Sunday
December 11, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

Science
How could the development of a smart grid help protect the environment? a. a smart grid uses only renewable energy sources b. a smart grid burns fossil fuels without producing pollution c. a smart grid connects nonrenewable energy sources, making them renewable d. a smart grid...
Friday, November 18, 2016 by qwerty

ELA
"The Enlightenment and the Scientific Revolution were twin explosions in thinking that made the 17th and 18th centuries one of the most exciting and dynamic eras in European history. People cam to believe the power of human reason apart from the guidance of religion. ...
Friday, November 18, 2016 by Miranda

science
A solution of aqueous ammonia contains 28.0% NH3 by mass. the solution has a density of 0.898g/mL. calculate the volume of this solution required to make 425mLof 0.320M NH3 solution.
Friday, November 18, 2016 by luke

Science
A boy carries 100N to 500m. How much work is done
Thursday, November 17, 2016 by Snehashree.S

Science
How can geologists identify different types of ammonites? A. by the times of fossilization B. by the size of their gills C. by what they ate at the time D. by differences in their shells
Thursday, November 17, 2016 by Macie

Science
Which type of dating do index fossils provide the most help for? A. carbon-14 B. radioactive C. relative D. absolute
Thursday, November 17, 2016 by Kalie

Science, Biology
Can you teach me how should I answer these questions please.. Why the events are significant? First mammals: First primates: First modern humans:
Thursday, November 17, 2016 by Emma

Science
_____ is useful for dating very old rocks because it has a half-life of 1.3 billion years. A. thorium-232 B. potassium-40 C. uranium-235 D. carbon-14 is the answer D?
Thursday, November 17, 2016 by Kalie

Science
What happens to the mass of a sample containing a radioactive element during its half-life? A. The mass decreases by half. B. The amount of mass is doubled. C. Eventually there is no mass at all. D. The mass remains the same.
Thursday, November 17, 2016 by Kalie

Science
What about athlete's foot?
Thursday, November 17, 2016 by Brielle

science
The heaviest naturally occurring element is
Thursday, November 17, 2016 by kailey

science
calculate the number of kilojoule necessary to raise the temperature of 60 gram of aluminium from 35 degree Celsius to 55 degree Celsius.Molar capacity of aluminium is 24 joule per mole per Kelvin?
Thursday, November 17, 2016 by Kausar

SCIENCE
HOW IS A PARENT GENERATION OF A FERN DIFFERENT FRON THE GENERATION THAT COMES BEFORE AND AFTER IT
Wednesday, November 16, 2016 by aNGELO

math, science
what are the difference and similarities between math and science
Wednesday, November 16, 2016 by help

Science
How do structures in living organisms compare with structures of nonliving things such as construction cranes, buildings, ships, airplanes, or bridges?
Wednesday, November 16, 2016 by Janelle

science
Which type of energy would the toy have if you pushed it and held the spring in the toy? F) electrical G) kinetic H) potential of I) thermal? ( there is a spring in the toy) I think it is potential energy since the spring is going down.Right?
Wednesday, November 16, 2016 by alessandra

Science
What parts of the earth did glaciers cover during the ice age.
Wednesday, November 16, 2016 by Anonymous

Science (Stoichiometry with Gasses) (Chemistry)
If 1.00 kg of methane (CH4) is burned completely (in excess O2) and the CO2 produced is collected at 20°C and 1.00 atm, what volume (L) will this CO2 occupy??
Wednesday, November 16, 2016 by Ray

Science
How many electrons are present in 0.01 moles of sulphate ion
Wednesday, November 16, 2016 by Shreya

Science
A car starts from an initial velocity of 10m/s and accelerates at 2.5m/s².how long will it take the car to reach a speed of 40m/s.. How far doea the car travel during this time?
Wednesday, November 16, 2016 by Anonymous

science
5. Suppose a skydiver (mass = 75 kg) is falling toward the Earth. When the skydiver is 100 m above the Earth he is moving at 60 m/s. At this point calculate the skydiver’s…….
Wednesday, November 16, 2016 by jeremiah

