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Which sensor type detects a side impact?

  • A.A pressure sensor in the door cavity
  • B.The central accelerometer alone, which detects the lateral acceleration and therefore triggers the side airbags
  • C.A camera
  • D.A pressure sensor sensing the rapid rise as the door cavity is crushed, giving a faster signal than acceleration alone

Answer: A

Crushing the door raises the pressure in the sealed cavity almost instantly. The last option explains exactly why it is faster than acceleration sensing, which makes it a correct and more instructive version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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