PHY201
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A rubber band begins exerting a tension force when its length is 8 cm. As it is stretched to a length of 10 cm its tension increases with length, more or less steadily, until at the 10 cm length the tension is 3 Newtons.
• Between the 8 cm and 10 cm length, what are the minimum and maximum tensions?
answer/question/discussion:
min = 0N
max = 3N
• Assuming that the tension in the rubber band is 100% conservative (which is not actually the case) what is its elastic potential energy at the 10 cm length?
answer/question/discussion:
W=PE=3N*2cm=6Ncm
• If all this potential energy is transferred to the kinetic energy of an initially stationary 20 gram domino, what will be the velocity of the domino?
answer/question/discussion:
V=sqrt(KE*1/2*m)=24.5cm/s
This isn't correct; see note on preceding submission.
• If instead the rubber band is used to 'shoot' the domino straight upward, then how high will it rise?
answer/question/discussion:
y=(v^2-v0^2)/2a=(24.5^2-0)/2*9.8= 30.6cm
Very good work on this step, except that the units don't work and the 24.5 cm/s isn't correct.
However note that if you use velocity in cm/s, the acceleration should be in cm/s^2 so the units will work out.
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1 hour
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