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September 19, 2014

Homework Help: Science

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Recent Science Questions

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Science
Which of the following is the best example of transforming electromagnetic energy into thermal energy? A.when trees absorb sunlight for photosynthesis B.when the interior of a car absorbs sunlight and warms up C.when a solar panal absorbs sunlight to make electricity D.when a ...
Tuesday, April 15, 2014 at 7:53pm

science
Shoe companies imbed unique designs on the bottoms of the sneakers they manufacture.What is the main purpose of the designs on the bottoms of sneakers? A.to increase potential energy B.to decrease friction C.to increase friction D.to decrease potential energy Please Help!!!!!!!
Tuesday, April 15, 2014 at 7:33pm

science
why does an person in space craft orbiting earth experiance a feeling of weightless?
Tuesday, April 15, 2014 at 6:07pm

science
Find the angular and linear velocities of a man due to the rotation of the earth if he standing A) at the equator B) in Muscat(latitude23.5) C) in oslo(latitude60) Take tha radius of the earth as 6380km
Tuesday, April 15, 2014 at 4:43pm

science
A car driver accelerates to a speed of 35 mph and then takes her foot off the pedal. Even though she does not press the brake pedal at any time, she eventually rolls to a stop. What causes that?
Tuesday, April 15, 2014 at 11:09am

science
Which of the following determine how long a star remains on the main sequence Answer Are MASS TEMPERATURE BRIGHTNESS ALL ABOVE THANK YOU
Monday, April 14, 2014 at 10:51pm

science
An H-R diagram? Answer Are Is a map of the position of the stars Graphs stars according to their size and distance List every known star Graphs a sample of stars according to surface temperature and absolute brightness Thank You
Monday, April 14, 2014 at 10:02pm

Science -Check Answers- Please
1.) How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together. ******** C. They cooled and pulled ice together. D. They began to rotate. 3. Which of the following statements about features on the sun is true? A. Prominences...
Monday, April 14, 2014 at 9:00pm

math, science
a vertical shaft 150mm in diameter rotating 100r.p.m resrs on a flat end foot step bearing.the shaft carries a vertical load of 20kN assuming uniform pressure distribution and coefficient equal to 0.05, estimate power lost in friction
Monday, April 14, 2014 at 6:32pm

science
In the formation of the solar system nearly all of the mass of the solar nebula became ? Answer Are Terrestrial planets GAS giant SUN OORT CLOUD THANK YOU
Monday, April 14, 2014 at 1:20pm

Science
a bomb of 5 kg explodes into two equal fragments. At what angle, these fragments fly apart?
Monday, April 14, 2014 at 8:54am

Chemistry - Science (Dr. Bob222)
Consider reaction below: 50H3O^+(aq) + 7Cr2O7^2-(aq) +3I_2(aq) --> 6IO_4^-(aq) + 14Cr^3+(aq) + 75H2O (l) How many electrons are transferred in this reaction?
Monday, April 14, 2014 at 6:00am

Science radioactivity
why are alpha and beta radiation referred to as particles while gamma radiation is referred to as rays?
Monday, April 14, 2014 at 12:12am

Science
A 3.4g sample of h2o2 solution containing x% H2O2 by mass requires x ml of a KMnO4 solution for complete oxidation under acidic condition. the molarity of kmno4 solution is: a)1 b)0.5 c)0.4 d)0.2
Sunday, April 13, 2014 at 11:14pm

Chemistry - Science (Dr. Bob222)
At 25 degree C, a student adds 0.400 g of solid phosphoric acid to a beaker containing 500.0ml of water. After the solid is completely dissolved the student adds 20.0ml of a 0.995M sodium hydroxide. What is the pOH of the solution in the beaker?
Sunday, April 13, 2014 at 8:04pm

science
If you were riding on a train, which of the following would look as if it is not moving? the conductor walking by you a building you are passing a flying bird<---- a person sitting next to you Which of the following reference points would allow you to observe the speed of a...
Sunday, April 13, 2014 at 6:06pm

physical science
a ship is 850 m from a vertical cllff the ship sireN IS SOUNDED AN ECHO IS HEARD AFTER 5 SECOND CALCULATE THE SPEED OF THE SOUND FROM THE SIREN OF THE SHIP
Sunday, April 13, 2014 at 4:44pm

