Jump Definition and 323 Threads

Homework Statement A diver jumps off a 3.00 meter high diving board with an initial velocity of 1.75 m/s vertically upward. a) What is the diver's veolcity when she reaches the water? (assume the surface of the water is 3.00 meters below the board.) b) What is the highest point the diver...

I had to do but it was given as a shortcut that and the result was How does one go from the 2nd to the 3d when there isn't an x^2 in the beginning there?

Am I right in saying that in a Hydrogen atom when an electron jumps from the second orbit to the first one the energy change is more than any other possible jump (when the jump is not to the first orbit). The calculations seem to support me but it doesn't feel right.

How does it work?

Hi, I'm doing some research on developing a physics-based platform game and I want to see how the gameplay will feel if the environment and physics were made to scale as realistically as possible. Since one of the core features of a 2D platformer is jumping, I need some figures on how much...

I'm having a lot of trouble wrapping my mind around this... It seems there are some similar questions in this forum, but I can't tell if the answers can apply to my question... I'm sorry if this is an extra post: I am traveling in a vacuum, on a train, at the speed of light, from planet A to...

I'm having a debate with a good friend and we haven't come to agreed yet. I'm very sure, yes, we will jump higher. I summarized this from several sources which explained my view: http://i.imgur.com/nTsqVnc.jpg But we come to the point where he states: Is he correct or is it wrong...

Compared to humans, why can some animals jump many more times their size? I'm thinking of cats here which apparently can jump up to seven times their length. From a physics standpoint, what would be an approximate answer to this, and how would determine it using scaling arguments?

I found the explanation of the radiation here, in the document of the Purcell Simplified: http://physics.weber.edu/schroeder/mrr/MRRtalk.html I like it, however I'm ucertain how to fit this to the light, as photon. Am I thinking correctly, that this figure fits also the case when a...

Homework Statement Suppose you have a friend who wants to go bungee jumping for her birthday. She wants to jump off a high bridge over a river and be able to touch the water below right when she gets to the bottom of the bungee cord extension. You want to double-check all the physics of...

Homework Statement The deck of the boat is parallel to the dock as you jump from the boat and the direction of your velocity as you jump is 30° above the horizontal. If the boat was stationary when you jumped and 1.5 m away from the dock, what is the horizontal speed of the boat (in m/s) after...

Homework Statement A block starts at rest and slides down a frictionless track except for a small rough area on a horizontal section of the track It leaves the track horizontally, flies through the air, and subsequently strikes the ground. The acceleration of gravity is 9.8 m/s2 . What is...

Out of curiosity, is the difference between graduate level vs. upper division undergraduate larger than the difference between intro undergrad vs. upper division undergrad as far as treatment and abstraction of the subject so halliday to griffith's a larger jump than griffith's to jackson?

Hi Guys I have problem to express the jump process as following ways. Please let me know your ideas~! Thank you so much. ------------------------------------------------------------------------- Let (Xt)t≥0 be an irreducible continuous-time jump process on a nite state space...

Ok, so I'm using an arduino with an led matrix and a homemade pressure sensor to figure out the height of a vertical jump and then display the info back. First I get the amount of time between when the person left the board and when they land back on it. I then divide the time in half and use...

Homework Statement An exceptional vertical jump from rest would raise a person 0.8m off the ground. To do this, what constant force would a 70kg person have to exert against the ground? Assume that the person lowers himself by 0.2m prior to jumping and remains in a standing position while in...

I am trying to figure out what happens to the power when a prompt jump occurs. From Nuclear Reactor Analysis by Duderstadt and Hamilton, a prompt jump approximation can be done to yield the following equation: \frac{P_{2}}{P_{1}} = \frac{\beta-\rho_{1}}{\beta-\rho_{2}} Now the question is...

Hi, I'm in the process of building a marble run out of brass wire using 15mm steel ball bearings. For ease of visualisation, it will be similar in principle to this: http://www.youtube.com/watch?v=0FRYX-kcZ9k&feature=relmfu I want to include a "jump" where the marble travels up a ramp at...

Felix Baumgartner ...what a trooper! Question - what caused the radical spinning upon his intial jump from the balloon? No aero drag at that altitude ?? or was there?

Homework Statement A skier (m=55.00 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. (A)If h = 6.80 m and D = 10.20 m, find H.(B)Find her total kinetic energy as she reaches the ground. Homework Equations KEi+PEi=KEf+PEf (law of...

I'm taking Calc II currently and trying to get a head start on diff eq. Does anyone know some good online resources that would assist me in this? Video lectures, notes, problems, ect... I'm very happy with Adrian Banner's calculus lectures and was seeing if there was anything else similar...

A good jump in the long jump event is 3.7m. If the jumper leaves the ground at an angle of 25°, what speed must he need to jump the 3.70m distance? →Could you use this equation: vf²=vi²+2aY aka (final velocity)²= (initial velocity)²+2(acceleration)(distance in the y-direction) →So, that...

A good jump in the long jump event is 3.7m. If the jumper leaves the ground at an angle of 25°, what speed must he need to jump the 3.70m distance? →Could you use this equation: vf²=vi²+2aY aka (final velocity)²= (initial velocity)²+2(acceleration)(distance in the y-direction) →So, that...

Homework Statement Gravity varies in two different places by 0.01 m/s^2. The jumper has a mass of 72 kg. What is the difference in jump height in each location? I have a couple of height measurements, but I'm pretty sure they are irrelevant because I am looking for a difference (and the...

Hi If a person jumps(countermovement jump) then there would be 2 impulses that is the 1st impulse would be when person sits down, getting ready to jump and the 2nd impulse would be when he jumps back on to the ground. 1)I want to know the relationship between these 2 impulses. 2) How can we...

