# Posts by Jonathan

Total # Posts: 421

**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...

**Maths,Physics,life science,geography,**

Another approach for question #2 (aside from Damon's answer) is to find the final velocity of the plane from the given 800 meters landing strip, that is, if the positive and not equal to zero, then it cannot safely land that small airport. So, Vi= 100m/s a= -5 m/s^2 x= 800...