Jump Definition and 323 Threads

Julia is a high-level, high-performance, dynamic programming language. While it is a general-purpose language and can be used to write any application, many of its features are well suited for numerical analysis and computational science.Distinctive aspects of Julia's design include a type system with parametric polymorphism in a dynamic programming language; with multiple dispatch as its core programming paradigm. Julia supports concurrent, (composable) parallel and distributed computing (with or without using MPI or the built-in corresponding to "OpenMP-style" threads), and direct calling of C and Fortran libraries without glue code. Julia uses a just-in-time (JIT) compiler that is referred to as "just-ahead-of-time" (JAOT) in the Julia community, as Julia compiles all code (by default) to machine code before running it.Julia is garbage-collected, uses eager evaluation, and includes efficient libraries for floating-point calculations, linear algebra, random number generation, and regular expression matching. Many libraries are available, including some (e.g., for fast Fourier transforms) that were previously bundled with Julia and are now separate.Several development tools support coding in Julia, such as integrated development environments (e.g. Microsoft's Visual Studio Code, with extensions available adding Julia support to IDEs, e.g. providing debugging and linting support); with integrated tools, e.g. a profiler (and flame graph support available for the built-in one), debugger, and the Rebugger.jl package "supports repeated-execution debugging" and more.

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  1. E

    Does Gaining Muscle Mass Affect Your Vertical Jump?

    I've been bothered about this for a while now. As a volleyball player, I am constantly looking for ways to increase my vertical. So, my question is: Will an increase in muscle mass decrease my vertical? On one hand, I am getting stronger and therefore should be able to push harder off the...
  2. S

    MHB Discontinuity: Jump discontinuity

    I earlier posted about point discontinuity. It became overwhelming pretty quickly. Now I would like to focus this thread at jump discontinuity specifically, if you don't mind me posting multiple threads about discontinuity. From what I understand, "jump discontinuity" occurs where the left-hand...
  3. J

    I Can Monte Carlo Wave Functions Capture Driven and Dissipative Quantum Dynamics?

    Hi, I'm trying to study the quantum dynamics of a trapped ion phonon laser, the ion is explained by the master equation and hamiltonian given in this article, http://arxiv.org/pdf/1412.1863v2.pdf. I've been trying to use a Monte Carlo wave function approach but it seems to only describe...
  4. A

    Max speed and tension of bungee jump?

    Just signed up, hi everyone! 1. Homework Statement A man weighs 150 lb, and attaches a bungee cord having a stiffness of k = 500 lb/ft, to his feet. If he jumps from rest off the side of a bridge, determine the required unstretched length of the cord so that he can just touch the surface of...
  5. F

    Applied Nonlinear Dynamics & Chaos: Is It Possible to Jump In Mid-Book?

    Here is the table of contents of Nonlinear Dynamics and Chaos (by Strogatz) Overview Flows on the Line Bifurcations Flows on the Circle Linear Systems Phase Plane Limit Cycles Bifurcations Revisited Lorenz Equations One-Dimensional Maps Fractals Strange Attractors Last quarter, there was a...
  6. I

    How High Can You Jump on asteroid 243 Ida?

    Homework Statement The asteroid 243 Ida has a mass of about 4.0×1016kg and an average radius of about 16 km (it’s not spherical, but you can assume it is). If you can jump 61 cm straight up on earth, how high could you jump on 243 Ida? (Assume the asteroid’s gravity doesn’t weaken significantly...
  7. G

    How does mass of the bungee jumper effect a safe jump

    Homework Statement physics major practical, I was supposed to change the mass and find how it effects the safety of the jumper.But since hooks law doesn't follow bungee cord i really can't find a relationship.Homework EquationsThe Attempt at a Solution I used a bungee cord and hung different...
  8. P

    What spring constant would I need to jump my height

    In my springs what would the spring constant need to be If I am 1.8m tall and I weigh 68 kg
  9. Z

    What Factors Affect the Impulse in a Bungee Jump?

