Question 16: People carry out 3 weighings as follows using a Robecvan balance: Weighing 1: Balance plate on the left: the bottle has 250cm3 of liquid + object. Right plate: 500g weight. Weighing 2: Left pan: empty jar + object. Weight pan right: weight 300g Weight: Weight plate left: empty jar Right balance plate: weight 230g. Calculate the mass of the object.
Answer A
+ From weighing 2 and 3, we infer the mass of the object: mv = 300 – 230 = 70g.
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