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by Sumit

Question by msmithcc: can someone answer these questions for me please?
1. The O2 (diatomic oxygen) in the atmosphere
a. was present since the earth was formed.
b. was emitted by volcanoes.
c. is the result of sunlight decomposing water vapor.
d. was produced by photosynthesis.

2.A planet that consists largely of compressed gases is
a. Mercury.
b. Venus.
c. Mars.
d. Jupiter.

3. Planets travel in
a. Nearly circular ellipses
b. Oblong ellipses
c. Circles
d. It depends on the planet

4. The spectrum of a star can provide information of which one or more of the following?
a. the star’s magnetic field
b. the star’s temperature
c. the star’s relative motion toward or away from us
d. the star’s composition

5. Nuclear reactions in the sun’s interior convert
a. hydrogen into helium.
b. helium into hydrogen.
c. carbon into nitrogen.
d. uranium into plutonium.

6. At the end of its lifespan, a very heavy star
a. breaks up into several smaller stars.
b. cools down into a white dwarf.
c. expands into a red giant.
d. explodes into a supernova.

Best answer:

Answer by SueBeeRoo
I’m not gonna help you cheat on your take home test.

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NUCLEAR ENERGY, POWER PLANTS answer, Please, questions, someone, these

Question by SALTE: where can i buy an ion engine please help!!!!!?
i need to get my hands on an ion engine by this monday ! i have to also have it powered by batteries fuel and electricity does any one know where i can find a expert

Best answer:

Answer by Ed Atun
Your insurance agent will have one that his company has totaled…. with the damage to the rear of the vehicle.

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ION ENGINES engine, help, Please

Question by Emma: please read!!!!!!!!!!!!!!!!!! why?
sorry for the wrong catorgory, but this one gets more answers.
Could i have borderline personality disorder or bipolar disorder? or just nothing?
well i was depressed for like 6 months. i’m not super happy now, but i can go for more than 3 minutes without fantazing about suicide so i’ll take that as improvement. actually right now i’m kind of apathetic. i can sort of hide my emotions during the day when i’m around people, but like at night i can’t really. i can just cry for an hour and feel hopeless. i did the wait thing. but i don’t really get the point. because my happiest i’m still sad. and i realized that life is pointless, and it only has meaning if u make it, and i can’t make it. i found one thing to hold onto, music. and for the BPD thing i have anger outbursts that are reallly extreme. and i have the hate love thing. but i also have people i just don’t care about period. so i don’t hate them. i also had the self hurt problem. but it’s not a big deal because it’s not enough to die. and i never touch my right wrist so even if it did go too deep i wouldn’t die. yea i have a note but it’s really $hitty. but yea i don’t want to do anything now, but it’s not like i want to be alive. so why should i try not to when i want to die? and for the BP thing, i don’t think i have it. but sometimes i just feel like on top of the world and everything is amazingly funny, but it never lasts for long. and then i just feel a lot worse afterwords. so do i maybe have one? are they even real? or just things doctors say cuz they want to make more money by giving u useless therapy and drugs. so yea or is it just normal cuz im a teenager and thats what ppl say and like its a lil common for teenagers to kill themselves. but i always act so happy around ppl its weird. im also really paranoid. i dont know if that has to do with anything. sorry for so much writing
no i dont believe in god. hes not real, and neither is heaven or hell. so those of u who waste ur life’s praying or at church will find out when u die. actually u won’t find out because after death there is nothing

Best answer:

Answer by Akon Lova
You need a companion of some sort.
I would suggest a dog or another human whom you can relate to or share your feelings with.

Music is always good, I love listening to it when I am exercising, so you should keep doing that. Maybe try a new genre like R&B because depressing music could have possibly made your condition worsen.

