57)
On and around Earth, all of the following reflect incoming sunlight EXCEPT
A)
desert sands.
polar ice sheets.
heavy cloud cover.
atmospheric carbon dioxide.

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Ответ:

evansh78

17.06.2020

Physics

- 83 J

Explanation:

$\overrightarrow{F}=4\widehat{i}+5\widehat{j}$

$\overrightarrow{r_{i}}=5\widehat{i}+6\widehat{j}$

$\overrightarrow{r_{f}}=-2\widehat{i}-5\widehat{j}$

$\overrightarrow{d}=\overrightarrow{r_{f}}-\overrightarrow{r_{i}}$

$\overrightarrow{d}=\left ( -2-5 \right )\widehat{i}+\left ( -5-6 \right )\widehat{j}$

$\overrightarrow{d}=-7\widehat{i}-11\widehat{j}$

Work done

$W=\overrightarrow{F}.\overrightarrow{d}$

$W=\left (4\widehat{i}+5\widehat{j} \right ).\left (-7\widehat{i}-11\widehat{j} \right )$

W = - 28 - 55

W = - 83 J

Thus, the work done is - 83 J.

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57) On and around Earth, all of the following reflect incoming sunlight EXCEPT A) desert sands. polar ice sheets. heavy cloud cover. atmospheric carbon dioxide.