# Ellie

Most popular questions and responses by Ellie-
## Pre-Calculus HELP!

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

*asked on September 6, 2015* -
## Physics

At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide

*asked on February 4, 2013* -
## chemistry

hello i am having trouble writing these two ionic equations. could someone explain to me how to do that? 1.)K2SO4(aq) and Na2CO3(aq).Write the ionic equation. 2.)RbCl(aq) and KOH(aq).Write the ionic equation.

*asked on November 4, 2013* -
## 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

*asked on November 1, 2015* -
## ELA

What is the best summary of the speakers basic message in Annabel Lee? I am heartbroken and I will never stop loving annabel lee.* Annabel Lee and I were friends from the time we were children. I am heartbroken I will and I will get revenge for Annabel

*asked on February 27, 2017* -
## 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

*asked on November 26, 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

*asked on November 13, 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

*asked on March 26, 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

*asked on December 30, 2015* -
## Social Studies

Discuss the social reforms that shaped the nation in the 1800s. What do you think have been the lasting impacts of the Reform Era? How do these reforms influence society today? What do you think were the most important social reforms and why?

*asked on November 29, 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

*asked on January 2, 2016* -
## Chemistry

Given the following heats of combustion. CH3OH(l) + 3/2 O2(g) CO2(g) + 2 H2O(l) ΔH°rxn = -726.4 kJ C(graphite) + O2(g) CO2(g) ΔH°rxn = -393.5 kJ H2(g) + 1/2 O2(g) H2O(l) ΔH°rxn = -285.8 kJ Calculate the enthalpy of formation of methanol (CH3OH) from

*asked on September 18, 2011* -
## 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

*asked on January 30, 2016* -
## 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.

*asked on November 1, 2015* -
## art social studies

Which of the following did the development of linear perspective allow artists to do?

*asked on January 20, 2019* -
## Physics

During a car crash a 65kg person's head goes from traveling at 50km h-1 to stationary in 0.15s. (a)What is the magnitude of the average net force acting on the head of a person with a 4.5kg head? (b)How does this compare with the weight force acting on the

*asked on September 21, 2012* -
## 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

*asked on December 17, 2015* -
## chemistry

what is the standard enthalpy formation of liquid diethylamine (CH3CH2)2 NH? N2O5(g) + 8CH4(g) ==> 2(CH3CH2)2NH(l) +5H2O(l), delta H= -1103kJ

*asked on June 21, 2010* -
## chemistry

the molar mass of an unknown gas was measured by an effusion experiment. it took 63s for te gas to effuse. where as nitrogen gas took 48sec. what is the molar mass of the gas? 32g/mol 37g/mol 24g/mol 16g/mol 48g/mol

*asked on June 21, 2010* -
## 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

*asked on September 30, 2016* -
## math

a number line below -5 -4 -3 -2 -1 0 1 2 3 4 5 Which of the expressions below represent the distance between -4 and 5 on the number line? [ ]= absolute value symbol A. [-4+5] B.[4-5] C.[-4-5] d.[-5-(-4)] I believe it is D, since the absolute value of a

*asked on March 29, 2013* -
## 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

*asked on November 26, 2015* -
## college chemistry

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

*asked on January 20, 2015* -
## 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

*asked on January 1, 2016* -
## 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

*asked on October 14, 2014* -
## modern world studies

an isthmus is a(n) a. very tall mountain. b. unique land formation. c. body of water. d. flat grassland region.

*asked on March 15, 2018* -
## Biology

3. You begin with one cell that contains twelve chromosomes. This cell undergoes one mitotic division (you need to know the end result of mitosis to get this answer right). a. How many cells will you end up with after the cell divides? (1 point) b. How

*asked on January 10, 2019* -
## Physics

An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)

*asked on September 21, 2012* -
## Physics

How do I do these? A passenger at an airport steps onto a moving sidewalk that is 100.0 m long and is moving at a speed of 1.5 m/s. The passenger then starts walking at a speed of 1.0 m/s in the same direction as the sidewalk is moving. What is the

*asked on October 29, 2006* -
## Math

a park is 3/4 mile long and 1/2mile wide. Which fraction represents the ratio of the parks length to its width? I did it by 3/4 divided by 1/2 this equals 1 1/2 or 3/2 Is this correct?

