WHAT HAVE YOU LEARNECo I. What observational evidence is there that the mass has
ID: 1770841 • Letter: W
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WHAT HAVE YOU LEARNECo I. What observational evidence is there that the mass has gained gravitational potential cnergy when it is raised to the top position? energu Snce it comes toa stp. Due to gravitu tioaal evidence is there that the spring has gained elastic poteatial enery when it is stretched to the bottom position? ounces up aftn ee ed 3Hstlere any diserepancy between your vat and &PE.T; It so, how do you account for it? b. Is energy conserved in the interactions between the mass and the spring? Explaia .3359 m while observer B measures h as 0.336 m n thu noost exact 4. In this experiment observer A measures h2 as 0 How would you have recorded this measuremeat? Why? m) wouldn t vound unhilthe Stwch the top and bottom positions? b. Compute PEt and PE, at this halfway mark. c. Compare the sum ot PE, and PE, with the initial potential energy of the mass at the top position. d. How do you account for the difference? 6. a. During its fall, the loss in gravitational poteatial energy of the mass is converted into a combina- tion of elastic potential energy of the spring and kinetic eaergy of the spcing and mass. Where is PE greatest? Least? c. Where is KE greatest? Least? b. Where is PE, greatest? Least? 7. Eventually the oscillating spring comes to rest. What has happened to the energy imparted to the mass at the beginning of the experiment?Explanation / Answer
5 a) midpoint is (-0.34-0.70)/2 = -0.52m
b)PEg = mgh = - 4.9(0.52)= -2.548Joules
PEk= 1/2(k)(h^2) =0.1458 J
c) initial energy = PEg =mgh =-4.9(1.52) = 7.448 Joules. d)The difference is Kinetic Energy
6 a) PEg is greatest when height is maximum so at initial h0 and minimum at bottom.
b) PEk is max for maximum extension therefore at bottom and minimum for unstretched length at initial position
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