What causes the direction of currents in the mantle in the Earth?
Q. Does the direction of the Earth's rotation affect the direction of currents in the mantle? I know that the currents are caused by the mantle heating and cooling, and thus rising and falling, and I know that the currents in the mantle cause the tectonic plates to move. But I really want to know what affects the direction of those currents.
Asked by Adam Wall - Wed Sep 16 16:20:58 2009 - - 1 Answers - 0 Comments

A. There's an awful lot we just don't know about tectonics. You've hit on one of them. I've spent time staring at maps of the Earth's plates trying to visualize any pattern of motion underneath and to me it seems completely random. It's certainly possible the Earth's rotation influences the mantle's convection. There's probably a complex group of causes each affecting every other, like local rock composition, local variations in heat rising from below, lateral currents from some other sources, interference from subducted crust and who knows what else. There's a LOT of research going on to understand this. If this interests you enough, might you have found your life's calling? Good minds are certainly needed.
Answered by NoPlate - Wed Sep 16 20:42:02 2009

What direction does the sunset appear to move on the horizon over the year?
Q. I'm doing some observations of sunsets and was just wondering, along the span of the year, what direction does the sun appear to move along the western horizon for sunsets? I know it does not actually move, but what is its apparent movement direction? Thank you!
Asked by Megan P - Wed Apr 29 14:35:13 2009 - - 2 Answers - 0 Comments

A. Yes, for the Northern Hemisphere, it appears to head northward in the summer, and southward in the winter. In the Southern Hemisphere, you will get the opposite effect
Answered by Geology Rock Star - Wed Apr 29 14:39:10 2009

What direction do car engines turn in if your looking at the front? Is this a standard for all engines?
Q. I have a broken volkswagen 1.9 L turbo engine. I need to know what direction (if your looking at the front) the output shaft turns in.
Asked by dimitriifromcali - Sat Oct 6 19:55:26 2007 - - 4 Answers - 0 Comments

A. Clockwise if you facing the car front.
Answered by James1982 - Sat Oct 6 20:15:52 2007

What direction is the electric field if the test charge is negative?
Q. In the problem I'm considering, the test charge q is negative and the force on q is pointing upward. Does that mean that electric field is opposite in direction the force in this case and thus it points downward?
Asked by Muffins - Tue Feb 2 22:34:28 2010 - - 1 Answers - 0 Comments

A. direction of the field is the direction of the force
Answered by hellp D: - Tue Feb 2 22:38:40 2010

What direction would you point a telescope to see the big bang?
Q. If you could build a telescope that can see light from 13-14 billion light years away, then you could see light from the early universe, no? Is it correct that you could point that telescope in any direction and pick up radiation from the early expansion of the universe?
Asked by Christopher L - Mon May 14 10:01:15 2007 - - 10 Answers - 0 Comments

A. It doesn't matter what direction you point the telescope in: the fossil radiation from the Big Bang comes from every direction. So the answer to the second part of your question is "yes". We can build such telescopes and have done so, e.g. the COBE and WMAP satellites. The important thing to realize is that because of the expansion of the Universe the radiation has been redshifted into the microwave region of the spectrum; it is no longer detectable as visible light.
Answered by Astronomer1980 - Mon May 14 10:06:26 2007

Do solar radiometers rotate the same direction in the northern hemisphere the same as the southern hemisphere?
Q. Solar radio meters are the spinning fan inside what looks to be light bulb. These objects are used in physics experiments. Hemisphere is in reference to the person's location on earth who would be checking the direction of rotation for the radiometer. Water direction is opposite as it goes down the drain. Is the radiometer's direction different or the same?
Asked by dellostritto@sbcglobal.net - Wed Sep 19 19:08:49 2007 - - 1 Answers - 0 Comments

A. - A solar radiometer will not be affected by the hemispherical location. It operates on absorption of light and conservation of momentum. - If it makes you feel any better, the "water-direction reversal" is also a myth!
Answered by nealjking - Wed Sep 19 20:14:39 2007

How can I shave in the direction of hair growth?
Q. I have heard that it is better to shave in the direction of hair growth. I have always shaved in the opposite direction, and now when I try to change, it accomplishes absolutely nothing. I can't shave in the direction of hair growth and get any off. Any tips, suggestions, advice?
Asked by MinaMay - Thu Aug 16 16:52:17 2007 - - 3 Answers - 0 Comments

A. don't shave WAX its so much nicer to just have to wax once a month and that's it but if u do i've heard ky jelly works better than shaving cream ??? don't know if it does but n e who
Answered by sweet - Thu Aug 16 17:08:47 2007

What direction should I go to become a Radiation Therapist?
Q. My goal is to become a Radiation Therapist. I am trying to figure out if I should get my bachelors degree in Radiology Tech first, then continue on to Radiation Therapist? Or should I not get my bachelors in Rad Tech, and just do radiation therapist? Is that even an option?Not sure on which direction to go. Would it be more beneficial to do both?
Asked by Michael - Sat Feb 27 03:02:43 2010 - - 2 Answers - 0 Comments

