# Posts by ANON

Total # Posts: 2,819

College Physics
Dry Ice. At standard atmospheric pressure, the solid form of carbon dioxide called “dry ice” undergoes a phase change not to a liquid but straight to a gas. This process is called sublimation, and like other phase transitions heat energy is required. In this case it ...

PHYSICS
a) How much energy is required to evaporate all the water in a swimming pool of area 158 m2 and depth 4.1 m (b) The intensity of sunlight is about 1080 W/m2. If all of this energy is absorbed by the water in the pool, how long will it take for take the water to evaporate?

computer
thanks for the help :)

computer
it is a timeline,what i mean is example.thanks :)

computer
recently developed computer technology and give its description,inventor,year invented and the purpose why it was developed.

math
what am i supposed to do?

Chemistry
my discussion is tomorrow thanks guys ;)

Math
this is math. not in reality. you have to use a proportion and that's what i need help with.

Math
Your heart bears 240 times in 4 minutes. What is your heart rate in beats per second? Explain

Physics
Two nearby nodes of a standing wave are separated by 4.5 m. If the frequency of the wave is 184 Hz, what is the speed of the wave?

spirituality and supernatural
We can see that spirituality and the supernatural plays a large role in any culture and society, it's influence can be seen in the Buddhist sects of Japan. How this influence is seen within the Japanese culture through modern media and films. How do films and media display...

Opinion on Myths
What do you make of the similarities between Japanese and Greek myths (for lack of a better word)?

opinion
Do you think that fantasy movies about social issues help to bring the right kind of attention to the matter, or do they detract and/or lessen it's actual severity?

i don't know it that's why i'm asking u.

bella baked 6 dozen cookies. she wants to keep 1 dozen and give the rest to 20 friends. she wants to give an equal number of cookies to each friend. how many cookies does each friend get? justify your answer.

chris has some rice cakes and 1 granola bar as a snack. the snack contained a total of 560 calories. if the granola bar had 120 calories and each rice had 40 calories, how many rice cakes did chris have? explain

liz earns a weekly salary of \$459 and \$20 per hour for each overtime hour she works. this week her total pay including salary and overtime pay was \$559. write an equation to represent this situation. how many hours of overtime did liz work?

sal's movie rental club membership costs \$11 per month. with a membership, each movie costs \$2. sal's monthly movie rental charge was \$23. how many movies did sal rent?

Math
three friends each own land in the same town. Miguel owns 71/2 acres. Jorge & Juanita own the same number of acres. if the friends own 20 1/3 acres altogether, how many acres do Jorge and Juanita owns?

Math
Vicky uses 1 2/3 cup milk for a muffin recipe. If she wants to make 3 times the amount of muffins, how much milk will she use?

Math
Leroy ran a total of 15 miles last month. He ran 5/8 mile each day. How many days did he run?

College Physics
A steel piano string for the note middle C is about 0.68 m long and is under a tension of 400 N. If the fundamental frequency is 226 Hz, what is the string’s diameter?

College Physics
A child plays on a bungee cord and oscillates with a certain frequency f. An adult with a mass that is 16 times greater than that of the child then uses the same bungee cord. What is the ratio of the frequency with the adult to the frequency with the child? I tried to answer ...

statistics
Help me! Population of heights of college students is approximately normally distributed with a mean of 64.37 inches and standard deviation of 6.26 inches A random sample of 74 heights is obtained. Find the mean and standard error of the x bar distribution 2. Find P(xbar > ...

statistics
If a population has a standard deviation of 5 units what is the standard error of the mean if samples of size 25 units are selected????

Anime
How would you differentiate anime from American animated series/films? Is it in the story-line, art, etc.? Do they influence one another? Also, how has anime evolved over time, and what exactly is its purpose?

s.s
i mean i understand where you are coming from all im sying is there is no need to be rude about it :)

s.s
Ms. sue i just have one question for you why do you have to jump into every post and be such a snarky stick int he mud i mean people need help alot of the books suck and public school teachers don't care anymore i mean people come and ask for help and you just spit in ...

critical thinking.
which of the following is the best example of "negative evidence" for the claim," samsung makes excellent quality phones"? A. 50.6 of htc evo users prefer evo to samsung's android. B. the main competitors of samsung are htc,nokia and black barry. C. 4 ...