I don’t understand why you would want to kill yourself though, you haven’t even met the love of your life yet. And even if you did kill yourself where would you go after that? Do you think you would go to heaven or would it just end? Either way why not experience life on this earth for as long as you can because there are so many pleasures that you have yet to enjoy

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OIL DISASTERS Please, read

by tom.arthur

Question by ARNEL S: please help me to find out the website of using solar panel to produce electricty and how much the price of?
solar panel grid used in a roof top of a house….what exactly or total price of solar panel…thank you! help me to find the website….

Best answer:

Answer by Poor one
Ebay is a great source of thing kind of thing

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SOLAR POWER Electricty, find, help, much, panel, Please, price, produce, solar, using, website

by BP America

Question by tweety97_99: edema help please?
i am a 34 yr old single mom and for fours now sufffering edema bad this last year has been the worst i have been on 3 or 4 different diuretics one will work for a week then stop,i have had potassium drops from these meds…kidney function and cardio gram of heart done both came back fine i am at a loss what to do as i sit here typing my legs are so huge dont even know where my knees or ankles are..shoes are a joke nothing fits my legs are just so sore and the last two weeks by the time i get to bed swollen to knees and then my knees are killing …i also have High BP and Hgh Cholesterol

.on top of that i work 6 hrs a day at a desk,i cut out most junk food,its hard to get good excersize as i have a disabling back conditon so cant stand or walk long periods due to that,and yes i am overweight….want my life back any advice would be great :)

Best answer:

Answer by Roz
First cut out ALL SALT. A good substitute for salt is dill weed Not the seeds. Just a little sprinkle will do.
Keep your legs elevated as often and as long as possible. Ice pack them while they are elevated. (A bag of frozen peas makes a good I pack.) When you go to bed, put pillows under your feet and calves to elevate them through the nite. Your Dr. should be giving you potassium tablets for the K drop. Knock off the fatty food, I use weight watchers cook book. great stuff and simple to use. Have you been checked for Hyperglycemia? If you are dangerously obese, most insurance will pay for gastric bye pass surgery. You do have to consult with several doctors to have this including a Psychiatrist. That is just to get you to the mind set for the surgery not because of a mental problem. Check with your doctor and ask him about the bye pass, usually they won’t suggest it unless you ask.
Hope this helps.
Good luck

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OIL DISASTERS edema, help, Please

Question by Help :): I have to draw a nuclear fission reactor that uses uranium for fuel for science? Please Help.?
I’m so lost. Please help me.

Best answer:

Answer by curious george
check out this link

http://www.nrc.gov/reading-rm/basic-ref/students.html

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NUCLEAR ENERGY, POWER PLANTS Draw, fission, fuel, help, nuclear, Please, reactor, Science, uranium, uses

Question by illdieskating83: Solar Sail problem physics please help?
given info:
A solar sail allows a spacecraft to use radiation pressure for propulsion, similar to the way wind propels a sailboat. The sails of such spacecraft are made out of enormous reflecting panels. The area of the panels is maximized to catch the largest number of incident photons, thus maximizing the momentum transfer from the incident radiation.
For such spacecraft to work, the force from the radiation pressure exerted by the photons must be greater than the gravitational attraction to the star emitting the photons. The critical parameter is the area density (mass per unit area) of the sail.

Part A asks for the magnitude of the force due to the radiation pressure of the sunlight on the mirror. The answer for this part is (2(Intensity)(area))/speed of light (c).

Part B: Suppose that the mirror described in Part A is initially at rest a distance R away from the sun. What is the critical value of area density for the mirror at which the radiation pressure exactly cancels out the gravitational attraction from the sun?

Express your answer numerically, to two significant figures, in units of kilograms per meter squared.

To solve the second part of this problem you will need to know the following:

-the mass of the sun, M= 2*10^3 kg,
-the intensity of sunlight as a function of the distance R from the sun,
I(R)=3.2*10^25 (1/R^2) (W/m^2),
-the gravitational constant G=6.67*10^-11 (m^3/(kg*s^2) .

