(a) For each case, determine whether ? change is positive, negative or zero. Plo
ID: 3899914 • Letter: #
Question
(a) For each case, determine whether ?change is positive, negative or zero.Plot 1 1---Select---positivenegativezero
Plot 2 2---Select---positivenegativezero ??
Plot 3 3---Select---positivenegativezero ??
(b) For each case, determine whether ? is zero before, after or at t = 0.
Plot 1 4---Select---beforeafterat t = 0
Plot 2 5---Select---beforeafterat t = 0 ??
Plot 3 6---Select---beforeafterat t = 0 ??
(c) For each case, determine whether ? is positive, negative, or zero.
Plot 1 7---Select---positivenegativezero ??
Plot 2 8---Select---positivenegativezero ??
Plot 3 9---Select---positivenegativezero ??
Explanation / Answer
a) (1) positive since (1) finishes at 90 and started around 70
(2) zero since initial and final theta are both -90 deg
(3) negative since it started at 90 and finished around 40 deg
b) (1) this must be asking for omega (Greek letter doesn't show in the question)
omega goes to zero at t = -2
(2) omega is zero at t = 0 since theta is not changing at t = 0
(3) after omega = zero at t = 2.5 sec
c) here I am guessing that the question is asking for alpha the angular acceleration
(1) positive since omega is going from a decreasing to an increasing value
(2) positive also since omega is initially decreasing and then increases
(in other words the change in angular speed (slope) goes from negative to positive
(3) negative since omega is initially positive and then turns negative
(or the slope is going from a positive value to a negative value)
It's important to notice that the slope gives the instaneous angular speed!!
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