Tuesday
May 24, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

science
Gallium crystallizes in a simple cubic lattice. Sketch the unit cell. Determine the number of atoms present in the unit cell. The density of gallium is 5.904g/cm^3. Determine a value for the atomic (metallic) radius of gallium.
Tuesday, May 24, 2016 by Mustapha

earth science
When I bumped the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction. 1st 2nd 3rd
Tuesday, May 24, 2016 by r

science
a radioisotope, Iodine-131, has a half life of 8.1 days. explain what this means. draw a particle diagram for a sample 12 particles of I-131 initially after 8.1 days and after16.2 days.
Tuesday, May 24, 2016 by mason

science
calculate delta E & delta H when 100dm^2 of helium at S.T.P are heated to 373k in a closed container. assuming that the gas behaves ideally and CV=12.55g/mol
Tuesday, May 24, 2016 by Ty

Science
escribe why there are different layers in the atmosphere what are the charecterestics of them which one has the ozone layer which layer is the coldest which is the hottest which one holds the aurora borealis
Tuesday, May 24, 2016 by Help me

Science
A man walked 2.5 km in 50 seconds how fast did he go in meters per second?
Monday, May 23, 2016 by Jared

Science - 6th grade
A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute. My response : Gravity will pull the skydiver down to the ground. As they're in the air and go ...
Monday, May 23, 2016 by Carina

science
calcium reacts with water to form calcium hydroxide and hydrogen.how many moles of water are required to react with 0.5 mole of calcium?
Monday, May 23, 2016 by laona

science
Write about different types of plants?
Monday, May 23, 2016 by mayank

Science
Solubility of nacl in 100g of water at80degree
Sunday, May 22, 2016 by Vishali

science
Assume that some sugar was put into some rice by mistake. Design an experiment to separate the mixture. I'm not sure what I should do, can someone help me out?
Sunday, May 22, 2016 by truce

Science (Biology)
Use your knowledge of photosynthesis to explain what is happening in the following graphs. 67(dot)media(dot)tumblr(dot)com /d99a0dd856c87dfc21b9314f89019994/tumblr​_o7ltp1unLS1tt1il6o1_1280.jpg
Sunday, May 22, 2016 by Michlle

science
14. A car with a mass of 1,200 kilograms is moving around a circular curve at a uniform velocity of 20 meters per second. The centripetal force on the car is 6,000 newtons. What is the radius of the curve?
Sunday, May 22, 2016 by Anonymous

science
Calculate the equilibrium constant of NH4HS H2S + NH3
Sunday, May 22, 2016 by andile

Science
name all structures that supply blood to the liver
Sunday, May 22, 2016 by misha

Science
What develops from the Allantois? (*note the umbilical cord is not an option for this question)
Sunday, May 22, 2016 by Ally

Science
What never asks a question but often answers
Saturday, May 21, 2016 by Jeans

Science
When hydrogen is fitted into the reactivity series it comes after what ?
Friday, May 20, 2016 by Crosby

Engineering science n3
a train with a mass of 120Mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN mass of the train. The force in the draw bar is 30kN. Calculate: a) The force required for a constant speed b) The force that cause acceleration c)The acceleration
Friday, May 20, 2016 by Valencia

Science
The mitochondrion is responsible for a. producing glucose from sunlight c. converting glucose into usable energy b. burning up old cell parts d. burning usable energy
Friday, May 20, 2016 by Help me please

science(chemistry)
How is ethanol after 1 minutes of evaporation
Friday, May 20, 2016 by Anonymous

science
in a compost bin insects bugs,slug,bacteria,fungi,and worms help to ________ biomass?
Thursday, May 19, 2016 by stephoo

science
55,000J of work is done to move a rock 25m. How much force was applied?
Thursday, May 19, 2016 by stephoo

science
A man shots a rifle with 30.m and hit's an object at 1.90cm. What is the flight time? What is the velocity of the shot? 1.90=.19m
Thursday, May 19, 2016 by Leila

science
Which of the following is the best instrument to use to prepare a solution
Thursday, May 19, 2016 by Isabella

science
A geologist working in a national park finds a mineral. He is carrying a kit that contains a penny, a hard lens , a piece of tile a geologic hammer, and a jackknife. Describe how the geologist can use these items to determine some of the minerals characteristics
Thursday, May 19, 2016 by please help

science
Tom is making the locations of the active volcanoes on a world map. Explain how the locations of the volcanoes are related to earth's plates? please help me im begging you
Thursday, May 19, 2016 by please help

