# Posts by AMANDA

Total # Posts: 2,583

**Chemistry**

Moles of Copper in the original .825g of Copper Oxide

**program planning**

Information provided by a parent on an enrollment form can be shared with unauthorized persons only if _______ gives written consent.

**child day care**

child day care facilities and staff question and answer

**physics**

A 2.27 kg ball is attached to a ceiling by a 1.26 m long string. The height of the room is 2.57 m. What is the gravitational potential energy of the ball relative to the ceiling?

**Math**

What is the linear approximation of the square root of 8.9? Must be accurate to the fifth decimal place. I have tried entering 2.98328 and 2.98328 but that does not appear to be correct. Please help!!

**Math**

What is the linear approximation of the square root of 8.9? Must be accurate to the fifth decimal place. I have tried entering 2.98328 but that does not appear to be correct.

**9th grade algebra**

An Electrician Charges $120 After 2 Hours Of Work And $190 After 4 Hours Of Work. Write A Linear Model That Represents The Total Cost.

**programming**

Write a MATLAB program to create and output the touch-tone telephone signals (Dual-Tone, Multi-Frequency, DTMF) for the input numbers 0 through 9 (disregard the * and # symbols). When a user presses a button on a telephone set, a signal is produced that is the sum of two ...

**Chemistry**

a piece of silver contains 6.42x10^22 how many dozens does it contain

**Technology in Day Care **

C is wrong I tried it already

**Technology in Day Care **

Which of the following is not a reason why an early childhood teacher would choose to use a virtual field trip over live, hands-on experience? A. The actual trip would be too expensive. B. The location is too far away. C. It wouldn't be safe to ...

**English**

What is the principle behind all social notes? wanting to be given more, or to be invited back again sincere appreciation for the kindness

**English**

Typing an informal letter is acceptable, but a typed letter is considered more formal than a handwritten one. True False

**Science! Help!!**

@chastyn i am in connections and im also 13 but i live in south carolina. how id u get a bf...lol and which is the right answer though

**Chemistry**

Three isotopes of Argon occur naturally: 36Ar (mass = 35.9675 amu) 38Ar (mass = 37.9627 amu) 40Ar (mass = 39.9624 amu) If the percent abundance of 36Ar is 0.3400, what is the percent abundance of 40Ar?

**english**

Thanks for the answers very helpful

**GEM Math**

7 rows of 8 and 12 rows of 8

**Physics**

A curve in a road 8m wide has a radius of 60 m. How much higher than its inner edge should be the other edge of the road be if it is to be bunked properly at 20 km/hr?

**child development part 2**

When preparing an environment for school - aged children, the caregiver should ensure that the

**Physical Science**

you should end up with an answer close to 2400cm3

**algebra I**

A water balloon is dropped from a rooftop that is 40 feet tall. How long will it take to fall to the ground? Round to the nearest tenth and include units.

**Question?**

Sue I think that do to it takes a man or woman to produce stereo type talk

**Question?**

do you think gender roles are produced by gender stereotypes, or vice versa? I personally feel that gender roles produce gender stereotypes . What do you think

**psychology (check answer)**

Adolescent women are most likely to use contraception: a. During their first experience of sexual intercourse. My answers is A b. If they already have one baby. c. If they have been involved in a steady relationship. d. If they have just met their sexual partners.

**Human Sexuality**

Diseases most frequently found to have adverse effects on sexual functioning include all of the following EXCEPT: a. Multiple sclerosis or stroke. b. Diabetes, cardiovascular disease, and heart attacks. c. Arthritis. d. Asthma.

**math**

n=8, p=.80, q=1-.80=0.20, x=6 P(x)=nCxPxQn-x P(x)=8C6(0.80)6(0.20)2 = (28)x(0.262144)x(0.04) =0.294

**Math**

Two boats are approaching the same dock. Boat A measures 37° from boat B to the dock. Boat B measures 68° from boat A to the dock. What is the angle the boats make with the dock?

