Sunday

October 23, 2016
Total # Posts: 323

**Physics**

Consider the Bohr energy expression (Equation 30.13) as it applies to singly ionized helium He+ (Z = 2) and an ionized atom with Z=4 and only a single electron orbiting the nucleus. This expression predicts equal electron energies for these two species for certain values of ...

*September 30, 2016*

**Physics**

A hydrogen atom is in the ground state. It absorbs energy and makes a transition to the n = 5 excited state. The atom returns to the ground state by emitting two photons, one in dropping to n = 4 state, and one in further dropping to the ground state. What are the photon ...

*September 30, 2016*

**Physics**

Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.60 × 10-3c. and (b) 0.972c

*September 30, 2016*

**Math**

Why would you round to nearest 100 rather than nearest 10?

*September 15, 2016*

**Math**

8(7-3*9)/8+245

*September 8, 2016*

**math**

eight time a number is ten more than three times the number...please show your work

*August 1, 2016*

**Math- HELP!**

If f(x)=3x^2 -2x -3, let g(x)=f^-1(x). Find the slope of g(x)=f^-1(x) at the point (5,2). a.) g'(5)=1/10 b.) g'(5)=1/5 c.) g'(5)=1 d.) g'(5)=2 I can't understand how to figure out this problem because I am unable to find a derivative for the function. How ...

*July 2, 2016*

**Physics- Help!!**

Thanks!!!!

*June 9, 2016*

**Physics- Help!!**

A step-up transformer is used on a 100 V line to increase the potential difference to 1200 V. If the primary has 120 turns, then what is the number of turns in the secondary coil? 1440 turns 1000 turns 100 turns 10 turns Thanks!!!!!

*June 9, 2016*

**math**

if veronica took a test and she got 80% on it and she answered them correctly then how many questions were there?

*June 1, 2016*

**Physics**

A 67.6 ohms resistor is connected in parallel with a 103.8 ohms resistor. This parallel group is connected in series with a 20.8 ohms resistor. The total combination is connected across a 18.2-V battery. Find a) the current and b) the power dissipated in the 103.8 ohms resistor.

*May 18, 2016*

**Math**

The width of a rectangle is 3 units less than the length. If the area is 70 square units, then find the dimensions of the rectangle.

*May 3, 2016*

**Physics**

An ocean liner leaves New York City and travels 25.1 degrees north of east for 110km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ships displacement vector in the directions, a) due east and b) due north

*April 19, 2016*

**SCIENCE!!**

You were correct.

*March 24, 2016*

**SCIENCE!!**

I know it's probably too late, but for anyone else it's D.

*March 24, 2016*

**Science!**

Cuz I'm cool. Is right! Thank you I had to review my answers and you helped a lot. Thanks. Also #9 is D.

*February 24, 2016*

**Math- HELP!**

Build a table to estimate lim sin(1/x) as x approaches zero. Use multiples of pi. I built a table, but do not understand why this limit does not exist. Please explain! Thank you!!

*February 20, 2016*

**Science**

Thank you guys! I got 4/4 100%. I was checking my answers and you guys helped thank you! All your answers are right.

*February 18, 2016*

**Math- HELP!**

Graph f(x)= { 4 if (0<x<4) { 5 if (4<(or equal to)x<(or equal to)10) and use the graph to evaluate the lim as x--> 4 of { 4 if (0<x<4) { 5 if (4<(or equal to)x<(or equal to)10) Please help! Thank you!!

*February 16, 2016*

**math- HELP!**

@steve yes, I did. I am confused on how to complete this problem.

*January 30, 2016*

**math- HELP!**

The Fibonacci sequence was first discovered during a study of rabbits. If newborn rabbits become adults in one month, each pair of adult rabbits produces one pair each month, and no rabbits die, then how many pairs of rabbits would be produced after seven months? How many ...

*January 30, 2016*

**Chemistry**

In the complete combustion of C3H8 (propane), how many liters of CO2 are produced from 10 liters of O2?

*January 25, 2016*

**Physics- HELP PLEASE!**

Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net electric...

*January 24, 2016*

**Maths**

Three lights all go on one changes every 5 sec one every 6 sec one every 8 sec when will they all go on together

*January 12, 2016*

** Maths **

What is the least common multipulls 5 6 8

*January 11, 2016*

**Maths**

Three lights go on together first changes every 5 sec second every 6sec third every 8 sec when is the next time they go on together

*January 11, 2016*

**maths**

Three lights go on together one changes every 5 sec one every 6 sec one every 8 sec when will they all go on together

*January 11, 2016*

**Precalculus- HELP!**

Which of the following series diverges? a) 5 + 10 + 15 + 20 +... b) 45 + 15 + 5 + 5/3 + ... c) 3/4 + 3/16 + 3/64 +.. d) 1/2 + 1/4 + 1/8 + 1/16 +... Thank you!