A. If you're not really interested in doing x-ray, I suggest you go straight into radiation therapy. If I could do it over again, that's what I would do. Radiologic technology bachelor degrees are pretty rare and unnecessary anyway.
Answered by RadTech - BAS RT(R)(ARRT) - Sat Feb 27 17:25:22 2010

How the direction of take-off and landing of commercial aircrafts in an airport is decided?
Q. I live near an airport with one north-south runway. I find that sometimes all flights are landing from north and flying towards the north, and sometimes all of those (same flights) are landing from the south and taking off towards the same direction. What are the reasons? It appears that this is not at all related to the origin or destination of the flights. I have seen it to happen for the same flight I use to travel regularly. Sometimes it landed from the north and sometimes from the south.
Asked by sbs_cu - Mon Dec 17 23:23:38 2007 - - 3 Answers - 0 Comments

A. It is due to wind direction. Planes fly towards the wind on takeoff and landing, as the aerofoil (wings) operate with air blowing over them (from the front). It is safer to takeoff and land towards the wind because it optimises the efficiency of the wings and tailplane surfaces and controls (ailerons, rudder, flaps). However, there may also be other rules regarding your airport's operation that are safety related.
Answered by free_kiwi - Mon Dec 17 23:41:30 2007

What is the acceleration in the y direction of the astronaut formula; how is it derived?
Q. Suppose we have a rocket that has an acceleration of 9.26 m/s2 in the x direction. What would the acceleration in the y direction of an astronaunt be inside the rocket. Assume that the astronaunt is on Earth and that there is only an x (horizontal) and y (vertical) direction.
Asked by Damien - Thu Jul 1 12:01:10 2010 - - 2 Answers - 0 Comments

What are the magnitude and direction of the friction force?
Q. The force applied to the card by srping scale FA is 10.5 N. The cart no moves toward the right with a constant velocity. What are the direction and magnitude of the frictional force? I understand the direction will be to the left. But I am not sure how to find the magnitude with calculations.
Asked by boytoy123 - Sun Jun 21 05:29:49 2009 - - 1 Answers - 0 Comments

A. Because the cart is moving with constant velocity in straight line, its acceleration has to be zero and so the net force acting must be zero. So frictional force must be equal to 10.5 N in opposite direction. THe net force, F = Fa + f, where 'Fa' is applied force and f is frictional force . Because the acceleration, a of car = 0, F = ma = 0 or F = Fa + f= 0 or f = - F.
Answered by Let'slearntothink - Sun Jun 21 05:38:38 2009

How do you determine magnitude and direction of a force that completely cancels a resultant force vector?
Q. In the previous question, I determined the resultant force vector has a magnitude of 55.9 N and the direction is 75.4 degrees. Now, I need to find the force of the vector that would completely cancel out that vector. Would it have the same magnitude but just a different direction?
Asked by girlmeetsworld0407 - Sun Sep 14 18:22:17 2008 - - 1 Answers - 0 Comments

A. same magnitude; opposite direction
Answered by steven_truemper - Sun Sep 14 18:25:41 2008

What is the direction weather usually travels in the United States?
Q. Hi what is direction weather usually travels in the United States? AND why does it travel that way. thanks!
Asked by 1stepatatime - Wed Nov 5 01:27:39 2008 - - 2 Answers - 0 Comments

A. west to east because we are above the equator.
Answered by freewebsjunk - Thu Nov 6 12:05:28 2008

What is the direction of motion of the particles after the collision?
Q. Two particles of masses m_1= 2 kg and m_2= 5 kg move towards each other. Mass m_1 has a velocity of 10 m/s at an angle of 53 degrees south of west and mass m_2 has a velocity of 12 m/s at an angle of 25 degrees north of east. After the collision they stick together. What is the direction of motion of the particles after the collision?
Asked by llmastermind - Fri Apr 11 13:38:59 2008 - - 1 Answers - 0 Comments

A. resolve the velocities into their respective components. For exapmle 10m/s at 53 deg. sout of west : => 10 x cos 53 = 6.01 m/s (west) => v1 => 10 x sin 53 = 7.98 = 8m/s (south) => u1 Solve the other velocity like above: => 12 x cos 25 = 10.87 = 11 m/s (east) =>v2 => 12 x sin 25 = 5.07 = 5m/s (north) = u2 Use the law of conservation of mometum for velocities in noth/south and east/west directions. m1 x(- v1) + m2 x v2 = (m1 + m2) V (V would either be in the east direction or the west direction) m1 x (- u1) + m2 x u2 = (m1 + m2) U (U would either be in the south or north direction) Now after calculating V and U, calculate their resultant using the Pythagorean theorem and then use Tan of theta to calculate the angle between the… [cont.]
Answered by Artemis L - Fri Apr 11 14:08:06 2008

