A helicopter takes off vertically from ground and stays in air for 12 hrs. Where will it land and Why?
464776
I am assuming that they are assuming that there is absolutely no air acting on the helocopter except to keep it up AND that the helocopter pilot can somehow go directly straight up and down perfectly without drifting one way or another due to bad control.\n\nOK there is gravity acting on the helocopter, and it's initial velocity is the velocity of the face of the earth. So again you have to make an assumption: Is the helocopter on the equator, one of the poles, or somewhere in between? If the helocopter is on the North or South pole, then it will land exactly where it took off. However, if the helocopter takes off from a point on the equator, it will remain a the same lateral velocity as the surface of the earth, but it's distance from the center of the earth (raduis of the circle it is traveling on INCREASES. This means that the earth will continue on to the EAST, so the helocopter will land somewhere slightly to the WEST of where it started!\n\nNow if the chopper is anywhere between the equator and the pole, the distance it travels to the West depends on how far from the pole it is. We know it will not move from it's spot on the pole, and we know it will move the furthest at the equator. So the distance would be somewhere between those two. But there is MORE... If you are not on the equator, you have a north or south component to your velocity because of the fact that you are tuning to the side in a circle away from the equator. This makes sense when you consider that you are rotating in place when you are on the pole. So in addition to landing slightly west, you would also be flung slightly toward the equator for and starting spot between a pole or the equator. So the answer is that if you are in the northern hemisphere, you will drift slightly SOUTHWEST, and if you take of in the southern hemisphere, you will drift slightly NORTHWEST.\n\nThe teacher may as you, "how can we tell how far to the west we will drift?" Well remember the difference in radius between the earth surface and the height of the chopper? Well the higher you go in that 12 hour span, the slower your angular velocity, meaning the longer it takes you to travel along the circle you are tracing. Obviously if you climb up 1 foot, you will not be very far from where you started 12 hours later, however, if you use you imagination, and rise up to 1,000,000,000 miles in a second(assuming you ignore gravity from the sun and other planets), and drop back down to earth in the last second, you would be very close to the other side of the world. So somewhere between those two extremes is exactly how far you will drift.\n\nDon't be tempted to think that the helocopter will be in space somewhere due to the idea that the earth is moving around the sun because that becomes negligible when you consider the strength of gravity at a low altitude.\n\nIf your teacher wants you to assume the atmosphere is acting on the helocopter then you need a meteorologist to determine where the helocopter lands.
664508
because of inertia it will be traveling at 60mph as it leaves the car\nbecause of the fly's body shape theoreticaly it would give it lift assuming that the fly was facing foward\n\nrealisticly it was facing sideways, so the air would be traveling over its body sideways it would have been plummeted into the ground and its wings would have been ripped off
25248
First of all, there is no fixed end to the atmosphere: it gradually fades away to the density of interplanetary space.  However, the effective "top" of the atmosphere is often taken to be 60 miles (100 km), the altitude at which a (typical) unpowered satellite could make one orbit before air drag slowed it and caused it to fall.\nTo reach this altitude only requires that an object be headed upward, no matter how slowly.  To move upward requires that the object have some force propeling it which is at least slightly greater than the force of gravity pulling it down.  This force of gravity lessens with altitude, which is why a rocket needs a lot of power to take off, but little to maneuver in orbit.  Thus there is no minimum speed needed to reach the "top" of the atmosphere.\nHowever, the orbital velocity needed to stay in orbit is that velocity which just equals the downward pull of gravity, so orbital speed depends on the altitude of the satellite: it goes down with altitude.  (For example, at a typical low-orbit altitude of a couple hundred miles or so, the speed is around 17,000 miles per hour and the orbital period for one orbit is around an hour and a half; the Moon, 238,000 miles away, moves about 2000 mph and takes 28 days to orbit once. For mathematical details, see references on Kepler's Laws.
41858
Well, the physics of a helicopter is a very complex subject, but in essence it is only the blades of the helicopter pushing air down on the ground to lift it.  The reason it starts to become complex is because the weight of the helicopter is thrown into the equation and the blades of it work in circular motion.  The helicopter does have a coefficient of friction against it, which does not help the simplicity. \n\n   The blades are angled to enhance the lift momentum. they´re 3 types of blades for helicopters and planes: BLADES WITH NO ANGLE ATACK, WITH SLIGHT ANGLE ATACK AND WITH STEP ANGLE ATACK.\n\nAlso the blades spin in one direction, forcing the helicopter to actually spin in the other direction:\n\nWithout the rear blade the helicopter would just spin due to Newton's third law and action-reaction forces.  The third law states that "when one object exerts a force on a second object, the second exerts a force on the first that is equal in magnitude but opposite in direction"\n\n    Action-Reaction forces means that for every force that the blades exerts, the body of the helicopter will spin proportional.\n\nThe Rotor, blades in the rear, keep the helicopter going straight.  They always oppose the force made by the blades.\n\nIN THE SOURCE PAGE I GAVE YOU YOU´LL FIND ALL THE EQUATIONS AND ANSWERS YOU NEED ABOUT THIS TOPIC.
