Wednesday
August 31, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

science
what is a vector
Sunday, February 7, 2016 by dion

maths,life science,history,geography
Traditional african mariage is an advantage for men only,not women
Sunday, February 7, 2016 by victor mofokeng

maths lit,life science,agric,geography
can I qualify to be agricultural inspector?0790748629
Sunday, February 7, 2016 by Anonymous

science
A stone from a window with an initial horizontal velocity of 10m/s. If the window is 20m high, and the ground is level, how many seconds will the stone reach the ground? How far on the ground will it reach?
Sunday, February 7, 2016 by nova

Science
A person stands between two cliffs and fires a gun.he hears two successive echoes in 2 seconds and 5 seconds after the gun was fired. Find the distance between the two cliffs?
Sunday, February 7, 2016 by lovepreet singh sidhu

science
a 2kg stone is dropped from the top of a 20 buliding (a) at what height does its potential energy energy equal to its kinetic energy?
Saturday, February 6, 2016 by richard

physical science
Determine the magnitude and direction of a resultant force on 500N,200N and 300N by calculating or by accurate construction and measurement use scale 10mm=50N
Saturday, February 6, 2016 by mongi

Science
Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the ΔG°rxn of each reaction below? 1) H2(g) + O2(g) <==> H2O2(l) ΔG°rxn=? (in ...
Friday, February 5, 2016 by Dan

Science
The stage of viral replication in which the viral nucleic acid is released inside the cell is ?
Friday, February 5, 2016 by Anonymous

Science
List at least three atmospheric properties that might change as you traveled from the Earth's surface to space. Temperature, gases, air pollutants?
Friday, February 5, 2016 by Anonymous

agric*life science*geography n maths literacy.
hi there! my question is which job of my subjects ?
Friday, February 5, 2016 by rowlievhuwa

science
2._____ clouds form at heights of 2,000 meters or less. A.Cumulus B.Cirrus C.Cirrostratus D.Altocumulus Erosion caused by waves can destroy ____. A.Rocky shorelines B.Sandy shorelines C.Beaches D.All of the above The horizontal distance between the highest or the lowest points...
Friday, February 5, 2016 by Debbie

science
Which of the following activities would contribute the most to global warming? -driving a solar-powered car -snowmobiling around a national park(i picked) -launching an engineless glider -trekking by horseback
Friday, February 5, 2016 by ???

science
which of the following is a consequence of using fossil fuels as an energy source • decreased carbon dioxide levels • increased biodiversity • increased acid rain • decreased ecosystem disruption
Friday, February 5, 2016 by kyran

Science help please
Hello i need some help with this science project please. How long would it take to get to mars if i'm travel 600 miles per hour. Thanks :)
Friday, February 5, 2016 by Meah

Science: Drifting Continents
Sandstone is a sedimentary rock. Which of the following characteristics would you look for in a piece of sandstone? A) Rock has sparkly or alternating color layers that are bent or folded B) Rock has layers and smaller pieces of rock in it. It also has fossil in it C) Rock has...
Friday, February 5, 2016 by TikiKiwi

science
co2 +H2o=c6H12o6+6H2o+6O2 in this reaction what is the reoxidation number of glucose
Friday, February 5, 2016 by Shovro

science
A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological studies to discover plants...
Thursday, February 4, 2016 by Jewels

science
Two identical masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other? a. The faster object has the same kinetic energy as the slower object. b. The faster object has less kinetic ...
Thursday, February 4, 2016 by shynice

science help PLS
An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving closer to Earth.
Thursday, February 4, 2016 by Oscar

Social Studies
In what way is geography an integrative science? a. Geography is an integrative science because it examines Earth in both physical and human terms.*** b. Geography is an integrative science because it borrows from physical sciences such as chemistry, biology, meterology, and ...
Thursday, February 4, 2016 by Kaai97

science
Some constellations, such as Ursa Minor, are visible in the sky year-round; other constellations appear for only part of the year. Explain why this happens. Please help this is my last question and it truly stumped! It'd mean the world if someone could explain this to me. ...
Thursday, February 4, 2016 by anon