Ethics in Criminal Justice
If we eliminate free will completely, we would also be eliminating: A. the possibility of genetic bases for human behavior. B. The value of modern science. C. Moral responsibility. D. Excuses for criminal conduct.
Sunday, April 13, 2014 at 2:39pm

science
The volume of 3.96 g of a gas sample at standard conditions it was found to be 1.15 L.Calculate its molecular mass?
Sunday, April 13, 2014 at 1:49pm

Science
A homeowner determined that he used 114 gallons of oil every month to heat his home during the winter. This information would be considered part of his _______________________________. Idk this one please help!!!
Sunday, April 13, 2014 at 1:02pm

SCIENCE
To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ ...
Sunday, April 13, 2014 at 12:49pm

Science
what do you call it when there are few living things in an area? Extinguish?
Sunday, April 13, 2014 at 12:19pm

Science
Problem: What are parts of a cell and how are animal cells different from plant cells? Hypothesis: Can someone help me get a hypothesis?
Sunday, April 13, 2014 at 9:22am

science
why do people have a hard time moving a large rock out of the road
Sunday, April 13, 2014 at 7:26am

science
what animal would have less momentum then a 52 kg cheetah running at 10 m/s.
Sunday, April 13, 2014 at 7:15am

science
what is the momentum of a 20kg scooter traveling at 5.o m/s.?
Sunday, April 13, 2014 at 7:10am

science
Ethanol can also be manufactured from glucose, C6H12O6. C6H12O6 2CO2 + 2C2H5OH. A solution containing 18 kg of glucose makes only 0.92 kg of ethanol. Calculate the percentage yield of ethanol.
Sunday, April 13, 2014 at 12:13am

science
Amount of force =52pascal,pressure =13newton,find the area.
Saturday, April 12, 2014 at 11:58pm

3 questions~~~
1. What does the term "fair-use exception" mean? (1 point) to use only material that has never been published the ability to use material made by others for educational purposes an exception to copyright restrictions for images only Educational material is no longer ...
Saturday, April 12, 2014 at 7:35pm

Sociology
If Andrea's parents have her take violin lessons, take a foreign language and attend science camp in hopes of her developing skills so she can get into a competitive college, is that an example of human capital or cultural capital? I was leaning towards human capital but ...
Saturday, April 12, 2014 at 4:52pm

Science help!!!!
A______________________ is a tool used to capture the energy in sunlight. Recycling aluminum cans and taking shorter showers are two ways to practice the ________________________ of natural resources. Some plastics are made from corn. These plastics are biodegradable. This ...
Saturday, April 12, 2014 at 3:50pm

science
Identify and discuss the main safety legislation applicable to the installation, commissioning operating and maintaining the tube swaging machine.
Saturday, April 12, 2014 at 9:55am

Life science, tourism, geography, and maths litera
what careers can i do with this subject
Saturday, April 12, 2014 at 12:34am

World Civilization
1. In 1789, the National Assembly revoked the privileges of the aristocracy. This occurred in reaction to A. a peasant uprising. B. Louis XVI's withdrawal of troops from Paris. C. discontent among the poor people of Paris. D. the storming of the Bastille 2. What was ...
Friday, April 11, 2014 at 5:14pm

World History
1. In 1964, a loose union of Palestine refugees led to the formation of the Palestine Liberation Organization (PLO) under Yasir Arafat. What was the aim of the PLO? A. Driving Israel from East Jerusalem B. Establishing a Pan-Arab League C. Evicting Israel from Palestine D. ...
Friday, April 11, 2014 at 4:56pm

Science help!?
. If a kestrel eats a mouse that eats grass, the kestrel is a (1 point)producer. second-level consumer. first-level consumer. decomposer. 2. Which of the following best explains why a species of lizard is able to live in the desert but not in tundra regions? (1 point)High ...
Friday, April 11, 2014 at 4:53pm

Science
Problem: What are parts of a cell and how are animal cells different from plant cells? Hypothesis: Can someone help me get a hypothesis?
Friday, April 11, 2014 at 2:42pm

science
what is the momentum of a 20.0 kg scooter traveling at 5.00 m/s?
Friday, April 11, 2014 at 1:34am

