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**Unformatted text preview: **Assignment #3 Due: 11:00pm on Friday, July 5, 2013 You will receive no credit for items you complete after the assignment is due. Grading Policy A message from your instructor... Note: The problem numbers do not correspond to the end-of-chapter problems in the textbook (Knight). These problems are taken from a database provided by the publisher. Problem 3.3 A web page designer creates an animation in which a dot on a computer screen has a position of 3.60 2.10 5.10 . Part A Find the average velocity of the dot between and . Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4 . ANSWER: Correct Part B Find the instantaneous velocity at . Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4 . ANSWER: Correct Part C Find the instantaneous velocity at . Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4 . ANSWER: Correct r = [ cm +( cm/s 2 ) ] + ( t 2 i ^ cm/s ) tj ^ t = 0 t = 2.0s = 4.20,5.10 cm/s v ave t = 0 = 0,5.10 cm/s v t = 1.0s = 4.20,5.10 cm/s v Part D Find the instantaneous velocity at . Give your answer as a pair of components separated by a comma. For example, if you think the x component is 3 and the y component is 4, then you should enter 3,4 . ANSWER: Correct Problem 3.4 Part A If , where and are positive constants, when does the velocity vector make an angle of with the x- and y-axes? ANSWER: Correct Introduction to Projectile Motion Learning Goal: To understand the basic concepts of projectile motion. Projectile motion may seem rather complex at first. However, by breaking it down into components , you will find that it is really no different than the one-dimensional motions that you have already studied. One of the most often used techniques in physics is to divide two- and three-dimensional quantities into components. For instance, in projectile motion, a particle has some initial velocity . In general, this velocity can point in any direction on the xy plane and can have any magnitude. To make a problem more managable, it is common to break up such a quantity into its x component and its y component . Consider a particle with initial velocity that has magnitude 12.0 and is directed 60.0 above the negative x axis. Part A What is the x component of ? Express your answer in meters per second. t = 2.0s = 8.40,5.10 cm/s v = b + c r t 2 i ^ t 3 j ^ b c 45.0 t = 2 b 3 c v v x v y v m/s degrees v x v ANSWER: Correct Part B What is the y component of ?...

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