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July 26, 2014

Homework Help: Science

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Recent Science Questions

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Science
What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?
Friday, October 25, 2013 at 3:22pm

Science
A 400 kg. wooden log is floating with 0.2 of its volume above water level. Given that the density of iron is 7.8 gram per centimeter cubic, calculate the least mass of iron object attached to the underside of log that will sink it.
Friday, October 25, 2013 at 1:45pm

science
1. A dog is trained to sit and shake hands. These traits are most likely. (1 point) A. inherited B. not inherited C. not acquired D. innate 2. In a particular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that ...
Friday, October 25, 2013 at 9:50am

science linear prog
A small farm in Illinois has 110 acres of land available on which to grow corn and soybeans. The following table shows the cultivation cost per acre, the labor cost per acre, and the expected profit per acre. The column on the right shows the amount of money available for each...
Friday, October 25, 2013 at 6:28am

science linear equation
A theater is presenting a program on drinking and driving for students and their parents. The proceeds will be donated to a local alcohol information center. Admission is $18 for parents and $9 for students. However, this situation has two constraints: The theater can hold no ...
Friday, October 25, 2013 at 6:26am

Computer Science
Suppose X is a random variable and Y = aX + b is a linear function of X. Show that the correlation of X and Y is 1 if a < 0.
Friday, October 25, 2013 at 6:21am

science
30 ml KMnO4 solution is required to titrate 25 ml M/50 oxalic acid solution.find the molarity of KMnO4 solution and g/L also.
Friday, October 25, 2013 at 5:18am

science
On average, froghopper insects have a mass of 12.3 mg and jump to a height of 428 mm. The takeoff velocity is achieved as the little critter flexes its leg over a distance of approximately 2.0 mm. Assume a vertical jump with constant acceleration. How long does the jump last (...
Friday, October 25, 2013 at 1:57am

science
On average, froghopper insects have a mass of 12.3 mg and jump to a height of 428 mm. The takeoff velocity is achieved as the little critter flexes its leg over a distance of approximately 2.0 mm. Assume a vertical jump with constant acceleration. How long does the jump last (...
Friday, October 25, 2013 at 1:56am

college physics
My previous question was marked science, but it's specifically a college physics question. Thanks.
Friday, October 25, 2013 at 12:09am

science
I am still new to physics, so I'm having a rough time. When a 1kg metal pan containing 1kg of cold water is removed from a refrigerator onto a table which absorbs more heat from the room, the pan or the water? I thought it was the water, because I thought I read that water...
Friday, October 25, 2013 at 12:05am

Science ms sue please help
True or false during dry weather the water level in a small pond drops because of runoff. I think it's true but I'm not sure And in the water cycle water returns to earth as condensation usually in the form of rain or snow. Is that true? And when water vapor leaves it ...
Thursday, October 24, 2013 at 6:29pm

science
fill in the blank. Contact lenses improve lives. Contact lenses are an example of a(n)__________ .
Thursday, October 24, 2013 at 1:13pm

earth science
A heterogeneous mixture is a
Thursday, October 24, 2013 at 3:16am

Science: Fluids in motion
I'm just currently reading my science book and I just thought of a few questions.. Why are water molecules have a high attraction of glass? And why are their adhesion higher than their cohesion?
Thursday, October 24, 2013 at 2:38am

Physical Science ASAP
A child weighing 200 newtons is sitting in the center of a swing. the swing is supported evenly by two ropes, one on each side. what is the tension force in one of the ropes?
Wednesday, October 23, 2013 at 10:24pm

Science
A classmate states that igneous rock must always become sedimentary rock next , according to the rock cycle .explain why this statement is not correct
Wednesday, October 23, 2013 at 10:23pm

Science
Suppose that 9 grams of a certain substance lost 17.5 calories of heat when the temperature decreased from 70 degrees Celsius to 62 degrees Celsius. What is the Cp
Wednesday, October 23, 2013 at 9:43pm

