would we calculate it

*February 2, 2013*

**Chemistry**

Freezing point of pure water = -2, Freezing point of Unknown solution = -1 Mass of unknown in 50g of water = 1.9964g. Calculate the delta T for the solution of the unknown solid and determine the molecular weight of the unknown solid.

*February 2, 2013*

**English**

Where reading the poem "LEGAL ALIEN" by Pat Mora . We have to find the rhythm,meter, and assonance . I cant fimd any of that in the poem . Please tell me what each one of them are in the poem .. Reply ASAP please

*February 2, 2013*

**general chemistry**

A reaction involves fictional reagents A & B is begun with the inital concentration of 0.05M A and 0.01M B. The reaction reaches completion in 16 seconds. What is the initial rate of the reaction in respect to A? and what is the order in respect to B

*January 30, 2013*

**Math**

The expression ax^3+2x^2+cx+1 is 5x^3-3 greater than 3x^3+bx^2+d-7x. Find a, b, c, and d.

*January 29, 2013*

**Chemistry**

An aqueous KNO3 solution is made using 73.4g of KNO3 diluted to a total solution volume of 1.86 L. Calculate the molarity of the solution. (Assume a density of 1.05 g/ml for the solution.)

*January 29, 2013*

**elementary math**

thank you..

*January 25, 2013*

**elementary math**

i did use my poof to prove. im not sure im doing right. here is exercises: 'Suppose a,b,c are integers if a|b and a|c, then a|(b+c).' my answer: Proof. Suppose a|b ans a|c. By Definition of divisibility. we know a|b means there is an integer x with b= ax. Likewise, a|c...

*January 25, 2013*

**Precalculus**

How do you solve this problem: sin(90* - x) ----------------- cot^2(90* - x) + 1 The * is a degree symbol!! I haven't seen any problems with degrees in it, usually it's only a variable! If anyone could give me guidelines or show me where to start, I'd really ...

*January 23, 2013*

**physics**

Calculate the speed of a proton having a kinetic energy of 1.00 × 10 −19 J and a mass of 1.673 × 10 −27 kg. Answer in units of m/s

*January 22, 2013*

**Spanish**

Les vas a dar muchos regalos a tus padres. Quiero comprarles unos guantes a mis sobrinos Clara va a venderle sus libros de literatura francesa a su amiga. Los clientes nos pueden pagar con tarjeta de crédito

*January 21, 2013*

**Algebra**

A box with a lid is to be cut out of a 12 inch by 24 inch sheet of thin cardboard by cutting out six x-inch squares and folding them. What are the dimensions to two decimal places of all possible boxes that will have a volume of 100 cubic inches?

*January 15, 2013*

**Geometry**

A triangular entraceway has walls with corner angles of 50, 70, 60. The designer wants to place a tall bronze sculpture on a round pedestal in a central location equidistant from the three walls. How can the designer find where to place the sculpture?

*January 13, 2013*

**math**

I have a board 18" x 18" x 1/8" I need to support it in an upright position at a 15 degree angle. How big must the base of support be to keep it from falling over.

*January 13, 2013*

**geometry**

The coordinates for a rhombus are given as (2a, 0), (0, 2b), (–2a, 0), and (0, –2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas.

*January 8, 2013*

**Science**

Does anyone know a Commensalism of the Baltimore Checkerspot? If you do know, I need the awnser ASAP. Please help. Thank you.

*January 8, 2013*

**math**

how do I correctly show four as an array?

*January 3, 2013*

**physics**

A bobcat jumps with a speed of 5m/s at an angle of 55 degrees. How long does the bobcat stay in the air?

*December 23, 2012*

**Ms.Sue or Steve can u please help me?!?!!?**

Me too, Gabby. Excellent job. You didn't need help at all. Thanks for the help. You should be the tutor.

*December 21, 2012*

**algebra**

A ball is thrown(from 0') straight up at 50' per second, how long before it hits the ground? How high does it go?

*December 19, 2012*

**Calculus BC**

32

*December 19, 2012*

**Science**

How does a body fossil form? Is it just bones and teeth?

*December 12, 2012*

**philosophy**

explain necessary and sufficient conditions and how providing these is one approach to defining a term

*December 11, 2012*

**Math**

The rim of the London Eye (a 135m diameter ferris wheel) moves 26 cm/sec, slow enough for passengers to safely get on the wheel from the platform (2 meters above ground level) without stopping the wheel at the bottom of its rotation. What's the height at the bottom of the ...

*December 10, 2012*

**poli sci**

Which of the fundamental American political values does the "Tea Party" most fundamentally support? Do you believe the "Tea Party" is a legitimate heir of the Founding Father's protest against the British? Do you believe the Tea Party will transform ...

