Wednesday
April 23, 2014

Homework Help: Science

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Recent Science Questions

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Science
Hello. I have this question for my class. We were to mix Na2S2O3 to a a test-tube with Varsol layer on top and an Aqueous layer (of I2/KI) on the bottom. I observed a lighter colour change in both layers. How would I express that as a chemical equation? Also, I added saturated...
Sunday, March 9, 2014 at 5:21pm

integrated science
find the resultant force on a .150kg baseball if gravity is pulling down and it is hit at a 45 degree angle with 50N of force by a baseball bat.
Sunday, March 9, 2014 at 5:19pm

science
An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?
Sunday, March 9, 2014 at 4:51pm

science
A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
Sunday, March 9, 2014 at 4:50pm

Science
V^2 = Vo^2 + 2g*h = 0 + 19.6*3 = 58.8 V = 7.67 m/s. V^2 = Vo^2 + 2g*h = 0 @ max ht. Vo^2 - 19.6*2.2 = 0 Vo^2 = 43.12 Vo = 6.57 m/s. a = (-6.57-7.67)/0.002s = -7120 m/s^2. F = m*a = 0.20 * (-7120) = -1424 N.
Sunday, March 9, 2014 at 4:31pm

science
How does ozone gas to int get into the earth?
Sunday, March 9, 2014 at 3:21pm

Science
At least one nuclear reactor is currently online in each of the 50 U.S. states.
Sunday, March 9, 2014 at 3:10pm

science
An aerosol can contains gases under a pressure of 4.6 atm at 18◦C. If the can is left on a hot sandy beach, the pressure of the gases increases to 4.69 atm. What is the Celsius temperature on the beach
Sunday, March 9, 2014 at 3:09pm

science
What pressure is required to reduce 75 mL of a gas at standard conditions to 11 mL at a temperature of 27 ◦C? what pressure would i use?
Sunday, March 9, 2014 at 3:08pm

science
(P1V1/T1) = (P2V2/T2) Remember T must be in kelvin
Sunday, March 9, 2014 at 2:42pm

science
A gas occupying 43 mL at standard conditions is heated to 29 celsius while the pressure is reduced to 0.84091 atm. What is the new volume occupied by the gas?
Sunday, March 9, 2014 at 2:24pm

science
As seen in the lab frame a rocket A is moving to the right with speed c  and rocket B is moving to the left with speed c  . The pilot of rocket B fires a laser beam. In the B-frame, the laser beam points in the x-y plane and makes and angle =53.13˚...
Sunday, March 9, 2014 at 12:45pm

science
A distant spaceship carrying a red headlight, emitting light with wavelength 600nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200nm. What is the velocity of the spaceship? b) As the space ship ...
Sunday, March 9, 2014 at 12:44pm

physical science
A horizontal force of 10 Newtons acts on a 2 kg block on a level surface.The frictional force between the block and the surface is 3 Newtons.What is the magnitude and the direction of the net force acting on the block?
Sunday, March 9, 2014 at 12:37pm

Science
It is not necessry but in few cases it happens but seldom
Sunday, March 9, 2014 at 1:32am

science
false
Saturday, March 8, 2014 at 10:26pm

science
A decrease in “food miles” will most likely increase the environmental impact of any given food.
Saturday, March 8, 2014 at 10:23pm

Science
My answer is "a" also.
Saturday, March 8, 2014 at 10:04pm

Physical Science
Describe convection in a room heated by a radiator.
Saturday, March 8, 2014 at 3:50pm

Engineering science
A brick with a mass of 6kg is dropped vertically from a certain height.it takes 4,5 seconds for the brick to reach the ground.determine the ff.the height from which the brick is dropped and potential energy of the brick
Saturday, March 8, 2014 at 3:39pm

Physical Science
22. Why does a heat pump need an external source of energy (such as electrical energy)?
Saturday, March 8, 2014 at 2:37pm

Science
It's a start, but I will let you elaborate it.
Saturday, March 8, 2014 at 1:06pm