Chemistry, Science
Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the precipitate redissolves ...
Thursday, April 10, 2014 at 9:33pm

Science
Your are studying an evergreen tree that produces cones. The tree is an? -Angiosperm -Gymnosperm -Gametophyte -Monocot
Thursday, April 10, 2014 at 5:33pm

science
When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium acetate solution in order to bring its pH to the target value of 5.00.
Thursday, April 10, 2014 at 3:38pm

Science
Explain how gravitational, electrical, and magnetic forces act on a maglev train?
Thursday, April 10, 2014 at 12:33pm

science
Resultant of 2 vectors P and Q is inclined at 30 either of them. What is the magnitude of resultant vector?
Thursday, April 10, 2014 at 3:35am

science
Resultant of 2 vectors P and Q is inclined at 45 either of them. What is the magnitude of resultant vector?
Thursday, April 10, 2014 at 3:34am

science
Resultant of 2 vectors P & Q is inclined at 45 to either of them. What is the magnitude of resultant vector?
Thursday, April 10, 2014 at 3:32am

Science
A television contains a receiver that accepts visual and audio signals. True
Wednesday, April 9, 2014 at 9:39pm

Science
One pixel represents A.) A temperature range of 10-15 degrees. B.) A wind speed of 10 kilometers per hour. C.) A land area of 30 by 30 meters. D.) Various colors depending on their size. I think it is D. Thank You.
Wednesday, April 9, 2014 at 6:24pm

science
which is the good conclusion for verifiying the conserved linear momentum in a similated collision
Wednesday, April 9, 2014 at 4:43pm

Science
Explain some modifiable risk factors as well as some actions you can take to avoid dying from a lifestyle disease.
Wednesday, April 9, 2014 at 4:43pm

science
which is the good conclusion for verifiying the conserved linear momentum in a similated collision
Wednesday, April 9, 2014 at 4:40pm

Science
Suppose you make an electromagnet with a copper wire and a battery by putting the two ends of the wire on the two ends of the battery. If you switch the side of the battery, are you changing the magnetic poles of the wire?
Wednesday, April 9, 2014 at 4:38pm

Science
How do lifestyle diseases differ from other diseases?
Wednesday, April 9, 2014 at 4:32pm

Science
What happens to resistance when voltage increases but current is constant?
Wednesday, April 9, 2014 at 1:55pm

SCIENCE PLEASE HELP ME!!!!!!!! ASAP PLEASE PLEASE
Which chemical equation is balanced? (1 point) H20 H2 + 2O2 2H20 2H2 + O2 2H2O H2 + 2O2 H20 2H2 + 2O2 i think its c
Wednesday, April 9, 2014 at 12:22pm

Science
Sports teams always have instant cold packs stored in their first aid kits. Two chemicals are separated by a barrier inside the bag. Based on what you now know, explain how this cold pack gets cold without ice and what type of reaction is formed here? Please help! I do not ...
Wednesday, April 9, 2014 at 11:47am

science
In humans, being a tongue roller (R) is dominant over non-roller (r). A man who is a non-roller marries a woman who is heterozygous for tongue rolling. what is the Father's genotype, mother's genotype?
Wednesday, April 9, 2014 at 5:43am

science
The primary color of pigments ANSWER ARE Are the same as the secondary color of light Combine in equal amount to produce black All of above Thank You
Wednesday, April 9, 2014 at 12:10am

Science
What energy change occurs during condensation?
Tuesday, April 8, 2014 at 7:07pm

science
Describe DNA replication in prokaryotes. Include the major steps for origins of replication, unwinding DNA, and synthesis of new strands. Include at least 1 simplified diagram.
Tuesday, April 8, 2014 at 4:59pm

science
Using your knowledge of physiology, genes and evolution, discuss organism adaptations to the environment using clear and specific examples.
Tuesday, April 8, 2014 at 4:59pm

science
22. Given that humans thermoregulate, explain why your skin is cooler than your body core.
Tuesday, April 8, 2014 at 4:58pm

