#$&* course PHY 121 7/25 12:30 021. `query 21
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Given Solution: `a** The horizontal velocity is unchanging so the horizontal component is always equal to the known initial horizontal velocity. The vertical velocity starts at 0, with acceleration thru a known distance at 9.8 m/s^2 downward. The final vertical velocity is easily found using the fourth equation of motion. We therefore know the x (horizontal) and y (vertical) components of the velocity. Using the Pythagorean Theorem and arctan (vy / vx) we find the speed and direction of the motion. ** &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Self-critique (if necessary): OK ------------------------------------------------ Self-critique Rating: 2 ********************************************* Question: `qGive 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. YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY Your solution: Velocity: A projectile goes horizontally and vertically. You end up with a right angle. The x side is the horizontal velocity. The y side shows the vertical velocity. The hypotenuse shows the magnitude of those velocity vectors. You can find the direction by finding the angle. Displacement: A projectile goes horizontally and vertically. You end up with a right angle. The x side is the horizontal displacment. The y side is the vertical displacement. The hypotenuse shows the magnitude of those displacement vectors. The angle tells the direction of the displacement. Force: Two forces are acting on an object. One is horizontal and the other is vertical. Sometimes they aren't, but you can rotate the grid to make it so. The horizontal force would be shown on the x axis. The vertical force would be shown on the y axis. By combining those vectors, you can find out the total force on the object and in what direction it moves. The hypotenuse gives you the total force and the angle gives you the direction. confidence rating #$&*: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Given Solution: `a 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. &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Self-critique (if necessary): I guess I wasn't specific enough with examples. ------------------------------------------------ Self-critique Rating: 2