His,math lit,geo,life science,l.o an other two language
Five ways the similarities and differences between nsfas and student loan
Thursday, February 4, 2016 by Trompies

science
calculate numerical value of current in inductor resistant circuit. l=1mH r=3k (ist=1ma at t=0) i1(t=1us)in ma. i0=1ma my work. i=i0(1-e^-(t/T)) 1*10^-3(1-e^(-1/0.33) i=0.952ma this is wrong do I need to add initial current to this(1ma). why is this wrong??
Thursday, February 4, 2016 by bearinthewoods

science
6. About 90% of all marine organisms live in the upper 180 m of the ocean. How does temperature and light intensity influence this fact? (What does temperature and light intensity have to do with where ocean life is located?)
Thursday, February 4, 2016 by Debbie

Science
Which statement best explains why tropical climates are so hot. They receive little rain. They receive more direct sunlight than other regions. (MY ANSWER) They lack vegetation. There are more hours of sunlight in tropical areas than other regions.
Thursday, February 4, 2016 by LOVE

Science
Which climate is warm, wet, and located on the edges of the tropics? Temperate marine. Highlands. Temperate continental. (MY ANSWER) Polar.
Thursday, February 4, 2016 by LOVE

science
a brick falls off scaffold at height of 80 m above the ground it velocity AfTeR FalLInG for 2 s Is 19;6 what iS IT MAgnitudE WheN IT HITS The GRound?
Thursday, February 4, 2016 by Saneh

science
The dissociation constant of ethanoic acid (ch3cooh) at 298k is 1.8*10^-5 in a buffer solution the concentration of ch3coo and ch3cooh are 0.05m and 0.1m respectively what is the ph of the buffer solution
Thursday, February 4, 2016 by abiola

science
How strongly gravity pulls on a object is called?
Thursday, February 4, 2016 by sea

science
The graph below shows your speed at different times while riding a bicycle. For how many minutes did your speed remain constant?
Thursday, February 4, 2016 by ?

science
What is the relationship between the major body systems
Thursday, February 4, 2016 by emily

Science
When a balloon filled with any gas and the end is tied. It is left in the air. What changes occur in the volume of the balloon? Give reason.
Thursday, February 4, 2016 by Priyanka

Science
1. How does a mutation in the DNA affect the way proteins are made? A) a mutation in the DNA results in miss happen tRNA molecules ** B) a mutation in the DNA results in a chance in the mRNA, but it does affect the protein C) a mutation in the DNA affects the structure of mRNA...
Wednesday, February 3, 2016 by Anonymous

Science physics
What is the magnitude of average force a pole vaulters exterts on a landing bag if it's 1.5 meters high and deforms by 0.5 M=60kg Height of the bar=4.5m His centre of mass is 1m
Wednesday, February 3, 2016 by Physics help on problem

Math
The science club sold 24 T-shirts last week and 18 T-shirts this week. What is the percentage of decrease in the number of T-shirts sold? A: 33% B: 25% C: 50% D: 75% How do you do this?
Wednesday, February 3, 2016 by Grant

Physical science
Describe how to determine the ideal machanical advantage of each type of simple machine How are the lever and the wheel and axle related?
Wednesday, February 3, 2016 by Angelina

help pleaze with science
Describe the weather in africa
Wednesday, February 3, 2016 by Anonymous

science
what is a phase where chromatin condenses to form chromosomes
Wednesday, February 3, 2016 by Anonymous

science
130cm3 of a gas at 20oc excert a pressure of 750mmhg calculate it's pressure if it's volume is increased to 150cm3 at 35oc
Wednesday, February 3, 2016 by Emmanuel osita

