Falling Definition and 1000 Threads

I posed this question to my teacher: I have a 2 kg object and it sits at rest on the floor. The force is mass * acceleration, so it's about 20 N. Now I drop the ball from, say, 20 feet above the ground. Same mass, same acceleration, so it has the same force, 20 N; but we know the object hits...

Homework Statement "A friend leans out of an upper window of an apartment building and drops a canned beverage of your choice to you on the sidewalk below. Unfortunately, you aren't directly beneath the window; instead, you are standing where the angle to your friend is 75 degrees above...

Seen as i had difficulty understanding this little topic and with my AS level exam soon, i figured i should find somewhere to ask without having to wait while class, so here goes... I had some questions to do (but this isn't about homework!) i couldn't seem to be able to get the right answer...

Assume no atmosphere; no friction; no extraneous factors. What is the terminal velocity of a mass that falls from the edge of Earth's gravity well to Earth's surface? Thank you in advance for your answer. Peace rwj

Homework Statement (b) If an object of 0.1 Solar masses fell into the Sun (starting at rest at infinity) calculate what its final speed and energy would be. Mass of the Sun = 1.99 x 10^{30} kg Radius of the Sun = 6.96 x 10^8 m The Attempt at a Solution Having done the rest of...

This is problem 67 in Chapter 10 of Halliday/Resnick/Walker 8th Edition. This is one of their three star (= hard) problems. I can get the beginning but then get stuck. A cylindrical chimney of height L=55m falls over. Treat it as a thin rod. Get the radial acceleration and tangential...

Homework Statement When Mongol drops his ball off the Hasselbluff Mountain Viewpoint, its height above the ground at time t is given by h = 64 - 1/2gt2. How long will the ball take to hit the ground? How fast is the ball going the instant before it hits the ground? Homework Equations I...

An egg of mass 5.8*10^-2 is dropped from a height of 1.5m onto a floor. Assuming air resistance is negligable, calculate for the egg: a) loss of potential energy. b) the kinetic enrgy just before impact. c) the speed just before impact d) the momentum just before impact. So far i have...

Dear all, I have been working my way through the Oxford University physics test sample paper http://www.physics.ox.ac.uk/admissions/combined-sample.pdf" and I have come across this question: A sky-diver jumps out of an aeroplane. Which of the following statements is true after she reaches...

Homework Statement A flash photograph of two tennis balls released simultaneously is taken. One is projected horizontally, and the other one is dropped from rest. The light flashes occur ever 0.2 seconds, and each box represents a distance of 0.4 s (they gave a graph...I can't get it on the...

I want to write a opengl (graphical) representation of a non-deformable ball or other shape in general being dropped onto a liquid surface. The surface will consist of a grid with surface maps. So I need to calculate I assume the wave equation in response to the object impact. Once I get the...

a small body, with the mass of M is dropped from an infinite height falling freefall, the air's friction on the body is defined by ==>f=-kv^2, k=const. find the velocity after an infinite amount of time. using Newtons 2nd law, F=ma=mg-kv^2 a=g-(kv^2)/m now, how do i find the velocity...

I was watching a NOVA program, and they claimed that if you were falling into a black hole, when you crossed the event horizon you would be vaporized by the intense light that's built up at the surface that hasn't been able to escape the BH. This seems plausible, I suppose, but I have never...

Hi, Hopefully somewone will know the calculation to find out the impact force for one person sitting on a chair and falling backwards with a full deaceleraton to a hard floor, what would the impact force be to the base of he head when stricking the floor. Chair is a chair with a bottom and...

Homework Statement http://members.shaw.ca/code/balls.JPG" Homework Equations I'm not sure what equations to use here, or even wether or not I need to use calc. Unfortunately we just started dynamics and most students don't know how to integrate yet (including me) v = dx/dt a =...

Homework Statement A gun is aimed directly at a can, which is simultaneously released when the gun is fired. This gun won't miss as long as the initial speed of the bullet is sufficient to reach the falling target before the target hits the floor. Verify this statement. Homework...

