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A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip ? - physics 20130 AnswerAn annular disc has a mass m, inner radius R and outer radius 2R. The disc rolls on a flat surface without slipping. If the velocity of the centre of mass is v, the kinetic energy of the disc is: (-Gate mechanical 2014)1 AnswerConsider a disc rotating in the horizontal plane with a constant angular speed about its centre O. The disc has a shaded region on one side of the diameter and an unshaded region on the other side a shown in the figure. When the disc is in the orientation as shown, two pebbles P and Q are simultaneously projected at an angle towards R. The velocity of projection is in the y-z plane and is same for both pebbles with respect to the disc. Assume that (i) they land back on the disc before the disc has completed 1/8 rotation, (ii) their range is less than half the disc radius, and (iii) remains constant throughout. Then - jee main 2012 physics 1 AnswerThe kinetic energy of an object of mass, m moving with a velocity of 5 ms-1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times? - Physics Cbse class 11 1 AnswerThe pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows: GATE-Instrumentation-Engineering-20141 AnswerA ball of mass (m) 0.5 kg is attached to the end of a string having length (L) 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in radian/s) is - jee main 2012 physics 1 AnswerA mass m1 of 100 kg travelling with a uniform velocity of 5 m/s along a line collides with a stationary mass m2 of 1000 kg. After the collision, both the masses travel together with the same velocity. The coefficient of restitution is:1 AnswerAn object of mass 100 kg is accelerated uniformly from a velocity of 5 ms-1 to 8 ms-1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object. - Physics Cbse class 11 0 AnswerTwo objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s-1 before the collision during which they stick together. What will be the velocity of the combined object after collision? - Physics Cbse class 11 1 AnswerVelocity of an object fired directly in upward direction is given by ܸV = 80 − 32 t , where t (time) is in seconds. When will the velocity be between 32 m/sec and 64 m/sec? GATE- Agricultural Engineering- 20131 AnswerA thin cylinder of inner radius 500mm and thickness 10mm is subjected to an internal pressure of 5MPa. -gate-mechanical-20111 AnswerFor the four-bar linkage shown in the figure, the angular velocity of link AB is 1 rad/s. the length of link CD is 1.5 times the length of link AB. -gate-mechanical-20111 AnswerDefine the terms elastic and inelastic collisions Physics Cbse class 11 1 AnswerAn object of mass 1 kg travelling in a straight line with a velocity of 10 ms-1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object. - Physics Cbse class 11 1 AnswerDefine and state the difference between Phase velocity and group velocity. engineering physics1 AnswerGive the Relation between phase velocity and group velocity.-engineering physics1 AnswerGive the relation between group velocity and particle velocity.engineering physics1 Answer A projectile is fired at an angle θo with intial velocity vo. Show that its trajectory is parabolic -Physics Cbse class 11 0 AnswerCertain force acting on a 20 kg mass changes its velocity from 5 m/s to 2 m/ s. Calculate the work done by the force. - Physics Cbse class 11 1 AnswerThe term ‘Working head’ in context of water supply system means, GATE- Architecture and Planning- 2013 1 Answer