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March 4, 2015

Homework Help: Science

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Recent Science Questions

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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 at 10:42pm

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 at 10:39pm

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 at 9:49pm

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 at 9:46pm

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 at 9:14pm

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 at 8:37pm

Science
True or False Another name for chemical change is chemical bond
Thursday, January 22, 2015 at 8:35pm

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 at 8:28pm

science
Which place is most likely to have cold weather and a cold climate year-round
Thursday, January 22, 2015 at 8:24pm

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 at 8:22pm

Science
Are these equations balanced or unbalanced 1. Mg + 2HCl Yields MgCl2+H2 Balanced 2.H2+O2 Yields H2O Unbalanced
Thursday, January 22, 2015 at 8:19pm

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 at 7:34pm

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 at 5:58pm

science
how can you represent temperature in scientific terms??
Thursday, January 22, 2015 at 5:48pm

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 at 2:06pm

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 at 11:37am

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 at 11:35am

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 at 10:26am

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 at 10:25am

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 at 9:55am

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 at 3:53am

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 at 3:36am

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 at 11:32pm

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 at 11:17pm

Science
Most bacteria are A: unicellular eukaryotes B: unicellular prokaryotes C: multicellular eukaryotes D: multicellular prokaryotes Is the answer B?
Wednesday, January 21, 2015 at 11:14pm

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 at 11:03pm

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 at 10:32pm

Science
Is the gene for sickle cell anemia more likely to be dominant or recessive?
Wednesday, January 21, 2015 at 9:34pm

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 at 8:29pm

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 at 7:21pm

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 at 7:10pm

science
how many milliliters of .2 M sodium hydroxide are needed to completely neutralize 25.0g of sulfuric acid
Wednesday, January 21, 2015 at 5:46pm

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 at 4:48pm

Science
What are 5 key accomplishments of Marie and/ or Pierre Curie?
Wednesday, January 21, 2015 at 4:21pm

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 at 4:19pm

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 at 4:06pm

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 at 4:06pm

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 at 4:04pm

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 at 4:04pm

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 at 4:03pm

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 at 4:03pm

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 at 4:02pm

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 at 4:02pm

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 at 4:01pm

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 at 4:00pm

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 at 4:00pm

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 at 3:59pm

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 at 3:59pm

science
Pepsin,which speeds up the breakdown of protein,is classified as
Wednesday, January 21, 2015 at 3:49pm

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 at 6:47pm

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 at 5:07pm

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 at 4:55pm

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 at 4:24pm

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 at 4:20pm

maths lit,business studies,life science economics
what can i study for or what career field i should follow?
Tuesday, January 20, 2015 at 2:00pm

maths lit,business studies,life science economics
what i can study after matric?what career field i should follow?
Tuesday, January 20, 2015 at 1:52pm

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 at 12:50pm

Science
A sample of steam with a mass of 0.530g and at a temperature of 100 ∘C condenses into an insulated container holding 4.40g of water at 5.0∘C.( ΔH∘vap=40.7 kJ/mol, Cwater=4.18 J/g⋅∘C). What is the final temperature of the mixture, assuming no ...
Tuesday, January 20, 2015 at 10:01am

SCIENCE
IF THERE WAS A ZERO CHANGE IN EARTHS ECCENTRICTY, HOW MIGHT THAT AFFECT THE POSSIBILTY OF AN ICE AGE/
Tuesday, January 20, 2015 at 9:08am

science
A soccer player applies an average force of 180 N during a kick. The kick accelerates a 0.45 kg soccer ball from rest to a speed of 18 m/s. What is the impulse imparted to the ball? What is the collision time?
Tuesday, January 20, 2015 at 5:58am

Science
3. Describe how the Triassic period was a transitional time period during the Mesozoic era. Explain why the boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods NEED ANSWER FOR PRINCESS ANNA!!! She posted this ...
Tuesday, January 20, 2015 at 2:01am

Earth Science
4.   Which statement best describes an igneous intrusion?       A. Magma is injected into surrounding rock forming an igneous intrusion.  B. Magma explodes to the surface and forms a smooth outer layer of rock.&...
Monday, January 19, 2015 at 8:51pm

Earth Science
1.   What measurement best describes the results of a scientific experiment regarding distance?  A. 57 miles B. 500 kilograms C. 523 inches D. 51 kilometers     ​ My answer is D. Am I correct?  &...
Monday, January 19, 2015 at 6:49pm

Science
In the experiment water clock : what changes (independent variable) , how does it responds to the changes made(dependent variable), and what is being controlled (controlled variable). Pleas I really need this by today. And also my question for science fair is what part does ...
Monday, January 19, 2015 at 6:35pm

Earth Science - Please Check My Answer
Please help me with the following question: Please select the word from the list that best fits the definition Creates clouds, snow, sleet, rain and hail A. Radiation B. Conduction C. Convection D. Water Cycle I think the answer is mostly B, but I think it could be D as well. ...
Monday, January 19, 2015 at 6:34pm

SCIENCE
1. An environmental engineer might (1 point) Create mathematical models of what may happen to global temperatures in the future. Build and maintain a marine exhibit for an aquarium. Help an oil finery reduce its toxic gas emissions.*** Stock a lake with algae-eating fish. 2. ...
Monday, January 19, 2015 at 5:02pm

physical science
a diagram to show the maximum and minimum resultants
Monday, January 19, 2015 at 4:30pm

Science
Is "how did our planet form" a scientific question?
Monday, January 19, 2015 at 3:54pm

Science
How does cell differentiation connect to other branches of science or STEAM (science, technology, engineering, art, mathematics)
Monday, January 19, 2015 at 3:17pm