    Homework Statement An small doll is attached to an elastic cord which is suspended from a support as shown. An accelerometer is attached to the doll. The doll is allowed to fall and produces the graph shown. When the recording system is started the doll is stationary at the upper support...
  10. B

    Forces on a Skydiver during the initial frefall phase of the jump

    Homework Statement A skydiver is jumping out of an airplane. During the first few seconds of one jump, the parachute is unopened, and the magnitude of the air resistance acting on the skydiver is 251N. The acceleration of the skydiver during this time is 5.96 m/s^2 [down]. Calculate the mass of...
  11. J

    Horizontal open channel flow -- Hydraulic jump calculation

    Dear Fellow Engineers I'm having an issues with my calculations. This case concerns a open channel flow that start off being supercritical on the left and turns into subcritical flow after a hydraulic jump. Given: Volume flow rate Q = 0.16m^3/s Width of the channel b = 1m Resulting...
  12. Rumplestiltskin

    Felix Baumgartner's parachute jump from space -- forces and velocities....

    Homework Statement a)ii) Calculate the upward force F acting on Baumgartner at this point. (3 marks) total mass of Baumgartner = 95 kg g = 9.8 ms-2 b) Describe the shape of the graph between 30s and 70s. Explain the velocity changes in terms of changes in the air through which Baumgartner was...
  13. Bdhillon1994

    The End of the Ski Jump - Optimizing Launch Angle

    Homework Statement A ski jumper leaves the ski track moving in the horizontal direction with a speed of 25.0 m/s as shown in Figure 4.14. The landing incline below her falls off with a slope of 35.0°. Where does she land on the incline? I've attached an image of the problem, my work is below...
  14. W

    Bungee jump -> differential equation -> simulink simulation

    Hello guys, I found this forum using google because I need help with simulating bungee jump model. I've already done that with zero initial values and it looks good but I want it more realistic : Let's say L is the length of rope so elasticity force starts acting when y=L so logically time...
  15. Guidestone

    Why don't electrons jump between the turns of a coil?

    Hey guys. I just want to know why electrons in a coil always follow the turns instead of jumping from one turn to another. I mean, in many cases the turns are very close to one another. Also, if I'm not mistaken, electrons travel the shortest distances. Thank you!
  16. J

    Why does jump starting a car not burn the battery?

    So I have a good car battery at around 12 V and a bad car battery discharged to 6 V. I hook up the batteries (sitting in the cars) with jumper cables. Now, before I turn the ignition switch on the dead battery car, there is effectively a circuit between the the good battery and the bad...
  17. E

    Easy conservation of energy problem? (long jump)

    Homework Statement m(person) = 60kg v1 = 3.0m/s v2 = 0 d = 2m y1 = -1m y2 = 0 A person is completing a long jump. At event 1 they are 1m in the air and are moving at a rate of 3.0m/s. At event 2 they are at rest on the ground, 2m from their initial landing place. What is the stopping force...
  18. C

    Projectile Motion Long Jump Question

    Homework Statement Ms. Bongiorno is competing in the Olympics in the long jump. She jumps 7.59m horizontally and is in the air for 0.72s. a) With what speed did she jump? b) At what angle did she jump? Homework EquationsThe Attempt at a Solution My attempt at the solution is shown below. Can...
  19. King_Silver

    Ski Jump Ramp: Calculating Gravitational Work, Total Speed, and Air Drag

    Homework Statement A 72 kg skier leaves the end of a ski-jump ramp with a velocity of 24 m/s directed 25◦ above the horizontal. The skier returns to the ground at a point that is 14 m below the end of the ramp with a total speed of 22 m/s. (a) What is the rate at which the gravitational force...
  20. N

    Strange acceleration graph during a jump

    Hi! I have just performed some experiments with my phones accelerometer, and plotted the acceleration as a function of time from the raw data. The experiments I did was: jumping down from a chair jumping from the floor and up let the device fall toward a bed When I analyze the graphs, I think...
  21. C

    Troubleshooting a Simulation: Acceleration & Velocity Lost in a Jump

    Hello! I have been trying to make a simulation and it doesn't quite work right, don't exactly know why. I have two questions! 1. Acceleration I have been trying I need a formula that uses. frames till full speed (f) (if framerate is 60fps and this value is 60 then player is at full speed...
  22. S

    An athlete executing a long jump leaves the ground at a 29.5

    Homework Statement An athlete executing a long jump leaves the ground at a 29.5∘ angle and travels 7.69m . A- What was the take off speed? B- If this speed were increased by just 4.0%, how much longer would the jump be? Homework Equations - Unfortunately I'm totally stuck and I'm not sure...
  23. K

