Sunday

April 20, 2014

April 20, 2014

Total # Posts: 454

**Science**

Why are aboriginal clan systems considered a human social system?

**physics**

A satellite circles the earth in an orbit whose radius is 2.01 times the earth's radius. The earth's mass is 5.98 x 1024 kg, and its radius is 6.38 x 106 m. What is the period of the satellite?

**Math**

If the length of the hour and the minute hands of a clock are 4 cm and 6 cm, respectively, what is the distance in cm between the tips of the hands at two o'clock?

**physics**

Two separate seismograph stations receive indication of an earthquake in the form of a wave traveling to them in a straight line from the epicenter and shaking the ground at their locations. Station B is 60 due east of station A. The epicenter is located due north of station A...

**physics**

Ilya and Anya each can run at a speed of 7.80 and walk at a speed of 3.20 . They set off together on a route of length 5.00 . Anya walks half of the distance and runs the other half, while Ilya walks half of the time and runs the other half. Part A How long does it take Anya t...

**physics**

A boy throws a stone straight upward with an initial speed of 12.0 Part A What maximum height will the stone reach before falling back down?

**physics**

Four identical masses of 3.5 each are located at the corners of a square with 1.8 sides. Part A What is the net force on any one of the masses?

**physics**

Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force . (Figure 1) The magnitude of the tension in the string between blocks B and C is = 3.00 . Assume that each block has mass = 0.400 . Part A What is ...

**physics**

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . When a horizontal force of 340 is applied to a 68.0 box, the box slides on a level floor, opposed by a force of kinetic friction of 150 . Part A What is the magnitude of the accelerat...

**physics**

A 125 object is taken to a height of 210 above the Earth's surface. Part A What is the object's mass at this height? Part B What is the object's weight at this height?

**physics**

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 0.80 is sliding freely across a section of very smooth (frictionless) horizontal ice. Part A When it is sliding freely, how does the upward force of the ...

**physics**

A Superball is dropped from a height of 2.4 and rebounds off the floor to a height of 1.9 . Part A If the ball is in contact with the floor for 0.70 , determine the direction of the ball’s average acceleration due to the floor. If the ball is in contact with the floor for...

**physics**

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A block of mass 23.0 slides down a frictionless surface inclined at 35. Part A To ensure that the block does not accelerate, what is the magnitude of the smallest force that you must ...

**physics**

During liftoff, a hot-air balloon accelerates upward at a rate of 2.5 . The balloonist drops an object over the side of the gondola when the speed is 12 . a)What is the magnitude of the object’s acceleration after it is released (relative to the ground)? Part B What is th...

**physics**

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . A 3000 truck tows a 1500 car by a chain. Part A If the net forward force on the truck by the ground is 3500 , what is the acceleration of the car? Part B What is the tension in the co...

**physics**

A bullet traveling horizontally at a speed of 350 hits a board perpendicular to its surface, passes through and emerges on the other side at a speed of 230 . If the board is 3.80 thick, how long does the bullet take to pass through it?

**physics**

At the Indianapolis 500 time trials, each car makes four consecutive laps, with its overall or average speed determining that car’s place on race day. Each lap covers 2.5 (exact). During a practice run, cautiously and gradually taking his car faster and faster, a driver r...

**physics**

A regional airline flight consists of two legs with an intermediate stop. The airplane flies 380 due north from airport A to airport B. From there, it flies 260 due east to its final destination at airport C. Part A What is the magnitude of the plane’s displacement from i...

**physics**

The acceleration due to gravity near a planet's surface is known to be 3.20 . Part A If the escape speed from the planet is 9.54 , determine its radius. Part B Find the mass of the planet. Part C If a probe is launched from its surface with a speed twice the escape speed a...

**math**

twelve less than a number is 19. what is the number?

**Physics **

Using T-charts A marble it dropped from a stair well that is 4.3 m high. (a) How long will the marble be in the air for? (b) What speed will it be traveling at as it hits the ground?

