Homework Help: Science

Branches of Science

Recent Homework Questions About Science

Science
A 70kg person dives horizontally from a 200kg boat with a speed of 2 m/s. What is the recoil speed of the boat?
Saturday, February 11, 2012 at 8:06pm

Physical science
Is it possible for an object to have more kinetic energy but less momentum than the other object? Less kinetic energy but more momentum? *i know the answer to both questions is yes, however, i cannot think of examples ??
Saturday, February 11, 2012 at 7:57pm

physical science
A worker pushes horizontally on a large crate with a force of 312 N, and the crate is moved 6.5 m. How much work was done?
Saturday, February 11, 2012 at 6:38pm

science
Name the type of reaction that the equation represents? 2Cu + O2 -------> 2CuO
Saturday, February 11, 2012 at 3:29pm

Science
How do fossils help to correlate layers of rock?
Saturday, February 11, 2012 at 10:56am

science
in the first second of its flight, a rocket ejects 1/60 of its mass with a velocity of 2400 m/s the acceleration of the rocket is
Saturday, February 11, 2012 at 10:47am

science
what is the nature of solute particles in electrolyte solution?
Saturday, February 11, 2012 at 2:14am

science
If the magnitude of the electric field in air exceeds roughly 3 X10^6 N/C, the air breaks down and a spark forms. For a two-disk capacitor of radius 52 cm with a gap of 1 mm, what is the maximum charge (plus and minus) that can be placed on the disks without a spark forming (...
Saturday, February 11, 2012 at 12:39am

Science
A block of metal weighing 2kg is resting on a frictionless plane. It is struck by a jet releasing water at the rate of 1kg/s and at a speed of 5m/s. Find the initial acceleration of the block.
Friday, February 10, 2012 at 1:02pm

Science
During a football match, the ball shot towards the goal struck the defender's foot at the speed of 10m/s and it bounced back at 20m/s. If the time of impact was 0.2 sec, and mass of the ball 0.5 kg,then find the average force exerted by defender on the ball.
Friday, February 10, 2012 at 12:56pm

Science
In a rocket, fuel burns at the rate of 1kg/s. This fuel is Ejected from the rocket with a velocity of 60km/s. What force will be exerted on the rocket?
Friday, February 10, 2012 at 12:49pm

Science
According to Peter Saundry, there is no true universal code of ethics because standards of conduct vary from place-to-place and time-to-time
Friday, February 10, 2012 at 8:23am

English
Writeacher, I wanted to thank you for all what you have done for me and for my professional growth. We have worked really hard on the project over the last few days (though I was in bed with flu!) By the way, I used your suggestion as a title for the whole project. If the ...
Friday, February 10, 2012 at 4:26am

science
A microwave oven has a power requirement of 1264 W. A frozen dinner requires 5.5 min to heat on full power.
Thursday, February 9, 2012 at 10:18pm

6th grade science
which particles cannot pass through the cell membrane?
Thursday, February 9, 2012 at 9:24pm

science
this is a tough question and I don't get it. It says: What factor causes the difference between weight and mass?
Thursday, February 9, 2012 at 7:24pm

English
Wrieacher, after so many efforts my partners decided to change the title of the project (instead of focusing only on biodiversity they used the sentence: Comparative studies on local biodiversity related to water and learning from each other. I think it's too generic. As ...
Thursday, February 9, 2012 at 4:37pm

English
One last thing. I varied this sentence since we are going to involve students from different third classes.I don't know how to express the second part. Pupils taken from different (or various) tenth classes will be involved in the project since the scientific project's...
Thursday, February 9, 2012 at 1:42pm

math
I need help with my science project and I am dealing with the heart
Thursday, February 9, 2012 at 12:52pm