*asked on March 28, 2013* -
## Math

The pizza shop offers the top being shown below how many different three topping pizzas can you make pepperoni mushrooms sausage onion ham 6 10 4* 5

*asked on March 1, 2017* -
## chemistry

Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy

*asked on December 6, 2013* -
## 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

*asked on January 1, 2016* -
## english 4

Sandy's throw to first base was short. what is the subject and verb etc..

*asked on March 22, 2012* -
## math

a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss? I think it is 1/2 because the coin has 2 sides and 50% it will land on heads. My friend thinks

*asked on May 12, 2013* -
## chemistry

In the formation of smog, nitrogen and oxygen gas react to form nitrogen dioxide: N2(g)+2O2(g)→2NO2(g)How many grams of NO2 will be produced when 2.1L of nitrogen at 840mmHg and 28∘C are completely reacted? I know that you use the equation n=PV/RT to

*asked on October 26, 2013* -
## Chemistry. Please help!

Fe3+ + I1- ¨ Fe2+ + I2 1. Balance the equation 2. Which element is being oxidized? 3. Which element is the reducing agent?

*asked on February 20, 2013* -
## 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!

*asked on November 25, 2015* -
## 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!!!!!

*asked on June 9, 2016* -
## 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

*asked on November 20, 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

*asked on 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

*asked on September 30, 2015* -
## 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!

*asked on January 8, 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

*asked on September 30, 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

*asked on January 24, 2016* -
## 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.

*asked on November 14, 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

*asked on April 28, 2015* -
## Physics

If a pendulum-driven clock gains 5.00 s/day, what fractional change in pendulum length must be made for it to keep perfect time? Please provide explanations and solutions. Thanks in advance :D

*asked on February 4, 2013* -
## Physics

The Earth has a mass of 5.97 x10^24 kg and the Moon has a mass of 7.36 x10^22kg. The average distance between the center of the Earth and the center of the moon is 3.84 x10^8m. (a) How far away would the Moon need to be for the magnitude of the

*asked on September 21, 2012* -
## math

How do I find the quotient of x/2y and (2xy)^2/9xy^3

*asked on March 8, 2019* -
## Geometry

A sailboat is heading directly north at a speed of 16 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.4 knots. (Both velocities are given relative to the Earth.) Determine the magnitude and direction of the wind velocity

*asked on February 3, 2017* -
## Physics

An 8g bullet leaves a gun at 700ms-1. (a) what is the maximum height that this bullet could reach (ignoring air resistance)

*asked on September 21, 2012* -
## 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

*asked on September 30, 2016* -
## MAth

What is the HCF of 52?

*asked on July 16, 2018* -
## chemistry

what is the oxidizing agent in the equation 8H(aq)+ 6Cl(aq)+ Sn(s)+ 4NO3(aq)yields SnCl6(aq)+ 4NO2(g)+ 4H2O

*asked on June 19, 2010* -
## algebra

Find the second, fourth, and tenth terms of the sequence described the the rule. A(n)=4+(n-1)(8)

*asked on May 24, 2017* -
## Chemistry

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

*asked on January 25, 2016* -
## Physics

Two 30kg children in a 20 kg cart are stationary at the top of a hill. They start rolling down the 80m tall hill and they are traveling at 30 km h-1 when they reach the bottom. (The cart had brakes!) How much work was done on the cart by friction during

*asked on September 21, 2012* -
## Physics

The moment of inertia of an object depends on the shape of the object, location and orientation of the axis of rotation. For a solid disk, when the disk is rotating about an axis that is perpendicular to the disk and passing through the center of the disk,

*asked on October 29, 2009* -
## math

Determine the seating capacity of an auditorium with 10 rows of seats if there are 10 seats in the first row, 16 seats in the second row, 22 seats in the third row, 28 seats in the forth row, and so on ???

