Falling Definition and 1000 Threads

This is a 2d problem. If I drop a ball with mass m from a height L over ground. How large is the interval that the ball can possibly be on if m = 1 g and L = 2m. Use the uncertainty principle \Deltax\Deltap ~h to determine the interval. Am I supposed to think of this as a classical...

Homework Statement Hi guys, I have a question on problem 4.11 in Kleppner and Kolenkow's mechanics book. A chain of mass M and length L is suspended vertically with its lowest end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length...

Homework Statement postively charged bead having a mass of .61g falls from rest in a vacuum from a height of 5.9 m in a uniform vertical electric field of magnitude 11600 N/C. The bead hits the ground at a speed of 19 m/s. acceleration of gravity is 9.8 m/s^2. find the charge on the bead...

Homework Statement A pen falls from the top of a roof. We know that it takes 1.5 seconds to fall the last 1/4 distance. Find the height of the roof from the ground. Homework Equations x=x_0 + v_0 * t + 1/2 gt^2 v=v_0 + gt The Attempt at a Solution Since the problem does not say...

Homework Statement An object with mass 10kg is dropped from a height of 200m. Given that the constant k in the equation is 2.5Nsm^-1 mv'(t) = −mg − kv(t) approximately how many seconds does the object hit the ground? Homework Equations v' + (k/m)v = -g The Attempt at...

This is my first post here so please bear with me if I'm doing something wrongHomework Statement A cargo plane is flying horizontally at an altitude of 10.1 km with a speed of 910 km/h when a large crate falls out of the rear loading ramp. (Ignore any effects due to air resistance.) How long...

I've been online searching for interesting stuff about maths and physics. I came across to this question in yahoo answers that i found quite interesting. The first equation would be working out how long it takes to reach the ground, and how fast it's going when it arrives. This is actually...

Homework Statement b) A person standing on the edge of a 100 m high cliff drops a 0.5 kg stone vertically downwards. Determine the final velocity of the stone after falling 100m, and its kinetic energy. Homework Equations Final velocity v = √(2gx) The Attempt at a Solution final...

A juggler performs in a room whose ceiling is 4.2 m above the leve of this hands. He throws a ball vertically upward so that it just reaches the ceiling. a. with what initial velocity does he throw the ball? b. what time is required for the ball to reach the ceiling. He throws a second ball...

Ok, so imagine observer A is moving along with a measuring rod of length L that is being slid along the ground by a rod that holds it steady by pushing it against the ground as it slides (no tilting whatsoever, the base of the rod remains firm against the ground), at a velocity comparable to c...

Homework Statement A bolt comes loose from the bottom of an elevator that is moving upward at a speed of 6.88 m/s. The bolt reaches the bottom of the elevator shaft in 3.90 s. How high up was the elevator when the bolt came loose? Homework Equations d= v(initial)t + .5at^2 The...

Homework Statement An object falls from height h from rest. If it travels .5h in the last second before hitting the ground, determine how long it takes to fall and the height h. xi = .5hm, t =1s, a = 9.8m/s^2, xf = 0m, Homework Equations Vf = Vi + at xf = xi + .5at^2 The Attempt at a...

The problem is: A snowball is dropped from the top of a building, evaporation causes the mass m of the snowball to decrease at a rate proportional to the snowball's speed as the snowball falls, so that M' = k * abs(y') where y denotes the vertical distance from the ground and k is a...

Hi this is my first post thanks to who ever contributes! Homework Statement A man drops a ball from the top of a 22m building. At the same instant his friend below throws a ball upwards at 22 m/s. What distance from the ground do the two balls meet. Ball A ------- v1 = 0 m/s a = 9.8m/s down...

If a apple falls on my head, what is the physical value that makes my head hurt?

Is a falling elevator a valid inertial frame? The title about says it. Is a body, (frame) free falling in a gravitational field a valid inertial frame as defined by SR? Thanks

Hello I was doing some research about falling objects and we did many experiments in it. Now I was wondering how can I simulate it . First I did some MATLAB programming with some simplified equations but now I wanted to make something more realistic and like this ...

