Monday
April 21, 2014

Homework Help: Science

Branches of Science

Recent Science Questions

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science? (no question here)

Saturday, April 19, 2014 at 11:05am

Science
Looks like (B) to me.
Saturday, April 19, 2014 at 5:09am

Science
What is the main benefit of using scientific names instead of common names for organisms?   Scientific names have been around for much longer than common names have. Scientific names give everyone a shared terminology while common names can vary around the world. ...
Friday, April 18, 2014 at 11:37pm

science
without a figure, go figure.
Friday, April 18, 2014 at 5:09pm

Life science,consumer, life oriantation, geography, and maths literacy
Am in grd 10 am doing does subjects what careers or job I wii find
Friday, April 18, 2014 at 4:20pm

science
Water is flowing in a pipe as depicted in the figure. As shown, p = 113 kPa, d = 4.57 cm, d' = 3.22 cm, v = 4.40 m/s, and h = 1.25 m. What pressure is indicated on the upper pressure gauge? Take y = 0 at the bottom of the left pipe so that the center of the left pipe is y1...
Friday, April 18, 2014 at 3:39pm

science
explain the Eutectic and Eutectoid reaction in cast irons
Friday, April 18, 2014 at 12:43pm

Science
In the chromosomes of the egg and sperm.
Friday, April 18, 2014 at 12:12pm

sociology
Miranda has a theory that some people are able to “see the future.” She has tested this theory and found that she is unable to produce an individual with above chance predictions. She revises her theory to explain that when asked about the future, these people are ...
Friday, April 18, 2014 at 11:57am

Science
How does DNA get passed from one generation to the next?
Friday, April 18, 2014 at 11:16am

TO ANY SCIENCE HELPER
Ok, I kinda understand it now. Thank u so much :)
Thursday, April 17, 2014 at 11:44pm

TO ANY SCIENCE HELPER
You know the half life for carbon 14 is 5,730 years. If you aren't told that in the problem you can look it up. You can calculate the rate constant (which you will need later) this way. k = 0.693/t1/2 k = 0.693/5730 = 1.21E-4 Substitute this k into the equation below. ln(...
Thursday, April 17, 2014 at 11:41pm

TO ANY SCIENCE HELPER
Like say my question was a sample has 80% of its original carbon-14 present. How do I determine the age of the sample? Like I don't get how to get the answer, this concept is very difficult for me
Thursday, April 17, 2014 at 11:21pm

TO ANY SCIENCE HELPER
Why don't you post a problem and explain what you don't understand about it.
Thursday, April 17, 2014 at 9:33pm

TO ANY SCIENCE HELPER
It depends entirely on the problem. I don't have a clue what you are trying to figure out.
Thursday, April 17, 2014 at 9:13pm

TO ANY SCIENCE HELPER
I honestly don't get how to use radioactive dating to determine the age of a sample. I need an example and what to do in order to get the answer. I need it to be step by step. Thank u so much :)
Thursday, April 17, 2014 at 8:48pm

science
reference point i forgot where i learned this but for some weird reason its still in my head
Thursday, April 17, 2014 at 5:04pm

science
If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?
Thursday, April 17, 2014 at 4:51pm

science
Since this is not my area of expertise, I searched Google under the key words "when the first vertebrates evolved" to get these possible sources: https://www.google.com/search?client=saf​ari&rls=en&q=when+the+first+vertebrates+​evolved&ie=UTF-8&oe=UTF-8 ...
Thursday, April 17, 2014 at 3:10pm

science
if you wanted to consult the geologic time scale for when the first vertebrates evolved, where would you look?
Thursday, April 17, 2014 at 3:03pm

Math
Two kids are building a rocket for science class. once the rocket is launched its height in feet, h(t) can be found using the function h(t)=-16t^2+128t where t represents time in seconds. They record the time from the moment the rocket launches until it falls to the ground. (...
Thursday, April 17, 2014 at 12:31pm

science
What are psychoanalytical models? How have these models been used to explain human behavior? Which model do you feel is the most effective in explaining human behavior? Why?
Thursday, April 17, 2014 at 12:47am

Science
In pea plants, which color is dominant green or yellow?
Wednesday, April 16, 2014 at 10:01pm

Chemistry - Science (Dr. Bob222)
I have calculated K1 and K2 by dividing initial rate to initial concentration [A2], and I solved for Ea but for some reason I don't get the right answer, (which is 10.2KJ)
Wednesday, April 16, 2014 at 8:22pm

Chemistry - Science (Dr. Bob222)
See your other post above.
Wednesday, April 16, 2014 at 7:53pm

