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04.04.2020 •
Physics
A person walks in the following pattern: 3.0 km north, then 2.1 km west, and finally 4.2 km south. (a) How far and (b) at what angle (measured counterclockwise from east) would a bird fly in a straight line from the same starting point to the same final point?
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Ответ:
(a) 2.42 km
(b) 119.74°
Explanation:
(a)
The shortest distance from starting to end point is the hypotenuse
Where a is is base and b is height. Substituting 1.2 km for a and 2.1km for b then
(b)
The angle is given by the
as indicated in the sketch
Towards East it will be 180-60.26=119.74°
Ответ: