Uncertainty question?

2 ⤊

Uncertainty question?

A rectangular plate has a length of (21.8 ± 0.2) cm and a width of (9.2 ± 0.1) cm. Calculate the area of the plate, including its uncertainty.

So far I got 200.6 ± ?? sq. cm

I'm just not sure how to find the uncertainty.

2007-09-05 13:37:14 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics

2 answers

The product of the nominal dimensions is 200.56. Calculate the minimum area as the product of the minimum two dimensions (=196.56). Do similarly for the maximum area (=204.6). You can express these results as 200.56 +4.04/-4.00 or 200.58 +/-4.02. Both forms are acceptable, but I'd prefer the former because it explicitly states the nominal area.

2007-09-05 13:56:01 · answer #1 · answered by kirchwey 7 · 1⤊ 0⤋

200.56(plus or minus)4.04

2007-09-05 20:53:40 · answer #2 · answered by cricketr77 2 · 1⤊ 1⤋