*December 9, 2012*

**Physics**

I calculated tan and sin (theta) for a physics lab experiment -- two-slit interference I had to use this equation y = L tan (theta), with y = 0.25 and L = 2 and tan (theta) came out to be 7.12 in degrees and 0.1243 in radians. I found sin (theta) by using the triangle for X^2...

*December 8, 2012*

**physics**

I need a 1.00 W motor to push a garbage compactor so that it squishes some garbage. The garbage has a spring constant of 49.7 N/m. If I am going to squish it 30 cm, determine how much time the compactor takes.

*December 7, 2012*

**science**

thankss

*December 5, 2012*

**science**

What is the wavelength of waves transmitted by an AM radio station operating at a frequency of 840 kilohertz? Calculate the energy of a photon whose frequency is 2450 megahertz What is the difference in energy for a photon of ultra-violet radiation, wavelength 319 nm and a ...

*December 5, 2012*

**College Algebra**

I believe this is the correct answer

*December 3, 2012*

**science **

A wolf us chasing a rabbit.Graph the wolf's motion using the following data: 15 m\s at 0 s,10 m\s at 3 s,1 m\s at 4 s,and 0 m\s at 5 s.What does the graph tell you???

*December 1, 2012*

**Math**

Could someone explain how to graph the following problem? I don't quite understand what "Graph H for 0 ≤ t ≤ 3 and 300 ≤ H ≤ 340" is asking me to do... The National Oceanic and Atmospheric Administration (NOAA) has been measuring ...

*November 30, 2012*

**American History**

true or false The Great Migration was a large-scale movement of hundreds of thousands of southern African Americans to Weswtern farms.

*November 29, 2012*

**physics**

exactly. This is all I was given. Possibly SumOf t = T(exp)*length* sin(theta) - W(hang) * length * sin(phi) - W(boom) * L(exp) * sin(phi) = 0 but im not sure.

*November 28, 2012*

**physics**

The torques acting on the crane boom can be computed about anaxis passing through the top of the boom. (this is the place wherethe spring scale and mass hanger connect to the boom) apply thesecond condition for equilibrium to the crane boom and derivethe resulting equation for...

*November 28, 2012*

**physics**

a clothes washer starts from rest and spins up with an angular accceleration of 10/rad/s^2. Determine the angle through which the washer has moved afer 6 seconds.

*November 28, 2012*

**Math**

this problem is modelling daylight hours using the form y = d+a sin[b(t-c)], btw

*November 26, 2012*

**Math**

How would I solve for t if y equals 720 minutes of daylight and t=the number of days in 2012 720 = 713.7+152.7 sin [(2pi/366)(t-80.75)]

*November 26, 2012*

**trig**

i think i figured out my mistake. it should be 720 = 713.7+152.7 sin [(2pi/366)(t-80.75)] this problem is modelling minutes of daylight in a town using the form y = d+a sin[b(t-c)]. let y equal 720 minutes of daylight and let t=the number of days in 2012

*November 25, 2012*

**trig**

How would I solve this problem for t? 720 = 11.895+2.545sin [2pi/366(t-80.5)]

*November 25, 2012*

**spanish literature**

Osvaldo Dragun in his story Historia del hombre que se convirtio un perro: what is the conflict that the protagonist feels strongly about?

*November 24, 2012*

**stat and research**

3. A researcher is interested in whether listening to music helps or hinders test-performance. To control for differences in cognitive level, this researcher decides to use a within-participants design. He selects a random sample of participants and has them study different ...

*November 23, 2012*

**math**

use any method to estimate 667-651

*November 21, 2012*

**Physics**

A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed of the plane relative to the ground, the heading of the plane, and the ...

*November 19, 2012*

**Physics**

A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed of the plane relative to the ground, the heading of the plane, and the ...

*November 19, 2012*

**3rd math**

Tessie multiplied 3x4, and then doubled it to find 6x8 .did she get the correct answer ? Explained

*November 13, 2012*

**Fractions**

thank you

*November 12, 2012*

**Fractions**

A technician has prepared three solutions from a 600 mL stock solution. • In preparing the first solution ½ of the original volume of the stock solution was used. • The second solution required ¼ of the remaining stock solution. • Preparation of ...

*November 12, 2012*

**Math**

Thank you

*November 12, 2012*

**Math**

I have the fraction 1/6. I need to express it as a decimal, fraction expressed with denominator 100 and percentage. Is it correct to have 0.16666; 16.66/100 and 16.66%?

*November 12, 2012*

**Math - urgent**

thank you

*November 12, 2012*

**Math - urgent**

2. A technician has prepared three solutions from a 600 mL stock solution. • In preparing the first solution ½ of the original volume of the stock solution was used. • The second solution required ¼ of the remaining stock solution. • Preparation of...

