|| A person is walking briskly in a straight line, which we shall call the x axis. Figure 2.42 shows a graph of the person’s position x along this axis as a function of time t. (a) What is the person’s displacement during each of the following time intervals: (i) between t = 1.0 s and t = 10.0 s, (ii) between t = 3.0 s and t = 10.0 s, (iii) between t = 2.0 s and t = 3.0 s, and (iv) between t = 2.0 s and t = 4.0 s? (b) What distance did the person move from (i) t = 0 s to t = 4.0 s, (ii) t = 2.0 s to t = 4.0 s, and (iii) t = 8.0 s to t = 10.0 s? Figure 2.42 Problem 2 2.2. Set Up: From the graph the position x t at each time t is: x 1 = 1.0 m, x 2 = 0, x 3 = −1.0 m, x 4 = 0, x 8 = 6.0 m, and x 0 = 6.0 m. Solve (a) The displacement is Δ x . (i) Δ x = x 10 − x 1 = +5.0 m; (ii) Δ x = x 10 − x 3 = +7.0 m; (iii) Δ x = x 3 − x 2 = −1.0 m; (iv) Δ x = x 4 − x 2 = 0 (b) (i) 3.0 m + 1.0 m = 4.0 m; 90° (ii) 1.0 m + 1.0 m = 2.0 m; (iii) zero (stays at x = 6.0 m)
|| A person is walking briskly in a straight line, which we shall call the x axis. Figure 2.42 shows a graph of the person’s position x along this axis as a function of time t. (a) What is the person’s displacement during each of the following time intervals: (i) between t = 1.0 s and t = 10.0 s, (ii) between t = 3.0 s and t = 10.0 s, (iii) between t = 2.0 s and t = 3.0 s, and (iv) between t = 2.0 s and t = 4.0 s? (b) What distance did the person move from (i) t = 0 s to t = 4.0 s, (ii) t = 2.0 s to t = 4.0 s, and (iii) t = 8.0 s to t = 10.0 s? Figure 2.42 Problem 2 2.2. Set Up: From the graph the position x t at each time t is: x 1 = 1.0 m, x 2 = 0, x 3 = −1.0 m, x 4 = 0, x 8 = 6.0 m, and x 0 = 6.0 m. Solve (a) The displacement is Δ x . (i) Δ x = x 10 − x 1 = +5.0 m; (ii) Δ x = x 10 − x 3 = +7.0 m; (iii) Δ x = x 3 − x 2 = −1.0 m; (iv) Δ x = x 4 − x 2 = 0 (b) (i) 3.0 m + 1.0 m = 4.0 m; 90° (ii) 1.0 m + 1.0 m = 2.0 m; (iii) zero (stays at x = 6.0 m)
|| A person is walking briskly in a straight line, which we shall call the x axis. Figure 2.42 shows a graph of the person’s position x along this axis as a function of time t. (a) What is the person’s displacement during each of the following time intervals: (i) between t = 1.0 s and t = 10.0 s, (ii) between t = 3.0 s and t = 10.0 s, (iii) between t = 2.0 s and t = 3.0 s, and (iv) between t = 2.0 s and t = 4.0 s? (b) What distance did the person move from (i) t = 0 s to t = 4.0 s, (ii) t = 2.0 s to t = 4.0 s, and (iii) t = 8.0 s to t = 10.0 s?
Figure 2.42
Problem 2
2.2. Set Up: From the graph the position xt at each time t is: x1 = 1.0 m, x2 = 0, x3 = −1.0 m, x4 = 0, x8 = 6.0 m, and x0 = 6.0 m.
Solve (a) The displacement is Δx. (i) Δx = x10 − x1 = +5.0 m; (ii) Δx = x10 − x3 = +7.0 m; (iii) Δx = x3 − x2 = −1.0 m; (iv) Δx = x4 − x2 = 0
(b) (i) 3.0 m + 1.0 m = 4.0 m; 90° (ii) 1.0 m + 1.0 m = 2.0 m; (iii) zero (stays at x = 6.0 m)
Imagine you are out for a stroll on a sunny day when you encounter a lake. Unpolarized light from the sun is reflected off the lake into your eyes. However, you notice when you put on your vertically polarized sunglasses, the light reflected off the lake no longer reaches your eyes. What is the angle between the unpolarized light and the surface of the water, in degrees, measured from the horizontal? You may assume the index of refraction of air is nair=1 and the index of refraction of water is nwater=1.33 . Round your answer to three significant figures. Just enter the number, nothing else.
Chapter 2 Solutions
College Physics Volume 1 (Chs. 1-16); Mastering Physics with Pearson eText -- ValuePack Access Card -- for College Physics (10th Edition)
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