The motion detector used in a physics lab sends and receives 45 kHz ultrasonic pulses. A pulse goes out, reflects off the object being measured, and returns to the detector. The lab temperature is 21.4339oC.
How long does it take for a pulse that reflects off an object 4.0933 m away to make a round trip?

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i want to block a motion detector from working so I put eletrical tape over the sensor. will it stop the motion detector from detecting motion?

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What does a motion detector need to set off an alarm?
i know the answer is something to do with infrared radiation because that is the topic we are doing in physics.

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Hi! This is so frustrating……I bought an IR Motion Detector (along with other Quorum Products) a long time ago and now find that NO-ONE has instructions on how to use it. Quorum does NOT offer any support whatsoever for any of their electronics and it seems like there are many on-line looking for the same manuals for the same unsupported products. Anyone have one of these? I would very much appreciate a copy of the instructions.

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I have created a motion detector program using Visual Basic. The program plays a wav file "Intruder Alert!!" upon detecting a motion. Now my question is how do I send signals to a remote alarm wirelessly? Any ideas? Any cool tutorials? What I have thought of is a simple trasmitter-reciver pair connected through serial port of the computer. But I don’t know how to start. Thanks in advance

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But motion detector still doesnt work,,,any ideas,,,checked breaker,,it had tripped, reset it as well.

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The motion detector for the Playstation, which I believe is called the Move. Is it worth the 0? What games can you play with it? I know Heavy Rain, Little Big Planet 2, and the Michael Jackson game.

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Can I install a motion detector vacancy switch without using red wire? The switch box only has black and white. Is there a way without running new wiring to the wall switch box? Thanks.

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A stationary motion detector sends sound waves of 0.120 MHz toward a truck approaching at a speed of 55.0 m/s. assume the speed of sound is 343.0 m/s
What is the frequency of the waves reaching the detector after reflecting on the truck?

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An astronaut sits on a chair that vibrates horizontally at the end of a string. A motion detector determines the amplitude of vibration and the speed of the chair as it passes through equilibrium position. The spring has a 1200N/m spring constant, the amplitude of vibration is 0.5m, and the speed of the chair as it passes through equilibrium is 2m/s. Using this data what is the combined mass of the chair and the astronaut.

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