Science

Recent Questions

7th Grade Science
Hi, I really need help with this. I'm supposed to find information about biodiversity and fishing or housing and answer these two questions: "What challenges does [your topic] pose to biodiversity? What do you think should be done and why?" The websites my school gave me are ...

Science
Two teams are pulling on a rope. Team 1 pulls with a force of 124 newtons, while team 2 pulls with a force of 110 Newton in the opposite direction which of the following correctly describes the motion that will result A. Team 1 will move, team 2 will not B. Team 2 will move, ...

Science
Please Check! 1. How does nanotechnology help engineers make products for the future? a. By changing a materials atomic structure, it can be made from elements that are easier to obtain.*** b. By changing a material's atomic structure, its physical properties can also be ...

Science Please Check
Please Check 1. How does nanotechnology help engineers make products for the future? a. By changing a materials atomic structure, it can be made from elements that are easier to obtain.*** b. By changing a material's atomic structure, its physical properties can also be ...

Science
is there a chart available that show the vapor pressure of Isopropyl alcohol and water solutions at 68 degrees F ?

science
Briefly describe how you would prepare 500cm of 1mole of NaCl solution in the laboratory.(Na-23,Cl-35.5)

Science
What is a real-world example for biochemical conversion?

science
four ways humans use natural resources

SCIENCE NOW
name two hormones produced by the ovaries and explain what they do?

science
during which phase can fertilization occur A. phase 1 B. phase 2 C. phase 3 D. any of the phases *******? more info phase 1 is between 1-7 phase 2 is between 7-14 phase 3 is between 14-28

Science
How does sea-floor spreading occur? A, New materials are being added to the asthenosphere. B, Earthquakes break apart the ocean floor. C, Sediments accumulate at the area of spreading. D, Molten material beneath Earth's crust rises to the surface. •• 2, Which features form...

Science
Which of the following shows fossils as evidence of continental drift? A. Limestone layers in the Appalachian Mountains of North America were exactly the same as the limestone in Scotland's highlands B. Mesosaursus, an ancient reptile, had been discovered in South America and...

Science
ing to Wegener's hypothesis of continental drift,? A.Earth's surface is made up of seven major landmasses. B.the continents do not move. C.Earth is slowly cooling and shrinking. D.the continents were once joined together in a single landmass.•• Correct me plz

science
You wish to obtain a magnification of -2 from a convex lens of focal length f. The only possible solution is to?

science
the density of an object with a volume of 60.0 mL and a mass of 400.0g is___? a. 0.150g/mL b. 2.89g/mL c. 5.50 g/mL or d. 6.67 g/mL

Science
1. Which climate is warm, wet, and located on the edges of the tropics? A. temperate marine B. highlands C. temperate continental D. polar 2. Which statement best explains why tropical climates are so hot? A. They receive little rain B. They receive more direct sunlight than ...

science
1. Two point charges 4 μC and 2 μC are separated by a distance 1 m in air. At what point on the line joining the two charges is the electric field intensity zero?

science
If the number of loops on an electromagnet increases, the strength of the magnet will?

Earth Science (check answers)
Describe the importance of maintaining the ocean ecosystem. It is important to maintain because the ocean ecosystems because it provides reefs that support a complex ecosystem of ocean organisms that live and help each other to survive. Virtually every phyla on Earth is ...

science(physics)
A 2kg stone is droped from the top of a 20m building a)what potential energy does it posses b)At what height does its potential energy become equal to its kinetic energy? c)what is its kinetic energy just before it hits the ground? d)With what velocity does it reach the ground...

math
In an examination 70 student failled in math¡A90failed in science and 20 failed in both. if 80 student passed in math using venn-daigram¡A find how mamy student were passed in both subject¡H

science
hello! just needing help with this question. Why does milk have to be an emulsion to be considered a complete food?

science
state the type of transformation of energyin a dry cell discharges and in a hydro electric power plant.

science
A 12V battery has 6cells in series. The E.m.f of the battery is 13.8V and the load drawing 10amp is connected to the battery. THe PD is now 12.0V. Calculate the internal resistance per cell of the battery

science physics
A penny is dropped from a window and takes 1.82s to reach the ground. From what height was it dropped.