Science
Probably not.
Saturday, March 8, 2014 at 11:34am

science
You are welcome, good luck !
Saturday, March 8, 2014 at 11:12am

science
Thank you for your help and time.
Saturday, March 8, 2014 at 10:52am

Algebra
On Monday, it took Helen 3 hours to do a page of science homework exercises. The next day she did the same number of exercises in 2 hours. If her average rate on Monday was p exercises per hour, what was her average rate the next day, in terms of p? I know that the answer is 3...
Saturday, March 8, 2014 at 10:38am

science
You are implying that the number of sprouts is proportional to the concentration sprouts = k * c in which case k would be undefined for zero c However I doubt if that sort of relationship exists. the number of sprouts probably does increase with c but levels off at some value ...
Saturday, March 8, 2014 at 10:30am

science
I'm instructed to wrtie a full lab raport for a lab I did a couple of months ago. My aim was to find the most efficient concentration of fertilizer to grow red lentils. I planned to do this by taking the average of the number of lentils sprouted each day for eight days and...
Saturday, March 8, 2014 at 9:18am

Science
Two identical twins marry two identical twins. Will their offspring look the same?
Friday, March 7, 2014 at 11:23pm

physical science
An airplane trvels with a velocity of 200 mi/h in a direction 30 deg. west of north of 1.50 h. How far north and how far west is it from its starting point?
Friday, March 7, 2014 at 8:49pm

Science- help asap plz
You're welcome.
Friday, March 7, 2014 at 6:21pm

Science- help asap plz
Thanks :)
Friday, March 7, 2014 at 6:19pm

Science- help asap plz
http://ed101.bu.edu/StudentDoc/Archives/​ED101sp08/dsimms/Trees%20and%20Plants.ht​ml
Friday, March 7, 2014 at 6:09pm

Science- help asap plz
think about the role that trees play in the water cycle. what are two of the ways in which they are part of the cycle?
Friday, March 7, 2014 at 6:05pm

Science- still waiting
okay
Friday, March 7, 2014 at 5:52pm

Science- still waiting
Ask your teacher why my answers are not acceptable.
Friday, March 7, 2014 at 5:50pm

Science- still waiting
My teacher wants different examples than that.. I don't know what other examples to write
Friday, March 7, 2014 at 5:49pm

Science- still waiting
I'll give you one example of each. solid -- ice cube liquid -- glass of water vapour -- steam Now it's your turn to find one more example of each.
Friday, March 7, 2014 at 5:40pm

Science- still waiting
Give 2 examples for each state of fresh water: a) solid b)liquid c) vapour?
Friday, March 7, 2014 at 5:36pm

Science- HELP Please!
PsyDAG answered this question for you.
Friday, March 7, 2014 at 5:24pm

Science- HELP Please!
provide three statements that demonstrate the importance of units when describing motion.
Friday, March 7, 2014 at 5:08pm

Science
provide three statements that demonstrate the importance of units when describing motion.
Friday, March 7, 2014 at 4:46pm

Science PsyDAG

Friday, March 7, 2014 at 4:46pm

Science
is that the answer?
Friday, March 7, 2014 at 4:45pm

science
Ear defenders work by absorbing sound waves.they absorb sound waves and vibrating particles which head to your ear and the ear defender helps because air resistance then increases and reduces the loudness of the wave at a lower amplitude. The energy is then converted into heat...
Friday, March 7, 2014 at 4:35pm

Science
Travel at miles per hour, feet per second or meters per minute? If you have a value of ten for each, they would be distinctively different.
Friday, March 7, 2014 at 4:34pm

science
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. Different names will not make it speedier either.
Friday, March 7, 2014 at 4:30pm

science
Dominant traits will perpetuate, while recessives may not.
Friday, March 7, 2014 at 4:29pm

Science
provide three statements that demonstrate the importance of units when describing motion.
Friday, March 7, 2014 at 4:17pm

