commonjcb | 5 years ago | on: NASA Funded Scientists Claim Breakthrough in Propellantless Propulsion
commonjcb's comments
commonjcb | 5 years ago | on: NASA Funded Scientists Claim Breakthrough in Propellantless Propulsion
The torsion balance introduces fixed biases, and can be operated only in XY plane. So in theory you're right, in practice it's not possible.
Not canceling earth's magnetic field (an easy thing to do) when measuring microNewtons at high currents is just very poor experimental practice. Unprofessional. Amateur.
commonjcb | 5 years ago | on: iPhone audio detectable with AM radio
Approximately the same distance as a good microphone can pick up the audio anyway. Read about near-field vs far-field:
commonjcb | 5 years ago | on: NASA Funded Scientists Claim Breakthrough in Propellantless Propulsion
Not this shit again...
Look closely at the picture of the test chamber in the article. Do you see Helmholtz coils surrounding the entire apparatus? Nope.
https://en.wikipedia.org/wiki/Helmholtz_coil
It's the same story as the EMdrive: they run something at high current, without cancelling earth's magnetic field.
high current + earth magnetic field = force. This method is used to move satellites:
commonjcb | 5 years ago | on: iPhone audio detectable with AM radio
It's probably by design, iPhones support magnetic-induction hearing aids, see here:
https://support.apple.com/en-us/HT202186
The are 2 standards, the old "telecoil" (direct) and the new FM loop, both operating at low frequencies...
Both work at very short ranges (inverse cube of the distance)
page 1
https://en.wikipedia.org/wiki/Lorentz_force#Force_on_a_curre...
"When a wire carrying an electric current is placed in a magnetic field, each of the moving charges, which comprise the current, experiences the Lorentz force, and together they can create a macroscopic force on the wire (sometimes called the Laplace force)."