I cannot figure out how to find this last part as to where the pressure and area density are coming from what would this answer be? please help
I know that the area density is M/A so i need to figure out the Area that would cancel out the gravitational force and dont know how to do this. Im guessing that F=(2 (I(R))(A))/c which would give unknowns of distance R and the area A.

Best answer:

Answer by billrussell42
I disagree with your premise: “For such spacecraft to work, the force from the radiation pressure exerted by the photons must be greater than the gravitational attraction to the star emitting the photons.”

The spacecraft would start out in orbit around the sun, so the gravitational attraction of the sun is not relevant. It would spiral out to the destination, presumably another planet.

If the spacecraft had to directly oppose the gravity of the sun, it would need more force than a Saturn V rocket, not even remotely possible for a solar sail.

.

Give your answer to this question below!

ION ENGINES help, physics., Please, problem, Sail, solar

1) a nuclear power plant generates_________energythat boils water to produce steam.

2) the spinninggenerator of a nuclear power plant converts ________ energy into electrical energy.

3) Why is nuclear energy considered a nonrenewable resorse?

4) How does a hydroelectric dam change kinetic energy into electrical energy?

5) Wind turbines convert energy of air in to ___________ by turning a generator.

6) the thermal energy caused by the heating of earth’s crust is called__________.

7) some geothermal power plants pump water underground next to hot__________.

8) organic matter that can be burned to realease energy is called_________.

9) Name one disadvantage of fossil fuels.

10) Why can’t solar energy br used to meet the energy needs of large cities?

11) Why is hydroelectric energy not always a disirable energy resource?

thank you in advance. appropriate answers only. thanks again.

STEAM POWERED Anyone, help, Please, problems, Science, these

So i was wondering how are biofuels converted into electricity.
Do they just use it in place of fossil fuels and do the same thing? Just use the biofuels to burn up to turn a turbine which generate electricity and wallah electricity for everyone.

BIOFUEL BIOFUEL, converted, electrical, energy, into, Please, read

Which of the following statements describes the interaction between magnetic poles?
(1 point)
Like poles attract each other.
Like poles repel each other, and opposite poles attract each other.
Opposite poles repel each other.
Like poles attract each other, and opposite poles repel each other.
2. Which of the following statements is true about Earth’s magnetic poles?
(1 point)
They are located at Earth’s geographic poles.
They are the areas where Earth’s magnetic field is weakest.
They are the areas where Earth’s magnetic field is strongest.
Earth has four magnetic poles.
3. Which of the following statements is true about ferromagnetic materials?
(1 point)
All ferromagnetic materials are permanent magnets.
Ferromagnetic materials that are permanent magnets have domains that are randomly oriented.
Ferromagnetic materials that are permanent magnets have domains that remain aligned for long periods of time.
Ferromagnetic materials do not have domains and cannot be magnetized.
4. If the current in a wire is directed upward, what is the direction of the magnetic field produced by the current?
(1 point)
counterclockwise in the horizontal plane
clockwise in the horizontal plane
in the same direction as the current
in the opposite direction to the current
5. Which of the following statements is true about a current-carrying wire in a magnetic field?
(1 point)
Reversing the current direction will cause the force deflecting the wire to be parallel to the magnetic field.
Reversing the current direction will cause the force deflecting the wire to be perpendicular to the magnetic field but in the opposite direction.
Reversing the current direction will cause the force deflecting the wire to be parallel to the velocity of the charge.
Reversing the current direction will not affect the force deflecting the wire.
6. How can the voltage in a coil of wire be increased in the process of electromagnetic induction?
(1 point)
Move the magnet inside the coil of wire more slowly.
Hold the magnet stationary.
Move the coil of wire slowly, and keep the magnet stationary.
Move the magnet inside the coil of wire more rapidly.
7. A DC generator is similar to an AC generator except that in
(1 point)
DC generators, slip rings produce direct current.
DC generators, commutators produce direct current.
AC generators, commutators produce alternating current.
AC generators, no commutators or slip rings are used.
8. A transformer has a primary coil with 500 turns and a secondary coil with 250 turns. If the output voltage is 240 volts, what is the input voltage?
(1 point)
96 volts
120 volts
480 volts
500 volts
9. How are fossil fuels used to generate electrical energy?
(1 point)
Heat from burning fuel spins magnets inside an electric motor.
Heat from burning fuel creates steam that spins a turbine.
Heat from burning fuel causes an electric motor to produce a current.
Heat from burning fuel creates steam that turns a transformer.
Completion
Complete each sentence or statement.

