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chantellejames4073
27.05.2020 •
Physics
A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 7.2 m/s. During the second part, she rides for 36 minutes at an average speed of 5.1 m/s. Finally, during the third part, she rides for 8.0 minutes at an average speed of 13 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is her average velocity for the trip? (Ans: a)26.7km, b) 6.74m/s)
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Ответ:
a
The total distance traveled is![D = 26760 \ m](/tpl/images/0667/3370/040f4.png)
b
The average velocity is![v_{avg} = 6.8 \ m/s](/tpl/images/0667/3370/fddc9.png)
Explanation:
From the question we are told that
The time taken for first part![t_1 = 22 \ minutes = 22*60 = 1320 \ s](/tpl/images/0667/3370/0f5d7.png)
The speed for the first part is![v_1 = 7.2 \ m/s](/tpl/images/0667/3370/476de.png)
The time taken for second part is![t_2 = 36 \ minutes = 2160 \ s](/tpl/images/0667/3370/c3550.png)
The speed for the second part is![v_2 = 5.1 \ m/s](/tpl/images/0667/3370/e21dd.png)
The time taken for third part is
The speed for the third part is![v_3 = 13 m/s](/tpl/images/0667/3370/421af.png)
Generally
Therefore the total distance traveled is
substituting values
Generally the average velocity is mathematically represented as
Where
is the total time taken which is mathematically represented as
The average velocity is
Ответ:
mr. Garcia works at the post office
Explanation:
i just know don't question it.