I was wrong. For question 2 I'm think it's C. (hope I'm right) and for the truth and false question .I think its true. but i'm not sure!

Truth or False : for business writing,it is always best to present the most analytical, matter of fact writing in order to be convincing. most claims in business,and in persuasive writing generally tend to be contestable claims.this requires the author of the argument to do ...

Chemistry
A person suffering from hyponatremia has a sodium ion concentration in the blood of 0.118 Mand a total blood volume of 4.6 L.What mass of sodium chloride would need to be added to the blood to bring the sodium ion concentration up to 0.138 M, assuming no change in blood volume?

Chemistry
(a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid? (c) How many milliliters of 6.00 MNaOH solution are needed to provide 0.325 mol of NaOH?

Chemistry
An aqueous solution of an unknown solute is tested with litmus paper and found to be acidic. The solution is weakly conducting compared with a solution of NaCl of the same concentration. Which of the following substances could the unknown be: KOH,NH3,HNO3, KClO2, H3PO3, ...

Opinion
Generally speaking, what can we learn from a society's villains faced by its heroes that we can't learn from its heroes? Is it easier for you (personally) to understand what a villain represents than a hero? On a similar note, do you think it's easier to say what ...

science
In what direction do you turn the coarse focus adjustment know to move the object away from your slide? In what direction do you turn the fine adjusment?

Chemistry
1)What could have caused the impurity in the sodium hydroxide solution... 2)Why was it necessary to dilute the hydrochloric acid before carrying out the titration This was a question from a titration practical in which we had to dilute HCL then use that along with 25cm3 of ...

physics
A person can jump a maximum horizontal distance (by using a 45 projectile angle) of 5 m on Earth. What would be the maximum range on Mars, where the acceleration due to gravity is 0.38 g?

A long jumper leaves the ground at an angle of 25.2 to the horizontal and at a speed of 11.2 m/s. How far does he jump? The acceleration due to gravity is 9.8 m/s2 . Answer in units of m What maximum height does he reach?

chemistry
DrBob222's solution worked. The answer for 2.20g CO2 from 4g sample is 64.35%. Hope this helps someone with their Sapling HW.

Physics Honors
@ K, You should check your work before posting an answer. The correct answer should be a) 3.5s b) 21m

Physics
The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 4.0 1011 m. Find the period of the orbit IN SECONDS!!!???

Fighting Style
Which fighting style is mainly used in modern day films and why? With Bruce Lee creating his own style of martial arts, what research did Bruce Lee had to do for his his style Jeet Kun Do to be successful and does it still exist in modern times? Does the Jeet Kun Do style used...

College Physics
In Chapter 3 we learned that the force of air drag on an object moving rapidly through the air is proportional to v2, where v is the speed of the ball relative to the air. The same relation applies to the force of the wind on the blades of a wind turbine (Figure 9.4), where v ...

College Physics
A rod of mass 4.3 kg and length 4.3 m hangs from a hinge as shown in Figure P9.28. The end of the rod is then given a “kick” so that it is moving at a speed of 2.3 m/s. How high will the rod swing? Express your answer in terms of the angle (in degree) that the rod ...

Physics
I tried that and did not get the right answer. I think I need to use KE_i + PE_i = KE_f + PE_f ... which would be: .5mv_i^2 + 1/2Iw_i^2 + mgh_i = 1/2mv_f^2 + .5Iw_f^2 +mgh_f --> I= 2/5mr^2 for a solid sphere I factored out the mass on both sides but my problem is that I ...

Physics
A bowling ball is rolled up an incline. If the ball has a speed of 12 m/s at the base of the incline, to what height h on the incline will the center mass travel?

