A 3.0 kg rod of length 1.0m is suspended vertically from a frictionless pivot at

Question

A 3.0 kg rod of length 1.0m is suspended vertically from a frictionless pivot at its upper end. The moment of inertia of the rod pivoted about its upper end is 0.95 kg middot m2. A 0.2kg putty traveling horizontally with a speed 1.0 m/s strikes the rod at its center point and sticks there. The rod was at rest originaliy. What is the total angular momentum of the rod and the putty about the pivot point at immediately before or after the strike? (A) 0.2 kg middot m2/s (B)0.5 kg middot m2/s (C) 0-1 kg middot m2/s (D)1.0 kg middot m2/s (E)5.0 kg middot m2/s What is the total kinetic energy (of the rod and putty) immediately after (NOT BEFORE) the putty has sticked to the rod? (A)0.5 times 10-2J (B)0.1 times 10-2J (C) 5.0 J (D)0.2J (E) 0.35 J On a smooth horizontal surface, a 0.2kg box is attached to a spring of stiffness constant 20 N/m. At t=0, the box is stretched 0.10 m from the natural length of the spring and then released. What is the maximum kinetic energy of the box during the oscillation? (A) 20 J (B)0.2J (C)4.0J (D)2.0J (E) 0.1 J What is the period of the oscillation (in unit of seconds) ? (A) l.0 pi (B) 20 pi (C) 2.0 pi (D)0.2 pi (E) 0.3 pi

Explanation / Answer

1)bh3/thf

2)h202/naoh,h20

3)pcc

4)(ch3)2-ch-nh2,h3o+

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