Chemistry - Science (Dr. Bob222)
Can't you simply plug in k1 and k2 along with T1 and T2 and solve for activation energy with the Arrhenius equation?
Wednesday, April 16, 2014 at 7:52pm

Chemistry - Science (Dr. Bob222)
Consider the kinetic data given in the table below for the first order reaction: What is the value of the activation energy? A_2_--> 2A Expt. Initial [A2] Temp. Initial Rate mol/L (°C) [A2]·s–1 1 0.10 100 1.2 x 10–3 2 0.20 200 4.8 x 10–3 3 0.15 ? 4...
Wednesday, April 16, 2014 at 7:18pm

science
m g h = Potential energy at top = 822 60 (9.81) h = 822 h = 1.4 meters
Wednesday, April 16, 2014 at 7:17pm

science
Alfredo, who has a mass of 60 kilograms, jumped off a retaining wall. His kinetic energy when he landed on the ground was 822 joules. How high was the wall?
Wednesday, April 16, 2014 at 7:05pm

Chemistry - Science (Dr. Bob222)
Consider the kinetic data given in the table below for the first order reaction: What is the value of the activation energy? A_2_--> 2A Expt. Initial [A2] Temp. Initial Rate mol/L (°C) [A2]·s–1 1 0.10 100 1.2 x 10–3 2 0.20 200 4.8 x 10–3 3 0.15 ? 4...
Wednesday, April 16, 2014 at 7:02pm

physical science
d = V*t = 800 m. V * 5/2 = 800 V = 320 m/s.
Wednesday, April 16, 2014 at 4:44pm

Science
zinc is mixed with Hydrochloric acid to form zinc chloride and hydrogen gas. if 7.3 grams of zinc completely reacts how much hydrogen gas will be created? if you collect the hydrogen over water at 23 degrees celcius and a barometric pressure of 770 mmHg and you recover 2.30 ...
Wednesday, April 16, 2014 at 4:37pm

Science URGENT help please
700 W
Wednesday, April 16, 2014 at 12:57pm

Science URGENT help please
Piano movers hoist a 200 kg piano 10 m high in 30 s using a rope and simple pulley. What is their power output? (Points : 1) 70 W 700 W 7,000 W 6 × 10^5 W
Wednesday, April 16, 2014 at 12:50pm

science
In the 1800s, it was believed women were good at working on projects to improve the community because (5 points) women were better leaders than men. women were better planners than men. women were more emotional than men. women were more moral than men. 2. Which factor ...
Wednesday, April 16, 2014 at 12:38pm

science(check answers)
1.A 2.D 3.B 4.C I hope I helped :)
Wednesday, April 16, 2014 at 12:14pm

Strategic Leaders
Are you asking about strategic leaders in government? or business? or ngo's? or science? or ????
Wednesday, April 16, 2014 at 10:55am

science (check new answer)
Youre not correct... Its not C its A
Wednesday, April 16, 2014 at 4:22am

Physical Science
Efficiency is "Efficiency = (useful work output / work input)" So the problem would look like: EC = (40/100) Divide 40 by 100, and you get 0.4 - which is 40%.
Tuesday, April 15, 2014 at 11:30pm

Science
A is the correct answer. Water is H2O and carbon dioxide is CO2. They have different physical properties (water is a liquid while CO2 is a gas at room temperature.) Both have a set ratio of atoms as shown by the formulas I've written. Water and CO2 have different chemical ...
Tuesday, April 15, 2014 at 10:17pm

science
Oh my! Twisted minds. I'm still smarting over carbon dioxide and water having the same physical properties.
Tuesday, April 15, 2014 at 9:46pm

science
I think DrBob means the days are shorter in the winter than in the summer.
Tuesday, April 15, 2014 at 9:43pm

science
Generally days are shorter in the winter than in the winter.
Tuesday, April 15, 2014 at 9:33pm

science
how does the amount of daylight in the summer compare to the amount of daylight we have in the winter?
Tuesday, April 15, 2014 at 9:31pm

Science
And a c'mon to Kalie, too. What are physical properties? What are chemical properties.
Tuesday, April 15, 2014 at 9:24pm

Science
I don't agree with that answer. Carbon dioxide is a gas; water is a liquid. And you think they have the same physical properties? C'mon.
Tuesday, April 15, 2014 at 9:22pm

Science
I think its C too, but I am not 100 percent sure.
Tuesday, April 15, 2014 at 9:21pm

Science
Both carbon dioxide and water are pure substances. How are they similar to each other? A.) both substances have a set ratio of atoms that cannot be separated by physical means. B.) both substances have a set ratio of atoms that can be separated by physical means. C.) both ...
Tuesday, April 15, 2014 at 9:11pm

