I to solve a problem with bunjee jumping

  • Thread starter Thread starter trunks21
  • Start date Start date
AI Thread Summary
The discussion revolves around calculating the length and spring constant (K) for a bungee jump of 150 feet while ensuring the jumper avoids a 15-foot obstacle below the jump point. Participants emphasize the need to apply conservation of energy principles but struggle with how to account for the rebound height without hitting the obstacle. The challenge lies in determining the bungee cord's specifications, including its energy absorption characteristics. It is noted that if energy is conserved, the jumper would return to the original height, complicating the scenario. Additional information about the bungee cord is necessary for accurate calculations.
trunks21
Messages
2
Reaction score
0
I need help to solve a problem with bunjee jumping!

I need to find the lengh and the K (spring constant) for a jump of 150ft. when they rebound they must avoid an obstacle that extends 15ft below the point at which they jump.

please help!
 
Physics news on Phys.org
trunks21 said:
I need to find the lengh and the K (spring constant) for a jump of 150ft. when they rebound they must avoid an obstacle that extends 15ft below the point at which they jump.

please help!
What have you done to try to solve the problem? What additional information do you have about the bungee cord?
 
We start to solve with the conservatiion of energy

1/2ks^2 + 1/2mV^2 + mgh = 1/2ks^2 + 1/2mV^2 + mgh

but with that we only have when the mass not hit the ground, the hard part is how with the same information the mass when rebound not hit the 15ft obstacle bellow the start point?

the information of the cord is what we need to find using different long cord and different mass...
 
trunks21 said:
We start to solve with the conservatiion of energy

1/2ks^2 + 1/2mV^2 + mgh = 1/2ks^2 + 1/2mV^2 + mgh

but with that we only have when the mass not hit the ground, the hard part is how with the same information the mass when rebound not hit the 15ft obstacle bellow the start point?

the information of the cord is what we need to find using different long cord and different mass...
The problem is that if energy is conserved you cannot avoid returning to the same height as you started. If the cord absorbs some energy (realistically it will) then you will return to a lower height. I don't know much about bungee cords. Do you have any specifications?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Solving Jumping Off a Disk Problem (d)
Replies
24
Views
2K
How Much Does the Spring Compress When a Man Jumps on a Scale?
Replies
1
Views
2K
High school Physics - Simple Harmonic Motion
Replies
6
Views
2K
Using energy concepts and possibly work bunjee jump problem
Replies
2
Views
2K
Calculating Energy Components in a Pogo Stick Jump
Replies
8
Views
4K
A Closer Look at Bungee Jumping Physics
Replies
26
Views
5K
Final amplitude with damping of bungee cord
Replies
8
Views
3K
I How Does Non-Stretchy Mat Material Affect Trampoline Performance?
Replies
2
Views
2K
Spacetime Physics (2nd ed.) problem 2-2: Bathroom scale and a Trampoline
Replies
5
Views
1K
Absolute motion analysis of pulley-spring system
Replies
10
Views
1K

Hot Threads

Recent Insights

Back
Top