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SO luy) ons B PHY103 FINAL EXAMINATION 17.01.2024, Time: 80 minutes, Name: last name: Student number: Q Q @ 3 OF Department: LA 4, 5,6 7,8, 6, 7,8 7859 Grade Instructions: Write your name and student number clear and readable. This examination has four problems. Write your solutions orderly in the space provided for that problem: Do not use calculators. Do not leave th exam room during the first 30 minutes and during the last 5 minutes. - . 1. A block, M = 2.5 kg is pulled a distance, d= 2 m on a rough horizontal surface by a constant force, F = 30 Nacting at an angle of 37° as shown in the figure. A constant friction force, f= 9 N acts on the block. (a) Find the total work done on the block. (b) What is the change in the kinetic energy of the block during this motion? How much energy lost during this motion? (c) If the block stats from rest what is its kinetic energy at the end of the 2 m displacement? (Assume,’g = 10 m/s”, sin37° = cos53° = 0.6, sin53° = cos37° = 0.8). ME ay Ue odio) $4 Oa) = Boy heme fy ae = 208) =) ee 2- An elastic spring of force constant, k = 4x10° N/m is compressed by, x = 2x10? m. A block at the end of the compressed spring is released from rest, see the figure. (a) Find the force to compress the spring by, x = 2x10 m. (b)Find the kinetic energy of the block as it passes through the equilibrium position if the surface is frictionless, (c) Find the kinetic energy of the block as it passes through the equilibrium position if there is a constant friction force, f= 30 N acting on the block. i) Fokx ip PB) Qaim) = %ON Ea oe hy Labbe =tgucd CH) = OS . Qe ‘ a = 0 Pe : wa Foal onic +e ot = soe =| = aay i 08-0 v=o. oy 
