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Question by oceandreamgoddess: Help! How do you get exsessive grease out of your hair?? I’ve tried everything?
-my niece had gotten head lice and I didn’t want to get it so i did a search on home remedies and it said to saturate your hair in essential oils that it would smother and kill lice and eggs -turns out I didn’t even have lice but now I am stuck with super greasy hair!!!! I used gobs and gobs of coconut oil hairdressing -I have tried to get it out with dish detergent and hand de-greaser but nothing works -I’ve washed my hair 15 times in the last 2 days and now its kinda filmy or waxy – Help me please – I had to miss work because my boss sent me home until I can fix this cause I work at a top-scale restaurant and appearance is crucial -I dont want to get fired for this – What can I use that will cut the grease out of my hair ASAP ??!!

Best answer:

Answer by ♥ Sweetpea ♥
Try baking soda

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OIL DISASTERS EVERYTHING, exsessive, grease, hair, help, I've, Tried

by PhOtOnQuAnTiQuE

Question by Cynthia Gomez: ENGINEERING HELP NEEDED?
solar sails—large sheets of material that would work by reflecting photons. Since the momentum of the photon would be reversed, an impulse would be exerted on it by the solar sail, and—by Newton’s Third Law—an impulse would also be exerted on the sail, providing a force. In space near the Earth, about 3.84 x10^21 photons are incident per square meter per second. On average, the momentum of each photon is 1.30 x 10^-27 kg m/s. For a 1325-kg spaceship starting from rest and attached to a square sail 24 m wide. What is the speed of ship in 1s.

The answer from back of book says 4.333 x 10^ -6 but I keep getting 4.92 x 10^ -6. ANYHELP !!!!

Best answer:

Answer by normally laconic
Photons striking sail in 1 second =3.84e21 m^2/s * (24 m)^2 * 1s = 2.212e24
Their collective change in momentum, assuming that they are reflected back along their incident path, is twice the velocity (since it reverses direction), or
M = 2.212e24*2*1.3e-27 = 5.75e-3
For the ship, the change in momentum is the same, so
v = M / m = 5.75e-3 / (1.325e3) = 4.34e-6 m/s
I agree with the book!

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ION ENGINES engineering, help, needed

Question by Andi C: Does magnetic engine exist? Can you help me to build one by myself?

Best answer:

Answer by urwumpe
They do exist, but I can’t help you. Do you have a vacuum chamber to test it?

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MAGNETIC ENGINE, MOTOR build, engine, exist, help, magnetic, myself

In this video Raymond Butler, Special Projects Manager at BP, describes a new heavy oil skimming procedure. Developed by Captain Gerrad Matherne, this new procedure enables Vessels of Opportunity (VoO) to filter water from the Gulf rather than skim oil from the surface.
Video Rating: 1 / 5

am 31.05.2010 wurden auf der Unterwasser-Kamera eines Tauchroboters Fische gesehen, die sogar durch die Ölwolke geschwommen sind. On 2010-05-31 there were some fishes directly at the oil-plum of the bp-oil-spill.
Video Rating: 5 / 5

OIL DISASTERS heavy, help, Skimming, Technologies

Question by Cynthia Gomez: PHYSICS HELP WANTED ASAP?
solar sails—large sheets of material that would work by reflecting photons. Since the momentum of the photon would be reversed, an impulse would be exerted on it by the solar sail, and—by Newton’s Third Law—an impulse would also be exerted on the sail, providing a force. In space near the Earth, about 3.84 x10^21 photons are incident per square meter per second. On average, the momentum of each photon is 1.30 x 10^-27 kg m/s. For a 1325-kg spaceship starting from rest and attached to a square sail 24 m wide. What is the speed of ship in 1s.

The answer from back of book says 4.333 x 10^ -6 but I keep getting 4.92 x 10^ -6. ANYHELP !!!!

Best answer:

Answer by billrussell42
24 m square is 576 m²
take 1 second.

576 m² x 3.84e21 photons /m² = 2212e21 photons

2212e21 photons x 1.3e-27 kg m/s / photon = 2875e-6 kg m/s = 2.875e-3 kg m/s momentum change
But that is if the photons are absorbed. If they are reflected, the change is twice that

2 x 2.875e-3 kg m/s / 1325-kg = 4.34e-6 m/s

.

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ION ENGINES ASAP, help, physics., wanted

by NASA’s Marshall Space Flight Center

Question by John: PHYSICS PROBLEM HELP?
solar sails—large sheets of material that would work by reflecting photons. Since the momentum of the photon would be reversed, an impulse would be exerted on it by the solar sail, and—by Newton’s Third Law—an impulse would also be exerted on the sail, providing a force. In space near the Earth, about 3.84 x10^21 photons are incident per square meter per second. On average, the momentum of each photon is 1.30 x 10^-27 kg m/s. For a 1325-kg spaceship starting from rest and attached to a square sail 24 m wide. What is the speed of ship in 1s.

The answer from back of book says 4.333 x 10^ -6 but I keep getting 4.92 x 10^ -6. ANYHELP !!!!

Best answer:

Answer by Old Science Guy
we may both be making the same mistake,
but I get your answer, too.