Science
Give 2 examples for each state of fresh water: a) solid b)liquid c) vapour?
Friday, March 7, 2014 at 3:12pm

science
D
Friday, March 7, 2014 at 3:03pm

Science
A ball of mass 200 g is dropped from a height 3 m above the ground onto a hard floor, and rebounds to a height of 2.2 m. If the ball is in contact with the floor for 0.002 s calculate the average force exerted by the floor on the ball
Friday, March 7, 2014 at 2:29pm

science
Ahh -- but the moon does have gravity. http://www.moonconnection.com/moon_gravi​ty.phtml
Friday, March 7, 2014 at 1:26pm

science
why is gravity on earth and not on the moon i need something to help me start it off
Friday, March 7, 2014 at 12:48pm

Language Arts
7) While I was researching skate boards, I found an interesting old newspaper story. 8) In the June 29, 1999 edition of the Mercury, there was an article on skateboarding. 9) Some scientists in San Francisco, California filmed skateboarders in action. 10) As they studied the ...
Friday, March 7, 2014 at 12:46pm

Science
https://www.google.com/search?client=saf​ari&rls=en&q=tiger+quolls+habitat&ie=UTF​-8&oe=UTF-8
Friday, March 7, 2014 at 11:22am

Science
http://en.wikipedia.org/wiki/Tiger_quoll​
Friday, March 7, 2014 at 11:22am

Algebra
You are taking a science course in which there will be four tests, each worth 100 points. You have scores of 94,100, and 92 on the first three tests. You must make a total of 360 in order to get an A. What scores on the last test will give you an A? The solution is {s|s>__...
Friday, March 7, 2014 at 10:36am

science plz help right now!!!!
1 B 2 D 3 c 4 d 5 c 6 b 7 d 8 b
Friday, March 7, 2014 at 8:46am

science
find the empirical formula for a compound that consists of aluminum and chlorine in which the aluminum is 20.2% by mass
Friday, March 7, 2014 at 2:21am

Science
Where are you likely to observe the tiger quolls in there habitat?
Friday, March 7, 2014 at 1:38am

Science
Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the ...
Thursday, March 6, 2014 at 11:41pm

Science
Thanks! :D
Thursday, March 6, 2014 at 9:15pm

Science
A. Halfway between the highest point and the lowest point of a jump
Thursday, March 6, 2014 at 9:14pm

Science
Jill is jumping on a trampoline in her backyard. When will she have both potential and kinetic energy? A. Halfway between the highest point and the lowest point of a jump B. At the highest point of a jump C. At the lowest point of the jump D. Just before she begins a jump
Thursday, March 6, 2014 at 9:13pm

Science
d
Thursday, March 6, 2014 at 8:56pm

science
Most people wouldn't take many showers or wash their clothes very often. Check this water usage chart. http://fi.edu/guide/schutte/howmuch.html​ How would your life change?
Thursday, March 6, 2014 at 7:46pm

Environmental Science
On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time?
Thursday, March 6, 2014 at 7:43pm

science
What would you do if every person were only allowed to use 20 gallons of water per day? How would your life change?
Thursday, March 6, 2014 at 7:42pm

Physical Science
?????????????
Thursday, March 6, 2014 at 7:12pm

Science
In the following diagram, the greem ball changes direction after colliding with the red ball because the red ball has more momentum. True <---- False 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s <---- ...
Thursday, March 6, 2014 at 7:03pm

science... PLEASE HELP!
The problem says "during which stage of the cell cycle does the cell membrane pinch the cell in two?" I said the cytokinesis stage is when the cell membrane pinches the cell in two. Am I correct? If not, please help!
Thursday, March 6, 2014 at 6:24pm

SCIENCE
OMG!!! THANKS DAMON THEY WERE ALL CORRECT!!! THESE ARE ALL TEHE CORRECT ANSWERS...
Thursday, March 6, 2014 at 6:16pm

science
explain how chromosome behaviour during sexual reproduction in animals ensures perpetuation of parental traits in offspring and, at the same time, genetic variation among offspring.
Thursday, March 6, 2014 at 6:08pm

