Is 392 a perfect cube? If not, find the smallest natural number by which 392 must be multiplied so that the product is a perfect cube.

Name: Is 392 a perfect cube? If not, find the smallest natural number by which 392 must be multiplied so that the product is a perfect cube.
Uploaded: 2020-06-21
Duration: 3 min 13 s
Description: Is 392 a perfect cube? If not, find the smallest natural number by which 392 must be multiplied so that the product is a perfect cube.

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A person travelling on a straight line moves with a uniform velocity \({v}_{{1}}\) for some time and with uniform velocity \({v}_{{2}}\) for the next equal time. The average velocity \(v\) is given by（）

A. \({v}=\frac{{{v}_{{1}}+{v}_{{2}}}}{{2}}\)

B. \({v}=\sqrt{{{v}_{{1}}{v}_{{2}}}}\)

C. \(\frac{{2}}{{v}}=\frac{{1}}{{v}_{{1}}}+\frac{{1}}{{v}_{{2}}}\)

D. \(\frac{{1}}{{v}}=\frac{{1}}{{v}_{{1}}}+\frac{{1}}{{v}_{{2}}}\)

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