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November 28, 2014

Homework Help: Science

Branches of Science

Recent Science Questions

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Science
Plant Cell Analogy Cell Membrane: Security Nucleus: Boss Mitochondria: Food court Cytoplasm: Chromosomes: Vacuole: Water Ribosomes: Food Cell wall: Endoplasmic Reticulum: Chloroplasts: Golgi Appartuas: Packer What could the others be?
Monday, April 21, 2014 at 6:41pm

Radioactivity or science
A radioactive isotope source has a mass of 120ug. If the isotope had a half life of 20s, what would be the mass if the isotope after 2 mins?
Monday, April 21, 2014 at 5:15pm

Science
Plant Cell Analogy Cell Membrane: Security Nucleus: Boss Mitochondira: Food court Cytoplasm: Chromosomes: Vacuole: Water Ribosomes: Food Cell wall: Endoplasmic Reticulum: Chloroplasts: Golgi Appartuas: Packer What could the others be?
Monday, April 21, 2014 at 4:48pm

Science
How many cell divisions would it take to produce at least 1,000 cells from one cell? (When one cell splits in half during cell division, the result is two new cells. Each of those cells can divide into two more and so on.) Answer (256?)
Monday, April 21, 2014 at 4:11pm

statistics
discuss the contribution of computer in the development of science and technology
Sunday, April 20, 2014 at 5:33am

Science
What is the main benefit of using scientific names instead of common names for organisms?   Scientific names have been around for much longer than common names have. Scientific names give everyone a shared terminology while common names can vary around the world. ...
Friday, April 18, 2014 at 11:37pm

science
Water is flowing in a pipe as depicted in the figure. As shown, p = 113 kPa, d = 4.57 cm, d' = 3.22 cm, v = 4.40 m/s, and h = 1.25 m. What pressure is indicated on the upper pressure gauge? Take y = 0 at the bottom of the left pipe so that the center of the left pipe is y1...
Friday, April 18, 2014 at 3:39pm

science
explain the Eutectic and Eutectoid reaction in cast irons
Friday, April 18, 2014 at 12:43pm

sociology
Miranda has a theory that some people are able to “see the future.” She has tested this theory and found that she is unable to produce an individual with above chance predictions. She revises her theory to explain that when asked about the future, these people are ...
Friday, April 18, 2014 at 11:57am

Science
How does DNA get passed from one generation to the next?
Friday, April 18, 2014 at 11:16am

TO ANY SCIENCE HELPER
Like say my question was a sample has 80% of its original carbon-14 present. How do I determine the age of the sample? Like I don't get how to get the answer, this concept is very difficult for me
Thursday, April 17, 2014 at 11:21pm

TO ANY SCIENCE HELPER
I honestly don't get how to use radioactive dating to determine the age of a sample. I need an example and what to do in order to get the answer. I need it to be step by step. Thank u so much :)
Thursday, April 17, 2014 at 8:48pm

science
If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called?
Thursday, April 17, 2014 at 4:51pm

science
if you wanted to consult the geologic time scale for when the first vertebrates evolved, where would you look?
Thursday, April 17, 2014 at 3:03pm

Math
Two kids are building a rocket for science class. once the rocket is launched its height in feet, h(t) can be found using the function h(t)=-16t^2+128t where t represents time in seconds. They record the time from the moment the rocket launches until it falls to the ground. (...
Thursday, April 17, 2014 at 12:31pm

science
What are psychoanalytical models? How have these models been used to explain human behavior? Which model do you feel is the most effective in explaining human behavior? Why?
Thursday, April 17, 2014 at 12:47am

Science
In pea plants, which color is dominant green or yellow?
Wednesday, April 16, 2014 at 10:01pm

Chemistry - Science (Dr. Bob222)
Consider the kinetic data given in the table below for the first order reaction: What is the value of the activation energy? A_2_--> 2A Expt. Initial [A2] Temp. Initial Rate mol/L (°C) [A2]·s–1 1 0.10 100 1.2 x 10–3 2 0.20 200 4.8 x 10–3 3 0.15 ? 4...
Wednesday, April 16, 2014 at 7:18pm

science
Alfredo, who has a mass of 60 kilograms, jumped off a retaining wall. His kinetic energy when he landed on the ground was 822 joules. How high was the wall?
Wednesday, April 16, 2014 at 7:05pm

Chemistry - Science (Dr. Bob222)
Consider the kinetic data given in the table below for the first order reaction: What is the value of the activation energy? A_2_--> 2A Expt. Initial [A2] Temp. Initial Rate mol/L (°C) [A2]·s–1 1 0.10 100 1.2 x 10–3 2 0.20 200 4.8 x 10–3 3 0.15 ? 4...
Wednesday, April 16, 2014 at 7:02pm

Science
zinc is mixed with Hydrochloric acid to form zinc chloride and hydrogen gas. if 7.3 grams of zinc completely reacts how much hydrogen gas will be created? if you collect the hydrogen over water at 23 degrees celcius and a barometric pressure of 770 mmHg and you recover 2.30 ...
Wednesday, April 16, 2014 at 4:37pm

Science URGENT help please
Piano movers hoist a 200 kg piano 10 m high in 30 s using a rope and simple pulley. What is their power output? (Points : 1) 70 W 700 W 7,000 W 6 × 10^5 W
Wednesday, April 16, 2014 at 12:50pm

science
how does the amount of daylight in the summer compare to the amount of daylight we have in the winter?
Tuesday, April 15, 2014 at 9:31pm

Science
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, April 15, 2014 at 9:11pm

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

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