An engineer is trying to determine the mass of a student who will barely touch the water when jumping off a bridge shown with an ideal bungee cord with a spring constant of 18N/m. The height of the bridge and natural length of the bungee cord are shown. Neglect drag, energy gained from the jump and loss due to impact with the water. 49m How much would the cord's length change in order to touch the water? m v List the energy types at the initial and final time and whether work and loss (due to non- 125m conservative forces) occur as well as the corresponding amounts of energy. initial: GPE unit work? no work v = unit v reference level loss? no loss unit final: EPE unit What mass student would barely touch the water? kg v Would a student with a mass of 31kg hit the water? no

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Chapter8: Potential Energy And Conservation Of Energy
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An engineer is trying to determine the mass of a student who will barely touch the
water when jumping off a bridge shown with an ideal bungee cord with a spring
constant of 18N/m. The height of the bridge and natural length of the bungee cord
are shown. Neglect drag, energy gained from the jump and loss due to impact with
the water.
49m
How much would the cord's length change in order to touch the water?
List the energy types at the initial and final time and whether work and loss (due to non-
125m
conservative forces) occur as well as the corresponding amounts of energy.
initial:
GPE
unit
work?
no work
unit
reference level
loss?
no loss
unit
final:
EPE
unit
What mass student would barely touch the water?
kg
Would a student with a mass of 31kg hit the water?
no
Transcribed Image Text:An engineer is trying to determine the mass of a student who will barely touch the water when jumping off a bridge shown with an ideal bungee cord with a spring constant of 18N/m. The height of the bridge and natural length of the bungee cord are shown. Neglect drag, energy gained from the jump and loss due to impact with the water. 49m How much would the cord's length change in order to touch the water? List the energy types at the initial and final time and whether work and loss (due to non- 125m conservative forces) occur as well as the corresponding amounts of energy. initial: GPE unit work? no work unit reference level loss? no loss unit final: EPE unit What mass student would barely touch the water? kg Would a student with a mass of 31kg hit the water? no
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