Fall Definition and 903 Threads

1. To determine how high a cliff is, a llama farmer drops a rock, and then 0.800 s later, throws another rock straight down at a velocity of −10.0 m/s. Both rocks land at the same time. How high is the cliff? 2. I know some kinematics equations must be used 3. I am stumped...

I need help with a circuit. I need to run the signal in first image through a circuit that can clean up the exponential rise and fall edges and make it more linear. Can anyone help. http://picasaweb.google.com/davidanthonypitts/SignalWaveforms?authkey=5iLxB--Xdqs#

Homework Statement A man standing on the sidewalk throws a set of keys vertically upward to his wife in the window of their apartment 4.0 m above. The wife catches the keys 1.5 s later. (a) With what initial speed were the keys thrown? (b) What is the velocity of the keys just before they were...

Will oil prices rise in 2009? Or will the economy keep the prices down for a while?

Homework Statement A block of mass 3 kg is hung from a spring, causing it to stretch 6 cm at equilibrium, as shown below. The 3 kg block is then replaced by a 4 kg block, and the new block is released from the position shown below, at which point the spring is unstretched. How far will the 4...

I'm a second year physics major and I'm considering starting a co-op job doing research starting this summer. The outcome of this is that I would end up graduating in the fall, and my plan after school is to get a PhD. Since hardly any PhD programs start in the spring, I'd have a good 9 months...

So for the Autumn picture contest I chosed an awesome view of the Danube valley. Unfortunately the sun wasn't that bright that day. So the choice was scenery versus light. Scenery won, these were the losers:

Free Fall Trajectory So I am basically lost in what that means. I think it is the component method for vectors? Am I right? Some background on the lab: We rolled a marble down a curved ramp so that it went off the table and hit the ground in front of the table. (we marked where it hit with...

Homework Statement Water falls at the rate of 250 g/s from a height of 60 m into a 780 g bucket on a scale (without splashing). If the bucket is originally empty, what does the scale read after 2 s? Homework Equations p=mv F\Deltat=\Deltap The Attempt at a Solution So I assumed that the...

Homework Statement The string in a yo-yo is wound around an axle of radius 0.512 cm. The yo-yo has both rotational and translational motion, like a rolling object, and has mass 0.206 kg and outer radius 1.88 cm. Starting from rest, it rotates and falls a distance of 1.20 m (the length of the...

Homework Statement This isn't really a homework question that I have but more of a question i am trying to find out myself. When objects are near the surface of the earth, objects accelerate at an average of 9.8 meters per second^2. However when we get farther away from the earth, say have...

Homework Statement a ball is thrown straight down from the top of a 220 feet building with an initital velocity of -22ft/s. What is the velocity of the ball after 3 seconds? What is the velocity of the ball after falling 108 feet? Homework Equations s(t) = -16t^2 + Vi(t) + si...

Homework Statement A ball is dropped from 1.5 y(m) and hits the ground in .54 t(s). What is the value of g (m/s^2)? The accepted value of g = 9.8m/s^2 Homework Equations y=1/2gt^2 The Attempt at a Solution I'm getting this wrong, but this is my attempt. 1.5 = 1/2g x .54^2...

Homework Statement A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.20 m/s at an angle of 15.0° below the horizontal. It strikes the ground 3.00 s later. (a) How far horizontally from the base of the building does the ball strike the...

Homework Statement A stone is thrown upward at an angle of 51° above the horizontal. Its maximum height during the trajectory is 26 m. What was the stone's initial speed? m/s Homework Equations a=v2/r v2=vo2+2ax C=2\pir The Attempt at a Solution I figured the acceleration is...

A doctor, preparing to give a patient an injection, squirts a small amount of liquid straight upward from a syringe. If the liquid emerges with a speed of 1.5 m/s how long does it take for it to return to the level of the syringe? what is the maximum height of the liquid above the syringe...