Does it matter which direction a car alternator is turned?
Q. I'm planning to build a 12v generator set using a car alternator. My question is, will the alternator still generate power if turned in the opposite direction? My guess is that it will, since the rotor itself generates AC power, but I wanted to see if anyone had experience with this.
Asked by Pete - Fri Mar 21 00:36:34 2008 - - 5 Answers - 0 Comments

A. An alternator produces alternating current and then has diodes in it to change it to direct current. If it spins backwards, it still produces alternating current, just with a different phase. No, it doesn't matter.
Answered by banjoman - Fri Mar 21 00:44:44 2008

What is the direction of the magnetic field when a current is moving through a wire?
Q. I'm confused between the direction of the magnetic field and direction the force exerted on the charged particle. Do these two variables change with the direction of the current?
Asked by Chill - Tue Mar 16 19:05:54 2010 - - 1 Answers - 0 Comments

A. yes. the polarity changes with the direction of the current. use the right hand grip rule to find it.
Answered by Vansig - Fri Mar 19 00:37:45 2010

Finding the speed and direction of a plane?
Q. A plane is traveling between two cities that are 2000 miles apart. The destination city is due north of the departure city. The arrival timeis to be 2pm. The departure time is 10am. There is also a NNE (N 22.5 E ) wind at 20mph. What is the plane's speed and direction?
Asked by Dancing Stars - Sat Apr 12 21:13:24 2008 - - 7 Answers - 0 Comments

A. This would be more a math topic. To answer this under this context, you would have to assume that the aircraft flys in a straight line, but this is not the case. Aircraft fly by great circle routes for long distance flights due the Corlois effect, as this route is the most direct. Also aircraft also fly IFR, meaning that they do not always fly in a straight line. Wind speed also has a factor in speed and direction, as the altitude increases, the speed and direction of winds change, and change throughout the course of the flight, so the speed on one part of the flight, may not be the same as another part of the flight. Another factor, is that the locations may not be on the same time zone, even if they are due north of each other. Mexico… [cont.]
Answered by captsead0nkey - Sat Apr 12 21:23:16 2008

Is it wrong to lay wood flooring in a different direction?
Q. Does the wood flooring HAVE to all run in the same direction from room to room? The wood in our kitchen, living room, dining area, and hallway that lead into the bedrooms all go in the same direction, but we decided to go in a perpendicular direction in the master bedroom because I was always told to lay the floors in the direction of the light coming in through the main window. So naturally, with the window being where it is, the floors ended up going in a perpendicular direction. It's too much work to change it back now, but I was just wondering if it's so bad. Also, since it is the way it is, should we just run the wood in our second bedroom in a perpendicular direction to make it look consistent with the master bedroom (the light in… [cont.]
Asked by socalteacher - Sat Jul 7 13:39:56 2007 - - 10 Answers - 0 Comments

A. What a great thing to do, "be different". I'm not so sure about the "running the floor in the same direction as the light", thing sounds ole school to me but...As far as the other bedrooms. I think I would run them in the same direction as your bedroom. Like you said, this would make them look planned that way. If you are worried about it looking funny, you may want to try a rug in front of the doors. Or start the floor in one direction, as a frame, then run it the other. If you look at parque floors, each piece is laid in the opposite direction. I happen to think you have a great sense of style. Keep up the good work and quit worrying about it. After all, being the "odd ball" can be a good thing. Have fun and continue to use your… [cont.]
Answered by sillyswede99 - Sat Jul 7 14:07:15 2007

What direction do you close horizontal mini blinds to prevent others from looking inside?
Q. I know depending on the direction, I can see out of the blinds when they're closed, and the other direction I can't. Is it the same from outside? So if you're not on the ground floor the blinds go down on the inside? That means if I'm able to see out of the windows, people outside can see in? I meant to say, if I can see outside between the blinds while they're closed, people outside and downstairs can see into my place?
Asked by Rebbie - Thu Mar 29 02:18:59 2007 - - 5 Answers - 0 Comments

A. first floor - they go up - on the inside second floor and above - they go down inside final answer
Answered by tomkat1528 - Thu Mar 29 02:22:56 2007

What is the direction of the current in wire 3? What is the direction of the magnetic field at Y?
Q. 3 wires carry a current. The direction of the currents for wires 1 & 2 point up. Wire 3 points horizontally.The current in wire 1 is smaller than current in wire 2 (I1 < I2). At point X, the magnetic field is zero (B=0). X is equidistant to all 3 wires. Y is located in same direction as wire 2.
Asked by bklonging - Sun Feb 24 23:40:35 2008 - - 1 Answers - 0 Comments

A. Using the right hand rule, the magnetic field between wires 1 and 2 is out of the page since I2>I1. Since B=0 at x equidistant from all three wires, the B field from wire 3 must be into the page at x. Using right hand rule current in wire 3 must be to the left. Assume Y is closer to wire 2 than point x is. B field to left of wire 2 is out of page, to right of wire 2 is into page
Answered by oldschool - Mon Feb 25 00:08:36 2008