10. In a solenoid, there will be no magnetic field if there is no ____________________ in the wires of the coil.
(1 point)

11. The statement that a voltage can be induced in a conductor by a changing magnetic field is known as ____________________ law.
(1 point)

12. Large power plants in the United States currently use _________________________ generators.
(1 point)

STEAM POWERED CAA., help, Magnetism, Physical, Please, Science, Unit

A constant electric current flows for 3.75 hours through two electrolytic cells connected in series.
One contains a solution of AgNO3 and the second a solution of CuCl2. During this time, 2.00 g of silver is deposited in the first cell.

(a) How many grams of copper are deposited in the second cell?
(b) What is the current flowing (in amperes)?

HYDROGEN chemistry, help, Please, Review, work

1. Generators convert physical energy into __________. (1 point)
sound waves
electrical energy < ---
batteries
motors

2. Thermal power plants heat ______ to create steam. (1 point)
wood
water <-----
plants
fossil fuels

3. Nuclear fission ________ atoms to create heat energy. (1 point)
heats
corrodes
splits
combines<-----

4. A machine that converts electrical energy to mechanical energy is called a/an ______________. (1 point)
generator <------
solar panel
windmill
motor

STEAM POWERED check, homework.., Please, Science

1. Generators convert physical energy into __________.
sound waves
electrical energy
batteries
motors
2. Thermal power plants heat ______ to create steam.
wood
water
plants
fossil fuels
3. Nuclear fission ________ atoms to create heat energy.
heats
corrodes
splits
combines
4. A machine that converts electrical energy to mechanical energy is called a/an ______________.
generator
solar panel
windmill
motor
5. Nuclear power plants use the radioactive element ________ to create energy.
californium
plutonium
kryptonite
uranium-235
6. Green power comes from ___________.
wind
sun
water
all of the above
7. Geothermal energy comes from _______ deep in the earth.
magma
lava
solar power
volcanoes
8. Landfills emit ________ gas.
petroleum
methane
oxygen
butane
9. ______ power can be harnessed in the ocean to create power.
Chemical
Wave
Nuclear
Solar
10. Which state would best be suited to harness wind energy?
California
Florida
North Dakota
South Dakota

STEAM POWERED environmental, help, Please, Science

I just need a rough explanation

BIOFUEL BIOFUEL, Debate, explain, food, fuel, Please, somebody

1. How is electricity for houses generated at the power plant?
My answer: At thermal power stations where heated water turns into steam which rotates a steam turbine, driving the electrical generator.

2. How is that electricity transferred? How can you estimate the voltage of a power line by looking at it?
My answer: Through power lines. (Not sure about 2nd part of question)

3. What is the name of an electrical device that changes the voltage from power company from high voltage to low voltage? Does that device work from both AC and DC?
My answer: Transformers. Yes it works for both AC and DC.

Im not sure if all my answers are right. thank you guys for checking and could you also provide me with the correct answer if i made a mistake?

STEAM POWERED answers, check, electricity, Please, questions

29. _____ is the waste that is created in the process of making products.