English
I left out a brief description of the two partners. Feel free to make the appropriate changed. We need the project to be approved! 1) Lycée ... is a general sencondary high school with 920 pupils, which is situated in south Vendée, the least economically ...
Thursday, February 9, 2012 at 11:16am

science
How could you use the shadow of a lamp post to track the time of day on a sunny day
Thursday, February 9, 2012 at 10:43am

earth space science
Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-sixteenth the original amount of parent isotope?
Thursday, February 9, 2012 at 9:53am

English
Here is the part on evaluation + presentation of the German school. Thank you. 1) Presentation of ….. Gymnasium Limes Gymnasium is for the first time involved in a COMENIUS-Project. This project might open the school and its community to a deeper European engagement. 2) ...
Thursday, February 9, 2012 at 8:43am

English
The original sentence for 1) was: 1) The preparatory meeting made clear that the idea to make a project is a result of the desire to become a more European school as well as to get to know how those things are approached in other European countries and to form networks. Second...
Thursday, February 9, 2012 at 7:59am

engineering science
a boat can sail at 27 m.s in still water. the boat must cross a river that flows at 9 m.s towards the east . if the boat crosses the river by going up stream at an angle of 23 south, what will the size and angle of the resulting velocity be?
Thursday, February 9, 2012 at 7:25am

physical Science
What was the average speed in km/h of a car that travels 400km in 4-5h?
Thursday, February 9, 2012 at 7:24am

English
Writeacher, thank you very much! Here are some sentences I varied and I urgently need you to check. I need to clarify those things. Could you please help me express sentence 1? We need to impress the EU to support the project!!! Rationale 1)The preparatory meeting made clear ...
Thursday, February 9, 2012 at 4:09am

science
This graph represents the relationship of the pressure and volume of a given mass of a gas at constant temperature. When the pressure equals 8 millimeters of mercury (mmHg), what is the volume, in milliliters (mL)?
Wednesday, February 8, 2012 at 10:21pm

SCIENCE. I NEED HELPP
How do trees change the environment, making it less favorable for grass to grow?
Wednesday, February 8, 2012 at 9:58pm

Science
A change of the DNA in an organism that results in a new trait is known as? Mutation A group of dog offspring is known as Litter
Wednesday, February 8, 2012 at 9:58pm

Science
What is the first element on the periodic table? Hydrogen?
Wednesday, February 8, 2012 at 9:50pm

English
The first sentences of the last paragraph and then we have finished! Thank you very much !!!!!! 1) The preparatory meeting made clear that the idea to make a project is a result of the desire to become a more Europeen school as well as to get to know how those things are ...
Wednesday, February 8, 2012 at 7:50pm

English
Here is my last paragraph for you to check. I left out the most important part, which we need to vary, bearing in mind that English must be the lingua franca. Do you think we should include "helping the pupils overcome their inhibitions" among the linguistic ...
Wednesday, February 8, 2012 at 7:48pm

Science/Math/HElP
Science- A 25N object is 3 meters up. How much potential energy does it have? our teacher said that the formula for finding out potential energy is PE = Mass * Gravity * Height. The gravity on Earth is always 9.8, but my problem is that instead of mass the object is measured ...
Wednesday, February 8, 2012 at 7:01pm

Science
I need help writhing an Essay about Energy! I have to includ at least 9 of these words listed below ; - heat energy - energy transfer -molecules -motion -traveled -data -centimeters -minutes -observations -colder -warmer -conduction PLLLLLLEEEEEEAAAAAAAASSSSSSEEE HELP!!! (:
Wednesday, February 8, 2012 at 6:38pm

life science
true or false? The temperature varies greatly throughout the year in a tropical rain forest.
Wednesday, February 8, 2012 at 5:52pm

English
Here are the integrations into ongoing activities which refer to the two other schools. Thank you very much! 1) The project, its cycle and the outcomes will be integrated as followed: .......Gymnasium: The 10th class will be involved in project because the project subject is ...
Wednesday, February 8, 2012 at 4:00pm

