an empty density bottle has a mass of Xgrams. it is 50 grams when full of water and 45 grams when full of another liquid of density 800 kgm-3. calculate the mass of empty density bottle

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

iron would move it is magnetic there is a mag field around the current in the wire

e/c, where e is its total energy

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