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ION ENGINES help, physics., problem

Question by Dallas Fan: PHYSICS PROBLEM HELP NEEDED ASAP?
I got this problem and I asked the teacher for help so we solved it together and now i have a question.

THis is the problem and my solution is under it .

Although they don’t have mass, photons—traveling at the speed of light—have momentum. Space travel experts have thought of capitalizing on this fact by constructing solar sails—large sheets of material that would work by reflecting photons. Since the momentum of the photon would be reversed, an impulse would be exerted on it by the solar sail, and—by Newton’s Third Law—an impulse would also be exerted on the sail, providing a force. In space near the Earth, about 3.84 1021 photons are incident per square meter per second. On average, the momentum of each photon is 1.30 10-27 kg m/s. For a 1275-kg spaceship starting from rest and attached to a square sail 24 m wide, how fast could the ship be moving after 1 hour?

(3.84×10^21)(24^2) = 2.21184 x 10 ^ 24 — > number of protons string the sail in 1 sec

P = mv
v = p/m
[( 2 ) ( 1.30x10^-27 ) ( 2.211x 10 ^ 24 ) ]/ 1275 = 4.5087 x 10^ -6

1 hour = ( 4.5087 x 10^-6 ) ( 3600 s ) = 0.01623 m/s

My question is what Why do you have to multiply the the momentum/ mass by 2 .

Best answer:

Answer by kuiperbelt2003
the factor of 2 arises because the force is a result of the change in momentum of the photons, remember that momentum is a vector, so if the direction away from the sun is positive, the direction back toward the sun is negative…and when you find momentum change you get:

change in momentum = final momentum – initial momentum = -p-p=-2p where p is the magnitude of the momentum

hope this makes sense

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ION ENGINES ASAP, help, needed, physics., problem

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

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 pamcarter: Oil spill, will positive thoughts help?
An expert has said that if the “top kill method” or “relief well method” don’t work that it could take 9000 days (25 years) for the oil to stop on it’s own due to the pressure it is under. Maybe it is time for some positive energy (or prayer, based on your beliefs) to be invested toward success of this “top kill” method. Faith can move mountains and maybe all that is left is positive energy toward a solution.

Best answer:

Answer by Allie
I’m not religious, but I sure hope it works. This is a disaster.

What do you think? Answer below!

OIL DISASTERS help, positive, spill, thoughts

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.

.

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

by Joost J. Bakker IJmuiden

Question by Word N: Can you help me identify weather the below equations are alpha decay, beta decay or fusion?
a. Thorium-234 Proactinium-234 + -1 degrees e…… is ?
b.Hydrogen+Hyrogen Helium……. is what?
c. Uranium-238 Thorium-234+ Helium-4……….is?

Thanx a mill!

Best answer:

Answer by YATAAA !
right – im not gonna bother giving you the answer BUT
no infact wait- B. is fusion. how i know? because you look at the mass number- of the 2 hydrogens and they add together to give the mass number of helium

fusion reactions are easy- its two light nuclei- the hydrogen which fuse together to give a heavy nuclei thats hydrogen- that is a classic example.

right during beta decay- the product always has an atomic number that is ONE more than the atomic number of the reactant.

during alpha decay- the mass number increases by 4 and the atomic number by 2- and a helium (which is an alpha particle) always gets ejected from the nucleus

so C. is alpha decay- due to the helium and A is beta decay

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NUCLEAR ENERGY, POWER PLANTS Alpha, below, beta, decay, equations, fusion, help, identify, weather

A few nice top kill oil images I found:

THE OIL SPILL COULD HAVE BEEN SOLVED ON DAY 2……..IF WE HAD ASKED FOR HELP FROM NATIONS WHO HAD HIGH-TECH IN UNDERWATER OPERATIONS……….FOR EXAMPLE, CHINA, who built the THREE GORGE DAM….could have solved this problem. I know this for a fact.

Image by roberthuffstutter

IMG_3757

Image by New Orleans Lady

OIL DISASTERS 2........IF, asked, been, built, China, could, DAM....could, example, fact, from, GORGE, help, HIGHTECH, know, nation's, OPERATIONS..........FOR, problem, solved, spill, this, three, underwater

I need assistance in figuring out this problem: A 0.40 kg ball is thrown with a speed of 12 m/s at an angle of 33 degrees. a)What is its speed at its highest point? and b) how high does it go? (Use conservation of energy, and ignore air resistance.)

(For part a) I’m guessing that the conservation of energy equation doesn’t apply because there is no vertical velocity and only horizontal velocity, which would be 12 * cos 33 degrees)

Thanks!

CONSERVATION, THE 5TH FUEL Ball, Conservation, energy, help, physics., thrown

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

If 4.8 x 10 ^ 5 g of Cl2 are obtained, what is the current in amperes?

I am trying to study for my final, and there are review final questions with no answers. I try to do some , but am not sure if thats the way to do it or if it is the right answer.

Thank You , I really appreciate your time.

HYDROGEN Cell, constant, containing, current, Electrolytic, help, Hours, MgCl2, molten, passed, Through

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