English
Here is the part concerning the distribution of tasks among the partner schools. 1)..... Gymnasium: It will coordinate the project and accomodate partners twice (beginning and end). It will as well set up the e-twinning platform and organise presentations, press conferences ...
Wednesday, February 8, 2012 at 12:26pm

English
When presenting the school we missed an an important detail I need you to check: 1) Among the experiences realized in cooperation with the Politecnico of Turin (It is a well-known Applied Science Faculty in Turin. I would like to leave the name in Italian. What do you think?) ...
Wednesday, February 8, 2012 at 11:52am

English
Thank you very, very much indeed! Here is the second part, concerning the scientific and linguistic objectives. The question is: " What are the concrete objectives of the partnership"? 1)Scientific objectives - describing the biodiversity, the presence of ...
Wednesday, February 8, 2012 at 10:22am

science
How do direct and alternating current differ?
Wednesday, February 8, 2012 at 3:26am

English
I urgently need you to check these sentences. Thank you very much! 1) I'be been really disappointed to read that our German partner doesn't want your school to join in. Actually, we won't be probably part of the partnership, too. 2) Though English is regarded as ...
Wednesday, February 8, 2012 at 3:22am

Science
a ball is thrown upward at a speed of 12 m/s. It will reach the top of its path in about: a) 0.6 sec b) 1.2 sec c) 1.8 sec d) 2.4 sec Please explain how you find the answer!!! I cannot figure it out
Tuesday, February 7, 2012 at 8:25pm

Science
What is concluded about one of Mendel's short pea plants? A.It had one dominant and one recessive gene B.It had a pair of recessive genes C.It had a pair of dominant genes D.It had no recessive genes B?
Tuesday, February 7, 2012 at 5:33pm

science please help me fast
the stomach uses two kinds of tissue to carry out diffusion. true or false
Tuesday, February 7, 2012 at 5:27pm

Science
What can you conclude about Gregor Mendel? A. The Catholic Church forced him to stop his experiments B. He was one of the first researchers to establish how heredity worked C. He concluded that heredity worked for people as well as plants D. He established all the principles ...
Tuesday, February 7, 2012 at 4:57pm

7th grade science
what is the gravitational potential energy of a 0.1 kg apple sitting on a 12.5 m flagpole?
Tuesday, February 7, 2012 at 4:53pm

Science
What is concluded about one of Mendel's short pea plants? A. It has one dominant and one recessive gene B. It has a pair of recessive genes C. It has a pair of dominant genes D. It has no recessive genes A?
Tuesday, February 7, 2012 at 4:31pm

Science
Which of the following is inherited? A. The shape of your blood cells B. Your intelligence C. Your personality D. Your weight A?
Tuesday, February 7, 2012 at 4:24pm

6th grade science
how do carrier proteins recognize substances to transport in active transport?
Tuesday, February 7, 2012 at 4:17pm

science
Danny sails a boat downstream. The wind pushes the boat along at 21 km/hr. The current runs downstream at 15 km/hr. What is the actual velocity of the boat
Tuesday, February 7, 2012 at 4:15pm

English
I just wanted to add a few more things. I urgently need to express them. 1) We keep emailing each other (two people involved) in English because we both agreed to use English as the lingua franca. 2) Therefore, we must vary the application module; otherwise, both our students ...
Tuesday, February 7, 2012 at 3:40pm

general science
a train goes forward at a speed of 1 m/s for 20 seconds. then it stops and goes backward at a speed of 0.5 m/s for 4 seconds. after both movements are completed, how far is the train located from its starting point.
Tuesday, February 7, 2012 at 1:51pm