Science
Ok,Thank you for your help! <:
Tuesday, April 15, 2014 at 8:09pm

Science
Thanks for helping :)
Tuesday, April 15, 2014 at 8:07pm

Science
when the interior of a car absorbs sunlight and warms up.
Tuesday, April 15, 2014 at 8:06pm

Science
The answer is B
Tuesday, April 15, 2014 at 8:06pm

Science
Please somebdy help!! I need t know this question :(
Tuesday, April 15, 2014 at 8:03pm

Science
Which of the following is the best example of transforming electromagnetic energy into thermal energy? A.when trees absorb sunlight for photosynthesis B.when the interior of a car absorbs sunlight and warms up C.when a solar panal absorbs sunlight to make electricity D.when a ...
Tuesday, April 15, 2014 at 7:53pm

science
Thanks for the help
Tuesday, April 15, 2014 at 7:47pm

science
you want traction, not slipping, so increase friction.
Tuesday, April 15, 2014 at 7:46pm

science
Shoe companies imbed unique designs on the bottoms of the sneakers they manufacture.What is the main purpose of the designs on the bottoms of sneakers? A.to increase potential energy B.to decrease friction C.to increase friction D.to decrease potential energy Please Help!!!!!!!
Tuesday, April 15, 2014 at 7:33pm

science
A
Tuesday, April 15, 2014 at 7:25pm

science
the centripetal force from rotating is exactly equal and opposite to gravity: net force is zero.
Tuesday, April 15, 2014 at 6:32pm

science
why does an person in space craft orbiting earth experiance a feeling of weightless?
Tuesday, April 15, 2014 at 6:07pm

science
Momentum = m*V = 20 * 5 = 100 kg-m/s.
Tuesday, April 15, 2014 at 5:52pm

science
angular velocity at all point is 2pi/day linear velocity=angular velocity*radius*cosLatitude
Tuesday, April 15, 2014 at 5:50pm

science
Find the angular and linear velocities of a man due to the rotation of the earth if he standing A) at the equator B) in Muscat(latitude23.5) C) in oslo(latitude60) Take tha radius of the earth as 6380km
Tuesday, April 15, 2014 at 4:43pm

Science!!!!
These are the answers to my Science test that I had no idea how to answer. Thank you so much for answering them and giving my a 7/7! Are you in connexus?
Tuesday, April 15, 2014 at 3:34pm

science
Friction
Tuesday, April 15, 2014 at 1:54pm

science
A car driver accelerates to a speed of 35 mph and then takes her foot off the pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. What causes that?
Tuesday, April 15, 2014 at 11:09am

science
Which of the following determine how long a star remains on the main sequence Answer Are MASS TEMPERATURE BRIGHTNESS ALL ABOVE THANK YOU
Monday, April 14, 2014 at 10:51pm

science
The Hertzsprung-Russell Diagram is a graphical tool that astronomers use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage. So the answer is D
Monday, April 14, 2014 at 10:35pm

science
An H-R diagram? Answer Are Is a map of the position of the stars Graphs stars according to their size and distance List every known star Graphs a sample of stars according to surface temperature and absolute brightness Thank You
Monday, April 14, 2014 at 10:02pm

Science -Check Answers- Please
1.) How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together. ******** C. They cooled and pulled ice together. D. They began to rotate. 3. Which of the following statements about features on the sun is true? A. Prominences...
Monday, April 14, 2014 at 9:00pm

HELP!
btw I took honors biology in 8th grade and this year I'm taking honors earth science. Usually you take honors chem at a sophomore if your an honors student but teachers can recommend you to AP.
Monday, April 14, 2014 at 8:10pm

science
pressure
Monday, April 14, 2014 at 7:22pm

math, science
a vertical shaft 150mm in diameter rotating 100r.p.m resrs on a flat end foot step bearing.the shaft carries a vertical load of 20kN assuming uniform pressure distribution and coefficient equal to 0.05, estimate power lost in friction
Monday, April 14, 2014 at 6:32pm

science
In the formation of the solar system nearly all of the mass of the solar nebula became ? Answer Are Terrestrial planets GAS giant SUN OORT CLOUD THANK YOU
Monday, April 14, 2014 at 1:20pm

Chemistry - Science (Dr. Bob222)
Cr on the left is +6 each so 6*14 = 84+ and on the right is 14*3 = 42+. 84-42 = 42 e xfrd. I on the left is zero. On the right each I is 7+ and 6*7 = 42+. 42-0 = 42e xfd.
Monday, April 14, 2014 at 12:20pm

Science
I got it... wasn't getting the available weight of h2o2
Monday, April 14, 2014 at 8:54am

