Fall Definition and 903 Threads

I have to make up or find a problem that invovles free fall velocity AND relative velocity! Can anyone find/make up a problem for that? HELP!

Hey, I've been having some problems with finding out the rocket's maximum altitude and was wondering if anyone could help. The question information is: A 200kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 34.0 for 31.0 , then runs out of fuel...

Hey guys, I'm confused about this problem - On a planet far, far away, an astronaut picks up a rock. The rock has a mass of 5.80 kg, and on this particular planet its weight is 40.0 N. If the astronaut exerts an upward force of 43.3 N on the rock, what is its acceleration? I thought you...

A box of mass 12.5 kg rests on the flat floor of a truck. The coefficients of friction between the box and floor are mu_s = 0.190 and mu_k = 0.150 . The truck stops at a stop sign and then starts to move with an acceleration of 2.19 m/s^{2}. If the box is a distance 1.79 m from the rear of the...

Here's the question: A ball is dropped from rest from the top of a cliff that is 24 m high. From ground level, a second ball is thrown straight upward at the same instant that the first ball is dropped. The initial speed of teh second ball is exactly the same as that with which the first ball...

Hi, Can someone please check my work and tell me where I am going wrong? Rain is falling vertically downward with a velocity 25m/s. A cyclist is moving from North to South vith a velocity 15m/s. What is the velocity of the rain with respect to the cyclist? What is the direction the cyclist has...

"An Account of the Fall Of a Meteoric Stone..." This is a very interesting series of letters followed by a chemical analysis, concerning a meteor that exploded over South Africa in the 1830's. I happened to find it when searching for articles by M. Faraday in the archives of the Royal...

Hello, I'm not particularly looking for the answers in this problem as much as I am looking for the method to the solution. It's been giving me a headache. 1. Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration...

A rock is tossed straight up with a velocity of +20m When it returns, it falls into a hole 10m deep. What is the rock's velocity as it hits the bottom of the hole? So basically it is asking for the impact speed right? So that would be Vf^2=Vi^2 +2adelta(s) Vf^2=0+2*9.8*30.41 Vf^2=24.41 It...

Lets say you have a piston falling in a long cylinder. The piston weighs 100kg but only weighs 1kg under water. The cylinder is filled with water, but there is plumbing going from the bottom of the cylinder to the top. As the piston falls the water can move in a continuous loop, from the bottom...

free fall or what??!? I would like to know, if we are on a lift going upwards, and we happen to be standing on a weighing machine, why does our the value appears more than when we just weigh in the stationary lift??

Ok what do they do? How do they let the girl to know that? I mean for sure they don't tell the girl that they love her the moment they feel obssed with her. For sure it takes some time for them to let her know about their interest! I'm really terrible in knowing that. I don't want to be like 1...

Hello all, I've been having some problems regarding the fall of an object in the vertical direction that has air drag which varies quadratically with speed. The problem is as shown: A gun is fired straight up. Assuming that the air drag on the bullet varies quadratically with speed. Show...

We should have an award for the best fall guy, for me it would be a hard choise between Cyrus and penquin. :smile:

This is a basic question I always had trouble understanding. As moon is orbiting earth, is it coming close? Now it might be for other factors but my point is, Earth has some gravity force on it so even if something is orbiting earth, it should be coming to close to it unless it is fast enough...

Quenstion about netwonian mechanics. We have a small body that is moving against a very massive object with big density. For a given time t i want to know what can be the maximum distance of this object. So we have the mass of the big object M , the mass of the small m with speed Ua and the...

scheduled for release by Houghton-Mifflin in September https://www.amazon.com/gp/product/0618551050/?tag=pfamazon01-20 The Trouble With Physics: The Rise of String Theory, The Fall of a Science, and What Comes Next I think the reference must be to the rise of an exclusive string research...

Whenever I see footage of divers, free falling off a cliff into an deep ocean inlet, I empathize the sensation of danger they are facing. This prompted a question in my mind, that applies to both physics and biology. If the water is plenty deep and there are no obstructions between the cliff...

Hello, I am having some difficulty choosing a course to take for this fall. The course is to fill in my technical elective. I am already filling in my other tech electives with an advanced electronics class (with lab), advanced digital (with lab), and opto electronics (with lab). Now, I just...

Hi, I just recently posted this on the astrophysics forum but thought it would probably not quite fit so i decided to move it here. Hi, this is my first post. I have been trying to find an answer out of my own interest but is unable to do so. while searching I found this wonderful website. I...

i have this problem i can't seem to get i think i am overthinking but just can't get it what is. this is a one dimensional motion with constant acceleration.what is the acceleration of a space capsule fired from a 220m long cannon with a launch speed of 10.97km/s

If i have a barometer which reads 76cm of hg when kept in an elevator when the elevator is at rest . now the elevator starts going up with some acceleration . will the barometer read less than , greater than or equal to 76cm of hg . also explain why . what will happen if the barometer is under...

On planet Tehar, the free fall acceleration is the same as that of Earth, but there is also a strong downward electric field that is uniform close to the planet's surface. A 4.05 kg ball having a charge of 4.65 \mu C is thrown upward at a speed of 22.2 m/s, and it hits the ground after an...

why electron doesn't fall into nucleon in a atom?you know e has negative charge and nucleon has positive charge and they're very close in a atom, so why not?:confused:

EDIT: Thanks Hootenanny and Doc Al for looking and trying the problem. I figured out my mistake h_2 = h - \frac{h}{n} not h_2 = 1- \frac{h}{n} I've been working on this for a sick amount of time, please help me figure out what I'm doing wrong... The question is: Spiderman steps from the...