(1 point)
pre-consumer waste
post-consumer waste
e-waste

rucksack
30. Compost is a rich soil amendment of organic matter that is made from decomposed plant parts collected from kitchen or yard waste. (1 point)
True
False
31. It is estimated that there are thousands of satellites, pieces of old booster rockets, nuts and bolts, and a long list of scrap material left in orbit above the Earth. (1 point)
True
False
32. The Department of Transportation (DOT) is in charge of all forms of transport systems and vehicles. (1 point)
True
False
33. Modern thermal power plants generate power basically the same way that old steam engines do. (1 point)
True
False
34. The great Trans Alaska Pipeline System (TAPS) began oil transport in 1977 and has maintained the highest flow rates since it began. (1 point)
True
False
35. All of the following power plants are considered thermal power plants because they heat the steam that works the generators, except (1 point)
nuclear power plants
coal burning power plants
fossil fuel power plants
hydroelectric power plants

36. Most crude oil is delivered from terminals to refineries by: (1 point)
tanker jets

cargo trains

underground pipelines
off shore drills
37. “Green Power” clean energy production refers to all of the following new power sources except for : (1 point)
wind generators
geothermal energy
solar energy panels

nuclear fusion
38. All of the following are important integrated pest management (IPM) strategies, except:

(1 point)
using good bugs to kill bad bugs

trimming off infested plant branches

never sterilizing tools
using chemicals only when necessary
39. All of the following statements are true, except: (1 point)
The US is largest producer of corn in the world.
Corn is the main cattle and production animal feed in the US.
Almost all of the corn grown in the US is exported.
Corn alcohol is distilled to make the cleaner fuel called ethanol.

40. All of the following statements are true, except:

(1 point)
Tractors allowed farmers to be more productive and changed human lifestyles.
The US is considered a major agricultural nation.
Agriculture in the US has to follow the strict environmental laws of the US Farm Bill.
There are currently no inspection services for food grown in the US.
41. __________________ maintains balance in an ecosystem. (1 point)
Sustainable land use
Genetic engineering

Deforestation
Combustion
42. _____________ is a technology which bypasses all natural barriers that prevent different organisms from breeding. The technology removes DNA material from one organism and plants it in a different organism s DNA.

(1 point)
Biodiversity
Genetic engineering
Bioremediation
Hemodialysis
43. _____________ is a fuel source made from the byproducts of the agricultural industry such as leftover straw from fields of grain, vines from pumpkin farms, or wood chips from lumber processing. (1 point)
Fertilizer
Nuclear energy
Biomass fuels
Bio-plastic

STEAM POWERED answer, best, help, Please, points, Science

Im doing a school project where u must write a disscusion on a renewable energy sorce that would or would not be sutible for the redlands.

GEOTHERMAL ENERGY energy, geothermal, information, Please

I understand that energy is converted from one form to another and that the law of conservation of energy states that energy is not created or destroyed. However, I do not understand how energy is conserved if it seems to eventually dissipate. For example, when a top spins kinetic energy is not lost because it is transformed into thermal energy due to friction. When the top eventually stops and when the ground “cools” and everything seems to have reverted back to what it was before, how is energy still conserved?

CONSERVATION, THE 5TH FUEL Conservation, energy, explain, Please

1) How much pressure must be produced in a cylinder with a diameter of 10 CM that moves 5cm after an explosion in the cylinder doing 1000 joules of work. IF the temperature in the cylinder is 450 °C What is the maximum efficiency on a sunny day where the temperature is 35°C ?

2) what is Charles Law and how is it used to determine absolute zero? Determine absolute zero from the following data and calculate the percent error
T1= 100°C , V1=150cubic centimeter and T2 = 0 °C ,V2= 120cubic centimeter

3) A coal power plant operates a boiler making steam at 450 °C that runs a generator to do electrical work. The steam leaves the generator at 200 °C. In addition, the energy used to create the steam is 2 times 10^6 Joules however only 5.6 times 10^5 joules are produced by the generator. What is the ideal efficiency and the actual efficiency?

STEAM POWERED answer, Physic, Please, points, problems, Serious

Identify the parts of a voltaic and electrolytic cells and explain how each part operates?? Does anybody know please thoroughly explain this to me thank you.

HYDROGEN Cell, each, explain, operates, Part, parts, Please, someone, voltaic