Fall Definition and 903 Threads

A portable radio is sitting at the edge of a balcony 5.1m above the ground. The unit is emitting a sound uniformly in all directions. By accident, it falls from rest off the balcony and continues to play all the way down. A gardener is working in a flower bed directly below the falling unit...

Can anyone help me with any of these 3 questions? 1. Wrongly called for a foul, any angry basketball player throws the ball straight down to the floor. If the ball bounces straight up and returns to the floor 2.5s after first striking it, what was the ball's greatst height above the floor...

http://arxiv.org/pdf/astro-ph/0501590 The cosmic string theory for cosmological primordal petturbations has been ruled out.

There is a projectile that explodes into equal mass fragments at its highest point. One falls vertically with initial speed. I need to find where the other will strike the ground and the energy released during the explosion. I am given the mass(19.6kg), angle (56 degress), initial...

For much of human history China had a more advanced civilization and technology than Europe. Why did China fall behind Europe in technology? http://www.cba.uni.edu/economics/Gernes.pdf http://www.cronab.demon.co.uk/china.htm

I was given the situation, A rocket, initially at rest on the ground, accelerates straight upward from rest with constant net acceleration a , until time t1, when the fuel is exhausted. Find the maximum height H that the rocket reaches (neglecting air resistance). Express the maximum height...

Please help me to solve this question because I don't have a clue to do that! Q: In a bungee jump a volunteer of mass 70 kg drops from a bridge, tethered to his jump point by an elastic cable of unstretched length L = 20m and elastic modulus 3000 N. Ifnoring energy losses, and assuming he...

This isn't homework...I was just thinking through this rather morbid scenario and realized that I couldn't remember how to calculate the result I was looking for. The morbid scenario is person falling from a building of height h. How do you calculate the force exerted on the person by the ground...

I know its in orbit but things like the Hubble telescope need fuel don't they?

free fall with drag force If the equation F=-bv^2 describes the drag force of an object...then the differential equation for the object's motion would be: dv/dt= -g+bv/m or is it... dv/dt= g-bv/m After solving the equation, should I get... V=mg/b[1-e^(-bt/m)] Also, does this...

Heres the question: Some crickets can jump 21 cm, how long does it take the cricket to jump 7cm of that 21cm?

For those in the Northern Hemisphere (or the Southern Hemisphere, offset by 6 months), why does Fall feel the way it does?

Stock on Kerry in an IEM "free fall" Market Quotes: Pres04_WTA.html Quotes current as of 12:31:43 CST, Monday, September 27, 2004. Symbol Bid Ask Last Low High Average DEM04_G52 0.061 0.069 0.067 0.067 0.077 0.072 DEM04_L52 0.210 0.219 0.225 0.207 0.232 0.226 REP04_L52 0.230 0.231...

Q40. A boy stands at the edge of a bridge 20.0 m above a river and throws a stone straight down with a speed of 12.0 m/s. He throws another pebble straight upward with the same speed so that it misses the edge of the bridge on the way back down and falls into the river. For each stone find (a)...

''A DART LEAVES THE THROWER HAND HORIZONTALLY AT A height of 1.9m above the ground, calculate the time taken by the dart to reach the board and the horizontal velocity at which the dart left the throwers hand.'' this is what iv worked out x-0.4 u-? v-0 a-0 t-? i than went onto finding...

This class is killing me. Here's my problem: A woman on a bridge 91.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 2.70m more to travel before passing under the bridge. The...

Hi again, My first question has to do with vectors again. But it's not hard. I just can't see my mistake. The problem involves two displacement vectors. A which is 3.00km due south, and B which points due east. No value is given for B. However the resultant vector is 4.49km. So of...

A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes time 0.420 s to pass this window, which is of height 1.90 m. Question- How far is the top of the window below the windowsill from which the flowerpot fell? Take the free fall...

HOw can an egg fall from a high placeto the ground without breaking?

Help! Free Fall Problem A pellet gun is fired straight downward from the edge of a cliff that is 13 m above the ground. The pellet strikes the ground with a speed of 30 m/s. How far above the cliff edge would the pellet have gone had the pellet been fired straight upward?

A hot-air balloonist, rising vertically with a constant velocity of magnitude v=5.00m/s , releases a sandbag at an instant when the balloon is a height h=40.0m above the ground . After it is released, the sandbag is in free fall. 1.) Compute the position of the sandbag at a time 0.165s after...

Pleeeeeeeeeeeeeeeeease Help! A test rocket is fired vertically upward from a well. Acatapult gives it an initial speed of 79.2 m/s at ground level. Its engines then fire and it accelerates upward at 4.10 m/s^2 until it reaches an altitude of 950m. At that point its engines fail, and the...

A basketball player jumps 1 meter high off the ground, turns around and starts back down. Estimate the time she is within 30 cm of the top of her trajectory (her hang time.) (HINT: Calculate the time it takes to fall 30 cm from rest and double it.) Explain why that works note...

I've got: Analysis II: Hilbert spaces, Banach spaces, L_p spaces, Lebesgue measure & integration, etc. Textbook is Real Analysis by Royden Algebra III: noncommutative rings, modules, some categories, functors, tensor products, maybe some group representations, etc. Textbook is Algebra by...

A ball is thrown horizontally from a height of 15.75 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? I thought you might have to find time and I got t=1.79s, but after that I cannot seem find my way to the answer Thanks to whom ever can...

