13 A small mass attached to a string rotates on a frictionless able top as...

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13 A small mass attached to a string rotates on a frictionless able top as shown If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2 the kinetic energy of the mass COT will a decrease by a factor of 2 b remain constant c increase by a factor of 2 d increase by a factor of 4 n TANK A particle of mass m is thrown upwards from the surface of the earth with a velocity u The mass and the radius of the earth are respectively M and R lion due to gravity 11 paths of the two part a c 5 65 3 2 11 Two identical pianc have a fundament increase in the tens occurrence of 6 beat would be a 0 01 c 0 03 12 A thin prism of ar H 1 5 is combine index 1 75 I

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