Friday
July 31, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

science
I need help Please!!!
Tuesday, January 27, 2015 by Abby

Science
True / False: If a 40 kg person is accelerating at 10 m/s^2,then the magnitude of the force acting on him or her is 400 N. 1.How much force is needed to make a 60 kg object accelerate at a rate or 2.0 m/s ^2? 2.What is the acceleration of a 30 kg objedct when 180 n of force is...
Tuesday, January 27, 2015 by Makayla<3

Science
A male peacock displays his colorful tail feathers in order to 1) increase the success rate of asexual reproduction 2) increase the gestation period 3) release gametes into its surroundings 4) attract a mate I chose 4
Tuesday, January 27, 2015 by Abby

science
When a fan is turned on it changes electrical energy into blank energy is it ma. Motion b.magnetic c. Gravitational. D. Electromagnetic
Tuesday, January 27, 2015 by jenn

science
calculate the electric potential due to 0.001c0ulomb of charge at a distance of 100cm.
Tuesday, January 27, 2015 by Nitumoni

Science
#1 Which of the following allows a plant's vascular system to work as a transport system? A A plant's vascular system is made up of specialized cells that move around the plant as it grows. B A plants vascular system is made up of specialized cells that are covered in ...
Tuesday, January 27, 2015 by Maark

science
The steel round frame is 2,4m high. There have to be wrapd five coils around the frame. One coil diameter is 35mm. Each coil is 50m long. All of the coils have to be wrapd next to each other.What must the diameter be of the frame if the hight of the frame is 2,4m.
Tuesday, January 27, 2015 by Jan

science
what is the centripetal of a 50.5-kg object traveling 25 m/s around a circular track with a radius of 10.0 m?
Monday, January 26, 2015 by marilyn

science
ok i had some trouble but i think i figured it out work= force *power??
Monday, January 26, 2015 by jordana

science
Shoe companies imbed unique designs on bottom of the sneakers they manufacture.what is the made n purpose? A to increase potential energy B to decrease friction C increase friction D to decrease potential energy. I think its C am I correct?
Monday, January 26, 2015 by jen

Science
A lead fishing weight with a mass of 57g absorbs 146 cal of heat. If its initial temperature is 48 C, what is its final temperature?
Monday, January 26, 2015 by Kylie

science
which one of earth's layers has the hottest temperature? why?
Monday, January 26, 2015 by patrisha

Science
what is the controlled variable of a homemade stethoscope
Monday, January 26, 2015 by Amari

science
How can a streak plate help you identify a mineral?
Monday, January 26, 2015 by Kassidy

Science
What is the Independent variable of a homemade sterthoscopes
Monday, January 26, 2015 by Amari

science
what is the weight on earth of an object that has a mass of 17kg?
Monday, January 26, 2015 by ashanti

Science
If the mass of a ball is 20g and h is 8m, calculate the kinetic energy when it has a velocity of 2ms raise to power minus 1
Monday, January 26, 2015 by Olaleye

science
Bacteria are invisible to humans except under a microscope. Which evidence did Pasteur use to show that bacteria were the cause of soured wine? A. Heated wine did not sour B. Capped wine did not sour C. Filtered wine did not sour D. Chilled wine did not sour I need help to ...
Monday, January 26, 2015 by PLZZ Help

science
what is active transport
Monday, January 26, 2015 by KK

science
passive transport involves movement of substances...... A) from areas of lower concentration areas of higher concentrations. B)from areas of higher concentrations to areas of lower concentration C) from areas which the concentration has reached a balance D) from areas of ...
Monday, January 26, 2015 by KK

science
how is osmosis different from diffusion?
Monday, January 26, 2015 by KK

science
which of the following correctly identifies active transport
Monday, January 26, 2015 by KK

Science
A certain object has a volume of 25.0 mL and a mass of 100 g. What is the density of the object?
Monday, January 26, 2015 by Guest

