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July 24, 2014

Homework Help: Science

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Recent Science Questions

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science
Given the following reaction: CaC2 + 2 H2O C2H2 + Ca(OH)2 How many moles of Ca(OH)2 will be produced if 5.800 g of CaC2 are reacted completely?
Sunday, April 27, 2014 at 5:14pm

Science help
14. The energy role of the first organism in a food chain is always a(n) ___________. (1 point) 15. Water is a(n) __________ factor in all ecosystems that all living things require. (1 point) 16. ___________bacteria carry out the conversion of gaseous nitrogen to a ...
Sunday, April 27, 2014 at 3:35pm

Science-- Plz, Plz check my answers!!
1. Which of the following can be expected to occur as climate change continues on Earth? decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding *** 2. Which piece of children’s’ playground ...
Sunday, April 27, 2014 at 2:07pm

science: biology
The hyena is a carnivore. Justin claims that hyenas need plants to survive, but Kaden says that they don't because they only eat meat. Who is correct and why?
Sunday, April 27, 2014 at 9:27am

science
a decrease in food miles will likely increase the environmental impact of any given food points. True or false
Sunday, April 27, 2014 at 9:07am

Science
1. If the net force on an object is O N, the forces are considered unbalanced true false 2. Most people in the united states use feet and miles to measure distance in their everyday lives. why do scientist in the United States use meters to measure distance? Meters allow ...
Saturday, April 26, 2014 at 3:36pm

Science
A uniform meter scale is suspended from 40 cm mark when weight of 25 gf and 10 gf are suspended at 5 cm mark and 75cm mark respectively. Calculate the weight of the meter scale.
Saturday, April 26, 2014 at 3:23pm

Science
What are 3 limitations for modeling mitosis?
Saturday, April 26, 2014 at 11:11am

science
Why are there usually more producer in an ecosystem than consumers? a). There is less energy available to the consumers. b). There is more energy available to the consumers. My answer is ( a ).
Saturday, April 26, 2014 at 10:50am

science
When 4.56 g of a nonelectrolyte solute is dissolved in water to make 275 mL of solution at 22 °C, the solution exerts an osmotic pressure of 873 torr.
Friday, April 25, 2014 at 5:24pm

science
a 2,500 kg car at 15 m/s squared, 15 m/s squared is the what of the car?
Friday, April 25, 2014 at 4:18pm

science
what is the force that results from a 3,000 kg car accelerating at 20.00 m/s squared?
Friday, April 25, 2014 at 3:53pm

environmental science
What are some of The Blue Plains Water Advanced Wastewater Treatment Plant standards of
Friday, April 25, 2014 at 10:15am

Science
which of the following body systems does not rely on the autonomic nerve system to stimulate involuntary events?
Friday, April 25, 2014 at 12:33am

science-physics
a ray of light traveling from the air into crown glass strikes the surface at an angle of 30 degrees. what will the angle of refraction be? please help me!! don't ignore this !
Thursday, April 24, 2014 at 9:33pm

science
the role of a grizzly bear is that of a ______ because it conot make its own food.
Thursday, April 24, 2014 at 8:23pm

math
Please Help!!!!! If i spent 3 hours in homework and of that time 1/3 on math and 1/5 on science, what method could i use to solve this problem????????? Please Help Thanks!!!!
Thursday, April 24, 2014 at 7:40pm

science
What is 3.7 m/s2 in a simpler way for secondary 1 to understand
Thursday, April 24, 2014 at 7:29pm

current events
I need an article of a current event that happened at the most 6 months back. It needs to be included in the ecology category for science class. I need a title author source date who what when where why how and summary PLZ HELP ME!!!
Thursday, April 24, 2014 at 6:27pm

SCIENCE HELP! SOMEONE!
A student compared some chemical and physical properties of three pure substances. Her data are recorded in the chart above. What is a logical conclusion the student can draw about pure substances? A student compared some chemical and physical properties of three pure ...
Thursday, April 24, 2014 at 6:27pm

SCIENCE HELP!
Carl crumpled a piece of paper before throwing it into the trash can. Which is true about the paper after it was crumpled? 1. Its weight changed. 2. Its mass changed. 3. Its form changed. 4. Its density changed.
Thursday, April 24, 2014 at 6:02pm

science
how strenuous should the exercise be in order to metabolize sugar and fat in the body?
Thursday, April 24, 2014 at 5:43pm

science
1. The image above shows the Andes Mountains. Which of the following processes formed this feature? (1 point) (pic of Andes Mountains) Glaciers deposited sediment. Plates converged together to form the mountains. Plates pulled apart and released magma. Sand dunes hardened and ...
Thursday, April 24, 2014 at 3:58pm