English
I urgenlty need you to check these sentences, too. I need to be extremely convincing but also determined. 1) We also agreed to use English as lingua franca during the preliminary meeting we held at our school with our school principals. 2) On that occasion we established that ...
Tuesday, February 7, 2012 at 1:45pm

elements of design
1. Study the following sentence, then select the answer that best describes it. THE COW JUMPS OVER THE MOON! A. Italic serifed type B. Bold roman sans serif type C. Bold italic sans serif type(my answer) D. Bold roman serifed type 2. Which one of the following statements about...
Tuesday, February 7, 2012 at 1:37pm

phyhsical science
how much time is needed for a car to accelerate from 6.5 m/s to a speed of 22 m/s if the acceleration is 3.0 m/s/s?
Tuesday, February 7, 2012 at 1:14pm

Science
Hi , I am doing a written science assessment on burning magnesium metal - one of the questions we had to answer was:explain the reaction using the big idea of energy . Would you have any clue what that means ? Thanks x
Tuesday, February 7, 2012 at 12:21pm

English
I urgently need you to check these sentences. 1) Our German partner wrote that students can communicate in one of the European languages of their partners. I'm really disappointed by his words and I need to reply to this. 2) Among the linguistic objectives you included: - ...
Tuesday, February 7, 2012 at 11:46am

English
Thank you very, very much for helping me! I still have to mention a few things to connect the description of the school to the need of promoting the study of English and IT. I hope you can help me express them. 1) I also wanted to say that students from the applied sciences ...
Tuesday, February 7, 2012 at 5:06am

science
How is temperature related to the average kinetic energy of molecules that make up a substance?
Tuesday, February 7, 2012 at 3:22am

science
What do scientists mean when they say that action equals reaction?
Tuesday, February 7, 2012 at 3:14am

science
What is the effect of increasing the temperature of a body?
Tuesday, February 7, 2012 at 2:53am

math
Of the first graders who were asked, one sixth like math best, two thirds like reading best, and 12 like science best. How many first graders were asked their favorite subject? Please provide a "Draw a Picture" strategy to solve the problem.
Monday, February 6, 2012 at 11:08pm

Science
What environmental niche is most suitable for an animal that eats fruit? A.artic tundra B.temperate swamp C.temperate plains D.tropical forest D? Which of these is NOT an adaptation for the Fennec Fox? A.beige coat to camoflauge B.small ears to prevent heat loss C.hunting ...
Monday, February 6, 2012 at 8:21pm

English
Here is the second part of the school description I need to translate. Some words are unclear and the sentences are too wordy. I need your help to improve them. 1) third branch includes the study of two foreign languages: English and French and addresses to all those who wish ...
Monday, February 6, 2012 at 8:09pm

science
In 91% (by volume) isopropyl alcohol (a large [compared to water], flammable molecule) solution, there are only two substances: the alcohol, and water. So when I poured 50 mL of 91% isopropyl alcohol into a graduated cylinder, how many milliliters were alcohol? How many were ...
Monday, February 6, 2012 at 6:23pm

Science 7R - HW Check (PLZ read!)
Compare Lamarck's explantion of evolution with Darwin's theory. My Answer - After scientist collected large amounts of data on the inheritance of characteristics, Lamarck's explanation was rejected. Darwin's developed the theory of evolution still accepted ...
Monday, February 6, 2012 at 5:37pm

6th grade science
at the end of cytokinesis, how many chromatids will be found in each daughter cell? explain.
Monday, February 6, 2012 at 5:13pm

Science
Which of these structural adaptations would most help a nocturnal animal living in the forest? A.smaller eyes B.longer hind legs C.darker fur D.wings C? Which of these changes would most help a plant living in a desert? A.more leaves B.more roots C.smaller stem D.smaller ...
Monday, February 6, 2012 at 4:43pm

English
Writeacher, thank you very much for all your explanations!! I think the part of the integration of the project into the students' curriculum should be improved. This is what I translated. I think certain points should be omitted. I also wanted to add a new point. 1) ...
Monday, February 6, 2012 at 1:10pm

materials science
A bar of pure nickel is coupled with a bar of pure iron (interfaced). The diffusion couple is then heated to a temperature of 1000°C. (a) How long will it take for the concentration of nickel to reach 0.1 wt%, 1.0 μm below the interface? (b) How long will it take for ...
Monday, February 6, 2012 at 12:21pm

science/math
A juice processing operation uses steam to heat the fruit juice up to a temperature of 96̊C prior to packaging it in drink boxes. They need to heat 3,250 kg of apple juice (10.5% solids) from an initial storage temperature of 39̊F to its heat treatment temperature. ...
Monday, February 6, 2012 at 12:57am