What is the instantaneous velocity of a freely falling object 10 s after it is released from a position of rest? What is its average velocity during this 10 s interval? How far will it fall during this time? I had asked a few friends for help and I keep getting mixed answers. v = gt 98m/s...

The Attempt at a Solution I think the first part is just 9.8 but I have no idea on the rest of the problem (this is due tomorrow need help)

1. A 50 g ball is released from rest 1.0 m above the bottom of the track. It rolls down a straight 30 degree segment, then back up a parabolic segment whose shape is given by y = 1/4x^2, where x and y are in m. There is a picture shown too, but I can't figure out how to get it in the post...

Homework Statement An object is released from a height of 50m. How far has the object traveled during the 3rd second of fall?Homework Equations d = Vi*T + 1/2at^2 Doesn't work though - answer provided is 24.5m. The Attempt at a Solution I did a simple distance at 3 seconds with 9.81 m/s^2 as...

Homework Statement A stick of length 0.8 m is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. Homework Equations w=sqrt(3g/2h) Should I use I=.5ML^2 or...

Homework Statement Use the impulse-momentum theorem to find how long a falling object takes to increase its speed from 5.50 to 9.00 . Homework Equations deltaP = impulse P = momentum (m*v) impulse = J (integral from ti to tf) The Attempt at a Solution 3.5 seconds, though, I knew...

Homework Statement A ball is thrown from top of a 25m tall building. The balls initail speed is 12m/s. At the same instant a person is running on the ground at the distance of 31m from the building. What must be the avg speed of the person if he is to catch the ball at the bottem of the...

What are the variables that determine the maximum diameter of a drop of liquid that will not disintegrate while falling through a gas (e.g. raindrop falling in air)?

If a turtle and beetle fall from the same height, which would sustain more injury? Assume that both the turtle and beetle are geometrically similar. The amount of force of which the creatures reach the ground would be the measured parameter, right? So, including air resistance in the equation...

Homework Statement A girl throws her set of keys to her friend upward who is in a window 3.90m above. the keys are caught later at 1.30s by the friends hand. Homework Equations a. With what initial velocity were the keys thrown? b. What was the velocity of the keys just before they...

Homework Statement A 3000 kg space vehicle, initially at rest, falls vertically from a height of 3500 km above the Earth's surface. Determine how much work is done by the force of gravity in bringing the vehicle to the Earth's surface. Homework Equations Gravitational potential...

Homework Statement In a "worst-case" design scenario, a 2000-kg elevator with broken cables is falling at 4.00 m/s when it first contacts a cushioning spring at the bottom of the shaft. The spring is supposed to stop the elevator, compressing 2.00 m as it does so. During the motion a safety...

[b]1. I recently had a lab on free falling and have all the data and percentage amounts from the data sheet, and Position vs. Time. I'm having a problem creating the slope for the velocity vs. Time. Do I use two different points or just one point? I used to different tangent lines...

I want to understand this: In the case of a dropped object, the horizontal component of the velocity with which the object hits the ground is not the same thing as the horizontal velocity itself, am i right? The horizontal component of the velocity when the object hits the ground means the...

Homework Statement A particle initially sits on top of a large smooth sphere of radius R. The particle begins to slide down the sphere without friction. At what angle . does the particle lose contact with the sphere? Homework Equations g=9.8m/s2 perhaps? (Is this dependent on the...

1. Neglect air resistance. A suspention bridge spand the colorado river at a height of 321 meters. Consider a 75kg bungee jumper, and a 200m bungee cord which obeys hooke's law (once it reaches its unstreched length). a) calculate the spring constant k, so that the jumper halts just above...

Use the position function s(t)=-49t^(2) + 200 which gives the height of an object that has fallen from a height of 200 meters. The velocity at time t = a seconds is given by the limit as t goes to a = (s(a) - s(t))/(a-t). At what velocity will the object impact the ground? I used V^2 = 2gh...

Homework Statement A ball is thrown straight upward and rises to a maximum height of 18 m above its launch point. At what height above its launch point has the speed of the ball decreased to one-half of its initial value? Homework Equations i don't know. The Attempt at a Solution...