*January 10, 2016*

**Physics**

What is the heat required in kilocalories to convert 2 kg of ice at 0°C completely into steam at 100°C? -80 Calories -1440 Calories -4186 Calories -540 Calories Thanks!

*January 8, 2016*

**Science**

Where is the figure?

*January 8, 2016*

**math- HELP!**

Can you walk me through how to do this, please? Thanks SO much! :)

*January 2, 2016*

**math- HELP!**

The value of a particular investment follows a pattern of exponential growth. You invested money in a money market account. The value of your investment t years after your initial investment is given by the exponential growth model A=2600e^0.08t How much was initially invested...

*January 2, 2016*

**math- HELP!**

So the answer would be .408 inches/minute?

*January 1, 2016*

**math- HELP!**

Calculate the linear speed of a bicycle with 26-inch wheels being pedaled at a rate of 200 revolutions per minute. Express your answer in inches per minute rounded to the nearest whole number. (Hint: The diameter of the wheel is 26 inches.) I got: linear speed=r•w r=13 w=...

*January 1, 2016*

**Trigonometry- ??????**

Thanks!

*January 1, 2016*

**Trigonometry- ??????**

(The number of times a bicycle tire rotates in a given time period is directly related to the distance traveled in that time period. Consider the following scenarios.) 1. Calculate the angular speed of a bike with 26-inch tires rotating at 200 revolutions per minute. Express ...

*January 1, 2016*

**Algebra I**

First divide the entire equation by 2. That gives you the fraction -3-9x/3x+1. Then, divide the top part of the fraction by the bottom part which will give you a final answer of -3.

*December 30, 2015*

**Precalculus- HELP!**

The temperature in your house is controlled by a thermostat. The temperatures will vary according to the sinusoidal function: f(x)=7sin(π/12(x-11))+33 where f(x) represents the temperature in degrees Celsius (°C) and x is hours since midnight. What is the temperature ...

*December 30, 2015*

**Physics**

The intensity of sound is x W/m2 at a distance of 5 m from the source. What is the intensity of the sound at a distance of 20 m from the source? I am not sure how to do this problem. Thank you for your help!

*December 26, 2015*

**Trigonometry- ??????**

Solve the equation for 0≤ x ≤ 180 given tan(x) sin^2(x)=2tan(x) How do I do this? Thank you and Merry Christmas! :)

*December 24, 2015*

**Trigonometry- Help!**

After one hour in flight, an airplane is located 200 miles north and 300 miles west of the airport. What is the magnitude of the plane's velocity? Round your answer to the nearest mile per hour. a) 22 miles per hour b) 128 miles per hour c )256 miles per hour d) 361 miles ...

*December 17, 2015*

**Algebra worksheet**

@tbh and @Reiny are right! Those are the correct answers.

*December 9, 2015*

**Pre Calculus HELP!?**

The length of a day in Philadelphia, Pennsylvania, is given by the sinusoidal function, f(t), which represents the number of hours of daylight t days into the year: f(t)= 10+2.8sin(2pi/365)*(t-1.35). How many hours of daylight are there on the 100th day of the year? Round the ...

*November 26, 2015*

**Pre-Calculus HELP!!**

The length of a day in Philadelphia, Pennsylvania, is given by the sinusoidal function, f(t), which represents the number of hours of daylight t days into the year: f(x)=11+2.2sin(2pi/365)t-1.25).How many hours of daylight are there on the twelfth day of the year? Round the ...

*November 26, 2015*

**Pre-Calculus HELP!**

Thank you!

*November 25, 2015*

**Pre-Calculus HELP!**

Explain how the transformations of the functions f(x)=15sin(x) and f(x)=sin(x)+15 differ. I see that f(x)=sin(x)+15 experiences a vertical shift, but I am not sure about the transformation that f(x)=15sin(x) experiences. Thank you for your help!

*November 25, 2015*

**English**

The answer to Question #6 should read: There are many bears here. They can smell well, so please put all your food in the bear box. Question #8: It is for keeping travelers' food safe. Question #9: Tomorrow they're going to go fishing. Question #11: They went to Mirror...

*November 25, 2015*

**World History**

I'm trying to find helpful websites that help in answering these specific questions under each main topic. I'm not finding any appropriate sources.

*November 20, 2015*

**World History**

1.) INDUSTRIAL REVOLUTION: Why is there such a massive gap in the world today between rich and poor nations? 2.) IMPERIALISM: How does imperialism continue to affect the world we live in? 3.) WORLD WAR I: How did World War I and new scientific advances affect Western culture? ...

