Answer is A) Fulcrum
The fixed point that a lever rotates around is called the fulcrum.
Answer:
1) 10.05 N/m
2) 20.69 m
Explanation:
1) If the jumper completes 8 cycles in 49 seconds, then the period of each cycles is T = 49/8 = 6.125 s
From this info we can calculate the spring constant, treating this as simple harmonic motion k:
2) Let g = 9.8 m/s2. So the jumper weight is F = mg = 60*9.8 = 588 N. With this force the jumper would have stretched the bungee a length of
x = F/k = 588 / 63.14 = 9.31 m
As the jumper is at rest 30m below the bridge and the cord is stretched by 9.31m. Then its original length would be 30 - 9.31 = 20.69 m
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