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: ->->->->->->->->->->->-> :
`dw = Favg * `ds
`dw = (0N + 3N)/2 * 2cm = .75N/cm
3 - .75 = 2.25 N
3 + .75 = 3.75 N
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: ->->->->->->->->->->->-> :
if it is 100% conservative the full amount would be elastic PE 3N.
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: ->->->->->->->->->->->-> :
.037 J = 1/2(.02kg)*(v^2)
v^2 = 3.7
v = 1.92 m/s
If instead the rubber band is used to 'shoot' the domino straight upward, then how high will it rise?
answer/question/discussion: ->->->->->->->->->->->-> :
.75N * `ds = 3.75 N/cm = 5cm
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20 mins
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