Falling Definition and 1000 Threads

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 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...

Homework Statement A mass m is attached to a spring(massless) that is located inside a massless box. The box is falling under gravity. When the box starts to fall the spring is in it's equilibrium position and the box sticks to the ground when it hits it. -The box is a distance H from the...

Homework Statement A wooden rod of negligible mass and length 80.0 cm is pivoted about a horizontal axis through its center. A white rat with mass 0.490 kg clings to one end of the stick, and a mouse with mass 0.240 kg clings to the other end. The system is released from rest with the rod...

(i) how you solved this problem, An object of mass 10 kg is dropped from a great height. (a) If the object is subjected to air resistance equivalent to 10 times the instantaneous velocity, find the velocity. (b) How far does the object drop after 5 sec? (ii) what you got as a solution...

Homework Statement A particle of mass 7*10e-5 kg and charge 1e-6 C from point A to point B a distance of 3 m in the Earth's gravitational field. The kinetic energy of the particle decreases by 5.3mJ during this movement. The acceleration of gravity is 9.8 m/s^2. What is the potential...

Homework Statement A ball rolls horizontally off the edge of a tabletop that is 1.40 m high. It strikes the floor at a point 1.56 m horizontally away from the table edge. (Neglect air resistance.) (a) How long was the ball in the air? _____ s (b) What was its speed at the instant it...

Hi guys, quick and simple question! If you allow 2 objects with different weights but exact same shape to free-fall in the presence of air resistance will they hit the ground at the same time (assuming terminal velocity isn't reached by either object). I'm pretty sure the heavier object hits...

Homework Statement Grains of sand of mass 2.90x10^-3 g each, fall from a height of 0.5 m on a sticky surface at a rate of 45 grains per second per cm^2. What pressure does this shower of sand exert on the surface, assuming that air resistance can be neglected? Homework Equations...

Homework Statement The height of a helicopter above the ground is given by h = 3.00t^2, where h is in meters and t is in seconds. After 2.00s the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground Homework Equations Xf = Xi + VxT + .5at^2...

As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due to gravity is the positive quantity g...

Water flows over a section of a waterfall at the rate of 3.2 104 kg/s and falls 33 m. How much power is generated by the falling water? watts i tried to use the power equation but I am just not sure how the numbers relate. help please?

Hey everyone, THIS IS NOT A HOMEWORK QUESTION. This is a question I think I know the answer to but I want to see what you get to check my answer. Here is the setting. You take an object up into the atmosphere. Far enough away so that the acceleration do to gravity of the Earth is 1 m/s^2...

Homework Statement An object falls from the top of a 103.6m high building. The vertical distance between two consecutive windows A and B is 4.0m. The first window/storey is also 4m from the top of the building. The object reaches window B 0.1s after it has reached window A. Which...

Homework Statement A vertical square loop of copper wire with sides of length 100 mm is falling from a region where the magnetic field is horizontal and of magnitude 1.2 T into a region where the field is zero, as shown in the diagram below. The diameter of the copper wire is 1 mm. [The...

Homework Statement A particle falls freely through a distance of 1.00 m starting from rest. Assume resume that g = 10 m/s^2. How much time does it take to fall? (4E-1) Homework Equations I think a=vf-vi/t The Attempt at a Solution I've tried 10m/s^2=1/10m/s-0/t And tried to...

Calculating effects of air resistance on a ball of mass 0.67kg, being dropped from a height of 4.93m. I have worked out theoretically what time it would take without air resistance using s=ut + 0.5at(squared) however i cannot find an equation that will factor in air resistance. thanks

I have a bunch of ideas how to solve this problem, but I cannot figure out which one is right... A stone is released from rest at the Moon’s orbit and falls towards the Earth. What is the stone’s speed when it is 96,000 km from the center of the Earth? Thanks, Adam

Homework Statement A charged water droplet of radius 0.02 mm remains stationary in air. If the electric field of the Earth is 100 N/C downward,what is the charge on the water droplet? By comparison with its neutral state, how many electrons must the water droplet have gained or lost? [...

I got this question on a sample test but I don't know how they want me to answer it Q.) Show that for a falling body, the total amount of energy is constant at any point I suppose I could state the potential energy then draw a graph of how the potential energy is converted into velocity. Is...