HELP!!! SCIENCE!!!
What are three key accomplishments of Marie and/or Pierre Curie?
Tuesday, April 8, 2014 at 4:17pm

Language Arts ~CHECK MY ANSWERS~
Are these answer are correct? Please be 100% correct / honest. Directions: For questions 7–15, rewrite each sentence, adding commas where needed. 7) While I was researching skateboards, I found an interesting old newspaper. 8) In the June 29, 1999 edition of the Mercury ...
Tuesday, April 8, 2014 at 4:06pm

science
A wave has a wavelength of 10mm and a frequency of 5 hertz what is the speed Answer Are 55 mm/s 50 hertz 2 mm/s thank you
Tuesday, April 8, 2014 at 2:53pm

Science Help????????????????
. A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? • frequency and wavelength • amplitude and wavelength • amplitude and frequency . Soundproof rooms take ...
Tuesday, April 8, 2014 at 2:51pm

Science Help PLEASE!! FAST
1. What happens to the levels of surface water and groundwater during a drought? Surface water and groundwater levels increase during drought. Surface water and groundwater levels decrease during drought. There is no change in the levels of surface water and groundwater during...
Tuesday, April 8, 2014 at 2:14pm

Science
Hey guys! If you could help me with a few of these question (they are fill in the blanks), that would be much appreciated. 1. Fertilizers and pesticides pplied to farm fields in Pennsylvania have made their way down into the Chesapeake Bay in Maryland. This is an example of ...
Tuesday, April 8, 2014 at 2:04pm

science
Compare and contrast gametogenesis in human males and females.
Tuesday, April 8, 2014 at 12:51pm

science
Describe DNA replication in prokaryotes. Include the major steps for origins of replication, unwinding DNA, and synthesis of new strands. Include at least 1 simplified diagram.
Tuesday, April 8, 2014 at 12:50pm

science
discuss organism adaptations to the environment using clear and specific examples.
Tuesday, April 8, 2014 at 12:50pm

science
Given that humans thermoregulate, explain why your skin is cooler than your body core.
Tuesday, April 8, 2014 at 12:50pm

Science
Refrigerators requires a lot of electricity and uses the most electrical energy in most households. Why do refrigerators require so much energy to be operated?
Tuesday, April 8, 2014 at 12:45pm

Science
In a(n) ___, the particles form a regular, repeating pattern. Answerlist: viscous liquid melting liquid amorphous solid or crystalline solid
Tuesday, April 8, 2014 at 4:39am

Science
Please Check my Work:pls check my work asap! 1. A ___ has a definite shape and a definite volume. (1 point) 1. solid (My Choice) 2. liquid 3. gas 4. molecule 2. Why is a gas able to flow? (1 point) 1. Its particles have melted and can move around. 2. Its particles have high ...
Tuesday, April 8, 2014 at 4:26am

science
a 1.0 kg metal head of a geology hammer strikes a solid rock with a speed of 3.9 m/s. assuming all the energy was retained by the hammer head, how much will its temperature increase?
Tuesday, April 8, 2014 at 12:35am

Science
Because we can't see through a gas cloud, we would not use optical telescopes which collect visible light to form images of stars inside a gas cloud. Which type of telescope would we use to study new stars inside the giant gas cloud and why? My thoughts are Infrared and ...
Monday, April 7, 2014 at 10:54pm

Science
Optical telescopes are designed to collect and create images from: A. White or visible light**** B. x-rays C. infra red radiation D. gamma rays My answer is A???? Thank you in advance
Monday, April 7, 2014 at 10:51pm

Science
Astronomers believe that background radiation is left over noise from the big bang. This noise can be collected and studied using a RADIO telescope. my answer: radio
Monday, April 7, 2014 at 10:50pm

Science
A gas sample in a sealed vial originally at 0.6 atm and 300 K, was heated to 450 K. What other property of the gas has changed? What is the value of this property after heating?
Monday, April 7, 2014 at 10:22pm

Single Room, Earth View by Sally Ride--Help!
This regards the story "Single Room, Earth View" by Sally Ride. Choose one of the following quotations; then in a few paragraphs, discuss how Sally Ride's observations support or refute the quotation. Quotations: 1. "Observation is a passive science, ...
Monday, April 7, 2014 at 10:07pm