Science
A Man Wants To See His Own complete image in the mirror.if,the height of the man is h then calculate the length of the mirror?
Wednesday, November 16, 2016 by Mohd Uvais

science
determine the velocity of the truck if it starts from rest and accelerate at 2m/s² in 3.2s
Wednesday, November 16, 2016 by jeff

science
A body of mass 0.1kg starts to fall freely under gravity from a height of 3m.Calculate its potential and kinetic energy when it is 1m above the groind
Wednesday, November 16, 2016 by Amit

Science
Help pzzzzzz Sound in an empty room can be very loud,with many echoes.Describe three ways to make the room quieter?
Tuesday, November 15, 2016 by Nick

Science
Word that means "flat like a plate "(flat land that Is higher than surrounding land"
Tuesday, November 15, 2016 by Jesse

science
A banana turning brown when exposed to the air is an example of
Tuesday, November 15, 2016 by Emma

Science Ms. sue help
what is the function of a cell wall A) to Protect and support the cell B) to preform different functions in each cell C) to prevent water from passing through the cell D) to prevent oxygen from entering the cell. Help!!!!
Tuesday, November 15, 2016 by valerie

science
an experiment discovered that a particular material was a poor conductor of electricityA. conductor B. insulator C. switch D. resistor
Tuesday, November 15, 2016 by karami

Science
Which of the following may occur during metamorphism? A. The rock becomes less compact. B. Certain minerals may recrystallize. C. Crystals may grow smaller. D. The rock becomes less dense.
Tuesday, November 15, 2016 by Aralyn

HISTORY GOVERNMENT CCA
what characteritics do bureaucracies share? check all that apply Formal rules generalization clearly defined goals chain of command elected staff which of the following is part of the executive branch bureaucracy? the president's cabinet the congressional budget office the...
Tuesday, November 15, 2016 by A.A

SCIENCE
The diagram shows the variation of air pressure from an alarm siren at particular instant. The speed of sound in the air is 340m/s. what is the period of alarm siren.
Tuesday, November 15, 2016 by RITIKA

Science
I am doing an Animal project , I need a picture to show how an animal had bilateral symmetry! I couldn't find any pictures that could actually show that. Can you pleas help me? Thank you
Monday, November 14, 2016 by Melody

Science
When is the end of the world
Monday, November 14, 2016 by Rita

American Government
1) What characteristics do bureaucracies share? Select all that apply. A) formal rules** B) generalized jobs** C) clearly defined goals D) chain of command** E) elected staff 2) Which of the following is part of the executive branch bureaucracy? A) the president's cabinet ...
Monday, November 14, 2016 by Juliet

science
In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2). Zn + 2HCl ? ZnCl2 + H2 Based on the Law of Conservation of Mass, how many grams of ...
Monday, November 14, 2016 by Luc

Science
Calculate the displacement and velocity at time of 0.5secs for a ball thrown straight up with an initial velocity of 15m/s.
Monday, November 14, 2016 by Tobias

Science
Is there a relationship between the dates for first land plants, fish, reptiles, mammals, primates, and humans and the amino acid differences?
Monday, November 14, 2016 by Emma

Physical Science
How much energy is released when 10 gm of steam at 100 degree Celsius turns to ice at 0 degree Celsius
Sunday, November 13, 2016 by Praveen

Science (galaxies and universe)
Studying distant galaxies is described as looking back into the past. What does this mean? (use terms light year, distance, and time in your answer)
Sunday, November 13, 2016 by KINA

Science
Why is the surface of the Moon full of pockmarked craters? a) It has little weathering to erode them. b) Due to meteorites landing on them
Sunday, November 13, 2016 by Chimingbell