Science
Sammy and Andy wanted to measure their classroom. Would this work? Why or why not

Science
15)Which of the following shows the correct sequence of what happens to the water molecules in an ice cube when it is removed from the freezer? 1. the molecules gain enough energy to break free from each other. 2. the ice begins to melt 3. the molecules vibrate in a fixed ...

Science
13.)How can substance A and B be compared? Choose all that apply. A.)The particles of substance A have more energy than the particles of substance B.*** B.)The particles of substance A are more tightly held together than the particles of substance B. C.)The particles of ...

Science
Describe the importance of maintaining the ocean ecosystem.

Science
What should I take next year? I am in the 5th grade. I want to know what classes i should take for 6th grade.

Science-The Solar System
What are two major differences in the composition of the inner and outer planets? I know that the inner planets are small, hard, and rocky, and the outer planets are large and gaseous. What is another difference?

Science
Q: Mant people who care about natural resources would choose to use wind power at their homes. however, wind power is not an option for people in many parts in the country. Explain what benefits of wind power are and why is it not available to everyone in the U.S. In your ...

Science
How does the principals of convection, conduction, and radiation explain how the water in the saucepan gets hot?

maths,agricultur;life science,business
identify three courses or study fields you are interestedin following after grd12.write them down in order of preference.provide 2 reasons why you find this a suitable course for each choice

Science
A slab of granite has a mass of 1400.0 grams. The specific heat of granite is 0.040 J/gC. How much heat must be absorbed to raise the granite slab's temperature by 75 degrees C? 11.8 kJ 80.5 kJ 88.2 kJ 19.5 kJ I've tried solving this several times and I never get one of these ...

physical science
Balance of the following equation Ca+O2=CaO

Math literature, Life Science, Geography and Tourism
What job can I do will doing those subjects

U.S. History
I have to do a slide presentation, and just needed some ideas to write about. Students will create a 3-slide presentation on any development in culture, science, and technology from 1914-1945, in America. So can you give me some ideas to write about?

science
acetic acid has a pka of 4.8 how many ml of 0.1M acetic acid and 0.1M sodium acetate are required to prepare 1L of 0.1M buffer with a PH of 5.8? solve

Science
1. Which of the following about the suns structure is true? A.The sun has a solid surface. B. The sun has an interior and an atmosphere. * C.The sun's is similar to Earth's; it has a core, mantle, and crust. D. The sun's outermost layer is called the radiation zone.

Science
Where on the ocean floor will you find the greatest amount of living organisms? Answer: the coral reefs The greatest amount of living organisms can be found in the photic zone where sunlight can penetrate water, and where organisms that photosynthesize depend on sunlight. ...

Science
Where on the ocean floor will you find the greatest amount of living organisms? Answer: the coral reefs The greatest amount of living organisms can be found in the photic zone where sunlight can penetrate water, and where organisms that photosynthesize depend on sunlight. ...

Science
Where on the ocean floor will you find the greatest amount of living organisms? Answer: the coral reefs The greatest amount of living organisms can be found in the photic zone where sunlight can penetrate water, and where organisms that photosynthesize depend on sunlight. ...

Earth science
Where on the ocean floor will you find the greatest amount of living organisms? Answer: the coral reefs

7th Grade Science About Mitosis & Meiosis
Hello, I really need help about mitosis and meiosis. So in my project, it asks me to explain three differences between mitosis and meiosis. I only have one difference and this is what I wrote: Mitosis-A type of cell division in which daughter cells are identical to parent ...

Science: Physics
mr. slott at his fighting weight of 1000N jumps down from a platform meters above a trampoline with a spring constant (k) of 500N/M. How much does Mr.Slott strech the trampoline (x) before it brings him to a stop

science
How are Earth and Venus similar ? How are they different? give 2 similarities and 2 difference thanks

Science, don't leave me hanging plz.
1. Which of the following describes how matter moves between producers, consumers, and decomposers in an ecosystem? A. one-way flow from producers to consumers to decomposers. B. one-way flow from decomposers to consumers to producers. C. cyclic flow from producers to ...