Homework Statement A block of material of mass m and specific heat c falls from height h and reaches speed v just before striking the ground. Its temperature is measured immediately after it strikes the ground. If we ignore any change in temperature owing to interaction with the air, the...

Homework Statement If an object falls five meters during the first interval of time, what is the total distance fallen at the end of the second interval of time? (Galileo's Theory of falling bodies) Homework Equations The Attempt at a Solution I know that at successive intervals of...

If an object falls five meters during the first interval of time, what is the total distance fallen at the end of the second interval of time? (Galileo's Theory of falling bodies) I know that at successive intervals of time the distance fallen is proportional to the odd numbers. So I suspect...

I was bored, my internet was out (from the rain), and so was TV. So all I could was sit there and think... So I started asking myself, how much energy does a single rain drop have and how much electricity could THEORETICALLY (100% efficiency) be produced from falling rain? So when my internet...

In what condition is the acceleration of a falling parachute is zero?

Hi there, can anyone help me with this problem, I'll be grateful to received your help. It was like this, we were doing an experiment on collision and this is how it goes; We place a ramp on table and a sheet of paper at the bottom of the table but close to the edge. Then we put two...

as a magnet bar is falling in a copper pipe, it will reach terminal velocity due to the lenz's law. my experiment is changing on the mass of the magnet bar but not changing the magnetic field. what will happen in this case?

Homework Statement A metal ball having net charge 4.5 × 10−6 C is thrown out of a window horizontally at a speed 43 m/s. The window is at a height 63 m above the ground. A uniform horizon- tal magnetic field of magnitude 0.071 T is perpendicular to the plane of the ball’s tra- jectory...

What is the drag force on a magnet falling through a coil? I have found several sources online describing the drag force on a magnet falling through a conductive pipe. How might this vary if a coil is used in place of a pipe? Does the coil need to be connected to a circuit to create this force?

Back in 1921, Theodor Kaluza published his idea of a very tiny curled up fifth dimension, which I will refer to as the "w" dimension. In a space consisting solely of the x and w dimensions, space is cylindrical, and a ray traveling at the speed of light along x looks like a light wave, while...

Hi Everyone, After browsing for a bit and finding this forum to have some very smart and helpful people, I have decided to post my query here. After completing my A-Levels in English, Maths and Phsyics (U.K. Education) where I got a B,A and A respectively. Thereafter I worked in odd jobs...

I'm running an experiment where I drop a mass (99.7kg) a distance of 1.8m. The load is suspended from a very rigid structure through a steel cable. I currently have a load cell in series with the cable and mass. I acquire data at 1000Hz and my load cell tells me I have a peak force of about...

I was wondering how you could analyse such things as the acceleration of someone falling directly backwards. The head clearly moves faster than the feet but how can the acceleration of each be measured? What about the acceleration in the middle? I guess on a amore general level i am looking...

Homework Statement a light shines from the op of a pole 50ft high a ball is dropped from the same height from a point 30 feet away from the light , how fast is the shadow of the ball moving along the ground .5second later. So is the ball falling at 32ft/s^2 would we set it up...

please help me to find out what is the best and simple way to convert the energy of falling mass to into forward motion? i have to design and creat a vehicle which uses a mass falling over a short distance to power a vehicle up an inclined ramp.

Homework Statement 2 balls, each of mass M, are attached to each other by a spring with constant k. they hanged out by a rope, so they are in equilibrium, the rope was cut and they fall. do they Oscillate? Homework Equations effective g=g-a (vectors) when a=g, effective g=0. Fnet=ma...

Homework Statement A mass (weight 100g) is hanged on a spring inside a cubic box (side a=1m). Stiffness of the spring is 10N*m-1. Equilibrium state of the spring is right in a centre of the box. Now, we let the box fall to the ground from height h. Describe a behaviour of the mass inside...