Science
Helium gas is added to a ballon already partially filled with helium gas the balloon inflated because the
Sunday, February 5, 2012 at 9:34pm

6th grade science
during which phase is DNA duplicated?
Sunday, February 5, 2012 at 9:32pm

6th grade science
what are the four phases of mitosis??? -------,-------,-------,-------
Sunday, February 5, 2012 at 9:27pm

Science
Which of the following statements describes the most serious , long term , environmental damage produced by oil spills in the ocean ?
Sunday, February 5, 2012 at 8:29pm

science
Can you help me please? List at least three ways in which insects can help humans? 1. Bees can help by the honey they make. it can be used by humans in many ways. 2. They help the ecology by being producers, consumers and decomposers in the food chain. 3. Insects can be an ...
Sunday, February 5, 2012 at 7:38pm

computer science
Use the Library and other resources to write a "work-from-home" policy manual for an insurance company, educational institution, or another organization concerned about protecting an individual's privacy. Your manual should include policies to cover remote access...
Sunday, February 5, 2012 at 7:30pm

science/physics
A 230kg ball moving at velocity of 25m/s collides with a 420 kg ball that is not moving. What is the final velocity after contact
Sunday, February 5, 2012 at 4:35pm

English
Thank you very much! As to the linguistic objectives, I included a few more things but I don't know if the logical sequence is correct (I think some points could be omitted). As you are also an English teacher, I really hope you can help me organize the linguistic ...
Sunday, February 5, 2012 at 4:10pm

science
Can you help me with these question(s) please??? What substance does a cell use to power active transport? Describe the movement of material during diffusion. Describe the movement of material during active transport. I would appreciate any help whatsoever. Thank you. kathy
Sunday, February 5, 2012 at 12:14pm

science
Which wave property can best explain the apparent bending of a pencil when its dipped in to a glass of water?
Sunday, February 5, 2012 at 9:49am

science
Which wave property can best explain the apparent bending of a pencil when its dipped in to a glass of water?
Sunday, February 5, 2012 at 9:47am

science (physics)
five examples of potential energy with diagram
Sunday, February 5, 2012 at 8:31am

science
what is ways of changing the direction of moving billard ball.
Sunday, February 5, 2012 at 6:28am

science
An object is dropped off of a 27 meter tall building. How long is it in the air before it hits the ground? To measure the height of a tree, a person throws a ball vertically upward, and takes 13 seconds to reach its maximum height which is exactly the height of the tree. How ...
Sunday, February 5, 2012 at 12:11am

science
A race car travels northward on a straight, level track at a constant speed, traveling 0.777 km in 16.6 sec. The return trip over the same track is made in 21.7 sec. What is the average velocity of the car for the FIRST leg of the trip? What is the average velocity of the car ...
Sunday, February 5, 2012 at 12:06am

science
A space probe of the surface of Mars sends a radio signal back to the Earth, a distance of 3 x 1010 km. Radio waves travel at the speed of light (3.00 x 108 m/s). How far away is the space probe? How many seconds does it take for the signal to reach the Earth? How many hours ...
Saturday, February 4, 2012 at 11:40pm

science
why explore volcanoes?
Saturday, February 4, 2012 at 9:21pm

science
A jogger jogs around a circular track with a diameter of 330 meters in 31 minutes. What was the runner's average speed? What was the runner's average velocity
Saturday, February 4, 2012 at 8:12pm