Science
What effect did the colour filters blue and green have on the red yellow and pink flowers? Explain the reasons for the change in colour
Thursday, May 19, 2016 by Nelicha

science
What is the % labelling of oleum in which mole fraction of H2SO4 is 0.49?
Thursday, May 19, 2016 by Samal

science(chemistry)
2 mL 1.5 M naoh and 1.5 mL 2 M naoh mixed solution's concentrate=?
Thursday, May 19, 2016 by rajib

Maths,science,lifescience nd geography
Human rights violation
Thursday, May 19, 2016 by Marion tlangelani

Science
Rocks are collections of __________ .
Thursday, May 19, 2016 by Anonymous

SCIENCE PHYSICS
A Sky-diver(falling vertically)starts from rest at time t=0.His acceleration is non-uniform until be reaches a steady speed of 50m/s at t=10s.He open his parachute at t=20s and decelerates until t=25s.From t=25s he falls at a steady speed of 5m/s.Draw the speed-time graph for ...
Thursday, May 19, 2016 by SUMAN DAS

science
15g of an unknown hydrocarbon burns in oxygen to give 4,7g of carbon dioxide and 19,35g of water calculate the empirical formula
Wednesday, May 18, 2016 by Zandile

science
you plan to measure the thermal energy released durning a chemical reaction what tool would you use
Wednesday, May 18, 2016 by kayalh

Science
Explain the law of motion needed to solve this problem and then solve it. On Planet Zorg a 30 kg barbell can be lifted by only exerting a force of 180 N. What is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change if on Earth. Is it ...
Wednesday, May 18, 2016 by Aiecha

Science- Boo?
forests and fisheries are an example of what?
Wednesday, May 18, 2016 by suomynonA

science
The equation y=5sin(3x-4)where y is in millimeters x is in metres and t is in seconds,represents a wave motion
Wednesday, May 18, 2016 by Arugo Assmpta

science
1. A car slows down from 23 m/s to 14 m/s over a time period of 3 seconds. The car’s mass is 1330 kg. What is the car’s acceleration, momentum, and force.
Wednesday, May 18, 2016 by joan

science
why the surface tension of water is greater tha that of methylated spirit?
Wednesday, May 18, 2016 by ketseletso

Science
If the earth exerts a 500 N gravitational force on an object in near space, how much force does this object exert on the earth, and by what law can this be asserted?
Wednesday, May 18, 2016 by Alyssa

Spanish
What are schools and organizations in silicon valley doing to foster growth for hispanic and latino students? a. Offering math programs in the summer b. Offering english classes year round C.offering tutoring classes in science during the weekends d. offering writing classes ...
Wednesday, May 18, 2016 by Girltt

Science
Why do earthquakes occur along the San Andreas fault
Wednesday, May 18, 2016 by Anonymous

Germination-Science
Need help filling in the blanks for the following: Topic: Germination The embryo of the seed is made up of the root and the f____ l_____. The first leaf will grow to become the s_____ of the plant. Is there anything wrong with the above statements? Someone told me that "...
Wednesday, May 18, 2016 by chimingbell

Science
What is delta U when 2.0mole of liquid water vapourises at 100 degree celcius? The heat of vapourisation, Delta H vap. Of water at 100 degree celcius is 40.66 KJ/Mol
Wednesday, May 18, 2016 by Ankit Sharma

English,maths,science,agric,geograpohy,life orientation
African slaughter rituals should be allowed in the suburbs
Wednesday, May 18, 2016 by Nompilo

science
Phosphoric acid is very important compound used to make fertilizers.PPhosphoric acid can be prepared in two ways: Reaction 1: P4 + 5O2 = P4O10. Reaction 2: P4O10 + 6H29 = 4H3PO4. Supposing we allow 272 g of phosphorus to react with excess oxygen which forms tetra phosphorus ...
Tuesday, May 17, 2016 by Elijah

Science
Need help filling in the blanks for the following: Topic: Germination The embryo of the seed is made up of the root and the f____ l_____. The first leaf will grow to become the s_____ of the plant. Is there anything wrong with the above statements? Someone told me that "...
Tuesday, May 17, 2016 by chimingbell

science
Suppose you need 2.0 L of 6.0 M sulphuric acid, and you have a bottle of concentrated acid of 18.0 M sulphuric acid. a). How much of this would be needed to a 2 L, 6.0 sulphuric acid solution? a). Describe how you would prepare this solution.
Tuesday, May 17, 2016 by Elijah

