Thursday

April 17, 2014

April 17, 2014

Total # Posts: 3,531

**biology**

thank you, i have seen that site. but it doesnt not explain the steps and process that the brain takes in order to make a person fall sleep

**biology**

What part of the brain controls sleep and how does it work. I am looking for a easy to understand answer because when i have searched i do not understand it.

**english**

is giving information(such as mentioning details about something that happened) considered part of ethos?

**physics--please help**

thank you soooo much...the answer is correct..thanks again for working on it for this long

**physics--please help**

yes they hit it at 256.7..i typed it wrong...i am still not getting the correct beat frequency

**physics--please help**

I am sorry..but this is not the right answer either

**physics--please help**

could you help me more with this?

**physics--please help**

You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound waves you hear 2...

**physics--please help**

You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound waves you hear 2...

**physics**

This doesn't give me the correct answer

**physics**

You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound waves you hear 2...

**physics--please help**

how do you find beat frequency?

**Math**

why does 1/(n(n+1)) converges?

**physics**

NEED HELP WITH ONLY PART C Two 135.1.0-W speakers, A and B, are separated by a distance D = 3.6 m. The speakers emit in-phase sound waves at a frequency f = 11800.0 Hz. Point P1 is located at x1= 4.50 m and y1 = 0 m; point P2 is located at x2 = 4.50 m and y2 = –y. a) Negl...

**physics--please help**

A half-open pipe is constructed to produce a fundamental frequency of 230 Hz when the air temperature is 17 °C. It is used in an overheated building when the temperature is 39 °C. Neglecting thermal expansion in the pipe, what frequency will be heard?

**algebra**

8-t/2=53

**Physics-Thermo**

Imagine a 600 g of water at 70oC in a piston-cylinder device. Initially, the 9-kg, 13-cm diameter piston rests on two stops such that the water occupies a volume of 0.2 m3. Heat is transferred to the system until the water is completely vaporized. Take the atmospheric pressure...

**thermodynamics**

A piston-cylinder device contains 100 g of ethylene gas initially at 27oC, 115 kPa. Ethylene is heated and the piston starts to rise until the volume reaches 90 L and merely touches a linear spring that has a spring constant of 60 kN/m. More heat is added until the piston rise...

**physics**

no

**physics**

The grid in a high-vacuume triode is usually kept negatively charged with respect to the cathode so that the electrons may be

**physics**

this gives me the answer for drag force

**physics**

A ball of circumference 71.5 cm and mass 640 g is forced to the bottom of a swimming pool and then released. After initially accelerating upward, it rises at a constant velocity. (The density of water is 103 kg/m3.) (a) Calculate the buoyant force on the ball.

**physics**

A child loses his balloon, which rises slowly into the sky. If the balloon is 13 cm in diameter when the child loses it, what is its diameter at the following altitudes? Assume that the balloon is very flexible and so surface tension can be neglected. (a) 2200 m

**physics**

A mass M = 5 kg moves with an initial speed v = 3 on a level frictionless air track. The mass is initially a distance D = 0.250 m away from a spring with k = 844 N/m, which is mounted rigidly at one end of the air track. The mass compresses the spring a maximum distance d, bef...

**chemistry**

are compressive strength and brittle the same thing..if not then what is the difference?

**math **

16stickers are placed in a box if one sticker Is drawn from the box which color is it most Likely to be? Key:-1 Red I I I Blue I I I I Yellow I I Green I I I I I I I

**chemistry**

the components in the following glycerolphospholipid are: O || CH2OC(CH2)14CH3 | O | || CHOC(CH2)14CH3 | O | || + CH2OPOCH2CH2NH3

**chemistry**

what is the difference between a nanocomposite and a nanotube?

**chemistry**

please give me an example of a nanocomposite material

**chemistry 30a**

What volume (in mL) of an 8% w/v acetic acid solution would be needed to form 2.2 L of carbon dioxide gas at 25.2 degrees Celsius and 0.9982 atm? Assume the acid is reacted with excess sodium bicarbonate, and round your final answer to two sig figs.