Science
a bomb of 5 kg explodes into two equal fragments. At what angle, these fragments fly apart?
Monday, April 14, 2014 at 8:54am

Science
I can't get the normality/milliequivalent of kmno4
Monday, April 14, 2014 at 8:50am

Chemistry - Science (Dr. Bob222)
Consider reaction below: 50H3O^+(aq) + 7Cr2O7^2-(aq) +3I_2(aq) --> 6IO_4^-(aq) + 14Cr^3+(aq) + 75H2O (l) How many electrons are transferred in this reaction?
Monday, April 14, 2014 at 6:00am

Science radioactivity
Thanks a ton!!!!!
Monday, April 14, 2014 at 12:42am

Science radioactivity
Alpha and beta particles really are particles in that sense of the word. The alpha particle is a helium nucleus and a beta particle is an electron. A gamma is a ray; i.e., an electromagnetic wave much like a radio or TV wave (but a much shorter wavelength and much higher ...
Monday, April 14, 2014 at 12:32am

Science
How far can you get on this problem? What don't you understand about the next step>
Monday, April 14, 2014 at 12:26am

Science radioactivity
why are alpha and beta radiation referred to as particles while gamma radiation is referred to as rays?
Monday, April 14, 2014 at 12:12am

Science
A 3.4g sample of h2o2 solution containing x% H2O2 by mass requires x ml of a KMnO4 solution for complete oxidation under acidic condition. the molarity of kmno4 solution is: a)1 b)0.5 c)0.4 d)0.2
Sunday, April 13, 2014 at 11:14pm

Chemistry - Science (Dr. Bob222)
Interesting because at 25C H3PO4 is not solid. It freezes about 17 C. mols H3PO4 = 0.4g/molar mass H3PO4 = estimated 0.004 mols NaOH added = M x L = estimated 0.02 You need to clean up the numbers before continuing. ......H3PO4 + 3NaOH ==> Na3PO4 + 3H2O Starting with 0.02 ...
Sunday, April 13, 2014 at 9:06pm

science
Frankly I don't think this is a very good question. Too many ifs in the answers. 1. I don't agree with a flying bird as an answer; however, it the bird were flying at the same speed (reference the ground) as the train and in the same direction, that could be the right ...
Sunday, April 13, 2014 at 8:04pm

Chemistry - Science (Dr. Bob222)
At 25 degree C, a student adds 0.400 g of solid phosphoric acid to a beaker containing 500.0ml of water. After the solid is completely dissolved the student adds 20.0ml of a 0.995M sodium hydroxide. What is the pOH of the solution in the beaker?
Sunday, April 13, 2014 at 8:04pm

SCIENCE!!!!!
dissolves
Sunday, April 13, 2014 at 6:32pm

science
If you were riding on a train, which of the following would look as if it is not moving? the conductor walking by you a building you are passing a flying bird<---- a person sitting next to you Which of the following reference points would allow you to observe the speed of a...
Sunday, April 13, 2014 at 6:06pm

physical science
a ship is 850 m from a vertical cllff the ship sireN IS SOUNDED AN ECHO IS HEARD AFTER 5 SECOND CALCULATE THE SPEED OF THE SOUND FROM THE SIREN OF THE SHIP
Sunday, April 13, 2014 at 4:44pm

Ethics in Criminal Justice
If we eliminate free will completely, we would also be eliminating: A. the possibility of genetic bases for human behavior. B. The value of modern science. C. Moral responsibility. D. Excuses for criminal conduct.
Sunday, April 13, 2014 at 2:39pm

science
Jaco, I worked this for you rour posts down under "chemistry".
Sunday, April 13, 2014 at 1:59pm

science
well, 1 mole = 22.4 L, so you have 1.15/22.4 moles. that should help.
Sunday, April 13, 2014 at 1:54pm

science
The volume of 3.96 g of a gas sample at standard conditions it was found to be 1.15 L.Calculate its molecular mass?
Sunday, April 13, 2014 at 1:49pm

Science
What are your choices?
Sunday, April 13, 2014 at 1:04pm

Science
A homeowner determined that he used 114 gallons of oil every month to heat his home during the winter. This information would be considered part of his _______________________________. Idk this one please help!!!
Sunday, April 13, 2014 at 1:02pm

SCIENCE
nonpoint?
Sunday, April 13, 2014 at 12:57pm

SCIENCE
To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ ...
Sunday, April 13, 2014 at 12:49pm

Science
Choices?
Sunday, April 13, 2014 at 12:25pm

Science
In the ocean, there are areas where there are very few living things. _________________________ is the term that describes when this happens to a natural area.
Sunday, April 13, 2014 at 12:23pm

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