Science
Hi, can someone explain how cell membranes and their components participate in intercellular signaling. Maybe give an example of cell membrane involvement in one particular type of cellular signaling.

Science
Can someone describe the G protein receptor system and the tyrosine-kinase receptor system. I wanna know how these two systems are similar and how these two systems are different in their of structures and functions.

Science
If it requires 23.4 milliliters of 0.65 molar barium hydroxide to neutralize 42.5 milliliters of nitric acid, solve for the molarity of the nitric acid solution. Show all of the work used to solve this problem. Unbalanced equation: Ba(OH)2 + HNO3 -> Ba(NO3)2 + H2O

science
If the density of Hg is 13.53 and 62.5 respectively. How many grams,moles,atoms of Hg do you have?

Science
using the equation c3h5+5o2=3co2+4h2o, calculate the mass of c3h8 that can produce 100g of h2o

Life Science
The process by which cellular material is divided between two new cell. (2 words)

Science
Two equal vectors are working at a point.The resultant is equal to one of those vectors.Prove that the resultant bisects the angle between the vectors.

Health
Which profession should a person who suffers from chronic asthma probably stay away from? A. Criminal attorney <<<<< B. Earth science teacher C. Grocery store manager D. veterinarian.

science
how does the weight placement in a rocket effect the distance

Science Experiment Help (pt 2)
did the experiment (correctly this time), still need help with the answer to this question: What other mixture can be separated by crystallization? thnx for the help!

science
What is density of acetone at 23°C

math
Jorge has prepared his science project on a piece of poster board that has an area represented by the trinomial x2 + 5x – 50. a) What are the dimensions of the board? b) Write an expression for the perimeter of the board. c) What is the actual perimeter of the board if x = ...

English
Social studies is fun/difficult/easy/interesting/exciting.​ Math Is _________. Science is _________. -------------------------------- Other than the adjectives above, what other adjectives can we use for the blank? Can you name suitable adjectives?

science
When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........

science
A balloon filled with 3.5 L of helium at 20 °C and 3 atm. What will be the new pressure if its volume increases to 17.5 L at constant temperature?

science
How can geothermal energy affect the use of fossil fuels?

Science
A car is traveling north at 15 m/s ten minutes later it is traveling at 70 m/s what is the car s initial velocity what is its acceleration

science computer
Write a program to read the names and age of 10 people and print the name of the oldest person.assume that there are no person of the same age.data is supplied in the following form:name,age,name,age

Science Experiment Help
Just need help answering this one question for my science experiment: "Name another mixture that could be separated like the sugar-water mixture." the sugar-water turned into caramel when I heated it... so what other mixtures do that? Thnx for the help! Aly

science
If I mix 300g of reactant A with 100g of reactant B in a close system how much will it weigh

Science
How many Btu's are required to change five pounds of ice at 20°F to water at 160°F? a. 2,608 Btu’s b. 1,390 Btu’s c. 1,304 Btu’s d. 141 Btu’s I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing? Thanks for the help, Chris

SCIENCE
At 500K,1.00mol of ONCl is introduced into 2.50dm3 closed vessel.At equilibrium the ONCl is 6.5%dissoiated.What is the value of the Kc for equilibrium at 500K

computer science
Write a java program that reads from the user the course code, section and the scores of a student for three exams representing two midterms and a final. The percentage of each of the three exams is of fixed value 30, 30 and 40 percent respectively. Your program computes the ...

Science
Volume of 12M HCL taken for preparing 1M HCL (100 ml Sol {

Science
chemical equation for sodium hydrogen carbonate and acetic acid (not balanced)

science
initial condition V1= P1= formula

science
A ball from a height 'h' on a horizontal floor.If it loses 60% of its energy on hitting the floor then height upto which it will rise after first rebounce is?