Science
Check My Answers, please? Which of the following planets is considered a rocky, or terrestrial, planet? Venus **** Neptune Saturn Uranus Which of the following statements about the beginning of the solar system is true? The planets that formed closest to the sun became gas ...
Monday, January 26, 2015 by Kenxie

physical science
A bungee jumper jumps from a high bridge 100 m above a river. How fast does he fall after he has covered 60 m after jumping from the bridge? (Ignore air resistance in the fall.)
Monday, January 26, 2015 by Horace

science
A rectangular building lot is 1200 ft. by 120 ft. Determine the area of this lot.
Monday, January 26, 2015 by kiki

Physical Science
A hot metal spoon with a mass of 77.0 grams and a temperature of 95.0 degrees celsius is placed into a cup containing 100 grams of water at 20 degrees celsius. When the spoon and water reach equilibrium, they both have a temperature of 25 degrees celsius. What is the spoon ...
Monday, January 26, 2015 by Mia

Science
Explain how asexual reproduction occurs and how it limits the spread of harmful characteristics.
Monday, January 26, 2015 by Fairypenguingirl

Science
. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find the percent concentration at this temperature. 3. A solution of acetone contains 20 ml of acetone in 480 ml of water. Calculate the % concentration of solution
Sunday, January 25, 2015 by Harsha

science plz help right now!!!!
1.which of the following could be true of two different species that have a competive relationship in the same ecosystem? A.one species preys on the other B .the relationship is mutually beneficial. C.They share the same niche D.one species benefits, while the other is neither...
Sunday, January 25, 2015 by HIIII LoL

accounting,life science,history and maths lit
What career path can I fellow doing these subjects?
Sunday, January 25, 2015 by nokuthula

concept development
Which of the following is the crux of the interrelationship between mathematics and science? A. About half of the basic math concepts are related to science concepts. B. The basic concepts of mathematics are the basic process skills of science. C. Basic mathematics process ...
Sunday, January 25, 2015 by Daniella

Science
Identify and discuss at least two forces that would be involved when an elderly patient who is proped up at about 4 degrees in a bed and slowly slides down to an almost horizontal position?
Saturday, January 24, 2015 by Ella

Science
For the dissociation of acetic acid, CH3COOH CH3COO- + H+, the free energy change, ΔG° = 27.26 kJ/mol. What is the free energy change, ΔG°', in the biochemical standard state? Given R = 8.315 J/mol · K. T = 25°C.
Saturday, January 24, 2015 by Laura

concept development
Which of the following is not a reason to make mathematics and science instruction relevant? A. To protect schools from being sued for discrimination B. To consider diversity in race, ethnicity, social class, and gender C. To build on concepts that children learn before they ...
Saturday, January 24, 2015 by Daniella

home economics
Please help me!,how is home economics related to mathematics,science and social,spiritual and moral education (ssme)?
Saturday, January 24, 2015 by sara

accounting,life science and history
What course can I do in college o university and career job can I persue after I've got my degree
Saturday, January 24, 2015 by nokuthula molekoa

science
A tractor pulls a tree trunk across a horizontal piece of ground. If the force in a chain is 3000N and the chain forms an angle of 30 degrees with the ground, calculate the force with which the tree is pulled across the ground and the force with which the tree is lifted
Saturday, January 24, 2015 by Anonymous

Science plz help
Explain the basic parts of a major theme in molecular biology: the pathway of DNA to RNA to proteins. Include a general idea of what occurs at each stage
Friday, January 23, 2015 by Sara

Science
1)What is the Theory of Plate Tectonics? 2)What physical features are caused by plate tectonics? 3)What causes Earth's plates to move continuously?
Friday, January 23, 2015 by Anonymous

Science
How are Newton’s second and third laws of motion important to your everyday life?
Friday, January 23, 2015 by TINA

science
the vapour pressure of pure liquid benzene and toluene are 160mm and 60 mm repectively. calculate the vapour pressure of an equimolar solution at the same temperature?
Friday, January 23, 2015 by priyanka

