ayoismeisalex
12.01.2021 •
Physics
Cindy pushes a bookshelf with all her strength (50N to the right) and it doesn't move a single inch! The bookshelf weighs 200N. How much work did Cindy do on the bookshelf?
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Ответ:
0J, hence no work was done.
Explanation:
Step one:
given data
Applied force F= 50N
The bookshelf weighs 200N
Distance moved= 0 m
Going by the definition of work done "it is the application of force F along a distance"
Now from the scenario, yes Cindy applied a force even all her strength worth 50N, but the shelf did not even move an inch, hence no work was done, because
Work- done= Force* distance
Work- done= 50*0
Work done= 0J
Ответ:
Answer is: sulfur, arsenic, selenium, silicon and antimony.
1) Sulfur (S) can form, for example, sulfuric acid (H₂SO₄) or acidic oxide, sulfur(VI) oxide (SO₃).
2) Arsenic (As) can form arsenous acid (H₃AsO₃).
3) Selenium (Se) can form selenic acid (H₂SeO₄).
4) Silicon (Si) can form orthosilicic acid Si(OH)₄ and metasilicic acid SiO(OH)₂.
5) Antimony (Sb) can form antimonic acid, as the hydrate HSb(OH)₆.