*November 12, 2012*

**Cultral Diversity**

1.Reserch about the impact of cultral valueson peer social interaction in an early education classroom may lead one to conclude that this enviroment may create biases if the primary social orientation favors:a teacher centered learning b.individual activities c.non- maintream ...

*November 11, 2012*

**Cultual Diversity**

1.A mother's eventual submission to her young child's repquests for the toy matchbox car in the hobby shop is representative of the ______ parenting style. a. laissez faire b.authoritarian c.Victorian d. democratic 2.A Native American child spent 30 minutes watching, ...

*November 11, 2012*

**Math**

That's not even one of the choices... I have the same problem. I don't understand this at all. I'm on a test, and I cant find the answer to this question. Going to online school sure has a down side.

*November 9, 2012*

**Math for Steve or someone good at math**

The answer to number one is D everyone keeps saying B

*November 8, 2012*

**chem 11**

a gas has an empirical formula C6H7O5. When put in a 50mL bulb at 120 degrees celcius and 120kPa (pressure) it's mass is determined: the mass is 10.37 times as much as C6H6O. What is the molecular formula of the gas (C6H7O5)?

*November 5, 2012*

**Chemistry 11**

a gas has an empirical formula C6H7O5. When put in a 50mL bulb at 120 degrees celcius and 120kPa (pressure) it's mass is determined: the mass is 10.37 times as much as C6H6O. What is the molecular formula of the gas (C6H7O5)?

*November 5, 2012*

**Calculus**

At a given moment, a plane passes directly above a radar station at an altitude of 7 miles. (a) If the plane's speed is 400 mph, how fast is the distance between the plane and the station changing half an hour later? (b) How fast is the distance between the plane and the ...

*November 4, 2012*

**chemistry 11**

if I was asked to set up a procedure that will allow me to check the concentration of aqueous Co2+ ions in a reaction vessel every 15 mintues, what could I do to quickly and accurately determine the concentration of colbalt ions in the solution?

*November 4, 2012*

**Culturally Diverse Background**

Will someone check my answers. 1.During a class fingerpainting activity,Doresha appeared perplexed by the teacher's question, What are you doing, Doresha did not respond quickly or with ease. Why did Doresha respond to this eventcast the way she did? a. Doresha is from a ...

*November 4, 2012*

**chemistry 11**

if a solution is contanimated with a chemical that causes a larger amount of solid, opaque particles floating in the solution, would the absorbance read too high or too low, and why?

*November 3, 2012*

**Physics**

Traveling at a speed of 15.9 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.700. What is the speed of the automobile after 2.00 s have elapsed? Ignore the effects of ...

*October 30, 2012*

**CHEMISTRY! NEED HELP FAST!**

i can't find the answer can u show me how to do the work step by step and tell me the answer my homework is due tomorrow

*October 29, 2012*

**English**

Contain some national and international news , but focus on news relating to specific area of the country. hhat type of newspaper is this ?

*October 28, 2012*

**Physics HELP!**

An airplane flies due north at 240 km/h with respect to the air. There is a wind blowing at 75 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground? __?__km/h __?__° east of north

*October 25, 2012*

**Physics!!! HELP**

An object in equilibrium has three forces exerted on it. A 36 N force acts at 90° from the x axis and a 42 N force acts at 60°. What are the magnitude and direction of the third force? __?__N __?__° (counterclockwise from the +x direction)

*October 25, 2012*

**Physics!**

Two ropes pull on a ring. One exerts a 57 N force at 30.0°, the other a 57 N force at 60.0° (a) What is the net force on the ring? Magnitude __?__N Direction __?__° (b) What are the magnitude and direction of the force that would cause the ring to be in equilibrium...

*October 25, 2012*

**Physics URGENT! PLEASE**

An object in equilibrium has three forces exerted on it. A 36 N force acts at 90° from the x axis and a 42 N force acts at 60°. What are the magnitude and direction of the third force?

*October 25, 2012*

**Math Please help!!**

Thanks for the answer, I was totally confused.

*October 23, 2012*

**Science**

This helped me a lot. Thank you.

*October 23, 2012*

**AP Physics**

A 45 kg gymnast steps off a platform located 1.3 m above a spring board. The spring board compresses 25 cm. a)What is the spring constant of the spring board? b) If energy is in fact conserved in this problem, explain how high the gymnast will spring upward. Assume the gymnast...

*October 21, 2012*

**English**

Thank you, that helped a lot!

*October 21, 2012*

**English**

In "The people could fly" what opposing forces struggle against eachother. And what is the main conflict in the story?

*October 21, 2012*