Physical Science ASAP
1. true or false? a well-oiled machine has no friction. explain your answer. 2. True or false? Friction makes energy vanish. Explain your answer. 3. True of false? Electronic machines with no moving parts experience friction and get hot because electricity is moving through ...
Wednesday, October 23, 2013 at 9:36pm

science
An analysis for copper was performed on two pure solids. One solid was found to contain 43.0% copper; the other contained 32.0% copper. Could these solids be samples of the same copper-containing compound?
Wednesday, October 23, 2013 at 6:20pm

Science
How can weathering cause sedimentary rocks to form ?
Wednesday, October 23, 2013 at 3:55pm

science
How is ionising radiation affects the cell, DNA and can lead to tumours/leukaemia? nothing to complicated or technical like Wikipedia or anything that seems like that please. I just a few point for which I can then compile in a decent paragraph thanks in advanced!! :)
Wednesday, October 23, 2013 at 2:59pm

SCIENCE
How is ionising radiation affects the cell, DNA and can lead to tumours/leukaemia? nothing to complicated or technical like Wikipedia or anything that seems like that please. I just a few point for which I can then compile in a decent paragraph thanks in advanced!! :)
Wednesday, October 23, 2013 at 2:36pm

science
How is ionising radiation affects the cell, DNA and can lead to tumours/leukaemia? nothing to complicated or technical like Wikipedia or anything that seems like that please. I just a few point for which I can then compile in a decent paragraph thanks in advanced!! :)
Wednesday, October 23, 2013 at 2:28pm

SCIENCE
How is ionising radiation affects the cell, DNA and can lead to tumours/leukaemia? nothing to complicated or technical like Wikipedia or anything that seems like that please. I just a few point for which I can then compile in a decent paragraph thanks in advanced!! :)
Wednesday, October 23, 2013 at 1:53pm

Physical science
A ramp is 2.8 meters long and 1.2 meters high. How much power is needed to push a box up the ramp in 4.6 seconds with a force of 96 N?
Wednesday, October 23, 2013 at 12:52pm

science
How would you write a method on a hypotheses relating to meaning in life and both physical and psychological well-being scores.
Wednesday, October 23, 2013 at 10:49am

science
Consider a double star system under the influence of the gravitational force between the stars. Star 1 has mass m1 = 1.72 × 1031 kg and Star 2 has mass m2 = 1.60 × 1031 kg. Assume that each star undergoes uniform circular motion about the center of mass of the ...
Wednesday, October 23, 2013 at 10:44am

science
What keeps the very dense gas at the core of the Sun from becoming a solid?
Wednesday, October 23, 2013 at 10:23am

science
a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs
Wednesday, October 23, 2013 at 7:24am

Science
Explain how our everyday uses of natural resources around us become biomass. Give examples from your everyday life of resources that can later become biomass.
Tuesday, October 22, 2013 at 10:57pm

science
the differences between amino acids are in the? A: side groups B: hydrogen atoms
Tuesday, October 22, 2013 at 7:41pm

science
Which of the following is NOT a function of proteins? a: act as a main fuel for cells B: control chemical reactions in a cell
Tuesday, October 22, 2013 at 7:41pm

science
the differences between amino acids are in the? A: side groups B: hydrogen atoms
Tuesday, October 22, 2013 at 7:33pm

science
Which of the following is NOT a function of proteins? a: act as a main fuel for cells B: control chemical reactions in a cell
Tuesday, October 22, 2013 at 7:33pm

science
the differences between amino acids are in the? A: side groups B: hydrogen atoms
Tuesday, October 22, 2013 at 7:29pm

science
Which of the following is NOT a function of proteins? a: act as a main fuel for cells B: control chemical reactions in a cell
Tuesday, October 22, 2013 at 7:23pm