ENGLISH
1.Is the group of words a simple sentence, a compound sentence, a run-on sentence, or a sentence fragment? Her computer has new software, it runs much faster now. A. run-on sentence B. sentence fragment** C. compound sentence D. simple sentence 2.Is the group of words a simple...
Friday, January 23, 2015 by SKI

science
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-4.25 10^7) t^2 + (3.45 10^5) t, where v is in meters per second and t is in seconds. The acceleration of the bullet just as it leaves the barrel is zero. (a) Determine the ...
Thursday, January 22, 2015 by Anonymous

science
A ball is thrown upward from the ground with an initial speed of 16.0 m/s; at the same instant, another ball is dropped from a building 12 m high. After how long will the balls be at the same height above the ground?
Thursday, January 22, 2015 by Leah

science
a satellites original velocity is 10,000 m/s. after 60 seconds, it is 5,000 m/s. what is the satellites acceleration
Thursday, January 22, 2015 by Anonymous

science
a cars velocity changes from 0 m/s to 30 m/s in 10 sec. what is the cars average acceleration
Thursday, January 22, 2015 by Anonymous

Science
Are these equations balanced or unbalanced 3. Cu+H2SO4 Yields CuSO4+H2 Balanced 4. 2Fe+3S Yields Fe2S3 Balanced 5.N2+H2 Yields NH3 Unbalanced Answer this Questio
Thursday, January 22, 2015 by M

Science
true or False in a physical change some of the physical properties of substance may be altered and the chemical composition remains the same
Thursday, January 22, 2015 by M

Science
True or False Another name for chemical change is chemical bond
Thursday, January 22, 2015 by M

Science
Are these equations balanced or unbalanced 6. 2AlN Yields 2Al+N2 Balanced 7.Mg(OH)2+2HCl Yields MgCl2+2H2O Balanced 8. K+H2O Yields H2+KOH Unbalanced
Thursday, January 22, 2015 by M

science
Which place is most likely to have cold weather and a cold climate year-round
Thursday, January 22, 2015 by Anonymous

Science
Are these equations balanced or unbalanced 3. Cu+H2SO4 Yields CuSO4+H2 Balanced 4. 2Fe+3S Yields Fe2S3 Balanced 5.N2+H2 Yields NH3 Unbalanced
Thursday, January 22, 2015 by M

Science
Are these equations balanced or unbalanced 1. Mg + 2HCl Yields MgCl2+H2 Balanced 2.H2+O2 Yields H2O Unbalanced
Thursday, January 22, 2015 by M

Conceps of development
Which of the following is the crux of the interrelationship between mathematics and science? A. About half of the basic math concepts are related to science concepts. B. The basic concepts of mathematics are the basic process skills of science. C. Basic mathematics process ...
Thursday, January 22, 2015 by Daniella

math
sharon completed her reading homework in 2/3 hour.she completed her science homework in 5/6 hour. how much longer did it take sharon to complete her science homework
Thursday, January 22, 2015 by hannah

science
how can you represent temperature in scientific terms??
Thursday, January 22, 2015 by jiskhania

Science Ecosystem Exam
A biologist studying a desert ecosystem observes that the population of a lizard species increases following particularly hot, dry period that causes a snake population to decline. What could the biologist hypthesize about the roles of these two species? A) The lizard preys on...
Thursday, January 22, 2015 by Birdy

Science
If you have a beaker that contains 100ml at 40 degrees and a beaker that contains 200ml at 25 degrees. After a while the temperature of both liquids have decreased. In terms of energy describe what has happened to the liquids.
Thursday, January 22, 2015 by Liam lowe

accounting,life science,history and maths literacy
What can I study after matric and what career job can I persue? Please help I'm confused
Thursday, January 22, 2015 by nokuthula molekoa

science
Some hypothetical metal has the simple cubic crystal structure. If its atomic weight is 70.4 g/mol and the atomic radius is 0.126 nm, compute its density in g/cc.
Thursday, January 22, 2015 by Cam

Science
Which foods are lipids found in, and what is their function in the body? A: lipids are found in sugars and starches and are the main source of energy for the body B: lipids are found in fats and oils and are an essential component of cell membranes C: lipids are found and fats...
Thursday, January 22, 2015 by Anonymous

