Physics Problem: Displacement, Acceleration, Velocity

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Homework Help Overview

The discussion revolves around a physics problem involving a skateboarder rolling down an inclined ramp, focusing on concepts of displacement, acceleration, and velocity. The problem includes calculations for acceleration and components of acceleration on an incline, as well as a separate displacement problem involving a car traveling along a square path.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants explore the relationship between acceleration, velocity, and time for the skateboarder, with one suggesting the use of gravitational components. Another participant questions the expression of average velocity in terms of final and initial velocities.

Discussion Status

The discussion is ongoing, with participants offering various approaches to the skateboarder's problem and raising questions about the calculations involved. Some guidance has been provided regarding the use of diagrams and formulas, but no consensus has been reached on the methods or interpretations.

Contextual Notes

Participants are working under the constraints of the problem's parameters, including the ramp's angle and the skateboarder's initial conditions. The second problem introduces a new context regarding displacement and average velocity in a geometric scenario.

shawonna23
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A skateboarder, starting from rest, rolls down a 11.0 m ramp. When she arrives at the bottom of the ramp her speed is 7.20 m/s.

(a) Determine the magnitude of her acceleration, assumed to be constant.

(b) If the ramp is inclined at 24.5° with respect to the ground, what is the component of her acceleration that is parallel to the ground?
 
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(a) Since the skateboarder is on an incline, a = g sinθ. To find the time it takes to descend, find the average velocity v = (vf - vi)/2. We know that t = distance/velocity, or in this case, 11/3.6. Using a = v/t, you can find that θ = ArcSin v/gt.

(b) If you draw a diagram of the problem you'll see that the x-component of acceleration is ax = a cos24.5
 
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Average Velocity = (vf+vi)/2 and acceleration = (vf-vi)/t please could you explain how average velocity has been expressed as vf-vi over 2
 
Displacement Problem:
A car travels at a speed of 5 m/s along a square root ABCD find its displacement and average velocity from A to B, from A to C and from A to D i.e from A to all the corners with length of one side of the square is = 20 m.
Find dispacement and average velocity:
i- from A to B
ii- form A to C
iii- from A to D
 
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