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jrmhlocomotoguy510
28.08.2020 •
Physics
A truck travels due east for a distance of 1.9 km, turns around and goes due west for 9.3 km, and finally turns around again and travels 3.4 km due east. What is the total distance that the truck travels? What are the magnitude and direction of the truck's displacement?
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Ответ:
The total distance of the truck is 14.6 km
The magnitude and direction of truck's disaplacement is 4 km east
Explanation:
Distance is the total path covered by the trcuk regardless of the direction since distance is described by magnitude only.
The total distance traveled by the truck is given by;
Total Distance = 1.9 km + 9.3 km + 3.4 km
Total Distance = 14.6 km
Displacement is the change in postion at a time interval. In dispalcement direction is considered.
let eastward motion be positive
let westward motion be negative
Displacement = 1.9km east - 9.3 km west + 3.4 km east
Displacement = -4 km east
Therefore, the magnitude and direction of dispalcement = 4 km east
Ответ:
The uniform motion ratios allow finding which intervals have constant velocity, the correct answers are
BC Positive velocity
CD Zero speed
DE Negative velocity
Kinematics studies the movement of bodies, establishing relationships between position, velocity and acceleration. In the special case that the acceleration is zero the motion is called uniform movement
v =![\frac{\Delta_x}{\Delta t}](/tpl/images/0889/3155/4ac7d.png)
Δx = v Δt
Where v is average velocity, Δx is the position variation and Δt is the time variation in the analyzed interval.
This equation we see that the relationship between displacement and time is linear, let's analyze each interval given in the graph
AB interval
In this interval the graph shows a curve whereby the movement is accelerated
BC interval
In this interval the graph is a line with a positive slope, therefore the movement is uniform with positive velocity
CD interval
In this part we have a line of zero slope
In motion it is uniform with zero speed, that is, the car is stopped
DE interval
The graph of this section is a line with a negative slope, consequently the velocity is negative.
With this analysis we see that the only interval that the movement is accelerated is the AB interval
In conclusion, using the uniform motion relationships we can find that intervals have constant velocity, the correct answers are
BC Positive velocity
CD Zero speed
DE Negative velocity
Learn more about average speed here:
link