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  1. i suppose the BAR MAGNET you mentioned is PERMANENT MAGNET, correct? the problem of using such permanent magnet in a weight lifting machine is the magnetic force of such magnet is weak, hence it cannot lift lot of weight. well you...

  2. 這好似有點兒錯啊! 所有有質量的物質在地球上都會被地球的地心吸力吸住,包括空氣(則air molecules也會被吸),我可以告訴你的是,如果air molecules不被gravity吸住,地球上的所有空氣也會飛出太空。 補充一點資料,連光(質量近乎0)在地球上也會有一點兒...

  3. ...front of an approaching car? The frequency will be increased instead of decrease. What is the advantage of placing the detector behind...

  4. actually it is a chem question instead of phy question when 電髮, 藥水is added in order to weaken the bond of...

  5. ...water is vaporized, the temperature will not be increased. Instead , there is a physical change that water is vaporized to steam, which...

  6. ... if μsW > Fmin = Wl/(2h), then the block will tip instead of slide. Simplifying: μs > l/(2h) Conversely, if μs...

  7. 1.a. It should be 4 ms^-1 instead of 4ms^-2, because it is referring to velocity. When the metal...

  8. ...type Christmas. It will only say "at Christmas" instead of "on Christmas" Evidence 2: Go to ...

  9. ...black colour is bad conductor of heat , so it absorbs heat instead of reflecting it. So it can absorb heat more efficiently , hence reduce...

  10. ... = 85 J Note that gravitational acceleration used is 10 instead of 9.8. If you use 9.8, you will get 83.8 J instead .