PHY101 midsem paper 2017, Exams of Physics

Download PHY101 midsem paper 2017 and more Exams Physics in PDF only on Docsity!

Scanned by CamScanner

Scanned by CamScanner

Physics-101. Mid-semester examination Department of Physics Shiv Nadar University (SNU) Time: 90 Minutes Max. Marks: 25. 1) (i) Acarmoves ina circular path of radius R. It starts from the rest while the speed increases at a constant rate a. Determine the angle between its velocity and acceleration vectors at . 2.5] time ¢. [2.5 (ii) In the following figure (Fig .1), the hand is pulling the thread with acceleration a. Find the acceleration of Block using the constraint of inextensible rope and choosing proper coordinate system. [2.5] Fig. 1 (iii) A rubber ball of mass 0.2 kg falls to the floor. The ball hits with a speed of Bm/s and __ rebounds with approximately the same speed. High speed photographs show that the ball is in contact with the floor for At = 1073 s. What is the average force exerted on the ball by the floor? [2.5] @v) A ball of mass m is released from a point inside a frictionless bow! of radius R. When the ball makes an angle with respect to vertical say 8, as shown in Fig. 2 , during its periodic motion, Draw free body diagram and write equation of motion in the given quantities using polar coordinate system. [2.5] Fig.2 2 A disk rotates with constant angular velocity @, as shown in Fig. 3. Two masses, my and mg, Slide without friction in a groove passing through the center of the disk. They are connected by a light string of length /. and are initially held in position by a catch, with Mass mz, at distance r4 from the center. Neglect gravity. At / = 0 the catch is removed and the masses are free to slide. (i) Draw free body diagram of each mass from the point of view of an observer on the ground, (Note, show only the forces in the free body diagram. Do not write the . acceleration generated by these forces in the same diagram.) 0] (ii) Write Newton’s equation for each particle in polar coordinate system taking center of the circle as origin for the observer from the ground. Physics 101 Mid-semester examination Page 1 Scanned by CamScanner