Homework Statement Note that this is a first year, Calculus 12 DE question: The velocity,v, of an object falling through the Earth's atmosphere obeys the DE dv/dt=g-kv, where k is the called the drag constant and g is the gravitational constant. This equation states that the acceleration of...

If you attatch a falling mass to a load (electric motor, lightbulb, ect.), the mass accelerates more slowly than 9.8 m/s. I know the power of the falling mass is mgh. My question is how to get the mass to fall as slowly as possible, assuming a fixed mass (changing the power that the load is...

Homework Statement The problem consists of a block that starts off on a ledge. It has an initial vertical imperfection ie it is leaning over at the top such that when the top anchors are cut it will fall off of the ledge. I need to determine how far the block falls from the wall and the...

Homework Statement A chain of mass M and length L is suspended vertically with the lower end touching a scale. the chain is released and falls onto the scale. what is the reading of the chain when a length x is fallen? neglect the size of individual links Homework Equations dp = IMPULSE=F*dt...

Homework Statement Consider a flexible string of length L and mass M that is held vertically so that its bottom just touches the floor. The string is then dropped. Let the position of the top of the string be y and the position of the floor be y = 0. 1.1 Is every piece (for y > 0) of...

Homework Statement A 1250kg meteor rock fragment is momentarily at rest at an altitude of 3000km above the surface of Neptune. Neptune has a mass of 1.03x1026kg and a radius of 2.48x107m. Determine: how much work is done on the rock by Neptunes Force of gravity as the rock falls to...

http://www.youtube.com/watch?v=8MWNs7Wfk84&feature=PlayList&p=858478F1EC364A2C&index=2" , Edmund Bertschinger is talking about Einstein's field equations . during the lecture , under the title of : "Gravity as sapcetime curvature (GR viewpoint) " , he wrote : "Freely falling bodies move along...

how much does a falling object "weights"? Hi ev. the other day i was asked by a friend that does "aerial silk" (http://en.wikipedia.org/wiki/Aerial_silk, just found out it was called that :P) how much (still) weight should the beam (to which the silk is tied) hold in order to hold her weight...

Hi every body, I am new to PF so I apologise if a similar thread already exists. I am reading d'Inverno Introducing Einstein's Relativity. On page 226 describes tidal forces on freely falling particle in Schwarzschild metric, I tried to deduce step by step but I can't get final three equations...

Homework Statement The three thin rods shown below are initially at the same angle, with one rod twice as long as each of the others two. Rod X is made of brass (density = 8.6 g/cm3), the others are made of aluminum (density = 2.7 g/cm3). All rods are released from rest at the same time...

From what this layman can comprehend of Einstein's relativity is that mass causes a curvature of space-time. This space-time is a 4-dimensional geometrical construct. An object moving through a gravitational field would deviate from its straight space-like path in order to achieve the closest...

I was wondering since when you walk you are pushing backwards, therefore frictions pushes you forwards, so when you fall on ice why do you feet slide forward? Or does that just depend on how you fall? Thanks!

Homework Statement A 79 kg skydiver can be modeled as a rectangular "box" with dimensions 25 cm x 39 cm x 1.8 m. What is his terminal speed if he falls feet first? Homework Equations The Attempt at a Solution So I am not sure what I am doing wrong, here is what i did...

A 195 g block is dropped onto a relaxed vertical spring that has a spring constant of 1.6 N/cm. The block becomes attached to the spring and compresses the spring 14 cm before momentarily stopping. (a) While the spring is being compressed, what work is done on the block by the gravitational...

When a magnet is dropped from rest near an iron wall, it accelerates downward due to gravity at constant acceleration. It also accelerates toward the wall, and the closer it gets to the wall, the greater the acceleration. Can anyone refer me to a solution that would give the position of the...

Homework Statement A 500g rock is thrown straight down from a bridge and hits the water 5.2 m below. If the rock strikes the water at a speed of 12.5 m/s, what was the initial speed of the rock? Homework Equations I'm not totally sure... The Attempt at a Solution I have no idea...