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Posts by jonathan

Total # Posts: 419

Maths
A woman is seven times as old as her son. In five years time, she will be five times as old as him. How old are they now?

Chemistry
C (s) + S2 (g) = CS2 (g) . Kp=5.6 At equilibrium, P cs2 = 0.152 atm. Find P s2 How would I start this problem?

Chemistry
The information provided in the bracket above.

Chemistry
Calculate the tota bond energy of ethanol from this info:(C_C=347,C_H=414,H_O=464,C_O=360)kJmol-1.Thanks for responding

biochemistry
Yeah.(H+) (OH-)=1x10"-14.(H+)(0.2)=10"-14.H+=10'-14/2x10"-1=0.5x10"-14-(-1)=0.5x10"-13 or 5.0x10"-14.

Chemistry
M=1.1kg,C=0.385,change in temp=50-27.5=22.5C.Q=1.1x0.385x22.5=?KJ

english
2 and 3 is not wrong

science
I don't understand your question.

Science
Molecular mass= density X 2 = 1.56X2=?

Physics
Q=MxCxchange in temp=0.8x4.2x100=336KJ.

Chemistry
For water to to boil,ice to melt and for temperature to increase from 35C to 45C,it means heat is absorbed(endothermic).

Chemistry
b.The liquid water freezes because heat is given off from it(exothermic) to form ice unlike other options.

Chemistry
5Cm3 Of SO3 will be formed by 2.5Cm3 O2.

Chemistry
Of O2

Chemistry
2SO2+O2=>2SO3 From the equ,1Cm3 of O2 formed 2Cm3 of 2SO3.Therefore, 5Cm3 will be formed by 5 X 1/2=2.5Cm3 of SO3.

Biology
i'm not talking about location but functions and actions.

Biology
Why?

Biology
Is medulla oblongata responsible for peristalsis?

Physics
Thanks.

Physics
Two perpendicular forces have a resultant of 13N.if one of the forces is 5N, the other force is?

Biology
yeah.

Biology
Thanks a bunch!

Biology
Phylum in the animal kingdom rather.

Biology
What's the largest and most successful kingdom in the animal kingdom?

Chemistry
What's the resulting solution if 2000cm3 of 1MH2S04 is mixed with 20cm3 of 1M NaOH? i got 0.5M,acidic in concentration.

Science
I mean what is can the name of this enhancer be?

Science
When a silvery powdery substance was added to boiling beans,the beans get cooked quicker than normal. what may this be?

Chemistry
The relationship between velocity(U) of a gas molecules and their relative molecular mass(RAM) is?

Chemistry
28.11 i got this but 29 is the answer in my text.

Chemistry
what is the relative atomic mass of a silicon containing ore with 92% 28'Si,5%29'Si and 3%30'Si?

math
7.55 rather

math
75.55.

Chem
Actual mass=47.623-46.719=0.904g. mass of CaCo3(Ca=40,C=12,O=16X3=48.40+12+48)=100g %=100/1.631X100

social studies
ways in which individuals can apply the concept of independence and self-reliance in their lives.

math
1/8X 20=2.5.therefore each dose contains 2.5ml

maths
express log9 in terms of log3 x and log3 y and solve for x and y simultaneously

Math
A spinner is divided into 8 equal sections. Each section is numbered 1-8. Find each probability for one spin.

Chemistry
It's molecular mass is 2.The compound is H2O2.

value
A Biased Coin Is Such That The Head Is 4 Times More Likely To Show Up Than The Tail.What Is The Probability Of Obtaining A Head?

Calculus
A particle moves along the x-axis so that at any time t, measured in seconds, its position is given by s(t) = 5cos(t) ? sin(3t), measured in feet. What is the acceleration of the particle at time t = ? seconds?

Calculus
The position of a particle on the x-axis at time t, t > 0, is s(t) = ln(t) with t measured in seconds and s(t) measured in feet. What is the average velocity of the particle for 1 ? t ? e? a)1 b)e c)e-1 d)1/(e-1)

Calculus
The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 60t ? 1.5t^2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop? a)60 sec b)40 sec c)20 sec d...