*November 20, 2015*

**Precalculus**

1.) Use sigma notation to describe the sum of the first ten terms of the arithmetic sequence. 20+18.5+17+15.5+14+12.5+11+9.5+8+6.5 2.)Use sigma notation to describe the sum of the first ten terms of the geometric sequence. (40)+(-10)+(5/2)+(-5/8)+(5/32)+(-5/126)+(5/512)+(-5/...

*November 14, 2015*

**Language Arts**

From an hour with Abuelo: which paragraphs represent the exposition in Abuelo's story? paragraphs 8–10 paragraphs 10–12 paragraphs 12–14 paragraphs 14–15 *** (i chose number 4)14-15

*November 13, 2015*

**Precalculus**

I have two questions: 1. You want to make an investment in a continuously compounding account earning 18% interest. How many years will it take for your investment to double in value? Round the logarithm value to the nearest thousandth. Round the answer to the nearest year. 2...

*November 1, 2015*

**Precalculus**

You want to make an investment in a continuously compounding account over a period of two years. What interest rate is required for your investment to double in that time period? Round the logarithm value and the answer to the nearest tenth.

*November 1, 2015*

**Science**

Anon, Fantastic, and FallenAngel are all correct I got 100% 5/5 with their help because I was checking over my answers. Thank you!

*October 21, 2015*

**Bubbles**

She just wanted you guys to confirm her answers,not tell her the answers, and you guys are being very rude about it.

*October 19, 2015*

**Health class**

---- are nutrients that are needed for growth and repair of the body's tissues. Carbohydrates Fats Fibers Proteins

*October 9, 2015*

**Heath class**

Which of the following foods is usually highest in protein? Apple Chicken Bread Candy bar

*October 9, 2015*

**physics**

Thank you so much Damon!

*October 4, 2015*

**physics**

I need help understanding these, please. Thanks! 1. A 2 kg body moves with constant velocity when a force of 10 N is applied. What is the coefficient of kinetic friction between the table and the body? (Would I use F=m*g for this??) 2. Which of the following statements is ...

*October 4, 2015*

**Algebra 1**

The manager of a band recommends that the band sell its CDs for $8.75. The band decides to sell the CD for p dollars. A) Write an absolute value expression that tells how far the bands price is from the recommended price. B) The band wants the price of its CD to be no more ...

*October 4, 2015*

**Health, Safety, and Nutrition**

Which if the following is a mandatory standard? (1 point) 1) Food Labels 2) National Health and Safety Standard 3) dietary reference 4) Childmand adult care food program *Havng a hard time finding it in the book

*September 30, 2015*

**Calculus**

The Norman window illustrated below has a semicircular section on top of a rectangle. The radius of the semicircle is x. The long side of the rectangle is three times the radius of the semicircle. a)Express the total area of the window, A, as a function of x. b) Express the ...

*September 25, 2015*

**P6 maths**

Thank you so much

*September 19, 2015*

**P6 maths **

Mrs Raja and Mrs lee have some eggs to sell. If mrs raja sells 30 eggs per day and mrs lee sells 15 eggs per day , mrs lee will still have 610 eggs left when mrs raja has sold all her eggs . If mrs lee sells 30 eggs per day and mrs raja sells 10 eggs per day , mrs lee will ...

*September 19, 2015*

**Pre-calculus- URGENT**

Convert the rectangular coordinate (-8,i (square root of 3) into polar coordinates. How do I do this?? I tried every way I knew of to convert the y coordinate (i (square root of three)) to polar form, but it didn't work. I think that the polar form of the x coordinate is ...

*September 13, 2015*

**College Algebra**

1. The answer would be m=11. To find this answer, you need to multiply each side of the equation by the LCM (in this case it would be (m+2)(m-3). After doing this, the denominators of both sides will be rationalized, and you will be able to solve for m. Hope this helps! :)

*September 13, 2015*

**Pre-calculus**

write the complex number -5 in polar form. I don't get how to do this because arctan of b/a would be 5/0 which is a fraction with no solution. Also, is a zero? Sorry if I'm being confusing! Thank you!

*September 12, 2015*

**AP English**

Analyze the validity of the following argument: Sally argues, "Mom, your rules are way too strict! Melissa's mother lets her stay out until 2:00 AM on weekends. Peter's parents let him go to all-night raves even on school nights. Tom's parents don't even ...

*September 10, 2015*

**Precalculus**

#1.) Write (1-i)^10 in a+bi form. #2.) Write (1+i)^20 in a+bi form. How do I do these? Thanks!

*September 7, 2015*

**Pre-Calculus HELP!**

change the polar equation r=5/1+cos(theta) to rectangular form. How do I do this? Thank you! :)

*September 6, 2015*

**Physics-PLEASE HELP**

Btw the answers I gave above are positive values, not negative values. Sorry for any confusion.