Science
How does seafloor spreading cause tectonic plates to move ?
Tuesday, October 22, 2013 at 6:38pm

math
the biology class has a lab every days. the earth science class has a lab every three days . which class day do they both have class ?
Tuesday, October 22, 2013 at 6:26pm

science
how dose the sea floor spreading cause tectoni plates to move
Tuesday, October 22, 2013 at 5:40pm

science
A substance that has a mass of 20g and volume of 10cm3. How much mass does one cm3 of this substance have? A substance with a mass of 125g and a volume of 25cm3. How much mass does one cm3 of this substance have? Please tell me how to do this.
Tuesday, October 22, 2013 at 5:05pm

science
You have a pulley 13.9 cm in diameter and with a mass of 1.7 kg. You get to wondering whether the pulley is uniform. That is, is the mass evenly distributed, or is it concentrated toward the center or the rim? To find out, you hang the pulley on a hook, wrap a string around it...
Tuesday, October 22, 2013 at 3:05pm

Science
In an experiment to find out how the proportion of cement in a concrete mixture affects the products strenghth what would be two controlled variables and what could a possible source of error in this experiment be ? Thank you for your help!
Tuesday, October 22, 2013 at 12:40pm

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil? I need some ideas for answering this question.
Tuesday, October 22, 2013 at 11:50am

science
Find and save a piece of junk mail. What is this piece of mail trying to persuade you to do? Were you at all tempted by the offer? Why or why not? What principles of social psychology does it use to accomplish its goals? How could you use your social psychology knowledge to ...
Tuesday, October 22, 2013 at 11:10am

science
Consider a double star system under the influence of the gravitational force between the stars. Star 1 has mass m1 = 1.72 × 1031 kg and Star 2 has mass m2 = 1.60 × 1031 kg. Assume that each star undergoes uniform circular motion about the center of mass of the ...
Tuesday, October 22, 2013 at 11:03am

science
A bungee jumper jumps (with no initial speed) from a tall bridge attached to a light elastic cord (bungee cord) of unstretched length L. The cord first straightens and then extends as the jumper falls. This prevents her from hitting the water! Suppose that the bungee cord ...
Tuesday, October 22, 2013 at 10:48am

Science
In a particular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that is heterozygous for coat color, what percentage of their offspring would you expect to be black? 25 50 75 100
Tuesday, October 22, 2013 at 3:48am

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil? I need some ideas for answering this question.
Tuesday, October 22, 2013 at 12:41am

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil? I need some ideas for answering this question.
Monday, October 21, 2013 at 9:02pm

science
Since 1932 Louisiana has been losing approximately twenty four square miles of it's coastal wetlands per year. which process is least responsible for this loss of land? a) saltwater intrusion b) the building of levees c) the building of canals d) falling sea levels
Monday, October 21, 2013 at 8:49pm

science
Some plants grow best rich, well drained soil ? which kind of soil would be best for these plants ? a) clay b) sand c) clayey loam d) sandy loam
Monday, October 21, 2013 at 8:40pm

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil? I need some ideas for answering this question.
Monday, October 21, 2013 at 5:46pm

Science
If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis? I have a graph with the vertical axis showing the percentage of radioactive element remaining. The values on the vertical axis are 0 (...
Monday, October 21, 2013 at 3:58pm

Science, Chemistry
A cylinder containing 11.0L of helium gas at a pressure of 165atm is to be used to fill birthday balloons to a volume of 2.50L per balloon and at a pressure of 1.10atm. What is the maximum number of balloons that can be inflated at a constant temperature? (remember that 11.0L ...
Monday, October 21, 2013 at 2:48pm

Science. Check answers
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity ← rolling friction sliding friction air resistance 3. A small fish in the ...
Monday, October 21, 2013 at 12:04pm

Science help! URGENT. Check answers
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity ← rolling friction sliding friction air resistance 3. A small fish in the ...
Monday, October 21, 2013 at 11:50am