Science
Calculate the expansion work done when 50g of water is electrolysis under constant pressure
Wednesday, February 3, 2016 by Natalia

science
1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d? 2. A plant continues to grow throughout its life through the use of s a process called... a. alternation of generations b. photosynthesis c...
Wednesday, February 3, 2016 by jjiiddss

Forensic science
1.Some people believe that certain drugs such as marijuana should be legalized. Do you agree or disagree? What impact might legalization have on forensic science as a field? for the first one I think that marijuana should not be legalized because people can mistreat the drug. ...
Wednesday, February 3, 2016 by anonymas

science/maths
​a car moves with a speed of 30km/h for 10 minutes and then 50km/h for 20 minutes.what will be the total distance covered by the car for 30 minutes?
Wednesday, February 3, 2016 by aastha

science
Ravi prepared a solution of sodium chloride by mixing 5.85g of salt in 1l of water.Find molar mass of sodium chloride?
Wednesday, February 3, 2016 by rohini

science
why did not expose theaerasolto a high temparature
Wednesday, February 3, 2016 by trish

Science
Julie dissolved 20 g of sugar in a cup of water. The mass of the solution was 500 g. What volume of water did Julie start with?
Wednesday, February 3, 2016 by Anonymous

Science
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, February 2, 2016 by EEE

Science
If an astronaut with a tool belt accidentally pushed off from the shuttle, how could the tools in the belt be used to return the astronaut to the shuttle?
Tuesday, February 2, 2016 by Andrew

science help PLS
Which of the following is a sign of poor quality water? Zero turbidity A pH of 7.0 High phosphate content High dissolved oxygen is it d
Tuesday, February 2, 2016 by Oscar

science help PLS
Which of the following is a sign of poor quality water? Zero turbidity A pH of 7.0 High phosphate content High dissolved oxygen is it d
Tuesday, February 2, 2016 by Oscar

Science
Two forces of 5n and 12n respectively act on the same piun.Show how you would determine the magnitude of the resultant by using the tail to head and tail to tail method and Pythagoras theorem(13n)
Tuesday, February 2, 2016 by Lerato

Science
1. A ___ has a definite shape and a definite volume. (1 point) solid•• liquid gas molecule 2. Why is a gas able to flow? (1 point) Its particles have melted and can move around. Its particles have high viscosity and can move around. Its particles have enough energy ...
Tuesday, February 2, 2016 by Vanessa

science
A boy is standing at the top of the a building, 40 m high. He leans over the side and throws a pebble vertically upwards from the edge of the building at 12m.s^-1. The pebble reaches the ground at the foot of the building. Calculate time for the pebble to reach the ground
Tuesday, February 2, 2016 by Itumeleng

Science
1. 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 2. Which of the following describes the relationships between friction and inertia? when there is more friction, there is less inertia when there is less friction...
Tuesday, February 2, 2016 by Help Please

NATURAL SCIENCE
CAN YOU PLEASE HELP ME TO DRAW A PYRAMIT TABLE
Tuesday, February 2, 2016 by THATO

Science
A force of 20N act an object angle of 30 to the inclined plane . The object move 8.0m up the unclined plane what is the workdone by the force plz draw.
Tuesday, February 2, 2016 by Ibn isah pd.

Science
the active ingredient in the alergy medication claritin contain carbon,hydrogen,chloride,nitrogen,and oxygen its molecules formula is C22H23ClN2O2.the standard adult gosage utizies 1.572*10^19 molecules of the spicies determine the mass gosage of the active ingridient in the ...
Tuesday, February 2, 2016 by Kriatian ferrer

Science
A flatt horizontal road is been designed for 60km/hr speed limit if the maximun acceleration of the car travelling on the road is to be 15m/s at the above speed limit.what is the minimun radius of the curvature of the curve on the road
Tuesday, February 2, 2016 by Paul

Science (physics)
Before Felix enters the capsule, what can we say about his gravitational potential energy and kinetic energy?
Monday, February 1, 2016 by elle

