2nd. il session maste Mastering Physics: HW 3A A Boy 12.0 Above The Physics 111

Question

2nd.


il session maste Mastering Physics: HW 3A A Boy 12.0 Above The Physics 111 during Spring 2017 Item 3 Part A Find the average velocity of the dot between t 0 and t 2.0 s. A web page designer creates an animation in which a dot on a computer screen has a position of Give your answer as a pair of components separated by a comma. For example, if you r 4.2 cm 3.0 cm/s )tali (55 cm/s)t think the x component is 3 and the y component is 4, then you should enter 3,4. Express your answer using two significant figures. 6i +5 j cm/s Submit My Answers Give Up incorrect: Try Again: 5 attempts remaining, no points deducted Your answer does not have the correct number of oomma-separated terms, Part B Find the instantaneous velocity at t 0. 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. Express your answer using two significant figures. cm/s Submit My Answers Give Up

Explanation / Answer

r = (4.2+3t^2)i+5.5 t j

at t = 0

r1 = 4.2i

at t = 2 s

r2 = (4.2+12)i+11j = 16.2i+11j

v avg = r2-r1/t2-t1 = 12i+11i/2 = 6i+5.5j cm/s

b) v = dr/dt = 6ti+5.5j

at t = 0

v = 5.5 j cm/s

c) at t = 1 s

v = 6i+5.5j cm/s

d) at t = 2s

v = 12i+5.5 j cm/s

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