Answer to Question #231907 in Physics for Rina

Question

 a friend ask to borrow your precious diamond for a day to show their family. you are a bit worried, so you carefully have your diamond weighed on a scale which reads 8.17 grams. the scales accuracy is claimed to be +-0.05 grams. the next day, you weigh the returned diamond again, getting 8.09 grams. is this your diamond? justify your claim.

Answer 1

There may be different answers.

1) This can be my diamond, but the friend somehow took a small piece of it. Why? Assume the real weight is 8.12 g. When we weighed the diamond, it was 8.12+0.05=8.17 g (we add the accuracy)

2) This can be another diamond because its mass is smaller than the range of mass within the scales' accuracy.