# Posts by AMANDA

Total # Posts: 2,545

**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) ?

**Math**

Nevermind, I understand!

**Math**

i'm not sure what you mean by up 10 and over thirty?

**Math**

Two poles are 20 feet tall and 30 feet tall, respectively. If they are 30 feet apart, how far is it from the top of one pole to the top of the other pole? Round your answer to the nearest tenth of a foot.

**College Physics**

A very long wire carries an I1 = 7.80 A current along the x axis and another long wire carries an I2 = 5.13 A current along the y axis. (I2 is directed upward on the y axis, and I1 is directed to the right on the x axis) What is the magnetic field at point P located at x = 4....

**Chemistry - check answers**

Can someone please check my answers and make sure they're correct? A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J B) How many joules are released when ...

**Physic**

A large rock with a mass of 38.2 kg is rolling at a speed of 4.8 m/s. How much power is needed to stop the rock in 7.2 seconds?

**Personal Dimensions of Education**

are

**Physics**

arcsin(.178/1.19)=8.603

**Physics**

Whats the diameter of the sphere?

**Physics**

In a laboratory experiment, one end of a horizontal string is tied to a support while the other end passes over a frictionless pulley and is tied to a 2.6kg sphere. Students determine the frequencies of standing waves on the horizontal segment of the string, then they raise a ...

**Chemistry**

Got it, thanks!

**Chemistry**

Exactly 1.0 mole of oxygen and 7.0 moles of nitrogen gas are in a container. The total gas pressure is 5.7 atm. What is the partial pressure of nitrogen in atm? I'm not sure how to go about setting up the problem. Any help is appreciated!

**Data apps and healthcare statistics**

what are the categories of information systems, examples of each and their roles in the healthcare delivery

**Chemistry**

I wanted to make sure I knew the correct states. Thanks a lot for your help!

**Chemistry**

Write the chemical formula and number of ions formed when the following electrolyte dissolves in water. Make sure to include appropriate states. K3PO4 = ??? Any help with this is greatly appreciated!

**Science**

d,b,b,c,a these are the answers to that quick check i just took it and got 100% :)

**LA**

1.)1 2.)3 3.)2 4.)1

**physics**

A beach ball, moving with a speed of +1.28 m/s rolls off a pier and hits the water a horizontal distance of 0.74 m from the end of the pier. How high (magnitude only) above the water is the pie?

**PHY**

It is said that unlike charges attract. You should have observed that after the sticky side of a piece of scotch tape is pulled quickly off the smooth side of another piece of tape the tapes attract each other. Perhaps each tape has the same type of charge and the rule has ...

**ap chemistry**

a 0.76 mol sample of pcl5 is placed in a 500 ml reaction vessel. what is the concentration of pcl5 when the reaction pcl5(g) ⇀↽ pcl3(g) + cl2(g) has reached equilibrium at 250◦c (when kc = 1.8)

**AP Chem**

Predict whether the equilibria I) CO(g) + H2O(g) ⇀↽ CO2(g) + H2(g), ∆H ◦ = −41 kJ II) X2(g) ⇀↽ 2 X(g), where X is a halogen will shift toward products or reactants with a temperature increase.

**CERT IV in allied health**

Yes, what change could one suggest?

**CERT IV in allied health**

Make one suggestin to change workpractice in allied health facility How would you encourage team members to have positive attitude to the change you are suggesting?

**SAT**

Get you English up to the mark first before you attempt any tests.

**English**

chicken's

**Data Management**

Expectation is that you'll be left with 0.8 cents, use a proability distribution chart to help you.

**World History**

What is the connection between Czar Nicholas II, mobilization, and WWI?

**Algebra 2**

Trying to help my daughter with her homework and im not sure how to do quadratic equations... Her question is X2(squared)+6=0 Im so lost!

**EARTH SCIENCE**

The answer is 1425 mL....because science is only measured using the metric system...

**Math**

"You have been asked to help build a rectangular play area at the new Tracy elementary school. You arrive at the site eager to begin! Much to your surprise, the only things available to work with are two pieces of rope. Explain how you can use the rope to find the ...

**statistics**

4. Are women getting taller? In one state, the average height of a woman aged 20 years or older is 63.7 inches in 1990. A random sample of 100 women is taken to test if women’s mean height today is different from 1990. The mean height of the 100 surveyed women is 63.9 ...

**science**

Thanks, I also got them all right, your to kind and have a blessed day.

**algebra**

How would you solve this one 40x^5-56x^4+24x^3 divided by -8x^2