Exercise 3.3 K9 of Part A Corstants Find the avarage valacity of tha dot batwean
ID: 1877665 • Letter: E
Question
Exercise 3.3 K9 of Part A Corstants Find the avarage valacity of tha dot batwean t-0andt-2.0s. A wab page deaigner creates an animaton in which a dot on a computer screen has a poitian of F-[4.4 cn 2.3 cm/si(6.5 cm/s )tj aive your answer as pair of components separated by a comma. For e ampia, if you think the xeamponent is 3 and the y component is 4 then you should enter 3,4 Express your answer using two significant figures cm/s Submit Part B Find tha instantacous vaocity att-D Give your answer as a pair of components saparated by a comma. For example, if you think the r component is 3 and the y component is 4, then you should anter 3,4. Express your answer using two significant figures. cm/g Submit PartC Find the nstantancous voocity at t = 1.0 s Give your answer as a pair o components separated by a oomma. For example, if you think the xcomponent is 3 and the y component is 4, ten you should enter 3 4 Eress your answer using two significant figuras can/s Submit Part D Find the instarntaneous ve ocity att 2.0 s. your answer asa pair o components separated by a comma. For exampla, if you think the x eamponant is 3 and the y component is 4 then you should enter 3 4. Express yo answer using two significant figures. can/Explanation / Answer
r = [ 4.4 + 2.3 t^2 ]i + (6.5)t j
(A) average velocity = dispalcement / time
= (r(2) - r(0)) / (2 - 0)
r(2) = 13.6i + 13j and r(0) = 4.4i + 0j
v = ((13.6 - 4.4)i + (13 - 0)j ) / 2
v = 6.8i + 6.5j
Ans: 6.8 , 6.5
(B) v = dr/dt = 4.6t i + 6.5 j
at t = 0
v = 0i + 6.5j
Ans: 0, 6.5
(C) v at t = 1s
v = 4.6i + 6.5j
Ans: 4.6, 6.5
(D) at t = 2
v = 9.2 i+ 6.5j
Ans: 9.2, 6.5
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