course phy 121 x۠]ŀĦK̘ݎӲassignment #021
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22:47:06 Explain how to obtain the final speed and direction of motion of a projectile which starts with known velocity in the horizontal direction and falls a known vertical distance, using the analysis of vertical and horizontal motion and vectors.
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RESPONSE --> Find the vertical vf using vf^2 = vo^2 + 2a*ds. Where v0 = vert v0 = 0, a = 9.8m/s^2 and ds is known. Then vert vf ^2 + known horiz v ^2 = magnitude of motion. To find direction: arctan (vert vf / horiz v)
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22:57:46 Give at least three examples of vector quantities for which we might wish to find the components from magnitude and direction. Explain the meaning of the magnitude and the direction of each, and explain the meaning of the vector components.
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RESPONSE --> Enter, as appropriate, an answer to the question, a critique of your answer in response to a given answer, your insights regarding the situation at this point, notes to yourself, or just an OK. Always critique your solutions by describing any insights you had or errors you makde, and by explaining how you can make use of the insight or how you now know how to avoid certain errors. Also pose for the instructor any question or questions that you have related to the problem or series of problems. Vector quantities have direction and some examples are displacement, velocity, force and acceleration. I think the second part of this question gets to the root of my confusion of this topic. I'm not real clear WHAT the magnitude and vector components mean in each situation. Displacement is pretty easy. The magnitude is esentially how far the object is displaced and direction is clearly in which direction the object moved. The vector components in displacement seem to mostly just aid in figuring the magnitude and direction more than having any realy meaning. In force the mag is how strong the force is and the direction is once again in which direction the force is applied. The vector components can (I think) help determine how much force is applied from different directions.
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22:58:44 ** GOOD STUDENT RESPONSE: Examples might include: A force acting on an object causing it to move in an angular direction. A ball falling to the ground with a certain velocity and angle. A two car collision; velocity and momentum are both vector quantities and both important for analyzing the collision.. The magnitude and directiohn of the relsultant is the velocity and direction of travel. The vector components are the horizontal and vertical components that would produce the same effect as the resultant.
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