Homework Statement Anthony is going to drive a flat-bed truck up a hill that makes an angle of 10 degrees wtih respect to the horizontal direction. A 36.0-kg package sits in the back of the truck. The coefficient of static friction between the package and the truck bed is 0.380. What is the...

It was such a beautiful day here in southern Ontario Barb and I decided to take a lil drive. We took a few photos on our trip. The Credit river valley is 2 minutes from our place, so we shot the fall colours. There are some beautiful colours right outside our apt. Next we drove to the area of a...

Hello friends, I am very new to this forum and I´d like to consult you if i have any questions. Currently I am studying basic physics for my ug. I´d really apreciate it if you could help me out. Homework Statement A ball is thrown straight up from the edge of the roof of a building. A...

1.what are the the constants of motion of a free fall body(treat this as a one-dimension motion,so there are two [independent] constants of motion )? 2.are they initial velocity and initial displacement？ 3.and i know the total energy(T+V) is one,but they are not independent with the...

It's that time of year again. Or as Bob Dylan would say, "the leaves, they are a-changin'." I just found this cool website with maps of where the leaves are at peak color for parts of the USA. They update twice a week; go to these links and click on "Current _____ report" to get the latest...

Homework Statement 45. A freely falling object requires 1.50 s to travel the last 30.0 m before it hits the ground. From what height above the ground did it fall? Homework Equations x = xi + Vit + (1/2)at2 Vf2 = Vi2 + 2ad The Attempt at a Solution First found the initial...

HELP! PLEASE concepts in free fall an object is thrown upwards, at the top of the path it has a) zero acceleration b) maximum momentum c) maximum kE d) is at equillibrium e)none of the above i know accelarion is 9.8m/s^2 i also know is not KE since at the top is potential im...

The moon's gravity is about one sixth of the Earth's. (Basically, one sixth of 9.80m/s^2). If two objects were dropped at the same height on the Earth and on the Moon, the time it would take for the object to reach the surface of the moon compared to the Earth is... a) 6 b) 36 c) Square root...

From what I understand, from a frame of reference outside a black hole, it takes an infinite amount of time for a test particle to cross the event horizon. But it takes finite time for any black hole to evaporate. It seems there is no horizon left to fall through.

Ok this sucks. This is the second time this year I'm down with a fever and flu. The first time it happened last semester it lasted for 2.5 weeks. I'm just wondering how often you guys fall ill on average annually.

Hi everyone! I have 7 questions here, I completed them all, but I’m not sure if I got them correct. I would greatly appreciate it if someone could have a look at them and let me know if I need to fix anything - I had the most trouble with question 3. Thank you so much for your time! :smile...

A flea jumps straight up to 0.390m. How long does it stay in the air from the time it jumps up to the time it lands? First of all, I found the initial velocity. with the initial velocity, i tried using the equation d = v1t + 1/2at^2 to get the time. but apparently it's wrong...;; How do...

Homework Statement an attacker at the base of a castle wall 3.65 m high throws a rock straight up with the speed 7.40 m/s at a height of 1.55 m above the ground. a.) will the rock reach the top of the wall? b.) if so, what is its speed at the top? if not, what initial speed must it have to...

Hi, Some time back I was saw a discovery documentary, can't remember the name, but in that somewhere they told that under free fall if possible to centre of earth, it will take around 32 Hrs or so.. No calculations or details were given. So I wonder will it take so much time or how...

A freely falling object requires 1.50 s to travel the last 30.0 m before it hits the ground. From what height above the ground did it fall? I have been working on this for a while and seem to be going wrong somewhere. I am unclear as to how free fall is meant here. I know that it need...

I am having trouble with this one. for all the formulas I tried I need the velocity, which they don't tell us in the problem. Any help would be appreciated . A stone falls from rest from the top of a cliff. A second stone is thrown downward from the same height 2.4 s later with an initial...

Homework Statement A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it taktes 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 way to the ground Homework Equations v=vo + at The...

