The length of a rectangular metal strip is obtained by subtracting two scale readings: and

PHYSICS · Subjective · CBSE · Physics · Units and Measurements · Units and Measurements

Problem

The length of a rectangular metal strip is obtained by subtracting two scale readings:

x_{1}=30.00\,\text{cm}\,\pm0.05\,\text{cm}

and

x_{2}=5.00\,\text{cm}\,\pm0.05\,\text{cm}

. Its width is measured directly as

w=10.00\,\text{cm}\,\pm0.10\,\text{cm}

. Calculate the area of the strip and its absolute uncertainty, expressing the final answer with the proper number of significant figures.