Calculus
A particle moves with velocity function v(t) = 2t^2 ? 3t ? 3, with v measured in feet per second and t measured in seconds. Find the acceleration of the particle at time t = 2 seconds. a)3/4 feet per second^2 b)-1 feet per second^2 c)32 feet per second^2 d)5 feet per second^2

Calculus
A particle is moving along the x-axis so that its position at t ? 0 is given by s(t)=(t)In(2t). Find the acceleration of the particle when the velocity is first zero. a)2e^2 b)2e c)e d)None of these Any help is greatly appreciated

Math
Jean has $280 in her savings account starting next week she will deposit $30 in her account every week is the amount of money in her account proportional to the number of weeks. Thank you for helping

English Check
You would say for me. So it should be you and me since its in the objective form!

English Check
So my original answer is correct You and I

English Check
But "I" is the subject and you is the object.

English Check
The advice was meant for ____ A)you and i B)she and i C) you and me Hello i need help. My original answer was A)you and I. But then I started reading a book on English grammar and it says it should be C)she and I since they are subject pronouns.

10th Grade Math
A history class is comprised of 6 female and 9 male students. If the instructor of the class randomly chooses 5 students from the class for an oral exam, what is the probability that 2 female students and 3 male students will be selected? Round your answer to 3 decimal places...

pre calc
5x+3yi=5-6i?

Math
Thanks you! I got the answer!

Math
Two trains leave the station at the same time, one heading east and the other west. The eastbound train travels 12 miles per hour slower than the westbound train. If the two trains are 400 miles apart after 2 hours, what is the rate of the eastbound train? No Rounding.

math
If 35% of people surveyed prefer orange to apples.Out of 475 people surveyed how many can be predicted to prefer orange

World History
It is ture

english
It A

Geometry
Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

chemistry
what volume of glycerine C3H8O3, with a density of 1.26 g/mL should be taken to obtain 2.50 ml of glycerine?

Math
Larry hit 24 home runs last season and 50 this season. What is the percent of increase in the number of home runs Larry hit from last season to this season?

U.S History
Don't You Push Me Down Words and Music by Woody Guthrie Well you can play with me And you can hold my hand. We can skip together Down to the Pretzel man You can wear my mommy's shoes Put on my daddy's hat You can even laugh at me But don't you push me down. ...

physics
calculate the electrostatic force between charges of -2.4 µC and +5.3 µC, placed 58cm apart in a vaccum.

physics
An artificial Earth satellite, of mass 3.00 × 10^3 kg, has an elliptical orbit, with a mean altitude of 500 km. (a) What is its mean value of gravitational potential energy while in orbit? (b) What is its mean value of orbital kinetic energy? (c) What is its total energy...

maths
determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s

maths
4x+16y:32 and 4x+y:17

physics
A capacitor,consisting of two metal plates each of area 50cm2 and space 0.2mm apart in air ,is connected across a 120V supply.Calculate (1)the energy stored..(2)the electric flux density and the potential gradient..

Geometry
A photographer enlarged a picture. If the width of the image is 5 inches and the width of the pre-image was x, what is the scale factor for the dilation in terms of x?

gale math
How to write 233.75 and 85.50 as a decimal number

math
a)without using a spreadsheet, construct an amortization table for the loan repayment b)what is the final payment if she takes all of the four years to repay the loan c)what is the last payment if she chooses to repay the loan in seven payments

math
meredith borrows $3600 to help pay for nurse's college. she will repay the loan by making equal blended payment of $625 each at the end of every six months. The interest rate is 11%/a, compounded semi annually.

Math
If 500 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed? Answer to two decimal places.

Ap physics 1
The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each mass ...