If it takes an object at distance x from the surface of the Earth 17.5 hours to fall from space onto the surface of the Earth, how can we calculate x? The object initially has zero speed. I find this question hard because I've only done problems involving acceleration as a function of time...

The equation for free fall at the surface of the planet Quixon is s = 3.8t2m with t in sec. Assume a rock is dropped from the top of a 400-m cliff. Find the speed of the rock at t = 6 sec. The problem is.. i don't know if the "m" is part of the equation or not.. like should i plug in the 400 as...

Since the nucleus of an atom is +charged and the electron is -charged, why doesn't at least one electron fall into the nucleus?

I recently saw an article in the paper about a woman who was sky diving and was unfortunate enough to have her parachutes fail. Information released about the situation said she fell from 30,000 FT was traving and 80km/h and landed in a concrete parking lot. Anyone have ideas how this was...

Why doesn't water fall down from a bucket while rotating it upside down? Also: 1)What causes sound when bombs explode? Is it the quick heating of air and compression something like sonic boom 2)How do the ariel fireworks go up and explode?

Heavier objects fall faster...myth or fact? (I'm not too good with history so correct me if I'm wrong.) pre-gallileo this is what people generally assumed. Gallileo actually did some experiments to show that all objects fall at the same acceleration. Then Newton provided the math and it was...

A roof tile falls from rest from the top of building. An observer inside the building notices that it takes 0.20 s for the tile to pass her window, whose height is 1.6 m. How far above the top of this window is the roof? I attempted this question about 2 or 3 different ways but they don't...

Heres the question: an 32.8 Newton object is in free fall.what is the mangniutude of the object if it encounters air resistance of 16.6 Newtons? I think you subtract cause air resistance cuts down force: 32.8 - 16.6 = 16.2 Newtons So am i right or do i need to use another equation?

Pepe, the clown, is jumping on a trampoline as Babette, the tightrope walker, above him suddenly loses her balance and falls off the tightrope straight toward Pepe. Pepe has just started upward at 15.0 m/s when Babette begins to fall. Pepe catches her in midair after 10.0s. a) How far has...

I draw a straight line representing the time line of the universe. On this line I put a mark at 1cm and I say this represents the end of the Planck Epoch. So I can understand how tiny the Plank Epoch was, could someone tell me, how far along the line at this scale the first second of the...

A bungee jumper (m = 75.00 kg) tied to a 48.00 m cord, leaps off a 78.00 m tall bridge. He falls to 8.00 m above the water before the bungee cord pulls him back up. What size impulse is exerted on the bungee jumper while the cord stretches? I found the velocity by v_final^2= V_inital + 2ad...

I am just looking for--or perhaps one of u could just post them--a list of physics motion equations in 1d, and freefall u know v=x/t v(f)=v(i)... v(f)2=v(i)2...etc thx

Here's the problem: Consider a particle of mass m whose motion starts from rest in a constant gravitational field. If a resisting force proportional to the square of the velocity (kmv2) is encountered, find the distance s the particle falls in accelerating from v0 to v1. I began with the...

Was it Aristotle who said that more massive objects will fall faster than lighter objects? This leads me to wonder: why didn't he just experiment with this idea to see that he was wrong? :confused:

I am curious as to why the moon doesn't fall into the earth. Did a few searches and found: https://www.physicsforums.com/archive/t-58667_Why_doesnt_the_moon_just_fall_to_the_earth?.html But that doesn't explain one thing. Moons orbit is not an exact circle. Its "almost" circular. So...

Hi, its me...AGAIN! You people should start CHARGING for your services! I have a conceptual problem more than just a homework problem this time. It regards free fall distance and the formula applied. Okey dokey...the formula to find out how far an object falls from rest is: d=1/2 gt^2...

ok how would i go about solving this an what equations do i use [SFHS99 2.P.40.] A worker drops a wrench from the top of a tower 89.0 m tall. With what velocity does the wrench strike the ground? (Assume the positive direction is upward.) wrong check mark m/s i have to use this...

Sometimes, almost every night, when I'm just about to fall asleep, my body shakes orjumps a few inches of the bed. can anyone explain this?

Fall semester: Intermediate Inorganic Analytical Chem Analytical chem lab Physical chem 1 physical chem 1 lab Advanced Eng. Math Contemporary Physics Contemp. lab :cry: Spring Semester: Quantum Mechanics Physical chem 2 Physical Chem 2 lab Linear Alg. Advanced Organic...

check this out: http://www.gre.org/grechanges.html so... it might be a good idea to wait until the changes are implemented, if possible, unless you want to be inundated with words that no one will ever know or use! i hope that kaplan is quick with its guides! :-p just givin'...

Building 7 was hit by no aircraft or debris. It had several small fires and amazingly collapsed in symmetrical fashion at free fall speeds. We saw in Madrid a building burn at intense levels for MANY hours but not collapse. Is there any scientific explanation for such a catastrophic...

Hi. I'm doing a KS3 coursework experiment whereby I need to investigate the question, 'Does the area of a parachute affect the rate of fall?' Obviously the answer is yes, however the theoretical physicist within me wanted to take this much further, so I attempted to pull together my basic...

if I threw a ball straight up (including air friction), would it take longer for the ball to drop back to its original position from its max height or longer for the ball to rise up to its max height? here's what I'm thinking, on the way up, there is air friction and mg going agaist the...

Now that the April 15th deadline has passed, I thought it would be a good idea to find out where all the new graduate students have decided to study. That way, you might be able to find other students going to the same school as you. I chose UC - Santa Barbara. If anybody else is going...

If I drop 2 of the same object but different mass like a pocket book and a encylopedia, they drop at the same time. Why is that? Anyone can get a detailed explanation? Thanks!