SCIENCE
1. An environmental engineer might (1 point) Create mathematical models of what may happen to global temperatures in the future. Build and maintain a marine exhibit for an aquarium. Help an oil finery reduce its toxic gas emissions. Stock a lake with algae-eating fish. Is it A...
Monday, January 19, 2015 at 2:38pm

Gen Science 2
lightning is actually an enormous display of the concept of? A) chemical heating B) solar energy C) magnetism D) groundind
Monday, January 19, 2015 at 2:23pm

science
How many litres of oxygen are needed to react completely with 25.0L of H2S at STP according to the following reaction: 2H2S + 3o2 --> 2so2 + 2H2O At STP temperature is 273 K pressure is 101.3 Kpa R is 8.314 so PV=nRT 101.3×25= n× 8.314× 273 n= 1.11 so ...
Monday, January 19, 2015 at 1:36pm

Science
How could genetic engineering of plants be useful to people? Give examples
Monday, January 19, 2015 at 12:20pm

Science
DNA can perhaps best be compared to a(n) A. secret code or B. electrical circuit
Monday, January 19, 2015 at 11:59am

Science
What are the different evidences used to support the continental drift theory? Give at least four and provide examples for each.
Monday, January 19, 2015 at 6:24am

Science, Chemistry
2) Find the temperature at which air posses a density equal to that of hydrogen at 0°C. Density of air at STP is 14.4. Ans: 3658.2 °C.
Monday, January 19, 2015 at 5:17am

SCIENCE
An arrow is fired vertically up lands 8 seconds later.Find: [ A] Its maximum height. [B] Its initial speed.
Monday, January 19, 2015 at 1:35am

Science/engineering
What part does gravity play in the function of the water clock? Explain.
Sunday, January 18, 2015 at 8:15pm

Physical Science
how do i find the number of molecules in a packet of sweetners (splenda, equal, sweet & low).
Sunday, January 18, 2015 at 8:12pm

Physical science
Is a chemical reaction the same as a chemical change i need to know so that i can plug it in to answer a question
Sunday, January 18, 2015 at 4:22pm

science
explain an animal cell in your own words and two things each part does
Sunday, January 18, 2015 at 2:06pm

science
when will the resultant of the two vectors be at a maximum
Sunday, January 18, 2015 at 11:00am

Life science,history,geography,math literacy
Is it possible to become a law while you are doing those subject
Sunday, January 18, 2015 at 10:31am

Science
guys, please give me any ideas for a investigatory project in physics ???
Saturday, January 17, 2015 at 9:14pm

Science
Please help me to solve this equation. Than you for your time and efforts. Here is the question? Jupiter at its closest approach to earth is about 630,000,000 kilometers, the diameter of Jupiter is 140,000 km, calculate the angular diameter of Jupiter in arc seconds. 206,265 ...
Saturday, January 17, 2015 at 4:24pm

science
Which constellations are visible from Canada in all seasons?
Saturday, January 17, 2015 at 3:23pm

science
please draw an atomic diagram showing electrons in different energy levels LI + N = MG + F = NA + F = AL + O = LI + O = K + S = MG + O =
Saturday, January 17, 2015 at 1:43pm

Physical science
Two forces of 5N and 7N respectively act on an object. When. will the resultant of the two vectors be at a maximum?
Saturday, January 17, 2015 at 11:43am

physical science
two force of 5n and 7n respectively act an object , when will the resultant of the two vectors be at a maximum
Saturday, January 17, 2015 at 10:03am

Math literacy,physical science,CAT,life science
Can I still be a doctor without pure Maths?
Saturday, January 17, 2015 at 4:34am

Psychology
If science depends on observation of empirical data, how can social scientists study nonobservable phenomena, such as thought patterns or imagery?
Friday, January 16, 2015 at 10:59pm

statistics
In a class of 100 students, 30 are computer science majors, 49 are mechaincal engineering majors, 13 are civil engineers and the rest are general engineering majors. Assume students only have one major. If a student is chosen at random what is the probability they are: a civil...
Friday, January 16, 2015 at 9:23pm

Science
The rock cycle suggests that A)rocks are always added to Earth's mass. B)rocks are continuously being recycled into different forms. C)rocks disappear from Earth as they go underground. D)rocks always stay in the same form. My answer is A... is that right??
Friday, January 16, 2015 at 3:20pm

Science
A ball slowing down as it rolls across a carpet is an example of A. Balances force. B. Friction C. Interia D. Zero net force Is the answer B? Thank you
Friday, January 16, 2015 at 1:53pm

Science
A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces acting on the ball. True False Is the answer False? Thank you
Friday, January 16, 2015 at 1:40pm

science
Which cells identify as the ones most likely to hold the key to increased human longevity and vitality and how might this work? Describe one alternative to cloning
Friday, January 16, 2015 at 9:59am

science
What are some arguments against extending human life? Please describe at least one objection and one objection from your research and experience.
Friday, January 16, 2015 at 9:42am

SCIENCE
From the following data ,calculate the percentage of KCl in sample of chloride weight of the sample 0.1865, volume of AgNOS required 26.50mL and Ag of AgNO3 =0.008700gram
Friday, January 16, 2015 at 2:50am

science
a box weighs 200 N. If you push on the box with a force of 15 N and the box does not move, how much work did you do? A) 0 J B) 15 J C) 15 N or D) 3000J
Friday, January 16, 2015 at 12:22am

Science (Chemistry)
Identify the manipulated and responding variables in this testable question: "Does orange juice transform from a solid to a gas at the same exact rate as water?" My question is, what will you be changing in this lab (MV) and what are you measuring (RV)?
Thursday, January 15, 2015 at 10:03pm

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