    Find the force which makes the box jump

    Homework Statement What force one need to push the box with mass ##m_1## for the box with mass ##m_2## to jump when the force disappears? Homework Equations Newton's second law. The Attempt at a Solution System, when the force is applied: System, when the force disappears: ##F## is the...
  24. L

    Conservation of momentum of a frog jump

    Homework Statement A frog of mass m jumps from the edge of a plank of mass M of length L to the other edge. The plank is on water and is free to move, assume no friction whatsoever. What is the minimum value of the speed of the frog ? Homework Equations Conservation of momentum and energy Some...
  25. M

    Bungee jump height/spring energy

    Homework Statement Imagine that you have been given the job of desiging a new bungee jumping platform. Customers of mass 53.0 kg will step off a platform, attached to a rope of unstretched length 52.6 m and spring constant 17.0 n/m. How far below the platform will the end of end of the rope...
  26. H

    What constant force does the floor exert

    Homework Statement A 74.4 kg person falls straight down from a 1.96 m height (measured from his feet) and lands with weight distributed equally on both feet. To soften the blow, he bends his knees so that it takes 0.906 s for him to stop once his feet touch the ground. What constant force does...
  27. jedishrfu

    Sports Physics and the Long Jump

    An interesting article on long jump physics http://www.wired.com/2015/02/physics-record-breaking-long-jump/
  28. S

    Calculating Kangaroo Jump Distance: How High Can They Go?

    Homework Statement How high can a kangaroo jump. He is 66.5 kg, exerts 1881 N force on the ground when jumping, and reaches a velocity of 6.08 before leaving the ground (at 1 m). a=18.48 Homework Equations F=ma The Attempt at a Solution looking for distance. vf^2=vi^2+2ax 36.97=2(9.8)x x=1.88
  29. M

    Physics in vertical jump and basball hit

    Homework Statement Okay so these are from movies. I am trying to prove them right or wrong using physics. how can I figure out the pounds of force of a vertical jump when I have the: height of the jump = 6 feet Time to reach top = .797 sec Mass of person = 100lbs 2. How can I figure out this...
  30. M

    How fast is Wolverine moving during his jump at the very end

    Or is there a way to calculate his speed? I know that since he's technically moving backwards, it's not the same speed as the train. The train's speed is about 300 mph.
  31. H

    Minimum Height Needed for Bungee Jump Problem

    this problem involves a man jumping off a bridge with a bungee chord holding him. he weighs 102 kg and the stretch constant of the chord is 167n/m. And there is a 12N air resistance. the length of the rope when slack is 20 ft what is the minimum height needed for him to do this? my attempt: i...
  32. O

    Why a man on the Moon can jump 21 times higher than on the Earth

    It's generally said that a moon walker should be able to jump six times higher on the moon, than he can on Earth, which sounds sensible since gravity is one sixth , but consider this... Two men , one on the Earth, one on the moon, both bend their knees the same amount ready to do a 'standing'...
  33. W

    How does the temperature of the electrodes affect the spark in a sparking plug?

    When I connected my car with a flat battery to another working car I was told to attach the positive connection to the positive connection but I was told to attach the negative connection from the working car to a piece of metal on the car(preferably in the engine bay) instead of to the negative...
  34. STEMucator

    Solving for Unstretched Length in Jump Problem: ##l_0 = 97.5m##

    Homework Statement The ##m = 75kg## man jumps off the bridge with ##v_1 = 1.5 m/s##. Determine the unstretched length ##l_0## of the cord in order that he stops momentarily above the surface of the water. The stiffness is ##k = 80 N/m##. Picture...
  35. T

    Bungee Jump: Conservation of Energy

    Homework Statement A bungee jumper of mass m drops o ff a bridge and falls vertically downwards. The bungee cord is elastic with natural length L and stiff ness k. Deduce that at the lowest point of the fall, the cord is stretched by an amount: x=mg/k(1+√(1+(2kl/mg)) Homework Equations...
  36. djh101

    If you had to jump from very high, what would you use as a parachute?

