# Posts by amy

Total # Posts: 4,285

Physics question
mass 0.3kg is moving on the ground at speed 4m/s towards ball B which is at rest on the ground and has mass of 0.8kg. When A collides with B the ball remains in contact for 0.2 sec after the collision B moves forward with a velocity of 1.8m/s find the average force of A and B ...

Chemistry
Hi there, can someone please help me with this chemistry problem? Write the equation for the acid-base reaction that takes place when nitric acid (HNO3) dissolves in H2O. (Include the phase of each substance.) I got HNO3(aq) + H2O --> H3O+(aq) + NO3?(aq) but the answer is ...

Math

Math
An Anthropologist finds bones that her Instruments measure it as 0.921% of the amount of carbon- 14 the bones would have contained when the person was alive. How long ago did the person die? The half life, t 1/2, carbon 14 is 5,730 years. Round To the nearest thousands

Math
The Mendes family bought a new house 10 years ago for \$101,000. The house is now worth \$160,000. Assuming a steady rate of growth, what was the yearly rate of appreciation ?

Math
Pedro and Ivan raced each other in a 24-mile bike race. After 2o minutes, Pedro traveled 5 miles. Ivan had spent the 20 minutes travelling at a rate of 16 miles per hour. Which person was in first place after 20 minutes? Use words and/or numbers to show how you determined your...

Math
Donald Trump purchased a large box of his own books for \$55,000. He gave 25 of the books to other republican nominees and then sold the rest on an Internet website for \$63,000, making a profit of \$15 on each one. a) How many his books were in the box? b) What was the original ...

Math
Nevermind I understand now, thank you!

Math
For a wouldn't the equation be -1(x^2 + 18x + 20) ??

Math
Brock Obama, Justin Trudeau and Jinping Xi decide to help Mr Blakely bathe his super cat Mike Wazowski. Brock can bathe Mike Wazowski in x minutes, Justin can bathe it in 2 minutes less than Brock, and Jinping can bathe it in 2 minutes more than Brock. When Brock and Justin ...

Math
A game has 30 cards numbered 1 through 30. e cards are shu ed. one card is picked at random. Find each probability. Which cards would give a probability of 1/10 they were picked.

math
3 times a number is greater than half of the number by 50. What is the number?

Genetics
Describe how chromosomes are cultured and prepared for laboratory analysis?

Science
Difference between prokaryotes and eukaryotes

Genetics
Describe how chromosomes are cultured and prepared for laboratory analysis?

Science
Explain water potential and how it affects osmosis?

Genetics
Explain the chromosomal differences between males and females?

Physics
Got it, thank you very much.

Physics
sorry 13.05^2

Physics
(13.05*sin(48)*2)/9.8=1.97 Is this correct?

Physics
Thank you!

Physics
A football player kicks a field goal, launchingthe ball at an angle of 48" above the horizontal. During the kick, the ball is in contact with the player's foot for 0.045 s, and the ball's acceleration is 290 m/sz. Vvhat is the range of the football?

history
In what way does Saudi Arabia play an important role in foreign and security aspects in the Middle East

Social Studies
Why is the legacy of colonial powers a barrier to democracy in the Middle East?

science
Goose grass grows tightly around other plants such as hawthorn bushes. suggest two reasons why this method of growth is an advantage for the goose grass.

PreCalculus
Let f(x) = x^2 +3x - 1 and g(x) = x^3 +4x^2 +1. Find (f-g)(x) a. (f-g)(x)=-x^3 - 3x^2 +3x b. (f-g)(x)=x^3 - 3x^2 +3x - 2 c. (f-g)(x)=--x^3 - 3x^2 +3x - 2 d. (f-g)(x)=-x^3 - 7x^2 +3x - 2

Lab Math
A stock solution of inulin has a concentration of 500mg/ml. From this stock 0.50ml is diluted with 0.50ml of sterile saline. After 30 min blood is sampled and produces a result of 50ug/ml. What is total extravascular volume?

Math
So I need help with 2 questions. This is what is being asked. Write the slope-intercept forms of the equations of the lines through the given point (a) parallel to the given line and (b) perpendicular to the given line. 1. (3, -2) x - y =0 2. (-4, 1) y + 2 = 0 Please Help and ...

Essay Writing
Thanks! And any suggestions on how to make an interesting intro?

Essay Writing
So I'm supposed to write an essay about promoting South East Asian Literature in general and I don't know how to make a good introduction and how to persuade people in general. Any tips/advice would be great. Thanks :)

math
A fruit seller sold 234 apples.He sold twice as many apples as mangoes.how many more apples did he sell?

Math
A bag of candy contains 11 peppermints, 8 chocolates,13 gumdrops, and 9 licorices. jack randomly takes a gumdrop from the bag and eats it. what is the probability that the next candy she takes will be a gumdrop or a peppermint?