Natural science
I want a balanced chemical equation for iron+oxygen=iron oxide please
Monday, October 21, 2013 at 11:01am

science
Based on the treatment scheme, what type(s) of raw water is / are being treated? Groundwater River water Riverbank filtrate Lake water Infiltrated river water
Monday, October 21, 2013 at 10:23am

science
1 what would cause a plant to have a shorter day. 2 what would cause a plant to have a longer day
Sunday, October 20, 2013 at 8:17pm

science
Explain what causes the tides to change
Sunday, October 20, 2013 at 8:15pm

science
Describe the motions that causes one day on earth
Sunday, October 20, 2013 at 8:14pm

Science
A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it neared the pile, the magnet started attracting small pieces of iron from the pile. What best describes? A. Solution or iron and sulfer can be seperated...
Sunday, October 20, 2013 at 6:50pm

Science
Water freezes at 0 Celisus. If a temperature drop is causing a glass of water to freeze, how would a thermometer in the water most likely change as the water freezes? A. The temperature would keep rising steadily. B. The temperature would keep falling steadily. C. The ...
Sunday, October 20, 2013 at 5:46pm

Science
Trini adds 10g of baking soda to 100g of vinegar. The mixture begins to bubble. When the bubbling stops, trini finds the mass of the resulting mixture. She determines its mass is 105g. Why has the mass changed? A. A gas has formed and left the mixture B. Vinegar evaporated ...
Sunday, October 20, 2013 at 4:46pm

Science
Which of the following is an example of how economics can affect science? A. Limited funding may lead scientists to research one topic instead of another. B. Legislators may create new laws about the use of natural resources based on the recommendations of scientists. C. A ...
Sunday, October 20, 2013 at 3:19pm

Science
Scientific investigations involve many steps and processes. Which characteristics define a laboratory experiment? A. hypothesis, models, and calculations B. test variables, data, and uncontrolled conditions C. data, conclusions, and unregulated environment D. independent and ...
Sunday, October 20, 2013 at 3:08pm

Science
Astrologers relate the location of stars and planets to events in human lives. Many years ago, people classified astrology as a science. Why do modern scientists consider astrology to be a pseudoscience A. Astrology does not involve the use of telescopes. B. Astrology does not...
Sunday, October 20, 2013 at 2:16pm

science.please help!
Would you expect to find the humid transitional zones on the coast or inland? Northern or Southern part of California?
Sunday, October 20, 2013 at 2:14pm

science@@@@
how to make a model for scince fair for purification of smoke coming out of chimneys? And how this purified smoke can be used for useful purposes? Does smoke contain moisture?
Sunday, October 20, 2013 at 12:33pm

science
Now assume that we are working in units such that ℏ=1. If the state of the system at time t=0 is ψ(0)=|0⟩, what is the state of the system at time t=π2? What about at t=π? t=π2:
Sunday, October 20, 2013 at 11:06am

science
Why is a coyote a poor indicator species What natural zone are each of these cities or areas in? Los Angeles, Palm Springs, Santa Monica Mountains, Catalina, San Francisco, Yosemite.
Sunday, October 20, 2013 at 3:25am

Environmental Science
Would you expect to find the humid transitional zones on the coast or inland? Northern or Southern part of California?
Sunday, October 20, 2013 at 2:40am

Science/Physics
The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 73 km/h.
Sunday, October 20, 2013 at 1:54am

english
(1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade science, I have some experience with the faces and ...
Friday, October 18, 2013 at 6:10pm

science
what is the probability of 2 tall pea plants hetrozygous for the tall allele producing a short pea plant
Friday, October 18, 2013 at 5:18pm

Science
Does the order of Nitrogen bases in DNA makeup the
Friday, October 18, 2013 at 4:02pm

science
Explain the following statement: "scientific knowledge is the result of a great deal of debate and confirmation within the science community."
Friday, October 18, 2013 at 8:15am

