Mastering Physics Assignment #3

Mastering Physics Assignment #3 - Assignment#3 Due 11:00pm...

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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
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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
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ANSWER: Correct Part B What is the y component of ? Express your answer in meters per second. ANSWER: Correct Breaking up the velocities into components is particularly useful when the components do not affect each other. Eventually, you will learn about situations in which the components of velocity do affect one another, but for now you will only be looking at problems where they do not. So, if there is acceleration in the x direction but not in the y direction, then the x component of
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