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I am assuming you are referring to the accelerometer that allows the phone to change from portrait to landscape when the phone is turned. If so, read on... remember-you wanted technical!
An accelerometer measures the non gravitational acceleration it experiences.[1] By definition, non-gravitational acceleration is that which is produced by forces other than gravity or inertial/fictitious forces. Such forces include all simple mechanical forces. These are transmitted to the accelerometer device through mechanical stress on its mounting.
The result of such forces, and the output of the accelerometer, is typically expressed in SI units meters/second2 (m/s2) or popularly in terms of g-force. It does not measure the "acceleration" due to gravity, and an accelerometer in free fall in a gravity field, even though being accelerated, will read "zero." This includes use in an earth orbiting spaceship.
When held stationary or moving at constant speed in a gravity field by a support, the output of an accelerometer has an offset due to local gravity. The force applied by the support means that, perhaps counter-intuitively, the accelerometer will indicate 1 g along the vertical axis away from the Earth. The accelerometer is simply measuring the inertial acceleration due to this external force (which thus points in a direction opposite its weight, and compensates for its weight so as it keep it motionless in the gravitational field.)
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What is a repulsine?
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In my office lights turn on automatically when I enter the room how does it know that I am in the room?
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A unique feature called Gravity Sensor that allows users to switch between the SIMs by rotating the handset to 360 degrees.
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It does. Gravity works on all matter
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Yes. Gravity always works.
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Why is gravity caused by earths magnetic field?
It isnt. Two different forces; gravity and magnetism. As for how gravity works; all objects have their own "gravity", the bigger they are, the more gravitational pull they have. Why gravity works; nobody knows or we would all have flying cars.
What you want to know about science?
How gravity works.
