Question

If a plot is made for a dropped object's speed versus time, near t=0 the slope will be

		dependent on the object's shape
		dependent on the object's mass
		equal to g
		both a and b

If you plot a dropped object's speed versus time, at large values of t the plot will

		continue to rise
		reach an asymptote
		have a slope of g
		decrease steadily to zero

At a molecular level, the bond between atoms

		stretches like a spring.
		is very rigid.
		obeys a quadratic restoring force
		is fragile

In the Simple Harmonic Motion section of the text, the motion of a mass-spring system is written as a linear combination of sine and cosine terms. In what case(s) can one of the terms be eliminated? Choose the best answer.

		When initial velocity is zero.
		When initial displacement is zero.
		When the damping force is zero.
		Both a and b.

Answer 1

011- Object un Object under free fall will always experience a down ward acceleration) at any time. and slope of velocity versus time is accelerat so, (C) equal tog 02:- As earlier As earlier we have discussed in problem II slop at any time at twill be go so, (e) have a slope of g Q3;- bond between atoms at molecules le is very neanto rigid for most of the ma so, ®) is very rigid most of the materials 04. x= A sinut + B costat when go at t=0 Bao SO, X= A sincet - Aw cosult - BW sinut when ž=0 at t=0 A=0 e-Businuet so, hence Both (9) and (b) are correct