*asked on October 25, 2009* -
## chemistry

I am having trouble understanding what the concept is for writing these out. Write a balanced nuclear equation for the alpha decay of each of the following radioactive isotopes: curium-243, 22589Ac

*asked on December 5, 2013* -
## chemistry

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(lIf 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?)

*asked on December 3, 2013* -
## trig

Find all solutions in the interval [0, 360) 8cos^2x+6cosx+1=0

*asked on April 23, 2017* -
## 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!

*asked on December 26, 2015* -
## Physics

A bullet of mass 4.8 g strikes a ballistic pendulum of mass 3.3 kg. The center of mass of the pendulum rises a vertical distance of 9.7 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed. ....I'm getting an

*asked on October 31, 2011* -
## french

thank you so much for taking so much time into helping me perfect my french essay I have done the corrections you have told me to do and I was wondering if you could go through and make sure the lanuage and grammar are all perfect. And thank you I really

*asked on October 26, 2011* -
## chemistry

a 3.35g sample of solid silver reacted in excess chlorine gass to give a 4.45g sample of pure solid AgCl. the heat given off was 3.95kJ at constant pressure. what is th enthalpy of formation of AgCl?

*asked on June 21, 2010* -
## Language arts

What would you expect to be Downy? A diamond ring A baby rabbit * A pair of jeans A fallen pine cone In which sentence do the subject and verbs agree? Both cats and dogs sometimes gets fleas. Neither Philip nor Angie wants to cancel the show.* Automobiles

*asked on February 27, 2017* -
## Health class

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

*asked on October 9, 2015* -
## More Physics

The diagram below indicates three positions to which a woman travels. She starts at position A, travels 3.0 km to the west to point B, then 6.0 km to the north to point C. She then backtracks, and travels 2.0 km to the south to point D. a) What is the

*asked on October 29, 2006* -
## Geometry

What is the ratio measures of the in-radius, circum-radius and one of the ex-radius of an equilateral triangle? (1) 1 : 2 : 5 (2) 1 : 3 : 5 (3) 1 : 2 : 3**** (4) 1 : 1.4142 : 2

*asked on March 8, 2018* -
## Heath class

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

*asked on October 9, 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

*asked on September 13, 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!

*asked on September 7, 2015* -
## science

An insect inside a bus flies from the back toward the front at 2 m/a. The bus is moving in a straight line at 2m/a. What is the speed of the insect?

*asked on September 7, 2013* -
## chemistry

A 51 kg person drinks 330. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in

*asked on September 18, 2011* -
## Spanish 7th grade

I have a question about how to answer this If something is dulce, one would probably want to drink lemonade or a sour drink with it. I know dulce is sweet in Spanish but I don't get the correlation-or is it if you eat something sweet, you want to offset it

*asked on March 13, 2011* -
## Physics

A crane is lifting a 500kg payload straight up at a constant speed of 0.7ms-1. (a)What is the power output of the crane. (ignoring losses)? (b)If it takes the cran2 2 minutes to raise the payload to its final height, how far above the ground is this? (c)If

*asked on September 21, 2012* -
## Chemistry

A precipitate will be formed when an aqueous carbonic acid soution is added to what other aqueous solution? A. ammonium chloride B. calcium hydroxide C. Sodium Chloride D. Potassium carbonate E. Nitrous acid

*asked on June 19, 2010* -
## Physics

Consider a child standing on a beach who gets hit by a wave. The child weighs 30 kg, and the portion of the wave that hits the child contained 60 kg water. If the wave had a period of 2 seconds and a wavelength of 6 meters, how fast will the child be

