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Bookmark or Share- How can you measure frequencies in the human body? - Physics ForumsIn summary, a stethoscope can pick up a range of audio frequencies, a sensitive microphone can detect a much wider range, and of much lower power, a spectrum analyzer will show you the frequencies in signals your microphone picks up, EEG and EKG machines pick up different frequencies, and a measured change would indicate a problem.
- I get shock when I touch Grounding (earthing) wire - Physics Forumsa friend who's in airconditioning business once asked me how to check grounding on an outdoor unit. He had a rooftop unit that was corroding severely, eating the aluminum fins off the condenser coils. Incoming 230V looked fine by voltmeter. He located the earthing wire at point where power came into the building on ground level.
- Aluminum and copper -- Galvanic corrosion - Physics ForumsIf a copper water pipe is connected to a piece of aluminum through a copper wire, where will the galvanic corrosion take place? On the wire to aluminum joint eating away at the aluminum, or will the whole water pipe suffer? (does copper corrode aluminum, or vice versa, or each other?) thanks
- The physics behind human whistling-where does the sound come from?In summary, the physics behind human whistling involves air being split and creating vibrations. The mouth acts as a resonance chamber and can alter the pitch by moving the tongue and palate.
- How Do You Determine Fx and Fy in a Rigid-Body Equilibrium Problem?A uniform steel beam of length L and mass m1 is attached via a hinge to the side of a building. The beam is supported by a steel cable attached to the end of the beam at an angle theta, as shown. Through the hinge, the wall exerts an unknown force, F , on the beam. A workman of mass m2 sits eating lunch a distance d from the building.
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