Microbiology
How would you determine the minimum bactericidal concentration of a given microbial agent?

Science
Why is it important that scientists communicate with each other

English
Which passage would best reflect Gatsby personality and why ? From the book called Great Gatsby

chemistry
what is something that would lower the freezing point of water to -3.7 degrees c if one mole were placed in 1000 g of water? I don't understand how to do this question, I'd appreciate the help (: Thank you

Physics
A seagull drops a claim from a height of 40m above the rocks. If the air temperature is 0 degrees C, how long after the claim is dropped does the sound of it drinking the rocks directly below reach the seagull? Assume that the seagull hovered in place during the drop.. So what...

physics
What I did is v = distance / t 153 = d / 1.68 d = 257 m

physics
a destroyer sends out a sonar pulse that returns from a submarine in 1.68s. if the spped of sound in the sea of water is 1531m/s, how far away is the submarine I don't really understand what the question is asking. I appreciate your help! Thank you

college chemistry!!!
Calculate the pH of 500ml 0.07M nitrous acid solution to which 1.4015 grams of sodium nitrite (KW=68.9953) are added.

chemistry
What is a liquid that is known for its high viscosiy due to H bonds? (not water) I'm not sure how to find this, I feel like it should be easy to just google but I really can't find anything about it. I'd appreciate your help, thank you!

chemistry
Sorry for all the questions. So the equation I ended up with was: 101.325 x 0.067 / 95.97 = V2 But I'm assuming that's not right, so instead of x0.067 would it be x 273K?

chemistry
Thank you! (: I'm also confused about the 2nd question: Correct your dry hydrogen volume to a volume at STP (Assume the temperature of the hydrogen in your collection tube was the same as the air temperature).

chemistry
So the question I have is: Calculate the pressure of dry hydrogen collected. (Use the water temperature). And the evidence that we obtained was: Length of magnesium 3.8Cm Mass of 1 m of magnesium 1.254g Volume of hydrogen collected 67mL Air temperature 27C Water temperature ...

Social studies
3. D? 4. B?

Social studies
1. If a consumer makes monthly payments of \$250 to pay off a car loan, what type of credit is she using? (1 point) non­revolving revolving short term unsecured 2. Caitlin wants to buy an airline ticket, but she’s uncomfortable taking that much cash to the counter at ...

Math
Joe spent .55 of his money in one shop and 2/5 of it in another, he then had €6 left, how much had he at first?

chemistry HELP
a flask containing 50ml of 0.128M sodium acetate is titrated with 0.138M nitric acid. Calculate the initial ph of the acetate solution and calculate the ph after the addition of 24.9ml of nitric acid. pKa for acetate 4.757

physics HELP!!
A diffraction grating has 600 lines/mm. Light with a wavelenght of 600nm is incident on it. A screen is placed 0.1m from the grating. Calculate the distance from the 1st and 2nd order maxima on the screen

physics HELP!!
A capacitor is constructed from two aluminium plates 1.5cm on a side separated by 0.2mm of air. (A) Calculate the capacitance of the capacitor. (2 sig figures) (B)Calculate the voltage required to store 1nJ of energy in the capacitor.

Math
6 times the difference of a number and 9 is 18 less than the number. I need to write out as an equasion. Help!

physics (mirrors)
An object is placed from a concave mirror with a radius of curvature of 50cm. The object has a height of 5cm. a)Calculate the focal lenght of the mirror. b)Calculate the position of the image formed by the mirror. Is the image real or virtual? c)Calculate the size of the image...

physics
1. a) using heat exchange and conservation of thermal energy determine the specific latent heat of fusion for ice. b) determine the percentage error The data we determined was: Hot water: mass - 0.1kg initial temp-87C final temp - 56 C Melted ice: mass - 0.024 kg Initial temp...

Physics
Determine the percentage error. So we found that aluminium has a specific heat capacity of 18441J/KgC And I know that the percentage error = mv-av/av x 100% But how do we know the actual value of aluminium? My teacher never gave it to us. And when it says mv-av does it mean ...

Physics
Thank you for answering! So when I did the math I got 18,441 j/kg degree c However the actual value is supposed to be 900.did I do the math wrong or did I just do something wrong in the experiment? Thanks!

