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  1. ...120 m/s 2A. what is the net force nedded to lift a full grocery sack (weighing 210N) 210 N is needed 2B...

  2. .... Cotton wool is soft and contains plenty of air sacks . When the cotton wool collides with the bottle, the air sacks ...

  3. ...by conduction and radiation. (b) Polyfoam contains plenty of small air sacks inside. Because air is a bad conductor of heat, hence heat loss from the...

  4. Cotton wool contains a lot of small air sacks in it. Since air itself is a good heat insulator, these air sacks ...

  1. 相關詞

    sack