*asked on February 9, 2017* -
## Math

1. 2(x-3)=2x A. One solution B. No solutions C. Infinitely many solutions 2. 3(y-3)=2y-9+y A. One solution B. No solutions C. Infinitely many solutions 3. 10x-2-6x=3x-2+x A. One solution B. No solutions C. Infinitely many solutions 4. 4(x+3)+2x=x-8 A. One

*asked on December 21, 2016* -
## Math

There were 20 at a round table at dinner, each of whom shook hands with the person on his or her immediate right and left.At the end of dinner, each person got up and shook hands with everybody except the people who sat to his or her immediate right or

*asked on December 13, 2016* -
## 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!!

*asked on August 20, 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

*asked on April 1, 2015* -
## chemistry

hello this is ellie again. I need help on this one problem A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of

*asked on December 3, 2013* -
## chemistry

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?

*asked on December 3, 2013* -
## chemistry

A solution of 0.314M KOH is used to neutralize 10.0mL H3PO4 solution. H3PO4(aq) + 3KOH(aq) → K3PO4(aq) + 3H2O(l) If 29.3mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution?

*asked on December 3, 2013* -
## Statistics

I am having a really rough time figuring out how this expected value was found in this Chi Square problem. 272 flies had long normal wings 60 flies had dumpy wings I know it's going to be a 3:1 ratio, and I know that 272 and 60 are my observed variables.

*asked on February 9, 2017* -
## Math- HELP!

If a population of fruit flies doubles every 3 days. What is k, the proportionality constant? How would I solve this problem? What would initial value be?? Thanks!

*asked on November 12, 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

*asked on May 18, 2016* -
## 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

*asked on October 12, 2014* -
## CORE MATHS

The first two terms in the expansion of (1+ax/2)^10 + (1+bx)^10 in ascending powers of x., are 2 and 90x^2 Given that a is less than b find the values of the constants a and b . (11 marks) Thanks :)

*asked on March 20, 2014* -
## English

Hello, what is a common theme between the Shakespeare's Romeo and Juliet, To Kill a Mockingbird, and Roahl Dahl's Lamb to the Slaughter? Please give examples of the the theme found within in the 3 books. It's just that I have to write a formal literary

*asked on December 10, 2013* -
## chemistry

Complete the following fission reaction 1n0 + 235U92 → 131Sn50 + ? + 2 1n0 + energy

*asked on December 6, 2013* -
## Math

during a match, pat kicks a football onto the roof of the stand. The stand and the path of the ball are at righ angles to each other. The path of the ball is given by y=2.5x-x^2÷15 The roof of the stand is given by y=x÷2+48 ÷5, where 18

*asked on November 13, 2012* -
## Math

on july 16, 1882, a massive thunderstorm over Dubuque, Iowa, produced huge hailstones. The diameter of some of the hailstones was 17 in. ICe weighs about 0.033 lb/in^3;. Whas is the approximate weightof a 17 in. hailstone?

*asked on January 13, 2011* -
## Math

Jack is standing next to a monument in the city square. His shadow is 18 feet long. The shadow of the monument is 150 feet long. If Jack is 6 feet tall, how tall is the monument

*asked on August 20, 2010* -
## chemistry

a 47.7L sample of a gaseous hydrocarbon, measured at 1.00atm and 25degreesC is burned in excess oxygen, liberating 4.33X10^3 kJ of heat at a constant pressure. what is the identity of the hydrocarbon?

*asked on June 21, 2010* -
## Chemistry

what is the net ionic equation for NaOH + H2SeO3?

*asked on June 19, 2010* -
## Ap Physics

Read the activity 2-1:Force and Pressure in the lab manual (pages 167-168). As described in the manual, consider a 10 cc syringe is connected to a 50 cc syringe. Information of the syringes are as follows: (mass of 10 cc piston) = 16 g (mass of 50 cc

*asked on November 12, 2009*