FACS - Pen Pal Letter Project HELP!!!
Name ________ Period 5 FACS - (teacher's name) (Space down 5 lines) *Tab 5 across for HEADING/ADDRESS & DATE (what does this means?) (Space down 2 times after date) GREETING (Space down 2 times after greetings THIS IS THE INFO. FOR FRIENDLY LETTER/PEN PAL LETTER - Margins...
Saturday, February 4, 2012 at 6:05pm

science- cell structure
An inner and an outer membrane are characteristic of which organelle? my answer: Mitochondria and chloroplasts What is the nucleus? my answer- nucleus is a cell structure that contains hereditary information What is the nucleiod? my answer: the nucleiod is like the nucleus. ...
Saturday, February 4, 2012 at 5:24pm

science
an areroplane flies to the destination 600km west of its starting point. A wind is blowing from the North-west at 75 m/s. The pilot wants to complete the flight in 55 minutes. Calculate the direction to be taken by the pilot.
Saturday, February 4, 2012 at 2:22pm

science
While rearranging a dorm room, a student does 288 J of work in moving a desk 2.2 m. What was the magnitude of the applied horizontal force?
Saturday, February 4, 2012 at 2:07pm

science
What is the kinetic energy of a 23 kg dog that is running at a speed of 7.4 m/s (about 17 mi/h)?
Saturday, February 4, 2012 at 2:06pm

science
How much work is required to lift a 3.3-kg concrete block to a height of 1.2 m?
Saturday, February 4, 2012 at 2:06pm

science
A 5.8 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.57 m above the counter?
Saturday, February 4, 2012 at 2:05pm

Science
Why do seas provide habitats with minimum temperature variation? How does turbulence of water influences the availability of gases? I read that jellyfish have form in water but collapses into a mass when placed on land, why is that? Its not really Homework i just read it from ...
Saturday, February 4, 2012 at 4:33am

English
Writeacher, I'll follow your advice. Can you check if everything is OK? 1) As I told you last Saturday, I asked my school's science teachers several times to prepare part D but they didn’t. 2) During the preliminary meeting they haven’t helped us at all ...
Friday, February 3, 2012 at 1:56pm

science
what is formed when an underwater mountain reaches the oceans surface
Friday, February 3, 2012 at 12:21pm

Science/English
I really need a science teacher to check point 1 and tell me if the rest is possible. Thank you very much! 1) Task organization and information distribution The various tasks will be divided among participating students according to the logical breakdown of looking at the ...
Friday, February 3, 2012 at 3:14am

Earth Science
Can you help me find how many hours are received by these degrees of latitude during the winter (see details)? North Pole = 0 hrs of daylight Equator = 12 hrs of daylight South Pole = 24 hrs of daylight 66.5 degrees north = ? 23.5 degrees north = ? 23.5 degrees south = ? 66.5 ...
Thursday, February 2, 2012 at 10:43pm

Science 7R - HW Qs. Check (PLZ read!)
What is the difference between aerobic and anaerobic organisms? My Answer: Aerobic requires oxygen, anaerobic doesn't. Is my answer to this question is correct. Please reply this post! Thank You!
Thursday, February 2, 2012 at 8:20pm

Science
Bobpursely, thank you for helping me! Our project involving three schools is about biodiversity in water. In particular, participating students will have to carry out a chemical and microbiological analyses of water in each school's local area : river water for us and the ...
Thursday, February 2, 2012 at 6:13pm

science
The pull of gravity keeps the Moon in orbit around Earth. The distance between the Earth and Moon is about 380,000 kilometers. A crew of astronauts leaves Earth on a Monday and lands on the Moon on a Thursday. They land on the side of the Moon facing away from the Earth. On ...
Thursday, February 2, 2012 at 6:05pm