SCIENCE
Hey Damon thanks did u already take this quiz?
Thursday, March 6, 2014 at 6:03pm

science
explain how chromosome behaviour during sexual reproduction in animals ensures perpetuation of parental traits in offspring and, at the same time, genetic variation among offspring.
Thursday, March 6, 2014 at 5:43pm

SCIENCE
1. yes 2. All scientists use meters to measure distance to help eliminate confusion. ---------------------------------- 3. yes 5. yes 6. yes 7. yes 8. yes
Thursday, March 6, 2014 at 5:42pm

Science
Not unless the panel charged a battery in it.
Thursday, March 6, 2014 at 5:15pm

Science
Does a solar powered calculator work when there is no bright light falling on the solar panel? Explain
Thursday, March 6, 2014 at 5:05pm

SCIENCE
1. If the net force on an object is O N, the forces are considered unbalanced. true false <---- 2. Most people in the United States use feet and miles to measure distance in their everyday lives. Why do scientists in the United States use meters to measure distance? Meters ...
Thursday, March 6, 2014 at 4:55pm

Science
mitosis
Thursday, March 6, 2014 at 3:32pm

Reading skills
According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from ...
Thursday, March 6, 2014 at 2:37pm

Science
What is a harmful effect of electrical resistance?
Thursday, March 6, 2014 at 2:20pm

science
chfhfhfhf
Thursday, March 6, 2014 at 1:43pm

Science
the process in which body cells are duplicated in order to grow and repair body tissues is called
Thursday, March 6, 2014 at 12:53pm

8th Grade Science
There is a connection between photosynthesis and cellular respiration. The products from one provide the raw materials for the other. What products of photosynthesis are starting materials for cellular respiration? A. glucose and oxygen B. heat energy and ATP C. carbon dioxide...
Thursday, March 6, 2014 at 12:25pm

Check my answers?--SCIENCE
1. What is true about X-rays and microwaves? a. X-rays have greater speed than microwaves. b. X-rays have greater amplitude than microwaves. c. X-rays have greater frequency than microwaves. d. X-rays have greater wavelength than microwaves. 2. The wavelength of a longitudinal...
Thursday, March 6, 2014 at 12:20pm

Science
Idk
Thursday, March 6, 2014 at 12:02pm

science
thank you!
Thursday, March 6, 2014 at 11:57am

Physical Science
395.5
Thursday, March 6, 2014 at 11:41am

Science
Do you have the whole test?
Thursday, March 6, 2014 at 10:57am

8th-g Science: Need help to check answer!!!
I read the chapter one more time and I'm guessing the answer of Q3 is "D"? (Having mass and taking up space are two characteristics of all matter.)
Thursday, March 6, 2014 at 10:28am

8th-g Science: Need help to check answer!!!
I believe Q1 would be B.
Thursday, March 6, 2014 at 10:03am

8th-g Science: Need help to check answer!!!
I disagree with 3.
Thursday, March 6, 2014 at 10:01am

8th-g Science: Need help to check answer!!!
Since I will have a science test next week based on these questions but my teacher won't check all answer with the class. I don't want to make a mistake and study to an incorrect answers. Do you mind to check the answers for me so that I am able to see if I got it ...
Thursday, March 6, 2014 at 9:51am

Science--Check My Answers?
1. What is true about X-rays and microwaves? a. X-rays have greater speed than microwaves. b. X-rays have greater amplitude than microwaves. c. X-rays have greater frequency than microwaves. d. X-rays have greater wavelength than microwaves. 2. The wavelength of a longitudinal...
Thursday, March 6, 2014 at 8:54am

Science
How was Cerro Torre formed?
Thursday, March 6, 2014 at 7:36am

science
A.
Wednesday, March 5, 2014 at 9:03pm

science
oops forgot to put my answer, I think it is either A or B.
Wednesday, March 5, 2014 at 8:59pm

science
3. Which of the following is an example of inbreeding? A farmer chooses the cows in his or her herd that produce the most milk and breeds only those cows. A farmer chooses the cows in his or her herd that produce the most milk and breeds them with cows that get sick less often...
Wednesday, March 5, 2014 at 8:54pm

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