Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 681

**Physics**

A helicopter hovers above the north magnetic field pole in a magnetic filed of magnitude 0.5G perpendicular to the ground. The helicopter rotors are 10m long, are made of aluminum, and rotate about the hub with a rotational speed of 10 000 rpm. What is the potential difference...
*November 13, 2011*

**Physics**

The current in a very long, tightly wound solenoid with radius a and n turns per munit length varies in time according to the equation i(t)=Ct^2, where the current i is in amps and the time t is in seconds, and C is constant with appropriate units. Concentric with the solenoid...
*November 13, 2011*

**Physics**

A helicopter hovers above the north magnetic field pole in a magnetic filed of magnitude 0.5G perpendicular to the ground. The helicopter rotors are 10m long, are made of aluminum, and rotate about the hub with a rotational speed of 10 000 rpm. What is the potential difference...
*November 13, 2011*

**Physics**

A man 1.80 m tall walks at 2.00m/s perpendicular to a horizontal magnetic field of 5.0 T; that is, he walks between the pole faces of a very big magnet. Given that his body is full of conducting fluids, estimate the potential difference induced between his head and feet. I ...
*November 13, 2011*

**Physics**

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...
*November 13, 2011*

**Physics**

The current in a very long, tightly wound solenoid with radius a and n turns per munit length varies in time according to the equation i(t)=Ct^2, where the current i is in amps and the time t is in seconds, and C is constant with appropriate units. Concentric with the solenoid...
*November 13, 2011*

**Physics**

So now I noticed that, if I multiply the number of turns to my previous answer, I get .24 V. But I don't know why that must be done.
*November 13, 2011*

**Physics**

A solenoid with 200 turns and a cross sectional area of 60 cm^2 has a magnetic field of .60 T along its axis. If the field is confined within the solenoid and changes at a rate of .20 T/s, the magnitude of the induced potential difference in the solenoid will be: a) .00020V b...
*November 13, 2011*

**7th Grade English**

done !
*November 11, 2011*

**physics**

my answer for these are 1. a 2.c 3 d but not sure so please anyone see if i am correct 1. In which of the following cases is work done on the object? A. Lifting an object off the floor. B. Pushing an object, but it does not move C. Carrying an object at a constant velocity D. ...
*November 6, 2011*

**physics**

A child runs down his driveway with an initial speed of 3.0 m/s for 4.5 s, and then uniformly decreases his speed to 0.0 m/s in 2.5 s. What is the boy’s acceleration during the second part of his motion?
*November 5, 2011*

**Math**

52.2600.
*October 26, 2011*

**chemistry**

what happens to energy released by an exothermic enthalpy change??
*October 18, 2011*

**Math**

my home work is hard because it say...The secret number has a 7 in the ones place the tens number is an odd number and i though it will be 87.
*October 18, 2011*

**Science **

thanks
*October 17, 2011*

**Science **

what kind of plants have life cycle that last several years?
*October 17, 2011*

**Science **

what type of plants that leave several years?
*October 17, 2011*

**Botany **

what kind of plants have life cycle that last several years?
*October 17, 2011*

**botany**

becaue they have seeds
*October 17, 2011*

**botany**

why are green algae classified as plants and noy proyists?
*October 17, 2011*

**chemistry**

The density of dry air measured at 25 degrees celsius is 1.19 x 10 to the negative 3 g/cm cubed. What is the volume of 50.0g of air?
*October 13, 2011*

**math**

303 & 55
*October 12, 2011*

**Math**

Salma invested her savings in two investment funds. The that she invested in Fund A returned a profit. The amount that she invested in Fund B returned a profit. How much did she invest in Fund B, if both funds together returned a profit?
*October 11, 2011*

**science**

A Kid applies a force of 70 Newtons to a ball over 1.1 meters.How much work did he do on the ball?
*October 11, 2011*

**French 2**

Complete the names of the dishes une omelette___fines herbes avec des frites et une salade une glace___chocolat
*September 28, 2011*

**maths**

the mean of a set of test scores is 64. a new student takes the same test and scores 80 marks. when his score is added to the other scores, the mean increases to 65. how many students sat for the test altogether?
*September 24, 2011*

**Sociological**

There are three primary sociological theries discussed in Chapter One of the text, Introduction to Sociology. Briefly summarize each theory and the major differences across the Functionalist, Conflict, and Symbolic Interaction perspective.
*September 23, 2011*

**math**

how do you find all the real zeros for this function f(x)=x^3+9x^2-4x-36
*September 21, 2011*

**chemistry**

How do the boiling points of 3.0 m C6H12O6 and 3.0 m CaCl2 compare? A. The boiling point of 3.0 m C6H12O6 is higher. B. The boiling point of 3.0 m CaCl2 is higher. C. They are the same. D. The difference cannot be determined from the information given. I think the answer is D...
*September 15, 2011*

**science**

A 63 kg boy and a 44 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 1.7 m/s 2 , determine the magnitude of the acceleration of the boy toward the girl
*September 12, 2011*

**geometry**

Referring to this figure what is the difference in the meaning between the notaions QR( with a line over it) and QR?
*August 31, 2011*

