hapter 16 HW #1 Begin Date: 1/5/2018 12:00:00 AM-Due Date: 1/31/2018 11:59:00 PM
ID: 1573213 • Letter: H
Question
hapter 16 HW #1 Begin Date: 1/5/2018 12:00:00 AM-Due Date: 1/31/2018 11:59:00 PM End Date: 19/2018 12:00:00 AM (6%) Problem 9: A mass is connected to a spring and is allowed to move horizontally. The mass is at a position L when the spring is unstretched. The mass is then moved, stretching the spring, and released from rest. It then moves with simple harmonic motion. ©theexpertta.com 33% Part (a) At the instant that the mass passes through the position where the spring is unstretched, what can be said about its instantaneous acceleration? OIt is maximumIt is non-zero but not maximum Grade Summary It is zero. Potential 100% Submit Hint I give up! Attempts remaining (0% per attempt) detailed view 3 Hints: 0% deduction per hint. Hints remaining: 4 Feedback: 0% deduction per feedback. 33% Part (b) At the instant that the mass passes through the position where the spring is unstretched, what can be said about its instantaneous speed? 33% Part (c) At the instant that the spring is compressed the most, what can be said about the magnitude of its instantaneous velocity?Explanation / Answer
(A) when spring is unstretched then net force is zero.
(F = k delta(L) = 0 )
and a = Fnet / m = 0
Ans: It is zero.
(B) at that point, sping potential energy = 0
so KE will be max at that point.
{ PE = k (delta(L))^2 / 2 }
so speed is maximum.
(C) when spring is compressed most at that point mass is stationary.
so velocity is zero.
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