Science-please help
What makes the moon rise? a)Alignment of the stars 2) Earth's rotation 3) Moon orbits about the Earth Is the answer (2)?
Sunday, November 13, 2016 by Chimingbell

Science
Why do Hydrogen atoms form only single bonds with other atoms and not double or triple bonds like Carbon atoms?
Sunday, November 13, 2016 by Alice Keign

Science
Why are the water molecule bonds at an angle and not straight like the CO2?
Sunday, November 13, 2016 by Alice Keign

6th grade science PLEASE HELP DOING THIS RIGHT NOW
why are capillaries and not arteries or viens not found in alveoli,nephrones,and villi A.vessels must be small so that very little blood enters these tissues B.vessle must be narrow so that very smal moluculescan reach these tissues C.vessls must be light wieght so that way ...
Sunday, November 13, 2016 by krystina

Science
Electric bulb is Marked 60 watts 120 volt what is the resistance of filament of bulb
Sunday, November 13, 2016 by Sunny

science
a 0.5kgball falls into a heap of sand from a height of 10m above the sand. it comes to rest 2.5m beneath the surface of sand. what is the average force exerted by sand on the ball.
Sunday, November 13, 2016 by Raveen

science
Sodium react with chlorine to form sodium chloride a substance used in all households 1.Household name of sodium chloride
Sunday, November 13, 2016 by sbonga

Science
Can resultant magnitude of two vectors be smaller than the magnitude of either vector?
Saturday, November 12, 2016 by Aashna Chapagain

science
Who is the father of computer?
Saturday, November 12, 2016 by Anonymous

science
what is the animal that can sleep by his backbone in the world?
Saturday, November 12, 2016 by teferi olana

Science
In many country celcius scales are used give reasons
Saturday, November 12, 2016 by Anonymous

Physical Science
A 68.4-g sample of potassium chloride was added to 200.0 g of water at 20 C. Is the solution saturated, unsaturated, or supersaturated?
Saturday, November 12, 2016 by Steve

Physical Science
When iron metal reacts with oxygen, the reaction can form Fe203. The balanced chemical equation I think is right is 4 Fe + 302----2Fe203. So I have 4 moles of iron + 3 moles of oxygen creates 2 moles of iron oxide. I need to find the number of moles of oxygen that are needed ...
Friday, November 11, 2016 by Steve

science..
Define ‘Change in entropy’ and define ‘Clausius inequality’ for irreversible and reversible process. Ple help me
Friday, November 11, 2016 by aboddu

intergrated science
A car traveling at a velocity of 24m/s is accelerated uniformly at a rate of 2m/s^2 for 8 seconds. What is the final velocity?
Friday, November 11, 2016 by Cora Stallins

Science
4. Which of the following statements is true? A. Biodiversity provides additional resources that raise the carrying capacity of an ecosystem B. Biodiversity increases an ecosystems ability to withstand changes C. Biodiversity makes an ecosystem more difficult to destroy D. ...
Friday, November 11, 2016 by Embershy

Science
1. An organism's particular role in its habitat, or when and how it survives, is called its A. Carrying capacity B. Ecosystem C. Competition D. Niche*** 2. Which of the following is an example of a predator adaption? A. A lion's pheromones B. A shark powerful jaws*** C...
Friday, November 11, 2016 by Embershy

Science
If 48 gram solute is present in 500 ml H2O2 solution,what will be its strength by volume and % w/v respectively?
Friday, November 11, 2016 by Palak

Science
If 48 gram solute is present in 500 ml H2O2 solution,what will be its strength by volume and % w/v respectively?
Friday, November 11, 2016 by Anonymous

Science
I really need help on this project. I am not asking for all of the answers, I just need someone to explain what I should do for this experiment. And how to make a data table. Directions: 1. Design an experiment to support the hypothesis that light travels in straight lines ...
Friday, November 11, 2016 by Melinda May

