Wednesday
August 27, 2014

Posts by sammy

Total # Posts: 449

Science
Why are aboriginal clan systems considered a human social system?
October 10, 2012

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?
October 8, 2012

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?
October 2, 2012

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...
September 29, 2012

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 ...
September 29, 2012

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?
September 29, 2012

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?
September 29, 2012

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 ...
September 29, 2012

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 ...
September 29, 2012

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?
September 29, 2012

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 ...
September 29, 2012

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...
September 29, 2012

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 ...
September 29, 2012

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 ...
September 29, 2012

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 ...
September 29, 2012

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?
September 29, 2012

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 ...
September 29, 2012

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 ...
September 29, 2012

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 ...
September 29, 2012

math
twelve less than a number is 19. what is the number?
September 28, 2012

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?
September 24, 2012

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?
September 24, 2012

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 ...
July 24, 2012

Calculus
Thank you so much!!!!!
July 10, 2012

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!!!!!
July 10, 2012

MATH
Solve the following system of equations for the unknown variables. a + b = 7 a + c = 12 b + c = 15
July 7, 2012

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.
June 25, 2012

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?
June 15, 2012

Spanish-Thank you
Thank you Ms. Sue for sending this-I'll check back later to see if there is an answer
May 26, 2012

¿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 ...
May 26, 2012

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 ...
March 28, 2012

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 ...
March 22, 2012

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 &...
March 15, 2012

Math(alg2)
solve the exponential equation 5(2)^2x - 4 = 13 thanks
March 13, 2012

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
March 2, 2012

chem
How much heat is required to heat 0.1 g of ice at −30 degrees C to steam at 100 degrees C
March 1, 2012

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
March 1, 2012

physics
If a wheel 211 cm in diameter takes 2.25 s for each revolution, find its period. T=?s
February 18, 2012

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?
January 25, 2012

Thank you very much
January 25, 2012

I'm not sure if SraJMcGin is still answering questions but I would appreciate her checking this if she still does Thank you
January 25, 2012

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.
January 25, 2012

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, ...
January 18, 2012

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...
January 18, 2012

spanish
January 6, 2012

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. ...
December 4, 2011

Mnagemeny
I need assistance with a problem. can anyone help?
November 19, 2011

Math
Change them all to the same denominator. The common denominator is 120
November 11, 2011

math
November 10, 2011

algebra
m to the second
November 10, 2011

algebra
There is no answer. You cannot divide by 0.
November 10, 2011

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
November 8, 2011

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 ...
November 3, 2011

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.
November 3, 2011

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?
October 23, 2011

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
October 22, 2011

Physics
Awesome, thanks!
October 19, 2011

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?
October 19, 2011

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?
October 19, 2011

Physics
Hi! Sorry the math for the proposed answer is wrong. The equation was manipulated incorrectly and will give a wrong answer
October 17, 2011

ochem
is cis-1,2-dimethylcyclohexane a conformational isomer of trans-1,2-dimethylcycloehexane? Please explain.
October 13, 2011

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!!!!
October 2, 2011

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 ...
September 29, 2011

MATH
85,700,038
September 28, 2011

sequence of 2,5,14,41
September 26, 2011

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.
September 21, 2011

chemistry
A student suspected that an unknown was undergoing a chemical change at its melting point. Suggest a simple method for testing this hypothesis.
September 15, 2011

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 ...
September 13, 2011

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...
September 13, 2011

chem101
Why is CH3CH2NH2 the least acidic?
September 11, 2011

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
September 11, 2011

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.
September 1, 2011

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.
September 1, 2011

math
September 1, 2011

Science
Abbreviations you can use for science?
August 25, 2011

100,000
July 25, 2011

Trigonometry
Solve: 2 cos[x-ð/8]-sqrt2=0
May 30, 2011

Trigonometry
If tan theta= 3 and ð<theta< 3ð/2, find cos theta.
May 30, 2011

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
May 9, 2011

math
47 divide by 6
May 4, 2011

speech
why is australia a luck contry
May 3, 2011

\$3,000,000,000,000,000 how much is this in words?
May 2, 2011

math
which of the numbers are integers? 11/3,9.7,-163,-3/8,1
April 26, 2011

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.
April 25, 2011

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...
April 25, 2011

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
April 20, 2011

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.
April 19, 2011

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.
April 18, 2011

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 ...
April 18, 2011

Math
Thanks so much!
April 18, 2011

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 ...
April 18, 2011

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 ...
April 17, 2011

Math
April 13, 2011

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...
April 11, 2011

Math
Vera wrapped a package that measured 8 in. by 10 in. by 5 in. Find the surface are of the package. I really don't know why I'm having trouble with this problem, but for some reason I just don't know where to start it.
April 5, 2011

Math
Which measure of central tendency best describes these data? 100, 5, 90, 95, 100 A. the mode only B. the mean and the median C. the mean only D. the median only I've never really understood central tendency
March 31, 2011

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