Science
How does a butt work?
Monday, February 1, 2016 by Fredrick

science
The equilibrium constant for the gas phase reaction N2O4 ⇀↽ 2 NO2 at a certain temperature is K = 0.0466. If the initial concentrations are [N2O4] = 1.0 M, [NO2] = 0.0 M, what are the final concentrations of [N2O4] and [NO2], respectively? 1. 1.0 M ; 0.22 M 2. 0.8 ...
Monday, February 1, 2016 by cora

Science
How do you think a scientist might figure out a person’s identity from bones? My answer I think that depending on the shape and size of the bones are different for every person like you DNA. This is how they know who you are. it is also possible that your bones carry DNA ...
Monday, February 1, 2016 by Anonymous

Physical science
What is the current produced by a 9volt battery flowing through a resistance of 2*10 ohms
Monday, February 1, 2016 by Denise

Science
If a crate with 350N is pulled so that the crate slides at a constant velocity what is the friction force?
Monday, February 1, 2016 by Jane

Science
what is Porn?
Monday, February 1, 2016 by Girl with questions.

Science
A body of mass 8kg moving with a velocity of 10m/s collides with another body of mass 6kg moving in the opposite direction with a velocity of 50m/s.determine their common velocity in the direction of A after collision
Monday, February 1, 2016 by Yunus

MATERIAL SCIENCE
1. Calculate the theoretical density of Barium metal barium 2. Calculate the theoretical densities and packing factor of barium zirconate (BaZrO3), and barium cerate (BaCeO3), both of which form the perovskite structure
Monday, February 1, 2016 by MANFRED

Science
If a spring has a shiffness of 9,50nm-1 what work will be done in exered the spring by 60mm.
Monday, February 1, 2016 by Favour o idris

Science
What is the centripetal acceleration a satellite is orbiting the Earth at an altitude of 300.22 km?
Monday, February 1, 2016 by Jack

physical science
A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what angle was the ...
Monday, February 1, 2016 by Brian

science
What is the form of the graph, and what is the approximate distance traveled by the aircraft in 7.5 seconds
Monday, February 1, 2016 by tre

science
If exponential growth occurs in the population of a species of predator, the population of its prey will most likely decrease quickly. increase slowly. stay the same. experience exponential growth.
Monday, February 1, 2016 by sarah

science n4
a bullet is fired vertically upwards wth a initial velocity of 300m/s as it leaves the barrel.the rifle barrel is level with the ground and the rifleman stands in a trench.calculate the velocity of the bullet when it is 200m from ground level during the downward movement.
Monday, February 1, 2016 by nare

Science
Plz correct me if I'm wrong!! 1) Which of the following is a chemical change? (1 point) Boiling of water Melting a cube of ice Dissolving 10 grams of salt in water Splitting water into hydrogen and oxygen*** 2) What is the mass of water that results from combining 2.0g of ...
Monday, February 1, 2016 by Vanessa

science
Atomic no.of an element is 12. what is it valency?
Monday, February 1, 2016 by sakshi

science
A loaf of bread weighs 1,362 g. The weight in kilograms is Select one: a. 1,362 kg. b. 0.01362 kg. c. 0.1362 kg. d. 1.362 kg. Next
Monday, February 1, 2016 by katelyn

science
if more sugar is placed into a glass of iced tea than can dissolve in the te,the additional sugar will sink to the bottom of the iced tea. Which of the following statements best accounts for the observation that an oversupply of sugar crystals will collect on the bottom of the...
Sunday, January 31, 2016 by Flora

science STEM FAIR
Do all liquids evaporate at the same rate ? Liquids 1. Water 2. Nail polish " Remover " 3.Ginger ale
Sunday, January 31, 2016 by Jada .. ( friends call me Jaay / Jay )

science
Can you predict the force needed to stretch the rubber band to 40.0cm?why or why not
Sunday, January 31, 2016 by alicia

earth science
The global ocean covers about 70% of the Earth’s surface. If all the ocean water was uniformly distributed over the whole surface, what would be its depth? Assume that the Earth is a perfect sphere, and the average ocean depth is 4 km.
Sunday, January 31, 2016 by Marisa

