Falling Definition and 1000 Threads

Homework Statement A (smooth) rope of length L and mass m is placed above a hole in a table. One end of the rope falls through the hole, pulling steadily on the remainder of the rope. Find the velocity of the rope as a function of the distance to the end of the rope, x. Ignore friction of...

Hello, I don't think I really understand the derivation of an equation of motion for a falling body under the force of Earth's gravity... I'm a little ashamed by this. I haven't been able to find someone asking quite the same question as I am about to ask. I completely understand that the...

If I try to accelerate an object to the left, its mass resists that acceleration. If I try to accelerate an object to the right, the same resistance occurs. If I try to accelerate an object forward or backward, the same resistance occurs. This resistance to acceleration is known as inertia...

A 60kg parachutist and her 7kg parachute fall at a constant 6m/s Find the force on the woman due to chute? My attempt: All I can gather from this is that the chute and her are not accelerating, so get are at terminal velocity?

Homework Statement You're a consultant on a movie set and the producer wants a car to drop so that it crosses the camera's field of view in time Δt. The field of view has height h. Derive an expression for the height above the top of the field of view from which the car should be released...

Homework Statement With what speed would mail pass through the center of Earth if falling in a tunnel through the center? Homework Equations W = -K K = 0.5mv^2 (vf)^2 = (vi)^2 + 2aΔx The Attempt at a Solution My main question is why can't I use the last equation I listed...

Homework Statement A falling object travels one-fourth of its distance during the last second of its fall. From what height was it dropped? Homework Equations none The Attempt at a Solution yf - yi = vit + 0.5gt^2 0.25x = 0 + 0.5(-9.8ms^-2)(1)^2 x = 19.6m

Hi, I'm sure this topic has come up before, however, it was always under the requirements of being realistic, i.e. taking drag, air resistance, Earth rotation and what not into account. Also, I couldn't find any equations so that I can do the math myself. Hence, here is my question...

Homework Statement A thin uniform pole of length 30 m is pivoted at the bottom end. Calculate the most probable point of rupture on the pole as the pole falls.Homework Equations I'm really not sure how to start.The Attempt at a Solution None, our professor gave us this as a challenge problem...

Homework Statement A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= 250 g and length l= 25...

Homework Statement A wet floor sign is pushed on the top and it starts falling. Just before hitting the floor the upper point of the sign sign hit a foot. The weight of the sign is 5 pounds (2.27 Kg or 22.24 N). The sign is 2 feet tall (0.61 m). Homework Equations With what force and energy...

Homework Statement A small rock is thrown vertically upward with a speed of from the edge of the roof of a 30.0-m-tall building. The rock doesn’t hit the building on its way back down and lands in the street below. Air resistance can be neglected. (a) What is the speed of the rock just...

Homework Statement A sphere of 4kg falls from a height of 70cm and lands on a spring of constant 2 *10² N/m. Whats the max velocity the sphere reachs? g=10m/s²Homework Equations Ep=m*G*h Ek=mv²/2 Eel=k*x²/2 Vmax=sqrt(2g*h) (internet source idk if this is right)The Attempt at a Solution I tried...

Homework Statement Using the data found in this chart, create a time-velocity table and draw a velocity-time graph. Once you have done that, calculate the acceleration of the orange as it falls to the ground. (table attached as image).Homework Equations I'm not even sure about this... I don't...

Homework Statement One end of the chain falls through a hole in its support and pulls the remaining links after it in a steady flow. If the links which are initially at rest, acquire the velocity of the chain suddenly and without frictional resistance or interference from the support or from...

How does our body absorb the force from falling? And if we roll or bend our knees while landing why is the force felt by our body less? Can somebody explain?

Hi. I am studying physics on my own from scratch, so far so good, though I've run into this concept I am struggling to understand. If we push a large rock over a cliff, it falls because of the pull of the Earth's gravity on it. This force is its weight and it makes the rock accelerate...