English 7 - Journal Entry Check
English Homework: Journal Entry Due Tomorrow Topic - Dicuss a time when you made a decison to do something (Determination), and perservered as a result. Please check my journal entry to see if it's good. Determination When I first came in the 7th grade at (school name), I ...
Thursday, February 2, 2012 at 5:38pm

science
Objects in motion are the result of _____ forces.
Thursday, February 2, 2012 at 5:33pm

science
Stationary objects are the result of ____ forces.
Thursday, February 2, 2012 at 5:31pm

Science
Writeacher, can you ask a science teacher to help me with my application? (methods adopted when analyzing experiment data concerning biodiversity in water) I would be extremely grateful to you. Approach 1) Task organization and information distribution The various tasks will ...
Thursday, February 2, 2012 at 11:20am

English/Science
I really need your help to determine if the following techniques are possible when analyzing scientific data (biodiversity in water) with pupils. I think an English science teacher can help me determine the techniques. Approach 1) Task organization and information distribution...
Thursday, February 2, 2012 at 10:09am

Science
A 2400-pound car exerts its maximum force of 750 pounds. What will be its minimum time needed to slow it down from 50 m/s to 10 m/s? Determine how far will the car travel in that time.
Thursday, February 2, 2012 at 8:42am

computer science
You work for a company that requires you to compute the average temperature for 8 A.M. to 6 P.PM. each day. You are to computer program to compute the average temperature.
Thursday, February 2, 2012 at 6:05am

science
what is the massof fresh water(p=1.00g/cm^3) in a 72.8L tank?
Thursday, February 2, 2012 at 12:31am

science
what is co2 ..can anybody remind me because i forget.
Wednesday, February 1, 2012 at 10:13pm

science
what technologies or what do explorers need to survive a volcano underwater and space?
Wednesday, February 1, 2012 at 10:10pm

Science
A 95 kg tennis player hits a 0.5 kg tennis ball with a force of 150 N What force does the ball exert on the raquet?
Wednesday, February 1, 2012 at 7:58pm

Science
Which of the following is an example of an inherited trait? A. Migration in geese B. Hunting behavior of tigers C. A child riding a horse D. A dolphin jumping through a hoop A? An orangutan is trying to catch a fish with a long pointed tool. Which of the following describes ...
Wednesday, February 1, 2012 at 6:26pm

Science
Which of the following describes a learned behavior? A. A cat nursing its kittens B. A parrot singing words to a song C. A mocking bird building a nest D. A zebra's black and white stripes. B?
Wednesday, February 1, 2012 at 5:26pm

science
if the distance between crest were 1.5 meters apart, and 2 crest pass the pole each second, what would be the speed of the wave ?
Wednesday, February 1, 2012 at 3:18pm

English
Here is the second part of the project I urgently need to prepare on biodiversity. Please, I don't know what else to include. What impact do you expect partnership activities to have on persons and on the participating institutions? 1) The project will develop ...
Wednesday, February 1, 2012 at 2:33pm

Physical Science
The string of a certain yo-yo is 80 cm long and will break when the force on it is 10 N. What is the highest speed the 200 g yo-yo can have when it is being whirled in a circle? Ignore the gravitational pull of the earth on the yo-yo.
Wednesday, February 1, 2012 at 1:22pm

Physical Science
A man has a mass of 70 kg. A) What would his weight be on Jupiter which as an acceleration of gravity of 25m/s^2? B) What would the mass of a person have to be in order for him to weigh that amount on earth?
Wednesday, February 1, 2012 at 1:20pm

Physical Science
A force of 20 Newtons gives a brick an acceleration of 5 m/s^2. What is the mass of the brick?
Wednesday, February 1, 2012 at 1:20pm

Physical Science
A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds
Wednesday, February 1, 2012 at 1:19pm

English
Could you please check the following sentences, please? 1) Our teachers haven't helped us at all to establish the objectives or the possible results of our project. 2) That's why I believe we should consider the possibility of including Finland in our partnership. 3) ...
Wednesday, February 1, 2012 at 9:00am

science
A thermally insulated 50 ohm resistor carries a current of 1 A for 1 s. The initial temperature of the resistor is 10 degree Celsius, its mass is 5 g, its specific heat capacity is 850. What is the change in entropy of the resistor?
Wednesday, February 1, 2012 at 12:10am

