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GOLIGHTLY.F00.MT2.1 - below The mombnt of inertia of the...

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Midterm Exam #2 Physics 8A, Fall 2000 (Section 1) Each problem is wonh l0 points total. I . A 2.0 kg mass moving at 1.5 rnls strikes a stationary object of mass 5.0 kg which is anached to a spring of spring constant k = 8.0 N/m. If after the collision the 2.0 kg mass rebounds in the opposite direction at 0.5 n/s, what is the maximum compression distance of the spring? g'. a,f 4t 4- a *{r- 2. A dumbell consists of two identical uniforrn solid disks, with a combined mass of 3.0 kg, and a bar of negligible mass connecting the two of them through theircenters. One end of a rope is attached to the bar of the dumbell, and the other end is attached to a 2.0 kg mass, with the rope running over a pulley in between,
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Unformatted text preview: below. The mombnt of inertia of the pulley is negligible. The rope exerts a force on the bar exactly at the axis of rotation of the dumbell. As the mass falls, the dumbell rolls without slipping. What is the acceleration of the system? 1 . 5 l , ) d--1. t I m z / . o k 1 3. A planet revolves around a star in an elliptical orbit. At its point of closest approach to the star, it is a distance of 1.0 x l0^l l m from the star and is travelng at a speed of 2.0 x 10"4 m/s. At its-point of furthest distance from the star, it is traveling at 1.2 x l0^4 m/s. (a) How far must it be from the star at that time? (b) What is the eccentricity of the orbit? 6. t'-. tl't -,3,o t<7 . l - - 6 . ,...
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