*August 20, 2015*

**Physics-PLEASE HELP**

A man walks for 5 km/hr for 1 km and 7 km/hr for next 1 km. What is his average speed for the walk of 2 km? -5.8 km/hr -6.0 km/hr -2.0 km/hr -1.0 km/hr Thank you very much!!

*August 20, 2015*

**french**

And i also want to ask you.. what is the proper translation of "Do not run" would it be Ne courez pas or ne pas courir. i think it is ne pas courir

*July 22, 2015*

**french**

1. When he states at the end of the play before he dies "My panache" 2. When Cyrano picks up the panache of de guiche at battle and im not sure of a third one..

*July 21, 2015*

**french**

There is no identity crisis And thats fine

*July 21, 2015*

**french**

Three ways Cyrano in the play Cyrano de Bergerac show his panache?

*July 21, 2015*

**french**

My question is my opinion on what? about the panache de cyrano?

*July 21, 2015*

**Math**

The aswer for this set of questions is 4:D. For the one I had it was B:Sam's.

*May 8, 2015*

**Math Calc**

A factory produces bicycles at a rate of 100+0.4t2−0.7t bicycles per week (t in weeks). How many bicycles were produced from day 15 to 28? Hint: the lower limit of integration should be the integer number of weeks preceding day 15, i.e. a=2, and the final answer should ...

*April 28, 2015*

**writing skills**

2. Because information listed on a website can change from day to day, _______ must be included in the end citation on the Works Cited page.A. the title of the siteB. the publication dateC. the date of accessD. the URLStudent Answer: B&...

*April 1, 2015*

**Art**

Tona Malo is 3/3 100% correct. Thank you I was reviewing and this helped.

*March 31, 2015*

**english**

Did you hear the good news? No, I haven't. I got a promotion at my hob Did you really? well congratulations Im so happy for you Really? yes, good for you do you think so? yes you really deserved this thank you

*March 27, 2015*

**Math**

9*3.14*1.2=33.912

*March 26, 2015*

**Astronomy **

Imagine that the asteroid A that has an escape velocity of 50m/s. If asteroid B has twice the mass and twice the radius it would have an escape velocity _______ the escape velocity of asteroid A

*March 26, 2015*

**ART**

That Girl is 100% 4/4 correct! Thank you!

*March 10, 2015*

**Chemistry**

If 22 mol of benzene are completely reacted with molecular oxygen, how many moles of carbon dioxide will be produced?

*February 10, 2015*

**college chemistry **

calculate the average kinetic energies of CH4 and N2 molecules at 273k and 546k

*January 20, 2015*

**Math**

Points P and Q are tries toom points on segment AB. If AQ =7x+6 and PQ= 3x+5, find all possible values for the length of AB. So far I've established that 4x+1 is the length of AP and QB So the total length of AB should be 11x+7 I think, I'm not sure how to solve and ...

*January 8, 2015*

**CHEMISTRY-URGENT**

Thank you very much!!

*January 6, 2015*

**CHEMISTRY-URGENT**

A 4.43 gram sample of phosphorus was burned in air to produce 10.15 g of an oxide. What's the empirical formula of this compound?

*January 6, 2015*

**language arts**

Well for question 3 if we take the word nonchalant, what does it mean? Then go from there.

*December 10, 2014*

**physics**

There are 4 significant figures.

*December 5, 2014*

**chemistry-URGENT**

how many moles of atoms are contained in 7.654 x 10^32 atoms of Ga ? Thank you!

*December 2, 2014*

**Chemistry**

How many moles of atoms are contained in 5.60 grams of Sulfur? Can someone help me understand how to work out other problems like these as well? Thank you!!

*December 2, 2014*

**Math **

Larry and Gary are discussing whose garden has the most area to plant flowers. Larry claims that all they have to do is walk around the two gardens to get the perimeter and the one with the greatest perimeter has the greatest area. How would you help these students?

*October 14, 2014*

**3 grade math**

How can I find the area of an angle?" How do you respond?

*October 14, 2014*

**physics**

Jordan throws a golfball straight up from the top of a building 50 meters high. The initial speed of the golfball is 20 m/s and it just misses the edge of the roof when it eventually falls. Neglecting air resistance, find the velocity of the golfball just at the instant it ...

*October 12, 2014*

**Chemistry URGENT!!**

Which anions have the largest and smallest radii? Thank you!!

*October 10, 2014*

**Chemistry**

Which positive ion (cation) has the smallest radius? Please help! Thanks!

*October 10, 2014*

**Math**

For how many values of n where n is a positive integer less than 10 is n+1/2 an integer? A) None B) One C) Three D) Four E) Five Please I would like some help explaining how to get the answer :)

*September 24, 2014*