Two metal rods have lengths and

PHYSICS · Multi-part · A Level · Physics · Measurements and their errors · Measurements and their errors

Problem

Two metal rods have lengths

L_{1}=6.035\times10^{2}\,\text{cm}

and

L_{2}=2.41\times10^{3}\,\text{mm}

. A third rod has length

L_{3}=7.950\times10^{0}\,\text{m}

. Using appropriate unit conversions where necessary, find: (i) The combined length

L_{1}+L_{2}

expressed in metres in scientific notation. (ii) The difference

\bigl(L_{1}+L_{2}\bigr)-L_{3}

, expressed in scientific notation and rounded to four significant figures.