SCIENCE HELP PLS
Which of the following is a source of graywater? Sewage water Shower water Water waste from an auto repair garage Water waste from a chemical company is it b
Sunday, January 31, 2016 by Oscar

Science
Describe one observation astronomers use to show that the universe is expanding
Sunday, January 31, 2016 by Sarah

Science
-Explain how and when the universe formed according to the big bang theory? -Explain how and when our solar system formed? -Describe one observation astronomers use to show that the universe is Expanding?
Sunday, January 31, 2016 by Sarah

science
1. The liquid part of the blood is called _____. (1 point) hemoglobin plasma platelets white blood cells 2. Your circulatory system can best be compared to _____. (1 point) gates a net pipes a balloon 3. Which of the following shows the correct order of blood flow? (1 point) ...
Sunday, January 31, 2016 by Anonymous

science
Which of the following describes Joseph Lister’s role in discovery and prevention of disease? (1 point) recognized the relationship between disease and cleanliness discovered that microorganisms cause disease in humans invented pasteurization developed a series of methods...
Sunday, January 31, 2016 by Anonymous

science
how many electrons are in the sodium sulphate?
Sunday, January 31, 2016 by jailos

Science
if a strong odour is smelt continuously for some time the sensation of smell of that substance weakness why?
Sunday, January 31, 2016 by Rabin

science
a body floats with only 30% of its volume out of water.calculate the density of this body.
Sunday, January 31, 2016 by kaunda kapalu

Science
which part of the tongue is stimulated by more temperature? Explain.
Sunday, January 31, 2016 by Rabin

SCIENCE
A MACHINE OF EFFICIENCY 60% IS USED TO RAISE A LOAD OF 150kg THROUGH A VERTICAL DISTANCE OF 2.5m.CALCULATE THE WORK DONE [IN JOULES]. I tried E=WORK OUTUT/WORK INPUT times 100% 60=150 times 10 times 2.5/work input times 100 60 times work input=3750 times 100 work input=375000/...
Sunday, January 31, 2016 by JOY

science
a 50 kg of astronaut ejects 100 g of gas from his propulsion at a velocity of 50 m/s. what is his resulting ?
Sunday, January 31, 2016 by kim allyson

Science
Find the resultant of two displacement vectors A and B, the magnitude of A is 45 meters and the magnitude if B is 25 meters?
Sunday, January 31, 2016 by Vince Jerald

Science
An artificial satellite circles around the earth at the height where the gravitational force is one fourth of that at earth's surface. If the earth's radius is R the height of the satellite above the surface of the earth is?
Sunday, January 31, 2016 by Shubham

Science
Explain how coal is useful in the production of iron and aluminium.
Saturday, January 30, 2016 by Anonymous

science
what is the velocity of a 0.7 kg ball that has a momentum of 1.4 kg m/s
Saturday, January 30, 2016 by kc

science
Which is not part of your immune system's response to a disease-causing organism? vaccination recognition disposal immunity vaccination right
Saturday, January 30, 2016 by Anonymous

Science
Ionic bonds: a. result from the sharing of electrons between atoms. b. form only between polar molecules. c. form between atoms that develop opposite charges. d. result from the natural repulsion that develops between protons. answer is C
Saturday, January 30, 2016 by mandy

Science
As a result of rigorous experimentation Question 7 options: more hypotheses may be developed. more questions may be asked. a new biological concept could emerge. entire theories may be modified or discarded. all of these i suppose
Saturday, January 30, 2016 by mandy

Science
Hypotheses can be rejected or supported by experiments, or, in some instances, new observations. i think it's true
Saturday, January 30, 2016 by Seth

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