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Physic: A bungie jumber jumps from a height of 50 m. His bungie cord brings him to a stop 15m above ground....
1. A bungie jumber jumps from a height of 50 m. His bungie cord brings him to a stop 15m above ground. His mass is 60kg. The cord, when not stretched, has a length of 15m.
a)What is his gravitational potential energy at the start of his jump?
b)What is his gravitational potential energy as he reaches the bottom of his jump?
c)What must the elastic potential energy at bottom of the jump be?
d)How much is the cord stretched by? (assume it is tied to a point 50 m above the ground)
e)What is the spring constant of the cord?
2. Which has a bigger spring constant, a spider web or a guitar string?
I am so confused????!!!!
a) w/r/t the ground
m*g*h=60*9.81*50
29430 J
b)
60*9.81*15
8829
c) The difference of a and b
20601 J
d)
50-30=20 m
e)
.5*k*20^2=20601
solve for k
103 N/m
j
As to the second, I would say the spider web
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