Chemistry
Determine the pH of a 0.10 M MgCl2 solution.

Physics
You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 69 m above the surface of the lake. You dive of the cliff doing somersaults so as to have an angular speed of 5.5 rev/s. How many revolutions do you make before you hit the water...

Chemistry
How many milliliters of a 0.66 M HCl solution are needed to react completely with 1.9 g of zinc to form zinc(II) chloride?

Science
surrounding, surroundings

pre calculus
I can't believe it's that simple, I have been going crazy! Thank you!

pre calculus
Change the exponentioanl expression to an equivalent expression involving a logarithm. e^-1/3 = 9t Somebody help PLease!

physics
A car travels along a straight stretch of road. It proceeds for 14 mi at 50 mi/h, then 28.3 mi at 48 mi/h, and finally 37.4 mi at 38.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h Can u show the steps and answer to it, thanks.

Chem
After filling a flask with water and allowing 15 minutes in a water bath, a student finds that the water level has dropped. How is this possible?

Chemistry
Thanks. I think I get it, but I don't know how to get the mass...

physics
A car travels along a straight stretch of road. It proceeds for 14 mi at 50 mi/h, then 28.3 mi at 48 mi/h, and finally 37.4 mi at 38.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h Can u show me the steps to this problem.

physics
A car travels in a straight line for 5 h at a constant speed of 73 km/h . What is its acceleration? Answer in units of m/s2

physics
can u show me the steps to the problem. thanks

physics
A car travels along a straight stretch of road. It proceeds for 14 mi at 50 mi/h, then 28.3 mi at 48 mi/h, and finally 37.4 mi at 38.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h

Physics
A baseball pitcher can throw a baseball at a velocity of 44.5 m/s. If the mass of the ball is 0.12 kg and the pitcher has it in his hand over a distance of 1.79 m, what is the average force exerted by the pitcher on the ball?

physics
A car travels in a straight line for 4.9 h at a constant speed of 73 km/h . What is its acceleration? Answer in units of m/s2

physics
A car travels along a straight stretch of road. It proceeds for 15 mi at 51 mi/h, then 28.2 mi at 44 mi/h, and finally 36.4 mi at 39.3 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h

physics
If a race car completes a 3 mi oval track in 50 s, what is its average speed? Did the car accelerate? 1. Yes, the speed changed. 2. No, the speed didn’t change. 3. Yes, the direction of the motion changed.

physics
A jet travels at 433 m/s. How long does it take to travel 210 m? Answer in units of s How long to travel 12.4 km? Answer in units of s How long to travel 11 in? Answer in units of s thank you

SAT algebra
yeah, don't pay attention to original answerer... they are totally wrong. i'm looking for help too :|

Physics
In recent years a number of nearby stars have been found to possess planets. Suppose the orbital radius of such a planet is found to be 5.5 x1011 m, with a period of 1210 days. Find the mass of the star.

Physics
A stone of mass 3.2 kg is tied to a string of length 0.9 m, and is swung in a horizontal circle with speed v. The string has a breaking point force of 10.1 N. What is the largest value that v can have without breaking the string?

Physics
In the game of baseball, a pitcher throws a curve ball with as much spin as possible. This spin makes the ball “curve” on its way to the batter. In a typical case, the ball spins at about 20.5 revolutions per minute. What is the maximum centripetal acceleration of a ...

calculus
So, the question is stating that the time period you are looking for is when the ball is thrown at 1 second and goes to .1 second. So, you want the velocity of the ball at the interval [1,1.1]. Velocity is the change in distance/ change in time. What is the change of the ...

AP Chemistry
What is the weight of 6.3 × 10 21 atoms of phosphorus? Answer in units of g

College Physics
A person riding a bicycle on level ground at a speed of 10.6 m/s throws a baseball forward at a speed of 19.1 m/s relative to the bicycle at an angle of 41° relative to the horizontal (x) direction. (a) If the ball is released from a height of 1.3 m, how far does the ball ...