Science
An aeroplane of mass 5000 kg is flying at an altitude of 3 km. If the area of wings is 50 m^2 and pressure at the lower surface of wings is 60000 PA,the pressure on the upper surface of wings is
Friday, November 11, 2016 by Jaideep

science
a body of mass 10kg is moved in a vertical circle calculate tangential acceleration
Friday, November 11, 2016 by annie

Physical Science
Materials: Epsom salts (MgSO4), ammonia (NH4OH) small jar or cup measuring cup Procedures 1. Dissolve 1 teaspoon of Epsom salts in a half cup of water. 2. Add 2 teaspoons of ammonia to the Epsom salts solution and stir thoroughly. Record your observations. 3. Allow the mixture...
Friday, November 11, 2016 by Steve

Science-Cells
I'm doing a lab report, and we are looking at an onion cell under a microscope. The teacher asks to explain why we put iodine on the sell. (ANSWER)= Cleaning it ?
Thursday, November 10, 2016 by I need Help Now

Science-Cells
What are the main parts of a plant cell? Cell membrane , Nucleus , Vacuole, Mitochondrion? Did I miss anything ? thanks.
Thursday, November 10, 2016 by I need Help Now

Science
Question 1- how does a multicellular organism develop? A- the cells differentiate. B- The cells shrink. C- One cell grows bigger. D- The cells replicate to form exact copies. <<<<
Thursday, November 10, 2016 by PLS HELP QUICK DONT HAVE TIME

science
does to skeletal system send signals to yuor brain
Thursday, November 10, 2016 by krystina

Physics science
A 10 ohm, 20 ohm lamp and 12v battery are connected in a parallel. A current of 1.8 A passes through the battery and a current of 1.2 A passes through the motor. 1) Determine the current through the lamp. 2) Calculate the potential difference across the motor. 3) is this the ...
Thursday, November 10, 2016 by Tina

Science
A small rock with a mass of 6g is dropped into a graduated cylinder with 20ml of water. The water rises to 23ml. What is the density of the rock?
Thursday, November 10, 2016 by CW

Science
How are a mold and a cast related?
Thursday, November 10, 2016 by SCIENCE HELP

Science
In a tennis match the player hits the ball to serve the ball travels 24m from the servers raquet to the opponents Raquet at an average speed of 40 meters per second.calculate the time taken
Thursday, November 10, 2016 by Alex

science
Explain which is more ionic NaF or LiF
Thursday, November 10, 2016 by Anonymous

Science
Why are the water molecule bonds at an angle and not straight like the CO2?
Thursday, November 10, 2016 by Alice Keign

science
Pluto has a shape that is nearly round, and it orbits the Sun. It has five known moons. Why is it called a dwarf planet and not a planet?
Thursday, November 10, 2016 by renee

Science
Unit 3 Test Multiple Choice Please select the correct response for the following questions. 1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. ...
Thursday, November 10, 2016 by Becky

Science
Which is the molarity of a solution containing 20 g of CH3 OH in 300 mL of solution
Thursday, November 10, 2016 by Victor

Physical science
A 100.0g sample of water at 20.0C is heated to steam at 125.0c.how many heat was absorbed?
Thursday, November 10, 2016 by William J Yelorbah

Science
An object of mass 50 kg moves with a speed of 10m/s. Calculate the kinetic energy of the object?
Wednesday, November 9, 2016 by ChaynikA

Science - Electrochemistry
In an experiment 0.0500 M AgNO3 was used to titrate 20 mL of 0.12 M NaCl solution. When silver electrode is used together with the pH electrode to measure potential at each point during the titration, the potential measured at equivalence point is 0.055 V. Unfortunately, a ...
Wednesday, November 9, 2016 by Sarah Lee

Science
Explain where the sun and planets are located in relation to one another.
Wednesday, November 9, 2016 by Anonymous