    If you had to jump out of something, say a plane or a tall building, what sort of objects would you try to grab onto to slow your decent? Curtains? A blanket or tablecloth (if you can find one)? Your jacket? A door (or other large, flat object of some sort)?
  37. M

    Solve the Elevator Jump Problem: 9.8m/s

    Okay, so I know that if you are in a free falling elevator and you jump up you will hit the ceiling, something you could not do in an elevator that was still. But if the elevator was falling at a constant velocity, say 50 miles per hour, when you jump up will you also hit the ceiling because you...
  38. C

    Green's functions for ODEs, jump conditions

    Questions about Green's functions for ODEs, jump conditions I'm having a hard time understanding Green's functions which have been introduced quite early on in the course, and which I think hasn't been well motivated. I can't find any other resource which explains this at this level (have only...
  39. M

    Jump Pack Tech Calculation issues

    My company is working on a few concept ideas for our field. Currently we are looking at jump packs concept work. We are looking to lift a human about 180 pounds, and about 50-60 pounds of gear = 230 Pounds Total. Our goal is to lift that weight about 20 Feet in the air while the subject is in a...
  40. Y

    Projectile Motion Jump Question

    Homework Statement A person jumps 8.9m. The person's takeoff speed was 15m/s. What is the angle relative to the ground at takeoff? Homework Equations The Attempt at a Solution I found t using the kinematic formula to be 0.5s using the formula. d=vit+1/2at^2. Can someone tell...
  41. R

    Vertical jump height from force plate

    Hi guys I've a problem calculating the vertical jump from ground reaction force. We tested a person with a force plate, and we got this curve as a result: Homework Equations These are the equations, sorry for the danish language, but just look at the equations and not the text...
  42. S

    How Long Would It Take an Astronaut to Land After Jumping on an Asteroid?

    Homework Statement Imagine that you are helping NASA plan a manned expedition to an asteroid. The asteroid has a radius of 20km, and a surface gravity of 0.034 m s-2. NASA are concerned that the gravity on this asteroid is so small that if an astronaut inadvertently jumps, it would take too...
  43. T

    Calculating the Speed Needed for a Successful Motorcycle Jump Across a River

    Problem: A motorcyclist is about to jump across a river. The takeoff ramp is inclined at 53 degrees above the horizontal, the river is 40.0m wide, and the far bank is 15.0m lower than the top of the ramp. Ignore air resistance. What must the motorcyclist's speed be at the top of the ramp in...
  44. C

    Help science project due tomorrow - Figure Skater Jump

    Help science project due tomorrow -- Figure Skater Jump Hello, I need help on my physics project that is dues tomorrow. The project is about the energy conservation of a figure skater doing a waltz jump. There are four stages that I explain her kinetic, potential and total energy. For stage...
  45. C

    Find the initial speed of jump using range and max height

    Homework Statement A dog jumps a distance, L, and a maximum height, H, where the dog only has horizontal velocity when it travels through the hoop. What is the speed of your dog when he leaves the ground? What is the speed of your dog when he goes through the loop? Both answers should NOT...
  46. A

    Why are photons released when electron jump states?

    I've always taken this for granted. Now I am looking for an answer. When electron jumps from a higher orbit to lower orbit it releases energy. Why is the energy in the form of photon? I will take another example which will make my question easy to understand. When two electrons are kept...
  47. A

    Dynamics/Kinematics - Jumper beats record jump

    Homework Statement The jumper is 60 kg and wants to beat the school's record jump, 1.1 m. She bends her knees a distance of .5 m before jumping. How many Newtons must Fjump be to for her to beat the record? Homework Equations ma = ƩF V2 - V02 = 2a(X - X0) My teacher stated I would just need...
  48. K

    Geiger counter unaccounted jump in count rate

    I am in a lab class and we are currently measuring count rates for a specific source. Yesterday we ran a program that runs 3 second gate times on a CS-147 source with a voltage of 500v running through the detector, and a threshold of .5v on the counter. This 3 second gate time was to be repeated...
  49. R

    Why did KVA increase while KW decreased during furnace melting process?

    Hi Guys, So we have a melting furnace that is melting Aluminium. After 2 days of holding a melt to see how the furnace performs in a holding situation, I changed the PID control to have a longer sampling time and hence smoother control. What I noticed was the KW seemed to drop, although the...
  50. L

    Projectile Motion Diver Jump Question

    A diver springs upward from a board that is 3.60 m above the water. At the instant she contacts the water her speed is 13.1 m/s and her body makes an angle of 67.3 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and (b) direction...
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