AP free fall question (solved) Homework Statement I have problem with question b. A hot air bolloon is traveluing vertically upward at a constant speed of 5.00m/s. When it is 21.0m above the ground, a package is released from the balloon. a) for how long after being released is the...

Homework Statement A falling stone takes 0.28s to travel past a window 2.2m tall. From what height above the top of the window did the stone fall? The Attempt at a Solution Vo=?, the velocity at the top of the window a= -9.8m/s^2 t=.28s d=2.2m v=? Vo=(1/2at^2-d)/-t...

Hi all. I had grade 11 physics so I know the basics on physics.. grade 12 comes later this year... Anyways I was thinking about the systems in a jump, and the motion involved and I know motion physics work and all so don't get me wrong :P I'm not trying to disporve something here... I just know...

Homework Statement Suppose you adjust your garden hose nozzle for a hard stream of water. You point the nozzle vertically upward at a height of 1.5 meters above the ground. When you quickly move the nozzle away from the vertical, you hear the water striking the ground next to you for another...

Homework Statement Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, the hip’s speed at impact is about 2.0 m/s. If this can be reduced to 1.3 m/s or less, the hip will usually not fracture. One way to do this is by wearing elastic hip pads...

A ball is thrown upward with speed V. At the instant the ball is thrown, second ball is dropped from rest at a height H above the thrown ball, but not directly above it. Ignore air resistance. How much time elapses before the balls pass each other? Find a value of H such that the ball thrown...

Homework Statement A student at a window on the second floor of a dorm sees his math professor walking on the sidewalk beside the building. He drops a water balloon from 18.0 m above the ground when the prof is 1.00 m from the point directly beneath the window. The professor is 170 cm tall...

Homework Statement A brick falls from the top of a building and drops past a 2.0 m tall window in 0.20 s. Determine the distance between the top of this window and the top of the building. Homework Equations v^2 = (v initial)^2 + 2ax The Attempt at a Solution 10 ^2 = 2(9.8)x...

1. 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 1.2 seconds. Find the time it takes for the ball to fall from rest all the way to ground 2. Vf=Vo-gt, Vf^2=Vo^2-2g(delta y), Yf=Yo+Vot-1/2gt^2 3. I...

A ball, dropped from rest, covers three-sevenths of the distance to the ground in the last two seconds of its fall. (a) From what height was the ball dropped? _m (b) What was the total time of fall? _s For a, don't i need the final velocity to solve the problem? Vi=o A=-9.81? 2 days...

Homework Statement Aristotle believed that the time it takes for an object to fall a given distance is inversely proportional to its weight. Given objects A,B,C and D with weights of 10,40,20 and 30 grams, which one would have the heights terminal velocity if dropped from the same height...

Ok, I originally wanted to do only take 4 courses so I could work at least 20 hours a week. Now I feel the urge to graduate so I found a 5th course. I go to University of Houston Abstract Algebra Advanced Linear Algebra 1 Differential Equations Intermediate Analysis Managerial...

The rise and fall of evidence-based natural philosophy. The way we think of the external physical world — natural philosophy -- has in the past often been coloured by anthro’centric prejudice and personal egotism. This perspective has gradually been eclipsed by the secular ideal of...

I'm curious to peoples opinions of AMD, I have been using AMD over Intel for a few years however Intel just released the new centrino 2's and AMD share price is still falling. Will AMD be able to keep up? I originally thought it could soon be a good time to buy AMD shares as they have a...

I have read in a book that fall in a bh is the sameto go at c. Is it true?

I am looking for a formula to determine what speed an object will fall with a known height and weight. For example a 220 pound man falls from 65 ft, what speed will he be going when he hits the ground?

How come planets don't fall into stars as they orbit them? Einstein said a "space-time" curvature is caused because of the gigantic mass of the stars...why don't the planets orbiting these stars just fall right into them? Does it have something to do with the same reason why electrons never...