**Physics**

ions

**physics**

A box with a mass of 2 kg is lifted (without acceleration) through a height of 8.0 m in order to place it upon the shelf of a closet. (a) What is the increase in potential energy of the box? 1 . J (b) How much work was required to lift the box to this position? 2 J

**Physics**

A roller-coaster car with a mass of 650 kg starts at rest from a point 28 m above the ground. At point B, it is 14 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? 1 . kJ (b) What is the potential energy at poi...

**Math**

The coordinates of the vertices of CDE are C(1, 4), D(3, 6), and E(7, 4). If the triangle is reflected over the line y = 3, what are the coordinates of the image of D? (3, –6) (3, –3) (3, 0) (3, 9)

**Geometry**

b.20 because 1:3:5 1+3+5=9 180/9=20 20:60:100

**1 geometry question**

The coordinates of the vertices of CDE are C(1, 4), D(3, 6), and E(7, 4). If the triangle is reflected over the line y = 3, what are the coordinates of the image of D? (3, –6) (3, –3) (3, 0) (3, 9) i have no clue

**Finance**

Which of the following has more interest risk? Why? A. Bond A with a 10% Coupon and a YTM of 10% which matures in 5 years. B. Bond B with a 10% Coupon and a YTM of 10% which matures in 11 years. C.) A share of Preferred Stock that pays $10 dividend in perpetuity with a require...

**Finance**

A proposed project has expected cash flows of $72,000 per year for 5 years. If the project has an initial cost of $400,000, what is the payback period (in years)?

**Finance**

You recently paid $31.50 for a share of Breaking Benjamin stock. Your required rate of return is 13% and you expect the company to increase dividends at a constant rate or 2.5% for the forseeable future. What was the most recent dividend of Breaking Benjamin?

**calculus**

A 29-ft chain with mass density 3 lb/ft is initially coiled on the ground. How much work is performed in lifting the chain so that it is fully extended (and one end touches the ground).

**chemistry**

How many molecules in 8.221g PbO2?

**geometry**

find the altitude of an equilateral triangle with side length twelve

**geometry**

the base of an isoscels triangle is 4x long. the altitude to the base is 3x cm long. Find the length of one other side of the triangle

**physics--please help**

When only the front wheels of an automobile are on a platform scale, the scale balances at 7.8 kN; when only the rear wheels are on the scale, it balances at 5.5 kN. What is the weight of the automobile? How far is its center of mass behind the front axle? (The distance betwee...

**physics**

When only the front wheels of an automobile are on a platform scale, the scale balances at 7.8 kN; when only the rear wheels are on the scale, it balances at 5.5 kN. What is the weight of the automobile? How far is its center of mass behind the front axle? The distance between...

**calculus**

find lim x->0 3- sqrt x+9/-x

**world history**

thank you

**world history**

i need a website that proves that because i have to do a bibliography for this section of the senior project

**world history**

training like a student teacher something like that isn't that consider as a training

**world history**

i'm working on my senior project and i need some help i'm supposed to do some researches about my future career, however i couldn't find a website that tells me if a world history teacher needs an additional training or not ?

**math Statistics**

Hi I need help with Statistics. Can anyone help me to understand it better? I am in fear that if I do not figure this out soon I will fail my class. I am needing help with the chapters 12,and 13. in the book called Statistical Reasoning in the Behavioral Sciences, 6th edition....

**physics--please help**

Only need help with part c--answer for part a is 2.94 radians and for b it is 777 days Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be i...

**physics**

Only need help with part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positione...

**Government**

Cross pressured v?

**last Government**

These voters are caught between conflicting issues. young voters independent voters strong party voters cross-pressured voters

**Government**

When party loyalists select the candidates of their party, they vote a propaganda ticket. straight-party ticket. cross-pressured vote. landslide.

**Physics to drwl please help**

Only need help with part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are position...

**Math**

18th

**physics**

I need only part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such ...

**physics**

I need only part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such t...

**physics**

thanks

**physics**

not the right answer

**physics**

A particle is moving clockwise in a circle of radius 1.54 m. At a certain instant, the magnitude of its acceleration is a = 26.0 m/s2,and the acceleration vector has an angle of θ = 50° with the position vector, as shown in the figure. At this instant, find the speed,...

**physics**

Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do ...

**physical science**

5/17=0.294 N

**physics**

it is d

**physics**

for L, are you using the answer from part a?? when i use that i get around 14 degrees

**physics**

Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do ...

