Review for Exam 2. Exam Informa+on 11/24/14 Monday 7:30 PM All Sec+ons à MPHY 205 (this room, 30 min a.er class ends) Dura+on à 1 hour 15 min
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1 Review for Exam 2 Exam Informa+on 11/24/14 Monday 7:30 PM All Sec+ons à MPHY 205 (this room, 30 min a.er class ends) Dura+on à 1 hour 15 min Ø Know your instructor s name (S+egler) and your sec+on number ( ) Ø Have your TAMU ID ready to show when turning in your exam. Ø Calculators are allowed, no pre- saved data on them, if you are caught using previously saved data it will be considered chea=ng and dealt with accordingly. Exam Structure Ø 4 mul+ple choice ques+on You do not need to show your work on these. There is no par+al credit. Ø 3 long problems The problems will be similar to homework problems of medium difficulty. There will be a mix of numeric and symbolic problems. Par+al credit is given, you must show your work clearly.
2 Problem 3* A 15.0 kg block is a[ached to a very light horizontal spring (k = 500 N/m) and is res+ng on a fric+onless horizontal table. Suddenly it is struck by a 3.00 kg stone traveling horizontally at 8.00 m/s to the right, whereupon the stone rebounds at 2.00 m/s horizontally to the le]. Find the maximum distance that the block will compress the spring a]er the collision.
3 Problem 4* A 5.00 kg ornament is hanging by a 1.50 m wire when it is suddenly hit by a 3.00 kg missile traveling horizontally at 12.0 m/s. The missile embeds itself in the ornament during the collision. What is the tension in the wire immediately a]er the collision?
4 Problem 5* A woman whose mass is 70.0 kg stands at the rim of a horizontal turntable that has a moment of iner+a 300 kg m 2 and radius of 2.00 m. The system is ini+ally at rest and is free to rotate about fric+onless ver+cal axle through the center of the turntable. The woman begins to walk clockwise around the rim at a speed 1.50 m/s rela+ve to the earth. a) In what direc+on and with what angular speed does the turntable rotate? b) How much work does the woman do to set the system (woman plus turntable) in mo+on?
5 Problem 6* Two blocks are suspended over a pulley with a string of negligible mass as shown below. One block has mass m 1 = 1.00 kg, the other one has a mass of m 2 = 2.00 kg. The pulley is a uniform solid cylinder. The string does not slip on the pulley and the center of mass of the pulley remains sta+onary. The downward accelera+on a, of mass m 2 is measured to be a = g/4. a) What is the mass, M, of the pulley? b) If you replaced the pulley by a hollow cylinder of the same mass and radius, the downward accelera+on of mass m 2 would be. a m 1 m 2
6 Problem 6* - cont. b) If you replaced the pulley by a hollow cylinder of the same mass and radius, the downward accelera+on of mass m 2 would be. a m 1 m 2
7 Problem 8* You have a horizontal table with a fric+onless top and a hole in the center. A string through this hole is suppor+ng a hanging mass m 1 = 0.35kg. The end on the top of the table is a[ached to a mass m 2 = 0.16kg. The length of string from the hole to m 2 is 0.25m and the mass on top is rota+ng around the hole at the proper speed for the system to be in equilibrium. What is its linear speed? Angular speed?
8 Problem 9* A dumbbell consists of two balls, one of mass M and the other of mass 2M, connected by a light rod of length L. The dumbbell is mounted ver+cally on a pivot with the heavier ball at the bo[om. The pivot is located at the midpoint of the rod. The system, which is ini+ally at rest, is free to rotate about the pivot. A wad of pu[y of mass M and ini+al velocity V collides with and s+cks to the lower mass, as shown in the diagram. In terms of the quan++es given, what is the minimum value of V for which the dumbbell will make it all the way around. pivot X L V
9 Problem 9* - cont. pivot X L V
10 Problem 11* A cylinder of mass M and radius R is in sta+c equilibrium as shown in the diagram. The cylinder rests on an inclined plane making an angle θ with the horizontal and is held by a horizontal string a[ached to the top of the cylinder and to the inclined plane. There is fric+on between the cylinder and the plane. What is the tension in the string T? T M R!
11 Vote for the problem you want me to work out A) Problem 1 cars colliding (conservamon of momentum) B) Problem 2 moving center of mass and two parmcles (CoM) C) Problem 7 two disks (conservamon of angular momentum) D) Problem 10 pencil leaning on a wall (stamc equilibrium) E) Problem 12 - bar with cables and an extra weight (stamc equilibrium)
12 Problem 1 Two cars collide at an intersec+on. Car A, of mass 2000 kg, is moving from west to east, while car B of mass 1500 kg, is going from north to south at 15.0 m/s. As a result of this collision, the two cars become enmeshed and move as one a]erword. A]er the collision, the enmeshed cars moved at an angle of 65 south of east from the point of impact. a) How fast were the enmeshed cars moving just a]er the collision? b) How fast was car A going just before the collision? a) v f = 7.09 m/s b) v Ai = 5.24 m/s
13 Problem 2 A system consists of two par+cles. At t = 0 one par+cle is at the origin; the other with a mass of 0.50 kg is on the y- axis at y = 6.0m. At t = 0 the center of mass is located at y = 2.4m.! The velocity of the center of mass of the system is given by v CM = (0.75 m )t 2 î s 3 a) Find the total mass of the system. b) Find the accelera+on of the center of mass at any +me t. c) Find the net external force ac+ng on the system at t = 3.0s
14 Problem 7 Two disks are mounted on fric+onless bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, which has a mass of 1.00 kg and radius of 2.00 m, is set spinning at 45.0 rad/s. The second disk, which has a mass of 2.00 kg and a radius of 3.00 m, is set spinning at 25.0 rad/s in the opposite direc+on. They then couple together. What is their angular speed a]er coupling? ω f = rad/s
15 Problem 10 A picture below shows a pencil with its sharpened end res+ng against a smooth ver+cal surface and its erase end res+ng on the floor. The center of mass of the pencil is 9.00 cm from the end of the eraser and 11.0 cm from the +p of the lead. The coefficient of sta+c fric+on between the eraser and floor is m = What is the minimum angle θ the pencil can make with the floor such that it does not slip? tan! =! = 29.4! 9cm.8(20cm)
16 Problem 12 A 350N, uniform, 1.50m bar is suspended horizontally by two ver+cal cables at each end. Cable A can support a maximum tension of 500.0N without breaking. Cable B can support up to 400.0N without breaking. You want to place a small weight on this bar. a) What is the heaviest weight you can put on the bar without breaking either cable? b) Where should you put this weight? a) ω max = 550N b) L =.614m from T A
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