Pleaseeeee help! on science
Can you explain a watch and a to me on tornados
Tuesday, January 31, 2012 at 10:05pm

Science
Can you tell me one time a tornado actually took place in the world and which tornado was it?
Tuesday, January 31, 2012 at 10:02pm

Science
I do not need a link, just a straight up answer please. What are 3 saftey tips you can give me for 'Tornadoes'?
Tuesday, January 31, 2012 at 10:01pm

science
Imagine that you are the scientist who discovered cells. If you were to give a speech to a group of fellow scientists, what key points would you include that describe your accomplishments? What are some that would help?
Tuesday, January 31, 2012 at 9:32pm

Science
What are emotional changes boys and girls experience during puberty?
Tuesday, January 31, 2012 at 7:54pm

science
How much work is done by an applied force that moves two charges of +7.8 µC that are initially very far apart to a distance of 3.8 cm apart
Tuesday, January 31, 2012 at 7:06pm

science
Runner A is initially 5.0 km west of a flagpole and is running with a constant velocity of 4.5 km/h due east. Runner B is initially 7.0 km east of the flagpole and is running with a constant velocity of 6.5 km/h due west. How far are the runners from the flagpole when their ...
Tuesday, January 31, 2012 at 6:55pm

science
I have a test tomorrow and i need to be able to say what type of bacteria something is in their agar colonies. I am having a hard time diffirentiating between bacillus cereus and bacillus subtilis. does anyone have any good websites that would help? or know any tricks?
Tuesday, January 31, 2012 at 5:53pm

science
if a globe has a diameter of 0.5 meters write the globes scale as a ratio. What distance on earth would 1 centimeter on a globe represent
Tuesday, January 31, 2012 at 4:31pm

Physical Science
A force of 20 Newtons gives a brick an acceleration of 5 m/s^2. What is the mass of the brick?
Tuesday, January 31, 2012 at 4:30pm

Physical Science
A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6m/s, how much force is needed to bring it to a stop in 4 seconds.
Tuesday, January 31, 2012 at 4:25pm

physics science
Please can you help as I am stuck, Describe ib detail, how you would carry out an investigation to measure the density of a block of aluminium? Thankyou
Tuesday, January 31, 2012 at 12:04pm

engineering science
If a person has a mass of 83 kg, what will that person weigh in newton
Tuesday, January 31, 2012 at 11:57am

engineering science
A 250 cc motorbike must accelerate from rest to 126 km/h in 150 m in 10 seconds. Draw a velocity/time graph of the movement. (Hint: change km/h to m/s
Tuesday, January 31, 2012 at 11:51am

English
I left out the following sentences. Thank you very much for helping me. 1) As for our Comenius project on biodiversity in water, I'm attaching a copy of the European module the coordinating school has to fill in by 21 February. 2) Do you think you could help the German ...
Tuesday, January 31, 2012 at 9:22am

English
Could you please check the following sentences, please? Thank you. 1)I'm still waiting to receive an answer from the principal of the German school to see if they are willing to accept your school in our Comenius partership. 2) In any case, our science teachers are really ...
Tuesday, January 31, 2012 at 9:21am

Science
Examples of seed dispersal Animals carry seeds away carried by the wind animal waste carried by water stuck to fur/clothes Any others?
Monday, January 30, 2012 at 9:30pm

Science
On the movie, Bill Nye the Science Guy, what was the seventh energy after thermal, elctrical, nuclear, sound, solar, and chemical?
Monday, January 30, 2012 at 7:24pm

materials science
Consider a copper lattice with an excessive average of one vacancy in every 100 unit cells. What will be its density? Compare this to the theoretical density of copper.
Monday, January 30, 2012 at 7:23pm

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