**Physics**

If it takes 2.37 seconds for a stone to hit the ground from a cliff. (a) From what height was the stone dropped from? (b) What is the stones final velocity when it hits the ground?

**college stat**

Use the graphic to show the sampling distributions of means for the sample from Prison A (n=82) and the sample from Prison B (n=37). Mark the expected value of the mean and the standard units. Shade in the critical zone for alpha = .05.Locate each sample mean after you have ma...

**Calculus**

Thank you so much!!!!!

**Calculus**

Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=5x^(1/2) , y=4 and 2y+1x=6 I've been trying this problem for about 3 hours. Please help!!!!!

**MATH**

Solve the following system of equations for the unknown variables. a + b = 7 a + c = 12 b + c = 15

**Precalculus**

If Sin A=3/5 and cos B= -12/13, find the value of sin(A-B) if Angle A is in Quadrant I and angle B is in Quadrant III.

**Physics help please!**

A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0230 m deeper into the water. What is the weight of the rock?

**Spanish-Thank you **

Thank you Ms. Sue for sending this-I'll check back later to see if there is an answer

**Spanish-Please check if I answered these correctly**

¿Cuando te cepillas los dientes? Me cepillo los dientes por la mañana. ¿Qué puedes encontrar en tu ciudad o pueblo? Puedo encontrar un parque. ¿Qué vas a hacer con tu familia cuando vas de vacaciones? Quiero a ir a la playa en Hawaii ...

**AP Biology**

In 1918 a particularly virulent strain of influenza (an RNA virus) wiped out millions of health humans in the prime of their lives. Epidemiologists fear that such a super bug could revisit us in the future. And thus there was quest to find samples of the virus, and make a vacc...

**Math**

A company that produces a particular machine component has 3 factories, one each in Buffalo, Detroit, and Pittsburgh. 39% of the components produced come from the Buffalo factory, 36% of the components come from the Detroit factory, and 25% of the components come from the Pitt...

**Algebra 2**

Write a rule for the nth term of the arithmetic sequence. ( I'm not sure how I'm suppose to write the numbers below a :C so bare with me ) a(2) = - 28, a(20) = 52 I used the formula a(n) = a(1) + ( n-1)d a(20) = a(1) + (20-1)d > 52 = a(1)+19d a(2) = a(1) + (2-1)d &g...

**Math(alg2)**

solve the exponential equation 5(2)^2x - 4 = 13 thanks

**science**

a car starts from a stopped position at a red light at the end of 30 second its speed is 20 meters per second what is the acceleration of the car

**chem**

How much heat is required to heat 0.1 g of ice at −30 degrees C to steam at 100 degrees C

**chem **

The standard molar heat of vaporiza- tion for water is 40.79 kJ/mol. How much energy would be required to vaporize 2.54 ×1010 molecules of water? Answer in units of kJ

**physics**

If a wheel 211 cm in diameter takes 2.25 s for each revolution, find its period. T=?s

**Chemistry**

Heating an ore of antimony (Sb2S3) in the presence of iron gives the element antimony and iron(II) sulfide. Sb2S3(s) + 3Fe(s) ---> 2Sb(s) + 3FeS(s) When 15.0 g Sb2Sb3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction?

**Spanish-9th gradePlease check**

Thank you

**Spanish-9th gradePlease check**

Thank you very much

**Spanish-Please check SraJMcGin if possible-9th gradePlease check**

I'm not sure if SraJMcGin is still answering questions but I would appreciate her checking this if she still does Thank you

**Spanish-9th gradePlease check**

I have a question-I have to write the verb correctly for these two sentences Did I do them correctly? 1. nosotros/lavarnos Nosotros nos lavamos. 2. yo/ponerme Yo me pongo.

**PreCal**

Projectile Motion: An object is propelled upward at an angle theta, 45 degree < theta <90 degree, to the horizontal with an initial velocity of v0 feet per second from the base of an inclined plane that makes an angle of 45 degree with the horizontal. If air is ignored, ...

