# Posts by Amy

Total # Posts: 4,317

1. ### History

Which was the leading hydroelectric power producer in 2006?
2. ### calc 1

The acceleration function (in m/s2) and the initial velocity v(0) are given for a particle moving along a line. a(t) = 2t + 2, v(0) = ?3, 0 ? t ? 3 (a) Find the velocity at time t. (b) Find the distance traveled during the given time interval.
3. ### Physics

In separate experiments, an object is placed 12.0 cm in front of two different mirrors: a flat mirror and a convex mirror. The image formed by the convex mirror is 4.0 cm closer to the mirror than the image formed by the plane mirror. Determine the focal length of the convex ...
4. ### Physics

When the light of a wavelength 450 nm is passed through a certain diffraction grating, the first order diffraction maximum is found to be at an angle of 35° to the straight through. Calculate the distance between adjacent slits in the grating
5. ### Math

Find the consumer surplus at the equilibrium point.(I keep using the formula listed below but get a completely different answer from what the book says. I am a visual person so please show me step by step so I can see where I went wrong. D(x)=(x-6)^2 ; x=3 Formula: D(x)-QP The...
6. ### Calculus 1

y= 3/x^3; [1,3] Find the area under the graph of the function over the integral given. The book answer is 4/3
7. ### Physics

The pupil of an eagle’s eye has a diameter of 6.0 mm. Two field mice are separated by 0.010 m. From a distance of 186 m, the eagle sees them as one unresolved object and dives toward them at a speed of 20 m/s. Assume that the eagle’s eye detects light that has a ...
8. ### Physics

A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). An object is placed to the left of the converging lens, and the final image produced by the two-lens combination lies 19.7 cm to the left of the diverging lens. How far is the ...
9. ### Physics

A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). An object is placed to the left of the converging lens, and the final image produced by the two-lens combination lies 19.7 cm to the left of the diverging lens. How far is the ...
10. ### Physics

A filmmaker wants to achieve an interesting visual effect by filming a scene through a converging lens with a focal length of 54.0 m. The lens is placed between the camera and a horse, which canters toward the camera at a constant speed of 7.8 m/s. The camera starts rolling ...
11. ### Physics

The frequency of a light wave is the same when the light travels in ethyl alcohol or in carbon disulfide. Find the ratio of the wavelength of the light in ethyl alcohol to that in carbon disulfide. The refractive indices n of carbon disulfide and ethyl alcohol are n(disulfide...
12. ### Chemistry 2 - pH

You are given an aqueous salt solution and have determined that its pH is 5.19 at 25°C. Predict which of the following three salt solutions it is most likely to be. solution (1): a solution of ammonium nitrate (NH4NO3) solution (2): a solution of potassium bromate (KBrO3) ...
13. ### Physics

A driver in a car traveling at a speed of 56.6 mi/h sees a deer 106 m away on the road. Calculate the magnitude of the acceleration necessary for the car to stop just barely missing the deer (assuming that the deer does not move in the meantime). Answer in units of m/s

educational*
15. ### educatial technology

which of the following statements is true of a time management plan? a. it is a work in progress that will need to be altered many times b. the plan you create is the one you should stick with c. you dont need to schedule breaks or free time d. it isnt important to follow it ...
16. ### Social studies

I am doing the same test as her. In this homeshcool. I am also looking for the awnser.
17. ### Math

The local swimming pool is having a contest and all students are welcome to enter. The pool officials want a new logo that has rotational symmetry with 120? and 240? as its angles of rotation. Draw an entry for the contest.
18. ### Pre-Calc

cos^3 = (1/2 cosx)(1+cos2x) Please make the left match the right.
19. ### Math

A balloon has a diameter of 10 inches and a height of 20 inches. How much helium will it take to fill the balloon in inches cubed
20. ### 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 ...
21. ### 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 ...

23. ### 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
24. ### 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 ?
25. ### 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...
26. ### 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 ...
27. ### Math

Nevermind I understand now, thank you!
28. ### Math

For a wouldn't the equation be -1(x^2 + 18x + 20) ??
29. ### 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 ...
30. ### 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.
31. ### math

3 times a number is greater than half of the number by 50. What is the number?
32. ### Genetics

Describe how chromosomes are cultured and prepared for laboratory analysis?
33. ### Science

Difference between prokaryotes and eukaryotes
34. ### Genetics

Describe how chromosomes are cultured and prepared for laboratory analysis?
35. ### Science

Explain water potential and how it affects osmosis?
36. ### Genetics

Explain the chromosomal differences between males and females?
37. ### Physics

Got it, thank you very much.
38. ### Physics

sorry 13.05^2
39. ### Physics

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

Thank you!
41. ### 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?
42. ### history

In what way does Saudi Arabia play an important role in foreign and security aspects in the Middle East
43. ### Social Studies

Why is the legacy of colonial powers a barrier to democracy in the Middle East?
44. ### 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.
45. ### 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
46. ### 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?
47. ### 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 ...
48. ### Essay Writing

Thanks! And any suggestions on how to make an interesting intro?
49. ### 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 :)
50. ### math

A fruit seller sold 234 apples.He sold twice as many apples as mangoes.how many more apples did he sell?
51. ### 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?
52. ### Microbiology

How would you determine the minimum bactericidal concentration of a given microbial agent?
53. ### Science

Why is it important that scientists communicate with each other
54. ### English

Which passage would best reflect Gatsby personality and why ? From the book called Great Gatsby
55. ### 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
56. ### 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...
57. ### physics

What I did is v = distance / t 153 = d / 1.68 d = 257 m
58. ### 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
59. ### 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.
60. ### 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!
61. ### 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?
62. ### 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).
63. ### 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 ...

3. D? 4. B?
65. ### 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 ...
66. ### Social studies

if y'all don't know why are you commenting.... geesh
67. ### 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?
68. ### 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
69. ### 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
70. ### 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.
71. ### 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!
72. ### 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...
73. ### 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...
74. ### 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 ...
75. ### 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!
76. ### 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...
77. ### 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...
78. ### 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
79. ### 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...

Thank you!!
81. ### 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!!

2.5
83. ### 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...
84. ### Physics

Sorry I meant to write 200g
85. ### 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...
86. ### 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 ...
87. ### math

3 fourth of a class are boys. The girls are 24 less than the boys. How many pupils are in the class?
88. ### 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

Thank u
90. ### Math

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

Im not sure where to start
92. ### 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?
93. ### 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?
94. ### Math

Thanks Ms. Sue
95. ### Math

Lol... Sorry is this better? 3.75
96. ### Math

Is this correct? 49.8
97. ### 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?

Thank u
99. ### Math

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

What does this mean >
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