**English 5 questions**

1. During this time period, writers sought to capture the _____________ of the American people during this era of a new postwar economy and society. peace anger anxiety all of the above 2. Like the modernists, postmodern writers focused on _____________ experience and emphasiz...

**physics**

thanks

**physics**

A man with a mass of 50 kg stands up in a 66-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How far does the canoe mo...

**1 chem question**

A base has a Kb of 2.5 x 10–11. Which of the following statements is true? This is a concentrated base. This base ionizes slightly in aqueous solution. This is a strong base. An aqueous solution of this base would be acidic. (do explain. i dont understand this one)

**physics**

A man with a mass of 52 kg stands up in a 66-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How far does the canoe mo...

**Physics**

Pepper pulls a 20.0 kg object along the floor accelerating at 2 m/s/s, and μ = .2. How much work has he done while pulling the string 5.0 m? If it takes her 1.0 seconds, how much power has she used? If 1.0 kcal = 4184 J, and an Oreo has 50 kcal, how many Oreos did Pepper ...

**Physics**

Pepper pulls a 20.0 kg object along the floor accelerating at 2 m/s/s, and μ = .2. How much work has he done while pulling the string 5.0 m? If it takes her 1.0 seconds, how much power has she used? If 1.0 kcal = 4184 J, and an Oreo has 50 kcal, how many Oreos did Pepper ...

**Chem**

Which of these solutions is the most basic? [H+] = 1 x 10–2 M [OH–] = 1 x 10–4 M [H+] = 1 x 10–11 M [OH–] = 1 x 10–13M i think its the first one?

**Chemistry**

I just wanted to say i found this question and if helped me so much with my homework! thank you so much DrBob222!!

**Algebra**

Find the square roots of 25

**Chem**

Which of the following statements is part of the kinetic theory? The particles of a gas move independently of each other. The particles in a gas move rapidly. The particles in a gas are relatively far apart. all of the above

**physics**

convert 52 g to kg and then 218 divided by that number

**physics**

I did that but i am not getting the right answer

**physics**

Betty Bodycheck (mB = 50.2 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 45.2 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° c...

**physics**

The question is what are their final kinetic energy?

**physics**

Betty Bodycheck (mB = 50 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 45.2 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° cou...

**physics**

This means that for every action, there is an equal and opposite reaction

**math**

454.86

**physics**

A billiard ball of mass 0.16 kg has a speed of 1.80 m/s and collides with the side of the billiard table at an angle of 34.6°. For this collision, the coefficient of restitution is 0.841. What is the angle relative to the side (in degrees) at which the ball moves away from...

**Psychology**

As a consumer of mental health services, which type of therapy would you prefer if you did not like to talk about your problems? If you were suffering from a phobia? If you had recurring nightmares since childhood? If you wanted to improve your marriage?

**trig**

if diameter of the circle is 100 cm. and length of the arc forming the angle is 360 cm. Assume that the earth is a perfect sphere of diameter 8000 miles. Find the distance between: Rome, Italy: latitude 42 degrees north Copenhagen, Denmark: latitude 54.3 degrees north

**Geometry**

What is the measures of the angles of a triangle that are in the extended ratio 2:2:8. What is the measure of the smallest angle?

**poetry**

what is the genre of the poem: tonight i can write by pablo neruda?

**English**

faith that he will one day be affirmed by white America. ???

**English**

The speaker in “I, Too, Sing America” survives adversity because he feels faith that he will one day be affirmed by white America. he has uncovered the hypocrisy around him. he is better than the people who are oppressing him. hope that he can one day run away from h...

**English**

F. Scott Fitzgerald dropped out of college to ..... begin writing. get married. join the army. work for his father.

**chemistry**

A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The alcohol content (alcoho...

**English**

Why don’t the narrator and the other man want to hold Edward for ransom? Is their motivation internal or external? in " Why, You Reckon?"

**calculus**

Solve for x: 2x=ex+1

**calculus**

Put the function P=40(39)t in the form P0e^kt. When written in this form, you have: k= ? P0= ?

**calculus**

I don't know if I'm typing it in wrong into my graphing calculator but I need to estimate the limits of sin(8 theta) / theta

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