Science
Every individual including young people can make decisions to use resources wisely use the terms reduce reuse and recycle to explain how the students in the image above can help minimize solid waste. HELP LAST DAY TO DO THIS I NEED AN ANSWER.
Thursday, January 22, 2015 by Chris

science
Locate and click on this section of the geologic time scale, and list the other possible names that could have been used to describe this era, and why?
Thursday, January 22, 2015 by Dayna

computer science
a program to input the prices of two items as well as the quantities purchased, and compute the amount of the sale. Use both pseudo code and flowchart diagrams.
Thursday, January 22, 2015 by vinnie

Science
The cell theory was A: developed by Robert Hooke B: developed before microscopes were invented C: developed only after electron microscopes became widely used D: developed by many scientists over many years Is the answer A?
Wednesday, January 21, 2015 by Anonymous

physical science
if you drop an object from a height of 0.8m, it will hit the ground in 0.40s. if you throw a baseball horizontally with an initial speed of 29m/s from the same height, how long will it take the ball to hit the ground
Wednesday, January 21, 2015 by Anonymous

Science
Most bacteria are A: unicellular eukaryotes B: unicellular prokaryotes C: multicellular eukaryotes D: multicellular prokaryotes Is the answer B?
Wednesday, January 21, 2015 by Anonymous

Science
Which foods are lipids found in, and what is their function in the body? A: lipids are found in sugars and starches and are the main source of energy for the body B: lipids are found in fats and oils and are an essential component of cell membranes C: lipids are found and fats...
Wednesday, January 21, 2015 by Anonymous

Science
Oxygen moving from the bloodstream into a cell down a concentration gradient is a form of A: osmosis B: endocytosis C: Active transport D: passive transport Is the answer D?
Wednesday, January 21, 2015 by Anonymous

Science
Is the gene for sickle cell anemia more likely to be dominant or recessive?
Wednesday, January 21, 2015 by Mike

English
What is the warrant in this article? BOULDER, Colo. — JUST after Christmas, Veronica Rutledge of Blackfoot, Idaho, took her 2-year-old son to a Walmart store to spend holiday gift cards. As they strolled by the electronics section, according to news reports, the toddler ...
Wednesday, January 21, 2015 by Anonymous

English
What is the claim, warrant, and grounds in this article? Smart Guns Save Lives. So Where Are They? BOULDER, Colo. — JUST after Christmas, Veronica Rutledge of Blackfoot, Idaho, took her 2-year-old son to a Walmart store to spend holiday gift cards. As they strolled by the...
Wednesday, January 21, 2015 by Anonymous

Science
A small fish in the Pacific Ocean watches a shark swim by a large rock a few meters away. Which of the following is the the reference point in this scenario? A. Shark B. Large rock C. Water D. Pacific Ocean Is the answer C? Thank you
Wednesday, January 21, 2015 by Callie

science
how many milliliters of .2 M sodium hydroxide are needed to completely neutralize 25.0g of sulfuric acid
Wednesday, January 21, 2015 by Anonymous

Science
If the net force on an object is 0 N, the forces are considered unbalanced. True False Is the answer False? Thank you
Wednesday, January 21, 2015 by Callie

Science
What are 5 key accomplishments of Marie and/ or Pierre Curie?
Wednesday, January 21, 2015 by jeje

science
An experienced mountaineer decided to climb mount everest using the same route in the same season and with similar materials and equipment used by a fatal 1924 expedition . The scientific purpose of such a climb would be to
Wednesday, January 21, 2015 by Lydia

Science
14. The speed of sound depends on (1 point) A.the loudness of the sound. B.the pitch of the sound. C.the source of the sound.*** D.the properties of the medium it travels through
Wednesday, January 21, 2015 by jeje

Science
How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior? (1 point) A.Radioactive elements trap heat from underground magma chambers. B.Radioactive elements absorb heat from the atmosphere and release it underground.*** C....
Wednesday, January 21, 2015 by jeje

Science
Marie and Pierre Curie noticed burns on their fingers after handling test tubes containing radioactive substances. This observation led to (1 point) A.the discovery of natural fluorescence. B.the discovery of X-rays. C.the discovery of radiation therapy.*** D.the discovery of ...
Wednesday, January 21, 2015 by jeje

