Three of the following sensors can be used to detect presence of an object. Which one cannot?STRAIN GAUGEO CAPACITIVE SENSORIR LEDO ULTRASONIC SENSOR

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Three of the following sensors can be used to detect presence of an object. Which one cannot?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter24: Magnetic Fields

Section24.2: Forces Caused By Magnetic Fields

Problem 24PP

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

Three of the following sensors can be used to detect presence of an object. Which one cannot?
STRAIN GAUGE
O CAPACITIVE SENSOR
IR LED
O ULTRASONIC SENSOR

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