Chemistry
what is the wave length and type of light released when an electron absorbs 3.03 x10 -19 j of energy

vocab (english)
I have improving Vocabulary skills 4th edition and I need chapter 1 sentence check 2 answers

Science
The spin of an object on its own axis is called

English
Yeah.it's a must you put 'the'

physical science(elecrostatics)
A(-9x10^-9 C) 20mm B(5x10^-9 C) (a)calculate the force between the charges (b)if A comes in contact with B Calculate the new charge on A and B

English
bravery

algebra 1
One staple is probably to light to pick up on the balance. Let m = mass of one staple. 210*m = 6.8 m = 6.8/210 m = 0.032g

Physics
At an instant the block(M = 33kg) is moving down the slope. Angle between slope and floor = 33deg Force Pulling up the slope 49N at 38deg to the slope What is the acceleration of the block up the slope if the kinetic coefficient of friction is 0.5? My first thought was that ...

life orientation
Define risk behavior and explain why it is important for teenagers to investigate and be knowledgeable about it.

Math
Show that the limit as h approaches 0 of (e^h-1 ) all over h = ln e = 1 using at least two numerical examples.

Calculus
Show that the limit as h approaches 0 of (e^h-1 ) all over h = ln e = 1 using at least two numerical examples.

cal
Show that the limit as h approaches 0 of (e^h-1 ) all over h = ln e = 1 using at least two numerical examples.

Calculus
Find the derivative of the following functions using the f prime of x = the limit as h approaches 0 of f(x+h) – f(x) all over h a)ƒ(x) = x2 + 5^x b)ƒ(x)= 1/2^x

Calculus
Givenƒ(x) = ex, verify that lim h->0 (e^x+h - e^h)/h + e^x and explain how this illustrates that ƒ′(x) = ln e • ƒ(x) = ƒ(x)

biology help
What are the biological terms of the following 1.A diagram that show the evolutionary history of plant groups 2.hoploid cell which grows into a plant

physical science chemistry
If 25 cm^3 of the potassium hydroxide (KOH) solution was used to neutralise 35cm^3 hydrochloric (HCl)solution, determine the concentration of the hydrochloric acid solution. Thanks

science
1. Descriptive statistics are widely used in qualitative research. When establishing if a population is normally distributed explain when the statistics of sample size, mean, mode, median, skewness and kurtosis will guide the researcher to make conclusions of a normal ...

Life orietation.
The powers of the police during a protest.

English
english is the language of opportunity

maths
PLEASE DO NOT POST PROBLEMS FROM THE PROMYS APPLICATION SET. YOU HAVE BEEN REPORTED.

Chemistry
What is the change in entropy when 9.30 mL of liquid benzene (C6H6, d = 0.879 g/mL) is burned in the presence of 37.2 L of oxygen gas, measured at 298 K and 1 atm pressure? 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(l); ∆S° = –437.7 J/K at 298 K

Help please
WTF is with all these haters ? Like you enjoy doing your fckn schoolwork, I know how to do them, I'm just lazy . gtfoh john & writeacher

chemistry
Determine the limiting reactant for this reaction if 3.027 grams of Aluminum are reacted with 60.00 mL of a solution that is 6 M KOH. Determine the amount of KAl(SO4)2•12 H2O that can be produced from this reaction. Molar mass Alum = 474 g/mol 2 Al (s) + 2 KOH (aq) + 22 ...

Probability
Consider 10 independent tosses of a biased coin with the probability of Heads at each toss equal to p, where 0<p<1. Given that there were 4 Heads in the first 7 tosses, find the probability that the 2nd Heads occurred at the 4th toss. Give a numerical answer.

math
Michaela makes original stationary to give away as gifts. She likes to put a small bow in the corner of each card. She purchased a piece of ribbon that was 3 1/4 ft long. She can make each bow out of 1/3 ft of ribbon. Which equation would be used to show how many bows she can ...

Math
a pool 5 feet deep with a diameter of 40 feet is filled with water in 50 minutes. how long will it take to fill a pool that is 6 feet deep with a diameter of 36 feet?

physics
0.160kg

Calculus
A 13 foot ladder is leaning against the house when it's base starts to slide away. By the time is 12 feet from the house the base is moving at the rate of 5 ft/sec. 1.How fast is the top of the ladder sliding down the wall at that moment? 2. At what rate is the angle theta...

algebra 2
This is a repost from earlier. I thought it didn't go through so I typed it again.

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