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Unformatted text preview: PHYSICS + Solution --- Circular Motion Definition: Angular velocity, is rate of change of angular displacement. dt d = Equations: f 2 = Relationship between v, r, and a r v = v r r v a = = = 2 2 1. ANS: B For particle moving in a horizontal circle with constant angular velocity, the kinetic energy is constant (scalar) but linear momentum varies. (vector, p = m v ) 2. ANS: C The string becomes inclined to the vertical so that there will be a horizontal component of the tension to provide for the centripetal acceleration towards the centre. 3. ANS: C v v r centreof circular arc 4. ANS: E N mr T Tension 6 . 1 ) . 4 )( 5 . )( 20 . ( , 2 2 = = = 5. (i) the angular speed 1 . 2 . 6 12- = = = = s rad r v r v (ii) the force towards the centre. N r mv F 96 . 6 ) 12 )( . 4 ( 2 2 = = = 6. 4.0 m to centre of circle mg T (i) the tension in the string N T T N r mv T N mg T 116 ) 5 . 62 ( ) 1 . 98 ( ) cos (sin 5 . 62 . 4 ) . 5 ( 10 sin 1 . 98 ) 81 . 9...
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This note was uploaded on 09/07/2011 for the course RANDOM R 101 taught by Professor T.s. during the Fall '11 term at Research College.
- Fall '11