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Physics Problem: Displacement, Acceleration, Velocity |
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| Sep8-04, 09:55 PM | #1 |
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Physics Problem: Displacement, Acceleration, Velocity
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? |
| Sep8-04, 10:11 PM | #2 |
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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 |
| Nov9-11, 10:16 PM | #3 |
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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
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| Nov9-11, 10:23 PM | #4 |
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Physics Problem: Displacement, Acceleration, Velocity
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 lenght 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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