Science
A ball thrown vertically upward has a speed of 5.0 m/s at a height of 3.0m. The mass of the ball is 1.2 kg. Find its mechanical energy

Science
When an object and screen are separate d by 1m distance. when a convex lens is place d at 30 cm from the object it forms a clear image then the image distance is?

Science ap chem
For which of the following solutions must we consider the ionization of water when calculating the pH or pOH? (a) 3 × 10−8 M HNO3 (b) 0.10 g HCl in 1.0 L of solution (c) 0.00080 g NaOH in 0.50 L of solution (d) 1 × 10−7 M Ca(OH)2 (e) 0.0245 M KNO3

Science
The pH of a 0.10-M solution of caffeine is 11.16. Determine Kb for caffeine from these data: C8H10N4O2(aq)+H2O(l) ⇌ C8H10N4O2H+(aq)+OH−(aq)

Science
2.Why are biologists concerned about ecosystem disruption? 1.Explain the process of succession. Succession is a natural change in the area that results in one group of plants replacing a group before. for #1 that is all I have so if you could give me a website that would be ...

Science
water is a(n) factor in all ecosystems that all living things requires?

Science
1.Explain the process of succession. 2.Describe how changes in an ecosystem can affect organisms that live there. 3.Describe the amount of time needed for ecosystem recovery If anyone would help me that would be great, websites, answers, anything at all.

political science
Before President Obama, when was the last time a Senator successfully ran for President? A.1824 B.1960 C.Obama was the first Senator to ever win D.1910

Science
1.Explain the process of succession. 2.Describe how changes in an ecosystem can affect organisms that live there. 3.Describe the amount of time needed for ecosystem recovery

political science
I have no clue on this one!!!! Bill Clinton's focus on domestic issues, what was NOT part of his "E2M2" campaign? A.Medicare B.Economy C.Education D.Energy

political science
the Presidential Campaign has three phases. What is the second phase? A.General Election B.Declaring Candidacy C.Party Conventions D. Nominating Process

political science
In the "Campaigns and Elections By the Numbers" box, the book lists the number of people that filed to run for President. It says 167 filed as Republicans, 83 filed as Democrats, and 1 filed under the _______ Party. A.Libertarian B.Green C.Jedi D.Vulcan

math and science
1500kg motor car was travelling at 36m\s comes to rest over a distance of 40m.calculate. {a}retardation. {b}an average force that brings the car to rest

Science
What are the main parts of the prefrontal cortex?

Math and science
a rock has a mass of 3000 grams what is the mass in kilograms that's the question we need to know how to be converted or figure this question out in the layman's term

Science
1. Which of the following illustrates mechanical weathering? A.Carbonic acid weathers marble and limestone. B. As plants grow, they produce weak acids that slowly dissolve rock** C. Oxidation causes weathering in rock D. Repeated freezing and thawing in rocks causes weathering...

science
If a sheet of Tarpaulin (350gsm) 5m high 7m wide at a pitch of 45% with wind speed of 60mph what will be the upwards force (lift force)in Kg?

Physical science
What are photons

Science: Chemical Bonds
Two nonmetals from group 16 are likely to form a: triple and ionic bond double and ionic bond triple and covalent bond double and covalent bond I don't get this, could someone please explain?

Science HELP!!!!
1.To study a rock sample, geologists observe the rock's mineral, composition, color, and temperature. true false*** 2.finds a rock with layers and smaller pieces of other rocks embedded in it. the rock is most likely A igneous B sedimentary*** C metamorphic D chemical 3. ...

Science
Copper plate is used as cathode but it cann't be used as anode during electrolysis of water, why?

Science
Copper plate is used as cathode but it isn't used as an anode, why?

Science
What wave property is labeled X? a. Frequency b. amplitude c. wavelength d. wave speed Is it C? Thank you!

science
usefullness of volume in the 21st centuary

Science
what volume will 5.00g of nitrous oxide gas occupy at 50 degree celcius and 4.00L?

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