Science
a) How much lime and what volume of CO2 at NTP will be obtained from 10 kg of limestone? b) How much ferrous sulphide will be required to obtain 1.12 g of gas at NTP by chemical reaction between ferrous sulphide and very dil.Sulphuric acid?
Monday, April 7, 2014 at 8:45pm

science/math
1. A light ray strikes a mirror at an angle of 42° from the surface of the mirror. What angle does the reflected ray make with the normal Ans. 42° 2. A ray of light hits a mirror at 27° from the normal. What is the angle between the reflected ray and the normal. ...
Monday, April 7, 2014 at 8:08pm

Science
explain how a microclimate can affect crop production I need someone to explain this to me because i don't get it
Monday, April 7, 2014 at 6:52pm

Science
Describe how a large water body can affect the amount of snowfall a region receives in the winter.?
Monday, April 7, 2014 at 6:11pm

Science
Use Newton’s first law of motion to explain how wearing a seat belt in a moving car could help prevent injury.
Monday, April 7, 2014 at 4:57pm

Science
You are given 10 µL of a DNA stock solution that has 1.0 µg target DNA/µL. The target DNA molecule is 2.9 kb in length. Describe a set of serial dilutions that would yield a standard curve with the following concentrations: 2 x10^7 copies/µL, 2x10^6 ...
Monday, April 7, 2014 at 4:34pm

Science
1.) Use Newton’s first law of motion to explain how wearing a seat belt in a moving car could help prevent injury. 2.) 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 ...
Monday, April 7, 2014 at 3:53pm

Science - Check my answers please (6th grade)
When are tides in Earths oceans the highest? 1. during the moon's waning gibbous phase 2. during the moon's waxing gibbous phase 3. when the moon is at a right angle to the sun 4. When the sun, Earth, and moon are in a line.
Monday, April 7, 2014 at 12:50pm

Science
Refrigerators requires a lot of electricity and uses the most electrical energy in most household. May anyone tell me why it is so expensive to operate?
Monday, April 7, 2014 at 12:03pm

Science - Check my answers please (6th grade)
earth and the moon are kept in their respective orbits due to the influence of ? a) inertia b) gravity c) both inertia and gravity d) neither inertia and gravity Is it c) both inertia and gravity?
Monday, April 7, 2014 at 11:41am

science
In cat, the gene for black coat is dominant to the gene for white coat. A heterozygous black cat is crossed with a white cat. which of the following is true about the ratio of the offspring from the cross? Black coat, White coat A. 1,3 B. 3,1 C.4,1 D.4,0 can you please give me...
Monday, April 7, 2014 at 3:56am

Science
Please help !! Look at my other question on science plzzzzzzzzzzzz
Sunday, April 6, 2014 at 10:41pm

Science
When did Gregor Mendel publish his results ? When did people notice how important his work was ?
Sunday, April 6, 2014 at 10:25pm

science
Im researching a disease caused by a cellular organelle that does not function properly. My topic is "cardiamuscle disease" and its organelle is the cytoskeleton. Ive searched google but cant seem to find a website to help me begin
Sunday, April 6, 2014 at 9:38pm

science
What Develop hypotheses would you predicting the efficiency of solar energy from direct sunlight against the 4 variables tested?
Sunday, April 6, 2014 at 8:13pm

Physical Science
13. Why can convex mirrors only produce virtual images? Sadly, I can't find this answer in my book. :( Any help would be appreciated, please and thank you!
Sunday, April 6, 2014 at 6:27pm

science -heredity
there are about 100,000 genes in each cell. Why would it be important scientists to identify what every one of these genes does? I put Genes will describe a trait of a person, example, it will determine if a person will be small or tall; blue or brown eyes and brown or blond ...
Sunday, April 6, 2014 at 6:14pm

Science
What are ten observations made by Charles Darwin on his voyage and what are their significance?
Sunday, April 6, 2014 at 4:57pm

Science
How many mole of magnesium atoms are present in 0.50g of manesium (mg=24)
Sunday, April 6, 2014 at 2:06pm

science
2. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1? Explain how you determined this.
Sunday, April 6, 2014 at 8:17am

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