1032126
Yes, the helicopter will hover and will not travel to the rear of the car. If, and only if, your speed stays constant. In this case the car's speed  is 80mph. Any acceleration, even by 1mph, will cause your helicopter to travel rearward.  That's because speed is all relative. In this case the car, and everything inside of it, including the air, is traveling at 80mph.  The ground or road is at a stand still, compared to, or relative to the car which is moving.\nTry this simple demonstration. While traveling at a constant speed, 30mph, 50mph, or whatever, as long as your speed stays the same. Using two cups, raise one cup, which is filled with water, about a foot or two above the other cup. Pour the water into the the lowered empty cup. If you're good, you shouldn't spill a drop.  Now try it again, but this time as you are pouring the water, ask your driver to accelerate. You're going to get wet!\nIt's all about physics. Once an object is in motion, it wants to stay in motion. It takes an outside force to change that motion. In the case of your helicopter hovering in a car going 80mph, all matter inside your car wants to stay at 80mph, so accelerating or decelerating, by stepping on the gas pedal, or hitting the brakes is the outside force which will change that motion.\nHope I was helpful in answering your question?
1046911
it will fall straight down , but appear to fall at an angle if observed from the plane
993555
In a vacuum, both objects will land at the same time.
318576
you could fly to remote places and land in a small area of space, no run-way or lake required. Or not even land but hoover and lower/raise people/items.
821350
Think of it this way:  Once the plane is off the ground it is part of a mass of air that is likely moving in some direction (think wind).  The airplane moves through this mass of air at a constant velocity depending upon the power setting, load factors, etc.  The speed of the airplane is independent of the speed of the air mass.  The speed of the airplane over the ground consists of its speed in the air plus or minus the speed of the air mass over the ground adjusted for the direction the airplane is moving in relationship to the speed and direction the air mass is moving. \n\nA couple of examples might help.  Suppose that the airplane flies at 200 knots (about 230mph).  It is heading due east.  The airmass is also moving due east at 30 knots.  So, the ground speed of the airplane is 230 knots.  If the airplane were heading northeast then the ground speed would be 200 knots of air speed plus 21 knots (NE component of an air mass moving at 30 knots due east).  If it were heading due west then the ground speed would be 170 knots (200-30).\n\nWhat if it were heading directly to a spot 200 nautical miles to the north?  It would take slightly over an hour to get there.  Why?  Because to get to a spot due north on the ground the airplane would have to head west a bit to keep from going east of the spot it was flying to because the air mass was moving east.  In fact, it would take about 61 minutes and the airplane would have to head about 9 degrees west of north to keep from moving east.  The moving air mass would keep it on the north-south line between the starting point and destination.\n\nGot it?
23313
The UH-1N is a twin-engine helicopter\nhttp://www.hqmc.usmc.mil/factfile.nsf/0/0fcbc129ac3dd43c8525626e0049668b?OpenDocument
1053885
It is very beneficial to aeronautics as different layers of the atmosphere have different pressures and affect how a plane or shuttle flys.  Similarly a helicopter can only maintain its altitude within very low levels of the atmosphere.
368139
If the object has onboard power, then the speed is not really relevant to whether it will leave the atmosphere, just when. If you just fire an object upwards and it has no self-propulsion, however, then you need to calculate the change in gravitational potential energy (find out how far the atmosphere extends) and add the energy lost to air friction (this depends on velocity). Equate this to the object's initial kinetic energy and solve for initial velocity v. Your initial velocity will have to be larger than this.
123066
Because there is no air, yet at the same time they need to hit the air so they can get lift for a soft landing.  The problem is that the air that does exist at such high altitudes is so sparse that it doesn't have the density to provide the lift, so it ends up hitting the craft at a super fast speed which heats it up.  Eventually however, the air is dense enough to provide the lift that it needs.
47938
The first answer is correct. I think for the second answer, the questioner would probably be wondering...well, if the helicopter takes off with the same velocity as the earth, since the heli is now hovering and the earth keeps on turning, why doesn't the earth spin past the helicopter...\n\nAnd that is simply because the atmosphere is turning around with the heli, like the first answer stated.\n\nJust wanted to elaborate with another example. A fly takes off from the dashboard of a speeding car with its windows closed. Does the fly stay in air or, since the fly is now seperated from the car, does the car rush forward, making it seem like the fly is hurtled to the back of the car?\n\nEven in this case, the air inside the car is being brought along with the car at the same speed. Therefore, the speed of the fly relative to the car will always be 0.
32
A helicopter gets its power from rotors or blades. When its rotors are spinning, a helicopter doesn't look much like an airplane. But the rotor blades have an airfoil shape like the wings of an airplane. So as the rotors turn, air flows more quickly over the tops of the blades than it does below. This creates enough lift for flight.
347023
If you jump, you will be moving at the same speed as the vehicle just before you left the floor.\n\nWhen in the air, if the vehicle is accelerating, the vehicle will move forward faster than you and consequently, you will land some distance from where you jumped and vice versa.\n\nIf on the other hand, the vehicle was not accelerating, you will land at the exact place you jumped from. Of course, this is not counting air resistance.
185776
I'm very much a realist, but I have one story I cannot expalin.\n\nI was watching what I thought was a helicopter off the coast of Maine.  It was hovering and slowly moving around an island roughly seven miles away.  It was late afternoon, so the light was fantastic and the air, for once, was very clear.\n\nThis object slid back and forth maybe 3000-4000 feet high (triangulate from the distance) and then it did two strange things:  it sort of oscillated in a tight radius back and forth, like lint getting sucked down a bath drain, and then it just winked out of sight.  It didn't exactly disappear all at once, rather, it kind of took a moment or two.  I thought it might had slipped into a fog bank, but there was no fog; I could see distant color in the sky.\n\nI don't think about this experience so much anymore.  But I do get chills when I do recall that day.  I have no explanation, and I offer no theories.  But that's my story.