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hemriccaleb1213
20.01.2020 •
Physics
Astring runs up and to the left in thexyplane, making an angle of 39 degrees to the vertical. determine the unit vector that points along the string.
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Ответ:
Explanation:
Vectors
It's an element that has both magnitude and direction. It can be geometrically represented as a directed line segment whose length is the magnitude and the arrow points in its direction. There are several ways to mathematically represent a vector. The most commonly used are in the polar and rectangular coordinates. In the polar form, a vector has a magnitude and an angle measured respect to the horizontal right direction. It's written as . The rectangular representation has the two coordinates (x,y) measured in the known plane xy. The conversion between both systems is
A representation of the vector is shown in the figure below. The angle of
is measured respect to the vertical, we must add
to make it compliant with the standard expressions of vectors. We have r=1, ![\theta=39^o+90^o=129^o](/tpl/images/0462/8901/11364.png)
The unit vector is
Or equivalently
Ответ:
Work W = 0
Explanation: Work W = F·s. Because rock does not move, s = 0 and
work done is zero.