**Chemistry**

1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said to be _______. 3. A ...

**Chemistry**

No.

**Chemistry**

1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said to be _______. 3. A ...

**algebra**

7-|m-1|=3

**Traditional african marriage is an advantage for men only,women**

Its sad coz we as woman's are takes for advantage

**speech**

Speech

**speech**

Ntathakusa english

**math**

A plumber charges a flat $50 for a home service call plus $10 per 15 minutes of labour. Write an equation for calculating the total charges, C, in terms of the hours of labour, H. If you were to plot a graph of C vs. H, what would be the slope and C-intercept of the line?

**Chemistry**

Just two more to check, thanks! 1) The pH of a 1.25 M solution of unknown monoprotic acid is 5.43. Determine the value of Ka for this acid. HX <--> H+ + X-. (I obtain 1.0 x 10^-11) 2) Calculate the pH of a solution which is 0.73 M benzoic acid. Ka = 6.5 x 10-5, HC7H5O2 &...

**Chemistry**

Right. I typed it correctly, so it's definitely a typo on the worksheet. Thanks for pointing that out. I used 4.4 x 10^-4 for Kb, per my textbook. Thanks for checking!

**Chemistry**

1) Which ion(s) below would undergo hydrolysis in water? A) Cl- B) K+ C) NH4+ D) NO3- E) Two of the above My guess is C, but I'm not too sure about this one. 2) Calculate the [OH-] present in solution labeled 1.73 M methylamine. CH3NH3 + H2O --> CH3NH3+ + OH-. I get 2....

**Physics- HELP PLEASE:)**

I've tried: #4.) ¢V=IR convert to I=¢V/Rseries Rseries= R1 + R2+ R3 which is 2+2+2=6. then I took I=9V divided by6. so I=1.5V....( get 3 tries on online homework, it said 1.5 isn't right, and im not sure what I had done wrong.) #5.) I did 1/...

**Physics- HELP PLEASE:)**

4.) Three 20-Ù resistors are connected in series to a 9-V battery. What is the voltage difference across each resistor? 5.) Three resistors of 5 Ù, 10 Ù, and 2 Ù are connected in parallel with one another. What is the equivalent resistance of this ...

**Chemistry - check answers**

1) Which of the following sets is arranged according to increasing base strength? A) F-, OH-, Cl- B) F-, Cl-, OH- C) OH-, F-, Cl- D) OH-, Cl-, F- E) Cl-, F-, OH- (my answer) 2) What is the pH of a solution formed by adding 4.3 x 10^-5 moles of KOH in 1 L of water? A) 4.3 x 10...

**Chemistry**

1) In the reaction NaOH + H2O --> Na+ + OH-, sodium hydroxide is the: A) Lewis acid B) Brønsted-Lowry acid C) Arrhenius base D) Amphoteric substance E) None of the above (I think it's C) 2) The conjugate acid of the sulfide ion is: A) S^2- B) HS- C) H2S D) H3S+ E...

**physics**

so E=v/d E=.03/3 E=.01?

**physics**

The electric potential increases from 10 V to 70 V from the bottom plate to the top plate of a parallel-plate capacitor. We are going to move a charge of +5 x 10-4 C from the bottom plate to the top plate. What is the magnitude of the change in potential energy of this charge...

**physics**

so... E=.03J/3m=0.01J/m??

**physics**

In the previous problem (Question 4), if the distance between the two plates of the capacitor is 3 cm, what is the magnitude of the uniform electric field between the two plates?

**physics**

The electric potential increases from 10 V to 70 V from the bottom plate to the top plate of a parallel-plate capacitor. We are going to move a charge of +5 x 10-4 C from the bottom plate to the top plate. What is the magnitude of the change in potential energy of this charge...

**physics**

0.15j-0.05j=0.1 0.1=__*2x10^-6c 0.1/2x10^-6c=___ 50000=__ so answer 50000j/c?