Science
Henri Becquerel expected to see only weak images on the photographic plate containing the uranium salt because he thought (1 point) A.fluorescent minerals needed direct sunlight to produce radio waves. B.fluorescent minerals needed direct sunlight to produce X-rays.*** C....
Wednesday, January 21, 2015 by jeje

Science
What is the principle role of a tower within a cellular system? (1 point) A.to track data usage*** B.to transmit signals C.to pinpoint locations D.to reduce line noise
Wednesday, January 21, 2015 by jeje

Science
9. FM signals travel as changes in (1 point) A.the speed of the wave. B.the amplitude of the wave. C.the frequency of the wave.*** D.the loudness of the wave.
Wednesday, January 21, 2015 by jeje

Science
8. Which of the following is true about all electromagnetic waves in a vacuum? (1 point) A.They all carry the same energy. B.They all travel at the same speed. C.They all have the same frequency. D.The all have the same wavelength.***
Wednesday, January 21, 2015 by jeje

Science
7. Which of the following correctly describes a gamma ray? (1 point) A.long wavelength and low frequency B.long wavelength and high frequency C.short wavelength and low frequency D.short wavelength and high frequency***
Wednesday, January 21, 2015 by jeje

Science
6. Sonar is used to inspect pipelines and bridge foundations. In this scenario, sonar takes advantage of the fact that (1 point) A.sound waves can reflect.*** B.sound waves can diffract. C.sound waves can spread out. D.sound waves can refract.
Wednesday, January 21, 2015 by jeje

Science
5. The pitch of the siren of a moving fire truck changes from high to low as the fire truck passes by. What property of a sound wave changes as the fire truck goes by? (1 point) A.amplitude B.density C.temperature D. frequency***
Wednesday, January 21, 2015 by jeje

Science
3. When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is (1 point) A.reflected. B.refracted. C.absorbed.*** D. Transmitted.
Wednesday, January 21, 2015 by jeje

Science
2. Soundproof rooms take advantage of which property of waves? (1 point) A.absorption*** B.regular reflection C.Refraction D.diffuse reflection
Wednesday, January 21, 2015 by jeje

Science
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength*** D.amplitude and frequency
Wednesday, January 21, 2015 by jeje

science
Pepsin,which speeds up the breakdown of protein,is classified as
Wednesday, January 21, 2015 by Lydia

Science- urgent-review
what type of galaxy do astronomers consider to be the oldest? It's urgent because I am studying for a grade 9 exam but I dont know what this is.. please help.
Tuesday, January 20, 2015 by thi

blood/science
how are blood types determined? A. marker mocules marked on red blood cells B. Marker mocules marked on white blood cells C. Plasma fibrin's precense D. Blood available for transfusion
Tuesday, January 20, 2015 by sciencemaster21212121

science
What is the blood type of a person whose plasma contains only anti-B clumping proteins? Is it blood type A?
Tuesday, January 20, 2015 by sciencemaster21212121

science
1. How does a mutation in the DNA affect the way proteins are made? A. A mutation in the DNA results in misshapen tRNA molecules that do not fit inside the ribosomes. B. A mutation in the DNA results in a change in the mRNA and, ultimately, to a different protein structure. C...
Tuesday, January 20, 2015 by Fairypenguingirl

Science
A certain species of grasshopper can have red stripes, yellow stripes, or red and yellow stripes. An RR grasshopper has red stripes, an YY grasshopper has yellow stripes, and an RY grasshopper has red and yellow stripes. Which type of inheritance is this an example of? ...
Tuesday, January 20, 2015 by Sara

maths lit,business studies,life science economics
what can i study for or what career field i should follow?
Tuesday, January 20, 2015 by karabo

maths lit,business studies,life science economics
what i can study after matric?what career field i should follow?
Tuesday, January 20, 2015 by karabo

Science
A motor car of mass 800kg traveling at 20m/s brought to rest by break over 100m calculate the average breaking force required
Tuesday, January 20, 2015 by Pboy

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