College Physics
A cable attached to a block of mass 16.35 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 9.36 N, what is the coefficient of kinetic friction between the block and the floor? not sure how to do this one ... I am thinking I use...

College Physics
A hockey puck slides with an initial speed of 43.2 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.036, what is the speed of the puck after 10.4 s?

College Physics
A constant force of 2854 N acts on a spacecraft of mass 6100 kg that has an initial velocity of 32 m/s. How far has the spacecraft traveled when it reaches a velocity of 1170 m/s? I used: Vo=32 m/s, Vf=1170 m/s, F= 2854 N, and mass= 6100 kg I then solved for a by taking N/kg...

Physics
A hockey puck slides with an initial speed of 43.2 m/s on a large frozen lake. If the coefficient of kinetic friction between the puck and the ice is 0.036, what is the speed of the puck after 10.4 s?

science
I need a hypothesis that I did not use already to determine which bees will fly further-the older ones or the younger ones.any ideas?

math solution
not sure but you can try multiplying all the numbers

Atomic Number Chem
The atomic number of fluorine is 9. What is the mass number of a fluorine atom with 8 neutrons?

physics

Physics/Algebra
Oh, yes. I am sorry. I am attempting to calculate the height of the fountain. It does indeed seem rather high. But the numbers for my assignment are randomly generated. So that may explain this phenomenon. Thank you for your help.

Physics/Algebra
A student walks around a pool and estimates the pool has a circumference of 240 m. Using a protractor the students gages the angle of elevation to the top of the fountain, in the center of the pool, to be 74 degrees.

Algebra
Thank you. :D

Algebra
Consider the system: 9x-6y=78 -4y-14x=-68 Find X I have attempted to work through the problem three times, and am having difficulty knowing exactly what to do. Thank you for your help. c:

PHYSICS
k=2.6*9.8/.05 N/m Make sure you take the difference of the stretched string versus the one without any weight. How long should be x = 4*9.8/k

chemistry
HAHAHAHAHAHAHAHA!!!!!!11!1!!one1! that's hilarious... but the answer is -3.2*10^3

Physics
A 17 g rifle bullet traveling 220 m/s buries itself in a 3.9 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's displacement. Horizantal ____ J Vertical _____ J

com 155
11. rainforest is one word

apchem
can someone explain the synthesis reaction from ethane to acetylene?

precalc
find the domain and range of the following as an inequality and interval notation. y=sqrtx-3 2: y=3x+5 3: y= 2/x-7 4; y=2+sqrt x

calc
x^2=10-4x

modeling and equation solving
using a formla to relate variable quantities associated with the phenomena. a pizza place sells rectangular 18" by 24" pizza for the same price as its large round 24" diameter. if both are the same thickness which option gives you the most pizza for the money.

ENGLISH
1 is A 2 is D 3 I don't know 4 is D 5 is A 6 is D 7 I don't know 8 I don't know I think D 9 is C Hope this helps and next time just ask your teacher she is there to help

chemistry
Hi, I happen to have the same problem in my chemistry book and know an easier way! My professor taught it to us, but I forgot and started searching Google and then after reading DrBob's solution realized I knew how to do it an easier way. Use the equation NMV = NMV. One ...

Physical Science
The soup in a bowl is too hot to eat. Although there are no ice cubes in the freezer, there are several stainless steel spoons that have been stored in the freezer for several hours. By placing the cold spoons in the hot soup, the soup's temperature is lowered from a ...

OChem
Why would diethylammonium chloride insoluble in ether? Is the only reason why the salt is insoluble because of polarity, or are there other reasons why? Please explain.

Ochem
Diethyl ether is used as a solvent for the reaction of diethylamine with m-toluoyl chloride. Why is a solvent necessary for this reaction?

History
What is the point of this site*

History
what is the point of this class if nobody answers questions but instead says "...no one here will do your homework for you". Study guides and answers do not mean the person will plagiarize your answer. Thanks for the help anyways..

Organic Chemistry
thank you very much for the help.

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