**basic dressmaking processes**

1.A Correct 2.D Incorrect PAGES 1-2 3.B Incorrect PAGE 5 4.C Incorrect PAGE 8 5.A Correct 6.D Correct 7.C Incorrect PAGE 18 8.B Incorrect PAGE 32 9.C Incorrect PAGE 37 10.D Correct 11.C Incorrect PAGE 39 12.C Incorrect PAGE 44 13.A Correct 14.B Correct 15.D Correct 16.C ...
*August 30, 2011*

**physics**

I am having so much trouble with this D: A rocket is traveling straight up from its launch pad. An observer 5.00 km from the launch pad notices that at one instant, she must tilt her telescope 45.0 degrees upward to see the rocket. 10.0 seconds later, she must tilt her rocket ...
*August 25, 2011*

**8th Math**

How do I substract a whole number from a fraction ?!?!?!
*August 24, 2011*

**science**

A diesel engine's piston compresses 16 cm3 of fuel-air mixture into 1 cm3. The pressure changes from 1 atmosphere to 48 atmospheres. If the initial temperature of the gas was 305 K, what was the final temperature? Note: As long as the units for pressure and volume are the ...
*June 21, 2011*

**physics**

in the model ,how far away from the earth would the sun be?
*June 18, 2011*

**chemistry**

What volume does 627 cm3 of a gas at 14°C occupy at 40°C, if the pressure does not change?
*June 16, 2011*

**math**

ã2x+4=4
*May 25, 2011*

**math**

Solve the radical equation: √300 or ã300
*May 25, 2011*

**math**

Simplify: 5/8 divided by 15/16 + 1/2
*May 25, 2011*

**geometry**

How do you find the slope-intercept equation of medians of a triangle and perpendicular bisectors of a triangle?
*May 22, 2011*

**English**

Discuss any areas related to citing sources that you find confusing or difficult understand or apply. In your responses to others offer suggestions to help understand the issue.
*May 18, 2011*

**Science**

What are the properties of iron sulphide?
*May 16, 2011*

**Math**

-20=-4x-6x
*May 2, 2011*

**Math**

A child's train ticket costs $7. That is 1/4 as much as an adult's ticket. How much does an adult's train ticket cost?
*April 27, 2011*

**English **

Describe the confrontation between Ralph and Jack in Chapter 6 of Lord of the Flies.
*April 26, 2011*

**general chemistry**

Calculate the molar mass that would be obtained from the actul experimental data under the following conditions. The unknown is mehy propy ether (CH3OC3H7) which has the vapor pressure of 375.2 torr at room temperature, 20C. The volume of the flask is 135mL, the temperature of...
*April 24, 2011*

**Math**

Sally's grandfather is 67 and Sally is 19. At what age will Sally be exactly 1/3 of her grandfathers age? How old will her grandfather be then?
*April 20, 2011*

**Science**

How can you prove that sound travels faster through fresh water than through air?
*April 12, 2011*

**English**

What is the structure and language of the poem Young by Anne Sexton?
*April 5, 2011*

**Math- Integrated math 4. **

From the function rule h(t)=60t-16t^2+2. How do we tell from the graph and the table whe h'(t) will be positive, where it will be negative, and where it is zero.
*April 2, 2011*

**Chemistry**

A sample if liquid water (30g)heats up from an initial temperature of 20C to 78C. How much energy did it take in?
*March 30, 2011*

**math**

alexis sells stuffed animals.she sells a stuffed elephant for $34.95,and the sales tax is 8% of the sales price.about how much is the sales tax on the elephant?
*March 23, 2011*

**math**

for a set of three elements find the number of different subsets of 2 elements.use row 3 of pascals triangle
*March 15, 2011*

**7th grade math**

Barry has scores of 93 84 86 and 75. He wants to raise the mean to 86.
*March 2, 2011*

**Math**

An equilateral triangle has the same sides. If one the sides measure 1.5 meters. What is it's perimeter ?
*February 26, 2011*

**3rd grade math hw help!**

84x6
*February 24, 2011*

**3rd grade math hw help!**

84x6=
*February 24, 2011*

**AP CHEMISTRY**

How many moles of Cu are produced when .25 moles of Cu2Se are completely reduced by an excess of hydrogen gas? Any help is appreciated!
*February 20, 2011*

**math**

Without writing them all out, what is the number of subsets of set A = {tongue, ear, mouth, eye, nose, cheek, forehead, neck, shoulder}?
*February 20, 2011*

**Physics**

A current of 1.03 A flows in a wire. How many electrons are flowing past any point in the wire per second? The charge on one electron is 1.60 10-19 C
*February 11, 2011*

**College Physics**

A current of 1.03 A flows in a wire. How many electrons are flowing past any point in the wire per second? The charge on one electron is 1.60 10-19 C
*February 10, 2011*

**Chemistry**

WRITE THE BALANCED CHEMICAL EQUATION,WRITE THE OVERALL IONIC EQUATION,IDENTIFY THE SPECTOR IONS AND POSSIBLE PRECIPITATES,WRITE THE NET IONIC EQUATION FOR mercury(II)chloride(aq)+potassium sulfide(aq)
*February 9, 2011*