Math
Jance spend from 7pm to 9pm doing her homework. She spend 3 times as mach time on her english project as she did on math. the science homework took twice as long as her math homework. How meny minutes did she spend on her science homework?
Thursday, April 24, 2014 at 12:52pm

science
Birds share many different characteristics. List three of these.
Thursday, April 24, 2014 at 1:39am

Science
Is Dilithium real and what can it be used for. should i go find it this cuz it is close to me.I found Dilithium unused on a craiglist ad.
Wednesday, April 23, 2014 at 10:12pm

science!
Does weight + height affect force? Please explain!! I am doing this to explain for mg science essay! I will furthermore add on to the current info.
Wednesday, April 23, 2014 at 9:16pm

computer science
IHow do you refractor this: public class Employee { private boolean isPartTime; private int seniority; private int monthsDisabled; public Employee(boolean isPartTime, int seniority, int monthsDisabled) { this.isPartTime = isPartTime; this.seniority = seniority; this....
Wednesday, April 23, 2014 at 7:14pm

science 1 question
4. How are ocean trenches formed? (1 point) Ocean trenches are formed when oceanic plate cools and moves to the surface of the ocean. Ocean trenches are formed when the denser oceanic plate sinks.*** Ocean trenches are formed when molten rock cools and solidifies. Ocean ...
Wednesday, April 23, 2014 at 6:37pm

science
A 2kg box is suspended from the ceiling by a rope that weighs 1kg.find the tension at the top of the rope?
Wednesday, April 23, 2014 at 6:13pm

SCIENCE PPPLLLLLSSSSS HELP!!!!!!!!!!
Which of the following forms when igneous rocks are weathered and eroded? (1 point) igneous rock sediment sedimentary rock metamorphic rock is it sediment or sedimentary rock!!???
Wednesday, April 23, 2014 at 5:16pm

Science
We just learned about mitosis and my teacher is giving a test over it and other things tomorrow. We have to write the mitosis steps in order, label the chomatids, nuclear membrane, spindle fibers, and centrioles, and have a sentence describing them. How could I remember this?
Wednesday, April 23, 2014 at 4:56pm

science
If Two bodies of same mass is thrown from top of a tower with same speed simultaneously.one (x) is thrown vertically downward and another(y) is thrown horizontally then what will happen?
Wednesday, April 23, 2014 at 4:15pm

science
A bat moving at 5.6 m/s is chasing a flying insect. The bat emits a 60 kHz chirp and receives back an echo at 60.63 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 338 m/s. Answer in units of m/s
Wednesday, April 23, 2014 at 3:56pm

science 1 question
7. What is the force that results from a 3,000 kg car accelerating at 20.00 m/s2? (1 point) 150.0 N 3,000 N 3,020 N 60,000 N
Wednesday, April 23, 2014 at 2:06pm

maths,science and gengraphy
what are the impacts and consequences of xenophobia
Wednesday, April 23, 2014 at 1:57pm

science
meiosis
Wednesday, April 23, 2014 at 8:01am

science
an aircraft travelling at 600km/hr accelerates steadily at 10 km /h every second. Assuming speed of sound is 100 km /h t the aircrafts altitude , how long will it take to reach the sound barrier
Wednesday, April 23, 2014 at 4:26am

science-chemistry
We performed a titration with NaOH solution with KHP. Now I need to calculate the average molarity of NaOH based on this data Weight of khp= 0.1083 g Volume of naoh = 6.4 ml Then if i get this how do i get the molarity of ch3cooh totrated in naoh with the data Volume of ...
Wednesday, April 23, 2014 at 2:31am

Science
Which of the following would increase the magnetic field around a wire? A. solenoid B. insulator C. conductor D. resistor
Tuesday, April 22, 2014 at 5:47pm

Science
How do gravitational and electrical forces act on a maglev train?
Tuesday, April 22, 2014 at 4:11pm

Science
Can someone explain center of mass in simple terms?
Tuesday, April 22, 2014 at 1:17pm

Science
1. How does sea-floor spreading occur? A. New materials are being added to the asthenosphere. B. Earthquakes brake apart the ocean floor. C. Sediments accumulate at the area of spreading. D. Molten material beneath Earth's crust rises to the surface.*
Tuesday, April 22, 2014 at 12:05pm

Science
The moon reflects sunlight...yes or no
Tuesday, April 22, 2014 at 11:12am

Science
A horizontal force 10 N is necessary to just hold a block stationary against a wall . The coefficient of friction between the block and the wall is 0.2 . The weight of the block will be ?
Tuesday, April 22, 2014 at 7:52am

science
If and iron block had a lenght of 2 cm, a width of 3 cm, and a height of 1 cm and a mass of 33 g between what two liquids would it float?
Monday, April 21, 2014 at 8:14pm

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

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