Science
What are the three ways to investigate science? Give an example of each.
Friday, October 18, 2013 at 8:03am

science
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
Friday, October 18, 2013 at 5:12am

science help!!!
1. Seahorses change color and swim together in predetermined ways before mating. These behaviors are called (1 point) asexual reproduction. sexual reproduction. courtship rituals. budding. 2. A male peacock displays his colorful tail feathers in order to (1 point) increase the...
Friday, October 18, 2013 at 2:08am

Science
Is a cell wall on a plant or animal cell or on both?
Thursday, October 17, 2013 at 10:55pm

Science
Which procedure is the best way to find the correct mass of an object in a laboratory experiment? 1)make sure the balance works correctly before starting the measurement. Record the mass for three trials. Then average the masses. 2)Readjust the balance after getting the mass ...
Thursday, October 17, 2013 at 7:06pm

Science
How did planetesmals form planets?
Thursday, October 17, 2013 at 7:01pm

Science
What condition is needed for an experiment to have useful data?
Thursday, October 17, 2013 at 5:41pm

Science
What condition is needed for an experiment to have useful data?
Thursday, October 17, 2013 at 5:36pm

Science
What is the difference between the layers of the earth by physical properties and chemical composition
Thursday, October 17, 2013 at 5:22pm

Health
1). Explain the relationship between the key terms in each of the following. a. direct pressure and indirect pressure b. goal and action plan A: a. Direction pressure is the pressure that results from someone who tries to convince you to do something you normally wouldn't ...
Thursday, October 17, 2013 at 5:04pm

Science
What condition is needed for an experiment to have useful data
Thursday, October 17, 2013 at 5:02pm

Science
If 1 rabbit has brown fur and another has black fur, what conclusion can you draw about the rabbits genetic code?
Thursday, October 17, 2013 at 4:59pm

Josh: Re: Science
Please do not post that set of questions again without posting your answers. If you do, you will be banned from posting on Jiskha for a while.
Thursday, October 17, 2013 at 4:54pm

Science
What condition is needed for an experiment to have useful data?
Thursday, October 17, 2013 at 4:51pm

science plz help right now!!!!
Multiple Choice 1. Over time, a particular plant has developed a longer stamen. Which of the following is a possible advantage of having a longer stamen? (1 point) A longer stamen could ensure that an insect brushes against an anther and picks up pollen. A longer stamen could ...
Thursday, October 17, 2013 at 4:43pm

science help plzzz
1. Over time, a particular plant has developed a longer stamen. Which of the following is a possible advantage of having a longer stamen? (1 point) A longer stamen could ensure that an insect brushes against an anther and picks up pollen. A longer stamen could ensure that the ...
Thursday, October 17, 2013 at 4:35pm

science
if 8.100 grams of C6H6 is burned and heat is produced from the burning is added to 5691 grams of water at 21 degrees celsius what is the final temp of the water? 2C6H6+15O2=12CO2+6H2O+6524kj
Thursday, October 17, 2013 at 3:48pm

Science
how do mrna and trna work together to make protein
Thursday, October 17, 2013 at 3:05pm

Science
How does dna determine a trait such as eye color
Thursday, October 17, 2013 at 8:40am

Computer Science
Give a modular exponentiation algorithm that examines the bits of b from right to left instead of left to right.
Thursday, October 17, 2013 at 6:16am

Science
How does dna determine a trait such as eye color
Wednesday, October 16, 2013 at 11:52pm

Physical Science
5. What reactions occurs when a solution of hydrochloric acid, HCl, is mixed with a solution of calcium hydroxide, Ca(OH)2? (A) Cl + Ca(OH) --> HCa + Cl(OH)2 (B) HCl + Ca(OH)2 --> H(OH)2 + CaCl (C) 2HCl + Ca(OH)2 --> 2H2O + CaCl2 (D) 2HCl + Ca(OH)2 --> H2Ca + 2ClOH...
Wednesday, October 16, 2013 at 8:49pm

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