Science HELP
What types of changes does a hurricane cause along the Texas coast? (Weathering, erosion, or deposition)
Tuesday, May 17, 2016 by Anonymous

Science
Suppose the velocity of a car is 10 m/s at t = 0 s, and is 20 m/s at t = 30 s. Which of the following must be true? The car had a positive instantaneous velocity in the interval. The car had a positive instantaneous acceleration at each moment in the interval. The car had a ...
Tuesday, May 17, 2016 by Mike

science help pls pls pls
Generally speaking, how does the complexity of Colorado's geology compare with the complexity of Florida's geology? Colorado's geology is more complex than Florida's geology. Florida's geology is more complex than Colorado's geology. The geology in ...
Tuesday, May 17, 2016 by Oscar

science
an electric heater draws a current of 10A when connected to a 200 V supply. what current will the heater draw when it is connected to a 220 V supply.
Tuesday, May 17, 2016 by MOSTWWANTED

science
which of the following illustrates conduction as a mode of heat transfer 1 point a microwave oven produces electromagnetic waves that transfer to the food in the form of head ** leaving a metal spoon in a bowl of hot soup will make the spoon at a well pasta rises and falls ...
Tuesday, May 17, 2016 by please help

Science
A ring roll down along an inclined plane starting at a height 4m. Find the velocity when it arrives at the base of the plane. (y 2.5m) ?
Tuesday, May 17, 2016 by Taha

computer Science
Automata theory and regular expessions prove that (A ∪ B)* = A*(BA*)*.
Tuesday, May 17, 2016 by Denial

science
A ladder 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground at rate 2 cm/s . How fast is its height on wall decreasing when foot of ladder I'd 4 m
Tuesday, May 17, 2016 by anjali

science
suppose you need 2.0L of 6.0mol sulfuric acid and you have a bottle of concentrated acid of 18.0mol sulfuric acid. (a) How much of this would be need to a 2L of 6.0mol sulfuric acid solution? (b)Describe how you would prepare this solution?
Monday, May 16, 2016 by simion

physical science
John is using a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. How much work must be done on the sail?
Monday, May 16, 2016 by bob

science
A ball of mass 0.5 kg is released from rest at a height of 30 m. How fast is it going when it hits the ground?
Monday, May 16, 2016 by jose

science
A man throw a stone over a cliff and hear it strikes at the bottom after 8.00sec the temperature is 25 celsius. What is the height of the cliff in km.
Monday, May 16, 2016 by Aloysious

Science
Luster, Malleable, Ductile, Conductor, Solid at room temperature: Which element could be described by the list of properties above? A) magnesium B) mercury C) neon D) phosphorus***
Monday, May 16, 2016 by CoolDude

science
If Faraday hd used a more powerful battery in his experiments with electromagnetic induction, what affect would this have had on his galvanometer's measurements of current when the battery was fully connected? explain your reasoning. Thanks again!
Monday, May 16, 2016 by Katie

science
Describe how turning off the electric current in an industrial magnet affects its magnetic field. Thanks!
Monday, May 16, 2016 by Katie

Science
What happens to energy and matter during a chemical reaction?
Monday, May 16, 2016 by Pickle

Science
State the reagents that can be use to prepare the following salt potassium chloride(Kcl)
Monday, May 16, 2016 by Mcbright Tete Nyinaku

mathematics, science, accounting
Can a right-angled prism of clear ice be used for total internal reflection of right through 90degrees, bearing in mind that Ice has a critical angle of 48,8degrees?
Monday, May 16, 2016 by CONNIE

Science
Historical models of the solar system include: A.Helliocentric,B.nebular,C.Geocentric model or earth centered universe and a _ model or sun centered universe
Monday, May 16, 2016 by Hailey

science
For your discussion assessment, you will present your proposal of a device that minimizes heat transfer.
Monday, May 16, 2016 by jai

natural science
we must combine sodium carbonate with which acid to get sodium sulphate?
Monday, May 16, 2016 by Junior

Physical science
An alpha particle is identical to A) a neutron B) a helium nucleus C) an electron or D) a hydrogen nucleus
Sunday, May 15, 2016 by Angela

science
A gaseous compound containing carbon and hydrogen was analyzed and found to cons ist of between 80 and 90 percent carbon by mass. At 145ºC and 1.00 atm, the density of this compound is 2.45 g/L. What is the molar mass of the compound?
Sunday, May 15, 2016 by Anonymous

Science
The temperature of a silver bar rises by 10. 0°c when it absorbs 1230 jof energy by heat. The made of the bar is 525 g. Determine the specific heat of silver.
Sunday, May 15, 2016 by Kathryn Moore