"Consider an infinitely sharp pin of mass M and height H perfectly balanced on its tip. Assume that the mass of the pin is all at the ball on the top of the pin. Classically, we expect the pin to remain in this state forever. Quantum mechanics, however, predicts that the pin will fall over...

The max radius a fallling liquid drop can have without breaking apart is given by the equation: R=√(σ/gρ) where the rho is density of liquid (1000kg/m^3), and the surface tension is .7275J/m^2. g is gravity I am asked to determine the max radius of a drop in units of cm at 20...

I. A model rocket is launched straight upwards with an initial speed of 50.0 m/s. It accelerates with a constant upward acceleration of 2.00 m/s2 until it's engines stop at an altitude of 150 m. I found a thread with an extremely similar question, but the only reply that showed up was a...

Homework Statement A body of mass m is projected vertically upward with an initial velocity v0 in a medium offering a resistance k|v|, where k is a constant. Assume that the gravitational attraction of the Earth is constant. a) Find the velocity v(t) of the body at any time. b) Using the...

Homework Statement A certain freely falling object requires 1.50 sec to travel the last 30 m before it hits the ground. From what height above the ground did it fall? Homework Equations The Attempt at a Solution the answer is 38.2, but I cannot figure out what formula to use to...

Hi all, I apologise if I'm missing some elementary point here, I'm not a physicist, just an interested layman. Anyway, here's the question. We know of four fundamental forces: electromagnetic, weak, strong, gravity, which may or may not be unified at whatever energy. Which of these...

Homework Statement a rocket moves upward, starting from rest with an acceleration of +29.2 m/s^2 for 4 s. it runs out of fuel at the end of the 4 s and continues to move upward. how high does it rise? Homework Equations The Attempt at a Solution i tried using the equation...

a man driving his car on a straight road at 25m/s looks through his side windows and sees rain fallling at 30 degrees. when he stops he sees the rain is actually falling straight down(0 degrees). what is the velocity of the rain, relative to the car a- when the car is moving b- when the car...

Homework Statement A 50lg man jumps off a bridge 80m high. He lands in choppy salt water feet first. Each foot has an area of 75cm^2. The goal is to find out a) What is the force sustained by the human body while hitting then decelerating in the water. b) depth of penitration Because...

i was wondering what everyone thought they would see if they fell into a black hole. i know from relativity that from the perspective of me or you on earth, it would take an infinite amount of time for that person to fall in since as they approach the even horizon time dilation becomes very...

I spent some time to study general relativity recently and I found something that confuse me. According to my unserstanding about general relativity, the coordinate velocity of light should be (1-2GM/c2r)c, while the wavelength should be (1-2GM/c2r)1/2times its wavelength at infinity, for a...

I have created a piece of equipment that drops a steel weight, which weighs 5 lb, with a surface area of 1.69 sq. in. The weight can be dropped from 1' all the from 6'. The purpose of the piece of equipment is to test the durability of one of our products. The problem is we do not have the...

I'm a theatrical lighting designer wear a fall arrest harness while climbing in trussing. I can't find a calculation method for determining the weight put on the anchor point in the event of a fall. I weight 160 lbs. my lanyard is 6 feet long. It has no shock absorber so I would come to a...

A girl in a helicopter falls out when it was rising vertically at 10 m/s. The girl has a rope tied to her harness so she can be retireved. After 2.5 secs, how much rope has been pulled out of the helicopter? I know that this is essentially asking you to find the height that the helicopter...

I started working on a few "Babylon 5" related physics problems involving angular motion. It is easy to come up with problems that use formulas involving angular velocity and acceleration, rate of rotation, apparent "g"s, number of rotations that the space station completes in a given amount of...

Force Problem! Homework Statement a ball of mass 2.0kg is dropped from a height of 10m. the speed of the ball is measured as 12.5m/s just before it hits the ground. what was the work done against air friction during this fall? Homework Equations The Attempt at a Solution totally...