**geometry**

If I leave the first building going to the second building, what would be the location of the half way point on the grid?
*February 1, 2011*

**Algebra 1**

a train leaves a city heading west and travels at 50 miles per hour. three hours later, a second train laeves from the same place and travels in the same directionat 65 per hour. how long will it take for the second train to overtake first train?
*January 27, 2011*

**calculus**

if f x is the slope of a trail at a distance of x miles from the start of the trail what does the definite integral of (f)xdx when x=3 to x=5 represent
*January 24, 2011*

**Algebra**

What is the first term of an arithmetic sequence with a common difference of 5 and a sixth term of 40 ?
*January 20, 2011*

**chemistry**

Given the following equation: Mg(s)+2HCl(aq) goes to MgCl2(s)+H2(g) How many grams of hydrogen chloride (HCl) are needed to produce 200g of hydrogen H2?
*January 17, 2011*

**Shakespeare**

Oh sweet, thanks bobpursely for the modern prologue example:)
*January 12, 2011*

**Shakespeare**

Oh alright, thank you Writeacher:D
*January 12, 2011*

**Shakespeare**

Thanks those websites are great:) COuld I know why this line is so important? "If you ever disturb our streets again, Your lives shall pay for the forfeit of the peace."
*January 12, 2011*

**Shakespeare**

We are learning about Romeo and Juliet. And its my first time learning about them. And Im just wondering about the literature that Shakepeare uses, like its so strong and so different from the literature of today. I have a few general questions on it, I would really like to ...
*January 12, 2011*

**8th grade science**

4353727
*January 5, 2011*

**algebra 2**

If $8,500 is deposited in a compound interest account paying 3.9% interest annually, how much will be in the account after 12 years?
*December 3, 2010*

**geometry**

if arc BC is 42 degrees and angle 5 is 32 degrees what is the measure of arc DE?
*November 30, 2010*

**Chemistry**

Draw a model of a solution in which water (h2o) is the solvent and carbon dioxide gas (co2) is the solute?
*November 27, 2010*

**7th grade math**

30=12d, this means 30 is equal to 12*? You have to find the missing variable, so d would equal 2.5, or 2 1/2
*November 26, 2010*

**Math**

What is 13y-2x-12-15y
*November 16, 2010*

**calculus**

thank you very much
*November 12, 2010*

**calculus**

A man starts walking north at 2ft/s from a point P. Twenty-five seconds later a woman starts walking south at 3ft/s from a point 400ft due east of P. At what rate are the people moving apart 50 seconds after the woman starts walking? Do not include units in your answer.
*November 12, 2010*

**visual art**

what are warm colors
*November 9, 2010*

**math**

suppose a parallelogram has an area of 84 square units. Describe a triangle related to this parallelogram, and find the triangle's area, base, and height.
*November 8, 2010*

**sculpture**

she wants me to Compare the ancient monument of Stonehenge in England to the modern sculpture made by David Smith called “Cubi Series.” Conduct a brief internet search on each of these to learn more about them and then answer compare and contrast questions.plzzz help
*October 28, 2010*

**4th grade science**

acrostic poem for alphabet that relates to physiscal science
*October 25, 2010*

**english**

A critic should read a story more than once in order to write about it. true or false
*October 15, 2010*

**8th grade math**

what is 66/99 in lowest terms or reduced
*October 13, 2010*

**spanish**

Isabel una chica norteamericana uses of the ver ser
*October 11, 2010*

**U.S. History**

True
*October 8, 2010*

**science**

i think i need to learn about fossils right now i belive .
*October 6, 2010*

**CIS 105**

Most personal computers come equipped with a version of the Windows operating system, whereas Apple personal computers have a different operating system. Other choices are also available, such as UNIX and Linux. Why do you think Windows is so prevalent? What do the other ...
*October 5, 2010*

**AED 201**

Are there certain curricular areas in which technology is more useful than in others? Explain your answer
*October 5, 2010*

**Math**

find the percent of decrease. round to the nearest tenth if necessary from 49 cm to 34 cm
*September 27, 2010*

**start**

the matrials commnly used to sheild living begings from potentially harmful radiactivily includes
*September 24, 2010*

**AED 201**

Post an informed statement from a parent's point of view that is meant to persuade voters to support your position. School choice will create greater stratification and segregation among public schools.
*September 23, 2010*

**AED 201**

Okay, but I still don't understand. Can you explain this a little more like in details please?
*September 21, 2010*

**AED 201**

Determine which factors may explain that most of the higher per-pupil expenditures are found in the Northeastern and upper-Midwest states and the lower per-pupil expenditures are found in the South and West. In your opinion, what must happen to create a balance in school ...
*September 21, 2010*

**algebra**

What is 8.9 + 1.2(3a-1)=14.9 ?
*September 18, 2010*

**math**

how to find the x and y intercept of cubic functions
*September 18, 2010*

**3rd grade**

explain how you can use a hundred chart to subtract 12 from 46
*September 15, 2010*

**education**

When i read this... It stated to find barriers not mention in the textbook... so can you give us some barriers that arent mentioned in the textbook for education
*September 14, 2010*

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