Lets say that I am falling down from a mountain. Then only thing that I have with me is a big stone. Let's say that when I have distance 50m from the ground,I put the rock down of my legs,and I jump(hitting my legs at stone). If my speed was 100 m/s,will decrease after jumping or that is...

If we let a thing from a height,earth force that with F=m*a=m*g=B(weight). BUT What is the power of earth,when the thing goes down(the power that force the thing at Earth too).I mean the different power,that keeps that in the ground. Logically the force of earth,is about the speed of thing,but...

A 1.2·kg block is tied to a string that is wrapped around the rim of a pulley of radius 7·cm. The block is released from rest. Assuming the pulley is a uniform disk with a mass of 0.37·kg, find the speed of the block after it has fallen through a height of 0.43·m. 2. F=mrω^2 and possibly F=mg...

Homework Statement The moon is smaller than the Earth and has a weaker gravity. On the moon's surface, the acceleration due to gravity is 1.6 m/s^2. You are on the moon and you throw a moon rock straight up. It reaches a height of 44 m. a) Find the moon rock's initial velocity. b)Find...

Homework Statement A brick is accidentally dropped from a window of a tall building and falls 160 m to the ground. How long does it take the brick to reach the ground? [b]2. Homework Equations [/b y=y initial+v inital +1/2 (αt^2) The Attempt at a Solution y=0+0+9.8 m/s^2(t)...

Homework Statement A diver steps off a platform 30m above the water. With what speed does he hit the water? Homework Equations v=intial v+at The Attempt at a Solution I reached an answer of 2.47 seconds, but I can't see how I got there anymore! Is this answer correct? Thank...

Falling polygons: meshing vs. stacking -- analytic solution needed I'm a game developer and not a mathematics specialist, so I'm not 100% sure if this question is correctly categorized. My problem is as follows. I'm building a game that's similar to Tetris, but in 3D instead of 2D...

Homework Statement http://puu.sh/57VmL.png A thin rod, 28.5cm long with a mass of 0.97kg, has a ball with diameter 7.81cm and mass 2.15kg attached to one end. The arrangement is originally vertical and stationary, with the ball at the top. The apparatus is free to pivot about the bottom...

Homework Statement A stick of mass M and length L is held vertically on a frictionless surface. A gentle push at the top causes the rod to fall from this position . Find the speed of its center of mass when it makes an angle θ with vertical . a) Use force method b) Use energy method...

Homework Statement A rod of mass m and length l is held vertically on a smooth horizontal floor. If the rod begins to fall from this position, find the speed of its CM when it makes an angle ##\theta## with vertical.Homework Equations The Attempt at a Solution This is a solved problem in my...

Hi there, I'm trying to work out how much force is produced if a climber was to fall onto a rope. I do realize that it would depend on the rope and whether it stretched or not but for this case let's just say it does not have any give in it. If I use the example of a climb who weighs...

So when a ball falls through a fluid in which it is submerged, it keeps displacing fluid as it descends, but the level of the fluid doesn't rise. So does the ball do work on the fluid? (Assuming there is no viscosity, the K.E would keep increasing, while potential energy decreases...that's...

A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 60.0° with the vertical. Find the velocity of the rain with respect to (a) the car and...

I'd like to graph the function of and object falling to Earth from a point high enough that air density has an effect on the rate the object falls due to gravity. I'm not really sure where to start though. I'm thinking about that guy that jumped from the highest point ever free-falled from...

Homework Statement Find the hill radius of Earth and calculate the velocity of an object falling from that radius (and from rest from the Earth's frame) at the point where it impacts the Earth. Relate this velocity to the escape velocity of Earth. Homework Equations Hill radius: r_h=R...

Homework Statement Alright so I was given the question " If two of the same object were dropped from the same height at different times, what would happen to the distance between the objects." Homework Equations The Attempt at a Solution I have thought about this for about a half...