**PreCal**

Angel of Elevation: You are skiing down a mountain with a vertical height of 1500 feet. The distance from the top of the mountain to the base is 3000 feet. What is the angle of elevation from the base to the top of the mountain? Traveling at 25 miles per hour, how long does it...

**spanish**

Adonde vas despues de comer?

**Economics**

so D?

**Economics**

If the government announced the economy is headed into an expansionary period of rising real GDP and prices, businesses would most likely respond by: a. lowering wages so that they could afford to hire more workers b. dismantling some of existing production facilities c. outso...

**Mnagemeny**

I need assistance with a problem. can anyone help?

**Math**

543

**Math**

Change them all to the same denominator. The common denominator is 120

**math**

600 times .06 times 12. Add this answer to 600.

**algebra**

m to the second

**algebra**

There is no answer. You cannot divide by 0.

**Algebra 2**

P=the principal ( the amount borrowed) R=the rate(percent) T=time the amount is borrowed I=interest You must multiply P R T together to get the interest

**ENGLISH**

PLEASE HELP !! Identify the pronoun in the sentence below. Also identify the class and noun function of the pronoun using the abbreviations from the chart. For intensive pronouns, put NONE for noun function. 1.Robert was successful because his planning paid off 2.Tim said he n...

**english**

Identify the pronoun in the sentence below. Also identify the class and noun function of the pronoun using the abbreviations from the chart. For intensive pronouns, put NONE for noun function. That was a very long phone call.

**physics**

The coefficient of static friction between the 3.0 kg crate and the 31° incline shown below is 0.300. What is the magnitude of the minimum force, F, that must be applied to the crate perpendicularly to the incline to prevent the crate from sliding down the incline?

**Spanish**

If I wanted to say "Those butterflies are the prettiest of all." would I say this sentence or should the "esas" be "estas"? Esas mariposas son las más bonitas de todas las mariposas

**Physics**

Awesome, thanks!

**Physics**

A force of 15.00 N to the right causes a 2.02 kg book to have a net acceleration of 0.81 m/s2 to the right. What is the frictional force acting on the book?

**Physics**

A pure copper penny is slid along a steel counter top. If the coefficient of kinetic friction between the copper and the steel is 0.36, what is the magnitude of the penny's acceleration?

**ochem**

is cis-1,2-dimethylcyclohexane a conformational isomer of trans-1,2-dimethylcycloehexane? Please explain.

**Science**

What did Sir Humphry Davy do with the battery he built? I've looked online and haven't been able to find anything. Please help me!!!!

**Statistics**

9 trucks arrive per hour. It takes 6 minutes after reaching the loading station. Two alternatives to modify the situation. One is to change the trucks and add a helper at the loading station at a cost of 50,0000. This would change the arrival time of the trucks to 6 per hour a...

**WRITE THE NUMERAL MATH**

3,000,859

**MATH**

85,700,038

**math 11 grade**

sequence of 2,5,14,41

**math**

^the answer is -12, it says so in the back of my book. But once everything is multiples of 1/32, simplify. then the problem should now be 24x-21x=-36 . then subtract that, you get 3x=-36 . -36/3=-12 therefore, your answer is x=-12. Don't forget the negative.

**chemistry**

A student suspected that an unknown was undergoing a chemical change at its melting point. Suggest a simple method for testing this hypothesis.

**English **

Also, for the first one-I've reread the paragraph, and now I think it would be two characters-Montrsor is the I and Fortunato is "he" because "you" is not a character,is it? Here is what I meant by number: 3Natural consequence is just something that nat...

**English **

We had to read the opening paragraph of "The Cask of Amontillado" and analyze it with the following questions. I really need help. I understand Montresor is going to seek revenge upon Fortunato. 1.In the first paragraph, how many characters are mentioned? I think 3 2...

**chem101**

Why is CH3CH2NH2 the least acidic?

