PPYQ A particle of mass 10 g moves along a circle of radius 6.4 cm with a constant tangential acceleration. What is the magnitude of this acceleration, if the kinetic energy of the particle becomes equal to 8 x 10-4 J by the end of the second revolution after the beginning of the motion? 1. 0.15 m/s2 2. 0.18 m/s2 3. 0.2 m/s2 4. 0.1 m/s2 Ruhul Amin Alig
PPYQ The position of a particle with respect to time t along the x-axis is given by 9t2 – t3 where x is in metre and t in second. What will be the position of this particle when it achieves maximum speed along the +x direction? 1. 32 m 2. 54 m 3. 81 m 4. 24 m Ruhul Amin Alig
PPYQ A man throws some balls with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time? (Given g = 9.8 m/s2) 1. More than 19.6 m/s 2. At least 9.8 m/s 3. Any speed less than 19.6 m/s 4. Only with speed 19.6 m/s Ruhul Amin Alig
PPYQ If a ball is thrown vertically upwards with speed u, the distance covered during the last ‘t’ seconds of its ascent is: 1. ut 2. 1 2 gt 2 12gt2 3. ut − 1 2 gt 2 ut-12gt2 4. ( u + gt ) t (u+gt)t Ruhul Amin Alig
PPYQ A particle moves along a straight line OX. At a time t (in seconds), the displacement x (in metres) of the particle from O is given by x= 40 + 12t – t3. How long would the particle travel before coming to rest? 1. 24 m 2. 40 m 3. 56 m 4. 16 m Ruhul Amin Alig
PPYQ A particle moves so that its position vector is given by r = cosωt ˆ x + sinωt ˆ y , where ω is a constant. Which of the following is true? Ruhul Amin Alig
