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Dec
10
awarded  Popular Question
Oct
21
awarded  Notable Question
Oct
18
asked In practical, how to find the friction of rubber vs plastic?
Sep
21
awarded  Notable Question
Aug
31
awarded  Popular Question
Aug
16
awarded  Popular Question
Jun
18
awarded  Notable Question
Mar
26
comment Which is a more effective cooling method?
If I use ideal gas equation, PV/T = constant. Since V is the same, T decreases when P decrease. Does it mean that the refrigerator will be easier go to a lower temperature?
Mar
25
asked Which is a more effective cooling method?
Dec
26
comment Why is the Earth self-rotating?
Thanks for the information. Your information include why it keep on going and the resistance by tide. Does any force assist to the self rotating?
Dec
26
asked Why is the Earth self-rotating?
Oct
14
awarded  Notable Question
Sep
3
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2
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Jun
8
revised Why my simple electromagnetic experiment does not work?
added 81 characters in body
Jun
8
comment Why my simple electromagnetic experiment does not work?
@rob Do you mean the weight of the magnet? The magnet is NOT the whole middle piece. The 90% of the "middle piece" is plastic. The magnets are 1" diameter x .5" thick only
Jun
7
accepted Is it right to cut a slot on some material before bending?
Jun
7
accepted Would two Neodymium magnets stick together with twice the power?
Jun
7
comment Why my simple electromagnetic experiment does not work?
I have considered the acceleration problem, that why I put the initial position of the middle piece to swing to ONE side. The magnetic force have a 1/distance^2 relation. I would expect to see at least one big move. Isn't it?
Jun
7
comment Why my simple electromagnetic experiment does not work?
The circuitry is only a coil and resistors. I used a ohmmeter to measure the total resistance. The total resistance is valid.