**chem101**

which of the following compounds have polar bonds and a net dipole moment? a) H3COH b) H3CCOCH3 ALSO PLEASE CHECK THIS, RANK THE FOLLOWING FROM MOST TO LEAST ACIDIC COMPOUND: A)H2SO4>H3CCO2H>H20 B)H3CCH2NH2>H3CCH2OH>H3CCO2H

**math**

Add 3 to both sides. Result is 1/2x=6. Now multiply both sides by 2. This gives you 12. This is the final answer.

**Math**

I have a square cake. The cake is iced on top and all the sides. I need to cut the cake in 6 pieces all pieces getting the same amount of cake and icing. Please help me if possible with a diagram.

**math**

Use the quadratic formula

**Science**

Abbreviations you can use for science?

**4th grade math**

100,000

**4th grade math**

100,000

**math**

Bank america

**math**

Bank america

**Trigonometry**

Solve: 2 cos[x-ð/8]-sqrt2=0

**Trigonometry**

If tan theta= 3 and ð<theta< 3ð/2, find cos theta.

**Math (pre-algerbra)**

I've tried this sooo many times I have huge marks on my paper and I just can't figure it out: 3a/8-a/12+7/2=7

**math**

47 divide by 6

**speech**

why is australia a luck contry

**5 grade math**

$3,000,000,000,000,000 how much is this in words?

**math**

which of the numbers are integers? 11/3,9.7,-163,-3/8,1

**math**

The following scores were recorded on a 100-point examination: 95, 75, 76, 86, 96, 71, 68, 81, 95, 76, 69, 82, 93, 88, 94 Find the mean and median final examination scores.

**math**

1.)Name the property that is illustrated. a) 7 „e 6 ƒ 6 „e 7 b) 7 ƒy (1 ƒy 9) ƒ (7 ƒyƒn1) ƒy 9 2.) a) Identify the base in the following statement b) Solve for the amount. What is 81% of 285? 3.)a) Find the supplement of &...

**Math**

Corinne rolls two six-sided number cubes with sides labeled 1-6. What is the probability that she rolls a 6 on both cubes? A. 1/36 B. 1/12 C. 1/6 D. 1/3 I think its A

**chemistry**

The legal limit for drunkenness is 0.08 ( 0.08 grams of alcohol per 100ml of blood). expired air contains the following main gaseous components by volume: 74.1% N2; 15.0% O2; 6.0% H2O; 0.9% Ar; and 4.0% CO2 at 37 degrees Celcius and 1 atm. Determine the density of ethanol.

**Math**

Which statement is correct? A. All intergers are rational numbers. B. All irrational numbers are whole numbers. C. A real number must be a rational number. D. A repeating decimal is an irrational number I think it's either A or C.

**Math**

I have three more questions I do not understand. 1. Two points (-1,1) and (3,-2) are graphed on a coordinate plane. What is the shortest distance between the points? A. 3 B. 4 C. 5 D. 7 I have no idea how to do this. 2. Which expression represents the nth term in the sequence ...

**Math**

Thanks so much!

**Math**

The chart shows the number of cars sold per week at a car dealership during the month of June. Salesperson Week 1 Week 2 Week 3 Week 4 Tim 4 8 2 1 Geena 1 2 7 1 Rafael 2 1 5 4 Sonny 4 1 1 10 How should the data be displayed to make the most convincing argument that sales impro...

**Math**

Check my answer please? Yuri is wrapping presents. The first box measures 9 inches by 12 inches by 2 inches. He has a second box with dimensions that are each half of the length of the first box. How does the surface area of the second box compare with the surface are of the f...

**Math**

Could you please check my answer? Subtract: (6a+2b-5c)-(3a+2c) My answer was: 3a+2b-7c

**Math**

I'm confused on two questions that are kind of similiar: State the slope and y-intercept of y= -1/2x I know the slope is -1/2 but I don't know the y-intercept State the slope and y-intercept of y= 3x-4 I know the slope is 3, but I don't know if the y-intercept is 4...

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