Hi, my first post here so be gentle with me :) Firstly I have no background in physics other than watching the sky at night so any complex mathematical explanations will be lost on me, I'm just looking for an intuitive way to understand what is happening in a system that's quantized. All my...

How does the "enclosed" insect-cocoon jump 400 times its own length!? Hi! NOTE! this is not about the "mexican jumping beans" which barely move or roll, they never jump but only move a little bit and tumble. There are several insect species that have remarkable jumping cocoons. Its...

What would be a good example of a function that would give a jump discontinuity without using piecewise or absolute values?

Say two girls spin a jump rope, of length ∏ meters, so that the only nodes are where the girls hold the rope, ψ= sin(x)exp(iω_1t) (actually there are no nodes at the girls hands as where they hold the rope goes in a smallish circle). Now instruct the girls how to shake the rope so as to most...

Hi Friends, I am not expert in atomic science but very interested. I have few questions. I hope some one may help me to understand better. 1. Light (photon) appears when electron jump from one level to another level due to heat energy. 1a). Is the heat affects only outer level...

Watch this video (http://www.youtube.com/watch?v=fwXOr47EJ1E) and puke! This guy says that the English language must have pre-dated the Roman occupation of Britain, based upon the fact that the names of villages in the Cotswolds (and what the heck's a Cotswold?) end in the syllable "-ey", which...

Hello! This problem has been driving me crazy all week long, and now I am down to the last few hours before the assignment is due. Any help would be greatly appreciated! Homework Statement An average person can reach a maximum height of about 60cm when jumping straight up from a crouched...

Homework Statement Matt(44kg) was going to do a bungy jump(spring constant=105N/m) that is 30m long when it's unstreched.The rope is attached to a platform 65m above the ground.What is the maximum acceleration closes to the ground. Sorry for my bad english, i was trying to translate my...

"Jump Efficiency Theory". I am young so please no mocking. This is a theory i have created that judges how efficient a jump is with respect to a specific distance. This theory is going to be used mainly for the Long Jump sport. For example let's say you have to jump across a whole with a...

When electrons jump from one shell to another energy has to be released right? Why is only light energy released? Why not other forms of energy?

Homework Statement An athlete executing a long jump leaves the ground at a 29.6° angle and travels 7.43 m. What was the take-off speed? I have 4 unknown variables: t, initial velocity in the x direction (Vix), initial velocity in the y direction (Viy). and the initial speed which I'm...

Here I have my PDE: http://desmond.imageshack.us/Himg718/scaled.php?server=718&filename=pde.png&res=medium I have found the solution by using the method of characteristics two times, one for x<0 and the other for x>0. I have: U(x,y) = o for x<0 and U(x,y) = Uo(x-1)/(1+Uo*y) for x>0...

Homework Statement Jump length: 3.4m jump angle:55 degrees Coeficient of friction of snow: 0.05u Height you need to increase off end of jump: 0.7m Distance required off jump: 4.0 m Velocity required:? Homework Equations The Attempt at a Solution

Hello Physics Mavens, Just watched one of my cats make two upward jumps; both with pinpoint accuracy. (Cats are amazing creatures.) One height was ~74cm above the floor; the other height ~81cm. He cleared both ledges by ~3cm and softly touched down on his paws at--what seems to be--near...

1. A physics professor did daredevil stunts in his spare time. His last stunt was an attempt to jump across a river on a motorcycle. The takeoff ramp was inclined at 53 degrees, the river was 40 m. wide and the far bank was 15 m lower than the top of the ramp. The river itself was 100 m. below...

Ok so I'm trying to find the maximum length of fall before the bungee brings the jumper to a stop? So I've chosen a few arbitrary starting heights: 50m, 55m, 60m and a few arbitrary bungee spring constants: 25 N/m, 30 N/m, 35 N/m. How would I go about in approaching this problem? I think this...

Homework Statement Consider a particle in an infinite square well of width
= 1. The particle is in a state given by: Phi=A(1/2-|x-1/2) a=1 b) Find the general form of the expansion coefficients (the Fourier coefficients, right?) for expanding the function in terms of the...

Imagine an athelete that weighs 180 pounds (81.6 kg) is able to jump 20" (0.51 meters) vertically. How high could he jump if he were able to decrease his weight to 170 pounds (77.1 kg)? I think the basic idea here is to find out, given the mass, what force is required to reach the specified...

Homework Statement The question is as following: a) A dog in a stunt takes a jump off a rook which is 40 m high above the ground and lands on the next building which is of the same height , the gap between the two buildings is 6m @ the velocity of 8 m/s .Find the range of angles at which he...

Homework Statement What is the best angle to do a long jump from a 20 metre running start. Homework Equations What is the terminal velocity of the run up? Maximum height of the jump Horizontal and verticle components The Attempt at a Solution Hello there, I am doing an EEI on the...

This is not a homework/coursework problem, but I came across it and wanted to check my answer. Homework Statement As in the diagram, there are two blocks of mass M and m. The mass m is suspended above M by a spring of spring constant k. Initially, the block m is pushed down with a force...

Please help me with this problem. many thanks :) A 55-kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist her downward motion. Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a...

Firstly, I've been going over your forums for about fifteen minutes, and am taken aback by the intellect I have come across. I never took physics, but wish I had. Right out of high school, I went into construction, and never got the chance to go to college. I was always good at everyday Algebra...

Homework Statement I'm trying to calculate a value for gravity based on a known jump height and time. It's working when the take-off and landing heights are the same but I'm struggling for a solution if the landing point is higher than the take-off. I'm more interested in understanding a...

I'm trying to understand why monotone functions can only have jump discontinuities. I've seen formal proofs, but I don't find them intuitively convincing; my imagination can still conceive of an increasing function which is just a bunch of scattered points. To take a simple case, why can't you...