**physics**

The potential energy of a +2 x 10-6 C charge decreases from 0.15 J to 0.05 J when it is moved from point A to point B. What is the change in electric potential between these two points? Do not enter any (-) sign in your answer.

**physics**

9v*4c=36J??

**physics**

A total charge of +4 C flows from the +9 V positive terminal of a battery to the negative terminal at 0 V. What is the change in potential energy of the charge?

**physics**

thank you. my professor gave us a change in GPE=mgh and a E=Fe/q equations and was confused

**physics**

30J*?

**physics**

45J, correct?

**physics**

how do you figure out change in V? is it 10v- 70v? then times it by .5c and get the change in PE??

**physics**

so ... change in PE=.5 times 10v? sorry my professor didn't cover what C or V equations are

**physics**

A charge of +0.5 C is moved from a position where the electric potential is 10 V to a position where the electric potential is 70 V. What is the the change in potential energy of the charge associated with this change in position?

**algebra**

Suppose that a box has a base with a width of x, a length of x+3, and a height of 1 inch. It is cut from a square sheet of material with an area of 130 in2. Find the dimensions of the box.

**Chemistry**

The equilibrium constant is 16 for the gas phase reaction SO2 + NO2 <--> SO3 + NO at a certain temperature. If 3.0 moles each of SO2 and NO2 are placed together in an empty 1.0 liter flask and the system is allowed to come to equilibrium at this temperature, what will be...

**Chemistry - check answer**

Great, thanks!

**Chemistry - check answer**

A 20.0 L reaction vessel contains 0.016 moles CO2, 1.05 moles of CO, and 2.00 moles of C. The mixture is approaching the following equilibrium: CO2(g) + C(s) <--> 2CO(g) a) Calculate the reaction quotient Q. b) If value of K is 1.17, predict which direction the reaction ...

**Chemistry**

A flask was immersed in 350 g of water at 25 degrees C. Steam at 100 degrees C was passed into this flask, and eventually condensed into water at 100 degrees C. If the temperature of the water surrounding the flask was raised to 70 degrees C, how many grams of steam must have ...

**Stats Class**

Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rate by subway riders are uniformly distributed between 5 and 50 ...

**Physics**

What is the critical angle (in degrees) for a ray of light coming from a medium with an index of refraction of 1.4 to a medium with an index of refraction of 1.2? label the unit.

**Physics**

A fish swimming in a pond looks up at a dragonfly flying 45 cm above the surface of the water. How far does the dragonfly appear to the fish if the indices of refraction of water and air are 1.33 and 1, respectively? Enter your answer in cm.

**history**

So what's the answer ?

**physics**

A string with a length of 1.3 m is fixed at both ends. What is the longest possible wavelength for a standing wave on this string?

**Global Studies**

I DIDN'T KNOW TEACHERS CUSSED OMG but yea guys rainbow is right 100% thanks

**Chemistry**

How many milliliters of 0.242 M NaOH are required to exactly titrate 18.0 grams of H2C2O4?

**Physics**

A wave can be propagated on a rope by holding one end of the rope and moving your hand up and down. The resulting wave is: A)neither transverse nor longitudinal. B)both transverse and longitudinal C)longitudinal D)transverse

**Physics**

A railroad car with a mass of 12000 kg collides and couples with a second car of mass 18000 kg that is initially at rest. The first car is moving with a speed of 9 m/s before collision. If external forces can be ignored, what is the final speed of the two railroad cars after ...

**Physics**

A 5-kg ball is at rest when it is struck head-on by a 2-kg ball moving along a track at 10 m/s. If the 2-kg ball is at rest after the collision, what is the speed of the 5-kg ball after the collision?

**Calc Help :(((((**

find the derivative of: (1/3)^(x^2) i got ln(1/3)*(1/3)^(x^2)*(2x) but the answer is supposed to be the negative of that.. where does the negative come in?

**Chemistry - check answers**

Got it. Thanks a lot!

