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# IIT JEE Exam 2024 : physics

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Class DPP : 03 CIRCULAR MOTION 1. A particle is moving on a circular path. The angle turned by radius vector is = 0(1 e t/3), where is in radian and t is in second. The angular acceleration at t = 0 is 1) 1 rad/s2 3 3) 10 rad/s2 2) 1 rad/s2 9 1 4) rad/s2 6 2. A point P moves in a co unt er -cl ock wi se direction on a circular path as shown in the figure. The movement of P is such that it sweeps out a length s = t3 + 5, where s is in metre and t is in second. The radius of the path is 20 m. The acceleration of P when, t = 2 s is nearly, is 1) 13 ms 2 2) 12 ms 2 3) 7.2 ms 2 4) 14 ms 2 3. A particle P starts from rest with constant angular acceleration in anti-clockwise direction from point P on a circular path of radius R. The acceleration of the particle at t = RCC / is 1) R i R j 2) R k R j 3) R i R j 4) None of these RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** RCC** SINGLE CORRECT ANSWER TYPE 4. For a particle in a uniform circular motion, the acceleration a at a point P (R, on the circle of radius R is (here, is measured from the X-axis) 1) v2 v2 cos i sin j R R 2) v2 v2 sin i cos j R R 3) v2 v2 cos i sin j R R 4) v2 v2 i j R R 5. A small block of mass 10 g is fastened to one end of a light string and a second block m2 of mass 20 g to the middle point, the other end of the string fastened to a fixed point on a smooth horizontal table. The blocks are then projected such that the two portions of the string are always in the same straight line and the blocks describe horizontal circles on the table as shown in the figure below. The tension in string portion between blocks is T1 and tension between point O and the block T1 of mass m2 is T2. The value of T is 2 1) 1 3) 0.5 2) 2 4) 0.25 1

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