Hello, I'm trying to levitate the iron core of an electromagnet at a certain postion. How can I calculate what the minimum currennt is that I need to put on the electromagnet to prevent the core from falling out at the bottom? Is there an equation to know at what position the core will be...

Okay guys, a different one for you. I am in the planning stages of building a structure that will simulate a motor vehicle collision. The process would be a motor vehicle will be hoisted to a specific height and then dropped. The height, and the weight of the vehicle will determine the...

Dear sir, Hi, Everyone. I have a question about entropy. If the object falls without air resistant (vacuum system) , Is entropy changed? If ΔS=0, it means reversible, is it possible that the object can go back to the original height? I know that it is impossible but can we explain that ΔS...

Homework Statement Hello, I was wondering if a falling function needs to fall on it's whole domain? I was solving a series with alternating sings. It says that if the series has alternating signs, that it converges if: 1) lim(n->0)an=0 2) an is a falling function I was solving this...

Here is the question: I have posted a link there to this topic so the OP can see my work.

Homework Statement In some amazing situations, people have survived falling large distances when the surface they land on is soft enough. During a traverse of Eiger's infamous Nordvand, mountaineer Carlos Ragone's rock anchor gave way and he plummeted 494 feet to land in snow. Amazingly, he...

I have some questions which I don't understand. Assume that all questions take place chose to surface of earth gravity = 10n/kg 1) a 57g tennis ball is dropped from a height of 90cm a) What is the gravitational potential energy of the tennis ball before it is dropped? b) What is the...

Homework Statement Determine force vs angle, that acts on the vertical wall from the falling dumbbell. Dumbbell falls without initial velocity. The mass of each bead of dumbbell is m. Homework Equations The problem need to be solved using only Newton's equations by writing them for...

Homework Statement Free-Falling Objects. Motion in One Dimension: Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally an acceleration less than 800 m/s2 lasting for any length of time will not cause injury; whereas an acceleration...

Homework Statement A chain AB of length ##l## is located in a smooth horizontal tube so that its fraction of length ##h## hangs freely and touches the surface of the table with its end B. At a certain moment, the end A of the chain is set free. With what velocity will this end of the chain slip...

Homework Statement A flatcar of mass ##m_0## starts moving to the right due to a constant horizontal force F. Sand spills on the flatcar from a stationary hopper. The velocity of loading is constant and equal to ##\mu## kg/s. Find the time dependence of the velocity and acceleration of flatcar...

Homework Statement An object of mass 0.5 kg is hung from the end of a steel wire of length 2 m and of diameter 0.5 mm. (Young's modulus = 2 x 1011 N/m2). The object is lifted through a distance h (thus allowing the wire to become slack) and is then dropped so that the wire receives a sudden...

A friend of mine asked me this question out of curiosity: If you shoot a bullet straight up into the air, how far would the bullet land from the point it went up? Possible factors: - Earth's rotation - air resistance What is the answer?

For outside observer, an object falling into black hole seems to freeze at event horizon and never cross the boundary and proceed inside the black hole. This is of course not the case in the falling objects own reference frame. Depending on the size of the black hole, a falling object may not...

I am trying to study the motion of a falling body in the earth’s gravitational field however not assuming a constant acceleration. I want to work out the distance traveled in a given time. We know that  a = \frac{{GM}}{{{r^2}}} Likewise, we can calculate that \begin{array}{l}...

From here: http://www.reddit.com/r/askscience/comments/f1lgu/what_would_happen_if_the_event_horizons_of_two/ (About a page down from the top. You can't miss it.) Imagine, just for a moment, that you are aboard a spaceship equipped with a magical engine capable of accelerating you to any...

So I saw a video of a falling slinky in slow motion where a slinky is held at the top and is let to be stretched by gravity until gravity and spring pulling force equal out, when the top is let free, the bottom stays still until the top actually falls down reaching the bottom and discharging its...