Science
1. Massive amounts of destructive energy are released when a nuclear fission bomb explodes. Where does that energy come from? a) A chain reaction occurs when uranium atoms split, releasing nuclear energy. b) Molecules break down, releasing chemical energy. c) Hydrogen atoms ...
Sunday, May 15, 2016 by Lez

Science (chemistry)
If 1mile of methane(CH4) is releases 890 kJ/mole, how much energy is released per gram of methane?
Sunday, May 15, 2016 by Ambrosia

Science
Kudzu, a nonnative species, was brought to Georgia for decorative purposes. It is a vine that grows quickly and covers everything in it's path. It can also grow on trees and block the sunlight. How is kudzu an environmental issue for Georgia?
Sunday, May 15, 2016 by Kirsten

science
1 evaluate the market failure in south Africa 2 base your argument on south african context and also outline its effects thereof 3 evaluate at least four types of market failure and also how the government should correct the market failure 4 use appropriate examples, pictures ...
Sunday, May 15, 2016 by unarine

science
a body is thrown upward with velocity v . the height at which P.E is one third of K.E is ? answer is in terms of v
Sunday, May 15, 2016 by Wilbur

Science
If too much of an unsaturated fat is added to bromine water, could this affect decolourisation of bromine water? All help is appreciated... > C >
Sunday, May 15, 2016 by Stoof

Science
The moon is about 384000 km the earth and its paths around earth is circular. The moon taken 24hr to complete one orbit. The speed at which the moon orbits the earth in km/ hour is
Sunday, May 15, 2016 by Ali

Science
Calculate the density of a 45g nickel weight and a volume of 22 cubic centimeters.
Saturday, May 14, 2016 by Austin

Advance Math,Science
The solubility of sodium chloride is 35.4g of water at room temperature. What mass of sodium chloride can be dissolved in 1kg of water at room temperature?
Saturday, May 14, 2016 by Tabbie

Science
What happens to your speed velocity and acceleration as you run circular laps?
Saturday, May 14, 2016 by Stupid person

SCIENCE
A BOX HAS A BASE SURFACE AREA OF25cm2 AND THE WEIGHT OF 100N.CALCULATE THE PRESSURE IT EXERTS ON THE GROUND.
Saturday, May 14, 2016 by JOY

science
Write a structural program to calculate the average of 10 students in 3 courses. Hint score < 40 fail
Saturday, May 14, 2016 by olu

science
give five application of Doppler effects
Saturday, May 14, 2016 by Anonymous

Life science, Life science and History
I want to be a doctor (immunologist) I'm not sure about the last subject should it be history or Geography
Friday, May 13, 2016 by Wendy

Science
A density bottle weigh 0.25and0.75 when filled with water and 0.65N when filled with alcohol . Calculate the volume of water and alcohol
Friday, May 13, 2016 by Adama

Science
What eletromagnet wave not used for coumintcation plz help
Friday, May 13, 2016 by Cheyenne

science
write a formula for this compound potassium nitrate
Friday, May 13, 2016 by Regina

science
Calculate the kinetic energy in joules of a body of mass 30kg at a velocity of 3ms-1
Friday, May 13, 2016 by maria

science
Which kind of energy transformation occurs when a skater's board falls back to the ramp?
Friday, May 13, 2016 by bob

comprehension science
how can a cyclist minimize friction as he or she rides?
Friday, May 13, 2016 by bob

science
what is the length of a simple pendulum that has a period of 2.8 seconds (g=10)
Friday, May 13, 2016 by emmanuel

Science-Physics
As shown below, a 2.00 kg mass is connected to an unknown mass m via a massless rope and a massless, frictionless pulley. The mass m is on a ramp angled 20 degrees above the horizontal. The coefficients of kinetic and static friction are μk=0.35 and μs=0.45, ...
Thursday, May 12, 2016 by Justin

science 4th grade
What is the property of matter that keeps a moving object in a straight line called
Thursday, May 12, 2016 by Anonymous

Science
If 100 mL of hydrogen peroxide decomposes how many liters of O2 is formed
Thursday, May 12, 2016 by Sawyer

Science
The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the ...
Thursday, May 12, 2016 by HELP ASAP

6th Grade Science - Connections Academy
Why is it important to understand how an ecosystem is organized? (essay)
Thursday, May 12, 2016 by Geek Girl

science
a structure holds a baby. TRUE or FALSE. Explain. Show your work. Doublecheck and be patient.
Thursday, May 12, 2016 by Varsan

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