Class: Date: ID: A SICS 235 TKKEHOME EXAM #2 FALL 2022. SHOW ALL WORK IN THE SPACE VIDED ple Choice y the letter of the choice that best completes the statement or answers the question. 1. How long would it take a car starting from rest and accelerating uniformly in a straight line at 5m/s2 to cover a distance of 200 m? a. 9.0 s d. 15.5 s b . 10.5 s e . 20.0 s c. 12.0s 2. If a = 40, B= 60, and M= 4.0 kg, determine the tension in string 1. 2 M a. 15 N d. 22 N b. 20 N e . 36 N C . 17 N 3. The initial path of a rocket is 30 above the horizontal and the horizontal component of the rocket's velocity is 326 m/s. The initial vertical component of the of the rocket's velocity is d. 190 m/s a. 280 m/s 330 m/s e . .250 m/s b. 380 m/s Tories yes and juneTAKE HOME EXAM #2 FALL 2022. ID: A 4. A mass m, is travelling at an initial speed V1 = 25.0 m/s. It is brought to rest in a distance of 62.5 m when a force of 15.0 N acts on it. The mass m is: a. 37.5 kg d. 6.0 kg b. 3.0 kg e. 3.75 kg c. 1.50 kg 5. For a Vector A, the x- component Ax = -10m and the y- component Ay =+6m. The vector A is making an angle 0 with the positive x axis in a counter clockwise direction, where 0 and the resultant are: a. 310, 12 m d. 2110, -12 m b. 590, 12 m e. 2390, 12 m c. 1490, 12 m 6. An object accelerates uniformly from rest at 35 m/s?. If it moves 60 m during this period, its velocity is: a. 2100 m/s d. 64.8 m/s b. 1.17 m/s e. none of the above C. 4200 m/s 7. A force of 40 N is needed to set a 10 kg box moving across a wooden floor. The coefficient of static friction is : d. 2.5 a. 0.08 b. 0.25 e. none of the above C. 0.4 2ID: A 8. For a Vector A, the x- component Ax = 10m and the y- component Ay =+6m. The vector A is making an angle 0 with the positive x axis in a counter clockwise direction, where 0 is: a. 31 b. 59 d. 211 . 149 e . 239 9. A block of mass 3.5 kg slides down a frictionless incline plane of lenght of 6.4 m that makes an angle of 30 with the horizontal . If the block is released from rest at the top of the incline, what is the speed at the bottom? a. 5.0 m/s d. 8.0 m/s b. 5.7 m/s e. 10.0 m/s c. 6.4 m/s 10. A 4.0 kg object with a velocity0.0350 m/s to the right, and collides with a larger 6.0 kg mass initially at rest. After collision, the smaller object moves with a velocity of 0.0070 m/s. a. What is the larger object's velocity after collision? b. What is the total kinetic energy of the system after collision? a. 1.17 x 10-2 m/s, 1.245 x 10 J d. 3.97 x 10-2 m/s, 4.9 x 10"J b. '2.74 x 10-2 m/s, 4.70 x 10 J e. 1.867 x 10' m/s, 1.14 x 10 J c. 2.80 x 10-2 m/s, 1.22 x 10 "J 11. The earth has a mass 5.89 x 1024 kg and the moon has 7.36 x 1022 kg and 3.84 x 10' km from the earth. How far from the center of the earth is the center of mass of the earth-moon system? 3.8 x 10' km d. 2.1 x 10' km a. b. 7.4 x 10' km e. 4.7 x 10' km c. 1.9 x 10' km WICS 235 TAKE HOME EXAM #2 FALL 2022. ID: A 2. Exhibit 3-1 The three forces shown act on a particle. 65.0 N 30 30.0 N - 20 20.0 N Use this exhibit to answer the following question(s). Refer to Exhibit 3-1. What is the magnitude of the resultant of these three forces? a. 27.0 N d. 33.2 N b. 23.8 N e. 105 N C. 36.3 N 13. The horizontal surface on which the block slides is frictionless. If F = 20 N and M= 5.0 kg, what is the magnitude of the resulting acceleration of the block? F F M d. 4.7 m/s2 a. 5.3 m/s2 6.2 m/s2 e. 7.5 m/s2 c. 3.2 m/s2 4HYSICS 235 TAKE HOME EXAM #2 FALL 2022. me: 14. ID: A are frictionless. If F = 40 N and M= 2.0 kg, what is the magnitude of the acceleration of the suspended object? All surfaces F 2M M a. 1.2 m/$2 b. 2.0 m/s2 d. 2.5 m/$2 C. 1.5 m/s2 e. 5.6 m/$2 15. If M=2.0 kg, what is the tension in string 1? 30' 2 M a. 1.2 N d. 3.5 N b. 1IN e. 40 N 34 N 16. A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block? 0.51 kJ d. 0.13 kJ a. 20 KJ b. 0.29 kJ C. 0.80 KJ 5PHYSICS 235 TAKE HOME EXAM #2 FALL 2022. Name: ID: A 20. A 4.0-kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall. The particle rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to the particle? a. 24 N-S b. 32 N.S d. 30 N.S C. e . 8.0 N.S 40 N.S 21. A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision? a. 2.4 J d. 0.6 J b. 9.6J e . 6.0 J C. 5.4 J 22. Two forces act on 3.0-kg mass. One of the forces is 9.0 N East, an the other is 8.0 N in the direction of 620 North of West. What is the magnitue of the acceleration of the mass? a. 5.7 m/s2 d. 2.4 m/s2 b. 2.0 m/s2 e . 2.9 m/s2 . 3.3 m/s2PHYSICS 235 TAKE HOME EXAM #2 FALL 2022. ID: A Name: 17. A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M? a. 7.5 kg d. 4.2 kg b. 5.0 kg e . 8.0 kg C. 6.0 kg 18. A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 1.5 m. The maximum angle the string makes with the vertical as the pendulum swings is 30. What is the speed of the object at the lowest point in its trajectory? a. 2.5 m/s d. 2.7 m/s b . 2.2 m/s e . 3.1 m/s 2.0 m/s 19. An object of unknown weight is suspended as shown. The tension in rope 1 is 25N, and the tension in rope 2 is 31N. What is the weight of the suspended object? 2 M a. 36 N d. 56 N b . 33 N e. 39 N C. 41 NPHYSICS 235 TAKE HOME EXAM #2 FALL 2022. ID: A Name: Problem 23. SHOW ALL WORK TO RECEIVE FULL CREDIT. A 2 kg ball moving East with a velocity of 3 m/s collides with another ball of mass 1 kg moving West with a velocity of 4 m/s. If the collision is an elastic collision, find the change in kinetic energy of the 1 kg ball due to this collision. 24. A 30 kg block is pushed by a force 100 N at an angle of 40. If the block is accelerating at 2.5 m/s find the coefficient of kinetic friction between the block and the surface. 25. A steel coil spring 1.2m long is stretched to a total length of 1.8m long by a load of 30kg. What would be its length if stretched by a 7.5kg mass? 26. A 0.50 kg ball moving to the right with a speed of 5. m/s moves a head on collision with a 1.5 kg ball moving to the left with a speed of 2 m/s. If the collision is elastic; find the velocity of each ball after collision and the kinetic energy of each ball