Science
A 75kg guy base jumped from a cliff in Norway. A 100N air resistance force acted on him. What was his downward net force before pulling the parachute?
Wednesday, November 9, 2016 by Anoymous

Science
Why are the water molecule bonds at an angle and not straight like the CO2?
Wednesday, November 9, 2016 by Alice Keign

Natural science
Why are the coldest temperatures at the lowest 50 km height from the surface of the Earth, occur generally at tropical tropopause?
Wednesday, November 9, 2016 by steve

computer science
what are the advantages and disadvantages if bitmap graphics? I really need help ASAP
Wednesday, November 9, 2016 by lassy

science
a bullet is shot from a springfield rifle with a speed of 3,015 ft/s. assuming the bullet moved at a constant velocity, what is the time required for the bullet to strike a target 4,146 meters away
Wednesday, November 9, 2016 by chris

MATH
I can't figure out some of them, and I need help! m - 7 < 6 1. m< -13 ** 2. m< 1 3. m< -1 4. m< 13 n - 8 > 5 1. n> 13** 2. n> 3 3. n> -3 4. n> -13 p + 5 < 10 1. p < -15** 2. p < 5 3. p < 15 4. p < -5 The science class is taking...
Wednesday, November 9, 2016 by HELPPPPPPPPPP

science
when two equal forces of f1 and f2 making an angle of 180 degree with each other the magnitude of their resultant is ................?
Wednesday, November 9, 2016 by sahar

Science
Four resistance each of 8 ohm are connected to a square. The resistance between any two diagonally opposite terminals will be ?
Wednesday, November 9, 2016 by Vanie

science
How is sun related to nuclear, electromagnetic, and heat energy?
Tuesday, November 8, 2016 by hello

Science
Four students dissolved 30g of salt in a 200ml solution of water.Each student heated his or her water solution to a different temperature ( Marcus had 10 and tyra had 25 Luis had 50 and Andrew had 75) which student most likely had the solution with the fastest dissolving rate ...
Tuesday, November 8, 2016 by Kate

Science
2Na(s) + 2H2O(aq) = 2NaOH (aq) + H2 (g) Is this reaction exothermic or endothermic? I don't understand ,
Tuesday, November 8, 2016 by Briaah

Physical Science
How much Cerium sulfate is needed to make a saturated solution in 100mL of water at 30 degrees Celsius?
Tuesday, November 8, 2016 by Mal

Science
•Explain the process of succession •Describe how changes in an ecosystem can affect organisms that live there •Describe the amount of time needed for ecosystem recovery What are the dependent and independent variables? Independent: Dependent:
Tuesday, November 8, 2016 by Embershy

Science
Which of the following correctly identifies active transport? A. Transport proteins move large molecules from areas of low. B. Transport proteins move large molecules from areas of low concentration areas of high concentration areas without the use of cellular energy. C.Small ...
Tuesday, November 8, 2016 by Ive

science
What is the volume of chlorine that is used to produce 292 grams of hydrogen chloride?
Tuesday, November 8, 2016 by lauren

Science PLEASE PLEASE HELP
Which of these statements about saltwater is correct? Saltwater freezes at a lower temperature Saltwater freezes at a higher temperature Saltwater does not freeze at any temperature Saltwaters freezing point depends on the temperature of the ocean floor***** PLEASE HELP ME
Tuesday, November 8, 2016 by ovais

science
Write about entropy and entropy generation in daily life P help me..
Tuesday, November 8, 2016 by aboddu

Science HELP PLS
1. What is a Genetic Mutation? A. the process of decreasing chromosome numbers to half of what the parent cell has B. the copying of DNA to form identical daughter cells C. a permanent change in an organism’s genetic code D. a fusion of egg and sperm cell to produce a new...
Tuesday, November 8, 2016 by Jia

science
if a block of mass 2kg slides on an inclined plane making an angle of 60° with the horizontal.Then find work done by force of gravity
Tuesday, November 8, 2016 by AYUSH

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