Stumped on free fall problem! This is probably an easy question, but I am stumped!A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the...

I am trying to find a velocity for an object that would launch it into space from Earth (straight up, NOT into orbit) and return exactly 8 days later. I cannot use x = v0t + 1/2at^2 (x=0 t=691200 a=9.8 [seconds in 8 days]) because the distance from the Earth changes in such a great way that...

"On Sept. 29, 2004 an asteroid the size of a small city will make the closest known pass of such a very large space rock anytime this century." "Toutatis looks something like a dumbbell hurtling awkwardly through space. It has a crazy rotation that makes normal days impossible. Scientists...

a small marble of mass m resting on the top of a smooth sphere of radius R. you nudge the marbles slightly and it starts rolling down the side. at what point (at what angle) on the sphere does the marble fall off the sphere? ans: 48deg ............... after reading my guess is that the...

I'm really bad at physics so please excuse me. But I would like some help on this question. I would like to be able to solve it without plugging in any numbers until the end. If a person steps off a building of height h, and free falls on the way down to the bottom. What is the height of the...

You are in the closed elevator with the apple. You feel weightless. So you want to know whether you're free falling or in the outer space. Place the apple about a meter away from your eyes. If the elevator is in free fall, the apple will move close to you slowly, but if you're in the outer...

Can anyone tell me why clouds float and don't fall down ? tx

Can this happen ? I mean really big meteors which can't be smashed or destroyed when coming near our Earth... Thank you

we have a pencil and you put the pencil with the spearhead of it downward (lets say in Earth and on a table), now you release your hand from the pencil to which direction will the pencil fall? after a few experiments will the direction be the same as the first observation?

I have read through the other free fall problems here on the boards and still cannot correctly solve the following: One-half second after starting from rest, a freely falling object will have a speed of about: a)10 m/s b)2.5 m/s c)5 m/s d)20 m/s I find the answer to be (b), 2.5 m/s, but...

the question is the topic, but I am sorri i don't have any numbers i can deal with, because we're just supposed to demonstrate that we understand how we solve htese porblems. unfortunately, I don't. could anyone just give me random numbers and tell me how to olve this question? thanks. I am...

a waterfall is 30 m high and 10000 kg of water flow over it every second A) calculate the potential energy PE = mgh got 2.94E6 joules B) calculate the power delevered by the water of all the potential energy is converted to work F = mA F= 10000 * 9.80 f = 98000 w = Fm w 98000 *...

I ran across this physics problem in class yesterday, it seems simple but...... (assume simplest case) ok...a screw at the top of an elevator that is traveling upwards comes loose and falls. Does the elevator speed going up effect the free fall time? (like does the elevator move toward the...

[SOLVED] Beyond Babylon: Europe's Rise And Fall "Do not think that I came to bring peace on earth. I did not come to bring peace but a sword" (Mat. 10:34). That bold statement of Jesus the Christ knocks down all the traditional images of "God with us." Jesus declared WAR - not peace - on...

Hi all, one simple question. You have two evenly long rows of dominos. In one row the dominos stand further apart than in the other. If you start both rows at the same time, which will be faster? My guess is the one with the stones closer because the dominos don't need to fall as deep as...

I heard somewhere that temperature actually begins to fall at dawn and then goes up later on. Does anyone know why this is? Thankyou.

Please help. The first question I don' know how to solve for distance because I don't have time in the formula. I've spent three days, and my friends and I are stumped, and had no-where else to turn, someone please help me. 1. You shoot a 30g bullet straight up at a velocity of 724m/s. How...

An object is releaseed from rest at time t = 0 and falls through the air, which exerts a resistive force such that the acceleration a of the object is given by a = g - bv, where v is the object's speed and b is a constant. If limiting cases for large and small values of t are considered, which...

Can anyone help me out with some free fall equations? and: Assume: g = 9.8 m/s A stone falls from rest from the top of a cliff. A second stone is thrown downward from the same height 2.1 seconds later with an initial speed of 41.16 m/s. They hit the ground at the same time. How long...

I'm sorry, I am just having difficulty with being sure of myself when it comes to these problems. This one states: A stone is dropped into a river from a bridge 43.9m above the water. Another stone is thrown vertically down 1.00 s after the first is dropped. Both stones strike the water at...

model rocket - free fall acceleration again :( The problem states: A model rocket fired vertically from the ground ascends with a constant vertical acceleration of 4.0 m/s^2 for 6.00 seconds. Its fuel is then exhausted, so it continues upward as a free-fall particle and then falls back down...

Consider a particle located at (x0, y0), having inital velocity v0, and the angle of inclination of the velocity vector is [the]. The particle is subjected to a vertical acceleration of -g. It's equation of motion is... x = x0 + v0*cos[the]*t y = y0 + v0*sin[the]*t - 0.5*g*t2 If t>0...

I suppose I am having trouble with this problem because there are no numbers given. Here is the problem: A ball is thrown down vertically with an initial speed of Vo from a height of h. a) What is its speed just before it strikes the ground? Speed is just the magnitude of instantaneous...

Need Help! Do objects of different mass fall at the same rate? If yes or no, why? Thank you.

Gravity? Did he fall or was he pushed? A. relatively simple question, is gravity a pulling force or a pushing force, or both?