Physics
Using heat exchange and conservation of thermal energy, determine the specific heat capacity for your metal. So the data we have is: Aluminium: Mass - 0.004 Initial temp - 100C Final temp: 32C Water: Mass -0.1 Initial temp - 20C Final temp - 32C I know that the formula is mct...

chemistry
So we did an experiment where we mixed Cacl2 and NaCl and then found the mass of the precipitate. Then we compared it to reference data on a standard curve to see the mass of Na2Co3 reacting to produce the CaCo3. So what I'm stuck on is this: Suppose the precipitate formed...

algebra 2
how to find the value of sec theta -15/4 and Tan theta 12 when theta is greater than zero and less than 360

chemistry
lactic acid is the avid responsible for the sour test in spit milk. on the basis of combustion analysis, it's percentage composition by mass is 40.00% carbon, 6.71%hydrogen and x% oxygen. a. Calculate the empirical formula of lactic acid b. The molar mass of lactic acid is...

physics
Thank you!!

physics
How long would it take a 750W electric motor to do 1.5x10^5 of work What I have so far: So we know w=fappxd 1.5x10^5=750xd So we can arrange that to find d. And then maybe use a formula to find t? Thank you!!

Physics
Determine the amount of work required for each of the following: a) to lower a 35kg sack of rice through a height of 3.5m b) to carry the 30kg sack of rice 10m along a corridor c)to crave the sack of rice 15m along the corridor at a constant velocity against a frictional force...

Physics
Sorry I meant to write 200g

Physics
A 200h bag of potato chips contains 4.8MJ of energy. How long would it take you working at your maximum body power to consume this energy? So we did 2 trials where we ran up the stairs, and my final power for 1 was 246W and for the other it was 338W. So I assume you divide the...

Physics
Hello so my question is an 85kg kangaroo acquires 2.2kJ of energy in jumping straight up and down from rest. How high does the kangaroo jump? My solution: When he's at rest Eg=2200J but in air Eg=0 Eg=mhh 2200=85(9.8)h 2.64m=h Looking at it now it doesn't really make ...

math
3 fourth of a class are boys. The girls are 24 less than the boys. How many pupils are in the class?

Maths
Karan took a loan of rs 70000 from a bank. If the rate of interest is 10%per annum find difference in amount he would be paying after 1.5 year if the interest is compound annually and compound half yearly

Math
Thank u

Math
IS this correct? 1.90+.80+.80+.80=\$4.30

Math
Im not sure where to start

Math
A taxi service charges a \$1.90 fee for each ride plus an additional .80 per mile. If a taxi ride cost \$4.30, how many miles did the taxi travel travel during the ride?

Math
A rectangular garden has a length if 6.8 meters and seea perimeter of 20.6 meters. What is the width if the garden?

Math
Thanks Ms. Sue

Math
Lol... Sorry is this better? 3.75

Math
Is this correct? 49.8

Math
A carpenter cut pieces from a 12 foot long board that were 4 3/4 feet long and 3 1/2 feet long. What is the length of the remaining part if the board?

Math
Thank u

Math
Factor the following expression completely: 2ab+6a+12abc

Math
What does this mean >

Math
Ziggy earned \$7.50 per hour plus an additional \$100 in tips in Saturday. He earned more than \$145 in all. Write an inequality to show h, the amount of hours he may have worked on Saturday.

Math
Thanks

Math
Yes mam, 2 1/4 and they are all teaspoons and the other is 1 1/8

Math
A recipe calls for 2 1/4 of salt for every 1 1/8 teaspoon of black pepper. How many teaspoons of salt are needed for each teaspoon of pepper used?

Math
Still don't understand

Math
Rita's baby brother weighed 7 5/16 pounds when he was born. Since then, her brother has gained 3 3/4 pounds. How much does Rita's baby brother weigh now? Express your answer as a fraction and as a decimal.

Chemistry
Write the equations for the reactions in which acids and bases are neutralized by the buffer consisting of HCOOH and HCOONa is a water solution in order to maintain a relatively constant pH of the solution?

Math
Thanks so much Ms.Sue

Math
If a person walks 4/5 miles in each 1/10 hr. How fast is the person walking per hour?

Math
Thank u

Math
If a women currently makes \$20 per hour, but gets a 10% raise which represents 1/10 of her hourly wage, what will be her new hourly wage?

Math
Which way do I write it?

Math
350÷40=8.75

Math
Is this correct? 40* 8.75= \$350

Math
Amanda uses the equation y=kx to determine how much money she earns after working any number of hours (x). Amanda earned \$350 after working 40 hours. What is the value of k in Amanda's equation?

Math
Thank u Ms. Sue

Math
14=560÷40 Is this correct?

Math
The amount of money Jeff earns varies directly with the number if hours he works. Jeff worked 40 hours and earned \$560. What is the constant of variation (in other words, what is Jeff's hourly wage) for Jeff's earnings?

Math
Tyrone's bank account had a balance of -\$61.25 last week. His paycheck of \$291.75 was deposited this week. What is his bank account balance now?

PHYSICS
An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a magnitude of 6.2 N ; a second force has a magnitude of 5.0 N and points in the negative y direction Find the magnitude of the third force ...

math
dev has 120 stickers.he is going to get some more stickers,n,from his friend.write an expression using n to show how many stickers dev will have. please could you do it quickly i have to give this in after the half term and the other question i did!!!

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