Grain elevator explosions are most likely caused by the ignition (through friction or static electricity) of grain dust that floats in the air within the grain elevators. This same type of explosion can be found in soap factories and candy factories.
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Why is the elevator a good example of an inclined plane?
An elevator on a airplane are tabs on the tail that control its up and down motion in the air
A lift
When the elevator starts moving down, the time period increases. But when the elevator is descending at a constant velocity, the time period returns to its normal.
Mr.Otis