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EPChap02-Solution1

# EPChap02-Solution1 - Chap 2 HW part 1 Questions 2 Figure...

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1 Chap. 2 HW – part 1 Questions 2. Figure 2-15 is a graph of a particle’s position along an x axis versus time. (a) At time t = 0, what is the sign of the particle’s position? At t = 0, x is negative Is the particle’s velocity positive, negative, or 0 at: (b) t = l s, At t = 1s, v is positive ( v = d x /d t , at slope of curve which is positive) (c) t =2 s, At t = 2s, v is 0 (slope of x vs t is 0) (d) t = 3 s? At t = 3s, v is negative (slope of x vs t is -) (e) How many times does the particle go through the point x = 0? Two times (at t = 1 sec and t = 3 sec) 3. Figure 2-16 gives the velocity of a particle moving along an axis. Point 1 is at the highest point on the curve; point 4 is at the lowest point; and points 2 and 6 are at the same height. What is the direction of travel at (a) time t = 0 At t = 0, v is + so direction is along the positive axis (b) 4? At t = 4 s, v is - so direction is along the negative axis (c) At which of the six numbered points does the particle reverse its direction of travel? Particle reverses its direction when v changes sign, i.e. at t = 3 s and 5 s. (d) Rank the six points according to the magnitude of the acceleration, greatest first. Acceleration is equal to the slope of the v vs t curve: Largest for t = 2, 6, smaller for t = 3, 5 and zero for t = 1, 4 s. Problem 2. The 1992 world speed record for a bicycle (human powered vehicle) was set by Chris Huber. His time through the measured 200 m stretch was a sizzling 6.509 s, at which he commented, “Cogito ergo zoom!” (I think, therefore I go fast!). In 2001, Sam Whittingham beat Huber’s record by 19.0 km/h. What was Whittingham’s time through the 200 m?

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EPChap02-Solution1 - Chap 2 HW part 1 Questions 2 Figure...

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