Oscillatory Motion. Solutions of Home Work Problems
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1 Chapter 15 Oscillatory Motion. s of Home Wor Problems 15.1 Problem (In the text boo) A 200-g bloc is attached to a horizontal spring and executes simple harmonic motion with a period of s. If the total energy of the system is 2.00 J, find (a) the force constant of the spring and (b) the amplitude of the motion. (a) he force constant can be calculated as follows: ω = m = 2π so, ( ) 2 ( ) 2 2π 2π = mω 2 = m = 0.200g = 126 N/m 0.250s (b) he amplitude of the oscillation A can be calculated from: so, A = E = 1 2 A2 2E = J 126N/m = m
2 2 CHAPER 15. OSCILLAORY MOION. SOLUIONS OF HOME WORK PROBLEMS 15.2 Problem (In the text boo) A seconds pendulum is one that moves through its equilibrium position once each second. (he period of the pendulum is precisely 2 s.) he length of a seconds pendulum is m at oyo, Japan and m at Cambridge, England. What is the ratio of the free-fall accelerations at these two locations? he period in oyo is: = 2π where L and G are the length of the oyo pendulum and the acceleration due to gravity in oyo. Similarly, in Cambridge we have: L C C = 2π Since the pendulums are a one second pendulums, then = C = 2 s. Squaring the above two equayions and divide them we get: L g or, or g L g = L C = L C L = = = g
3 15.3. PROBLEM (IN HE EX BOOK) Problem (In the text boo) A torsional pendulum is formed by taing a meter stic of mass 2.00 g, and attaching to its center a wire. With its upper end clamped, the vertical wire supports the stic as the stic turns in a horizontal plane. If the resulting period is 3.00 minutes, what is the torsion constant for the wire? he period of stics oscillation is given by: I = 2π κ where I is the moment of inertial of the stic around it s center. So, and the moment of inertial is: so κ = 4π2 I ml2 κ = 4π2 ml = 4π g (1.00 m) 2 12 (3 60 s) 2 = N m
4 4 CHAPER 15. OSCILLAORY MOION. SOLUIONS OF HOME WORK PROBLEMS 15.4 Problem (In the text boo) he front of her sleeper wet from teething, a baby rejoices in the day by crowing and bouncing up and down in her crib. Her mass is 12.5 g and the crib mattress can be modeled as a light spring with force constant 4.30 N/m. (a) he baby soon learns to bounce with maximum amplitude and minimum effort by bending her nees at what frequency? (b) She learns to use the mattress as a trampoline losing contact with it for part of each cycle when her amplitude exceeds what value? (a) o maximize the bouncing with minimum effort, the baby must achieve resonance condition, i.e she should bounce with the same frequency as the natural frequency of the mattress spring or she should bounce with, f = ω 2π = 1 2π m = N/m = 2.95 Hz 2π 12.5 g (b) he forces acting on the baby are her weight pushing down and the spring force. In one half cycle the two forces act downward and during the other half of the cycle the spring force acts upward and the weight acts downward. When the maximum spring force is equal and opposite to the weight the baby looses contact with the mattress. In other words she looses contact if the maximum acceleration of the spring equals the acceleration due to gravity, i.e. a max = Aω 2 = g or A = g ω 2 = g 2πf = 9.8 m/s 2 (2π 2.95 s 1 ) 2 = m
5 15.5. PROBLEM (IN HE EX BOOK) Problem (In the text boo) After a thrilling plunge, bungee-jumpers bounce freely on the bungee cord through many cycles. After the first few cycles, the cord does not go slac. Your little brother can mae a pest of himself by figuring out the mass of each person, using a proportion which you set up by solving this problem: An object of mass m is oscillating freely on a vertical spring with a period. An object of unnown mass m on the same spring oscillates with a period. Determine (a) the spring constant and (b) the unnown mass. (a) he angular frequency is: and the spring constant is: ω = m = 2π = mω 2 = 4π2 m 2 (b) he mass of the object attached to the spring is: Using from part (a) we get: m = 2 4π 2 m = 2 4π 2 = 4π2 m 2 ( 2 4π = m 2 ) 2
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