2019WI-PHYS-1060H.hbrettpickering.Problem_Set_1.pdf

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Heather Brett-Pickering 2019WI-PHYS-1060H Assignment Problem Set 1 due 01/27/2019 at 11:59pm EST Material: Lecture notes for Weeks 1-3 Textbook: Sections 7.1, 7.2, 7.3, 8.1, 8.2, and Chapter 10 Course Notes, sections 1.1 - 2.8 Articles posted on Blackboard under Mechanics Primer and UNIT2: Elasticity and Scaling These questions should be done calculator free unless otherwise indicated. Depending on the week, you may not be permitted to use a calculator for your quiz! All answers should be given with the appropriate number of significant digits. 1. (1 point) A soccer ball is thrown straight up a distance of 5.0 m and returns to your hand. Neglecting air resistance, you know that: A. the speed was zero at the maximum height, but the velocity was never zero. B. the acceleration was constant throughout its motion. C. the acceleration was upward on the way up and downward on the way down. D. the velocity was constant except at the moment it turned around. E. the ball took longer to go up than come down. Answer(s) submitted: B (correct) 2. (1 point) The motions of two cheetahs, represented by P and Q, are described by the position-time graphs shown above. Do the two cheetahs ever have the same velocity? A. P and Q have the same velocity at 2 s. B. P and Q have the same velocity at 1 s, 2 s, and 3 s. C. P and Q have the same velocity at 3 s. D. P and Q have the same velocity at 1 s and 3 s. E. P and Q never have the same velocity. Answer(s) submitted: A (correct) 3. (1 point) Rank in order, from most positive to least positive, the accel- erations at points A to C on the graph above. Answer(s) submitted: C (correct)

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