**Chemistry - check answers**

Would D) be correct for 3?

**Chemistry - check answers**

1) Which element has the largest first ionization energy? A) Rb, B) Fr, C) K, D) Na, E) Mg Answer: E 2) Which has the highest electronegativity? A) Na, B) Cs, C) Si, D) Te, E) Cl Answer: E 3) In which of the following are the bonds arranged in order of increasing polarity? A) ...

**english**

Choose the sentence that has a subject complement. A. The day ended with many surprises. B. I felt much better. C. The nurse felt my pulse. D. We can't leave without seeing I think it's B.

**CHEMISTRY**

I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...

**Calc Help :(((((**

is the square root in parenthesis within the ln? on one side it is and on the other its not

**math 1 question pls help!!!!!**

All of your answers are totally wrong!

**math 1 question pls help!!!!!**

All of your answers arw to play wrong!

**math 1 question pls help!!!!!**

ok so i think i get it, volume is width*length*depth so dividing the known volume by its width gives you the length*depth. after that set up a porportion: (L*W)of known/92 = x/46 solve for x gives you the length*depth of the unknown volume, times that but the 46 width.. i got ...

**CHEMISTRY**

I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...

**Chemistry**

I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...

**Rate Law - Chemistry**

I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...

**Chemistry**

I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...

**English??**

I am writing a recommendation paper on the type of medication to treat ADD/ADHD.. does anyone have an interesting idea for a title?? maybe something joke-ish? i cant think of anything and my teacher said it has to be something to 'draw the audience in'

**Chemistry**

these are (p*v)/t problems p=pressure v=volume t=temperature (in kelvin) it doesnt mention pressures in these problems so we assume it remains constant. the problems should be set up as: (Volume of initial)/(temp. of initial) = (volume of final)/(temp. of final) plug in and ...

**Maths,Tourism, science, Economics**

For three courses can able to do after grade 12

**Chemistry**

A 247 lb fullback runs the 40 yd dash at a speed of 17.09 ± 0.1 mi/h. (a) What is his de Broglie wavelength (in meters)? (b) What is the uncertainty in his position? ** I found part A but I am unsure how to use this information to get part B. Any help is appreciated :)

**Physics**

A truck and a bicycle are moving side by side with the same velocity. Which, if either, will require the larger impulse to bring it to a stop? a) The bicycle. b) The truck. c) Both will need the same impulse. d) There is not enough information to determine the answer.

**Physics**

The frequency of oscillation of a pendulum is 7 Hz. What is the period of oscillation?

**Physics**

A ball traveling with an initial momentum of 2.5 kg*m/s bounces off a wall and comes back in the opposite direction with a momentum of -2.5 kg*m/s. What impulse would be required to produce this change?

**Pre-Algebra**

Helping hand is correct 100%

**Global Studies (Please help)**

im behind in my social studies and i would like to give a special thanks to eveyone here for helping, to any more future people the answers are infat a, d, a but you already know that, so ill be going i guess :)

**physics**

1. A ship has a top speed of 3.0 m/s in calm water. The current of the ocean tends to push the boat at 2.0 m/s on a bearing of due South. What will be the net velocity of the ship if the captain points his ship on a bearing of 55 North or West and applies full power?

**Science- Check Please :)**

Ok so #1 is correct but.... 2 and 3 are incorrect in my opinon. Photosynthesis produces glucose and oxygen which are the starting materials for cellular respiration and cellular respiration produces carbon dioxide and water, the starting materials used in photosynthesis. for #...

**math**

how do you do this problem h=2A/b1+b2 solve for b1

**English**

I m doing an analysis question on a poem called Question by May Swenson. The question says: Describe the prosody of the poem and comment on the effect of the initial substitutions of the meter. I do not even know where to start with this question, if you could help me out please.

**Chemistry (Thermodynamics)**

Write a balanced equation for the complete combustion of 1 mole of ethyne gas (C2H2) ?