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Question: Your directions on a scavenger hunt map say to walk 33 m east, then 41 m south, then 29 m northwest. The positive x direction is the direction to the east and the positive y direction is the direction to the north. Part A What is your displacement in polar coordinates?
Calculating the displacement in polar coordinates requires us to first find the cartesian (x, y) coordinates and then convert them to polar coordinates. Our movements in x (east-west) direction are: 33 m east (which we'll mark as positive) and 29 m northwest (which has a west component). The westward component of a northwest movement can be calculated using trigonometry, as northwest could be represented as a 45 degrees angle with both north and west. The westward movement is 29 m * cos(45), which is about 20.51 m west (we'll mark as negative). Our movements in y (north-south) direction are: 41 m south (which we'll mark as negative) and 29 m northwest (which has a northern component). The northward component is 29 m * cos(45), which is about 20.51 m north (we'll mark as positive). Calculating net displacements: Net displacement in x direction = 33 m east - 20.51 m west = 12.49 m Net displacement in y direction = 20.51 m north - 41 m south = -20.49 m To represent these in polar coordinates, we find the magnitude (r) and the direction (θ) of the displacement. The magnitude can be found using the Pythagorean theorem a² + b² = c²: r = sqrt((12.49 m)² + (-20.49 m)²) = sqrt(156.2401 + 419.8401) = sqrt(576.0802) = 24 m (rounded) The direction can be found using the arctan function: θ = arctan((-20.49 m) / (12.49 m)) = -59 degrees In the context of polar coordinates, the negative sign indicates a direction 59 degrees below the x-axis, or to the southeast. So your displacement in polar coordinates is about 24 m to the southeast.
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