Bird Definition and 124 Threads

Homework Statement It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Assume a bird completes a circle of radius 6.00m every 5.00s and rises...

Homework Statement Having captured a mouse, an owl is flying towards the barn where it lives to enjoy dinner. While approaching the barn at a speed of 6.5 m/s at an upwards angle of 11o above the horizontal, the struggling mouse escapes from the talons of the owl while at an altitude of 6.3 m...

A fighter jet has 1 m^2 rcs and is located at 200nmi. Where would a flock of birds with 0.0015 m^2 rcs should be located in order to have the same detectability?

Hi, first time poster here- not college educated, as my handle suggest ... Just a regular guy :) I was reading "The physics book" today (Clifford A. Pickover) and came across the classic "drinking bird" where the body is filled with methylene chloride, the head covered in a felt material -...

Homework Statement The bird is fitted with a breathing apparatus, released on the moon could it fly? Homework Equations It doesn't violate any of Newtons laws, but I could be missing something. The Attempt at a Solution The best answer that is listed is that the question is in...

Minimum distance/energy bird flight problem. (SOLVED) SOLVED: Problem was just a simple arithmetic error (14 squared) Homework Statement A bird is released from point A on an island 5 mi from the nearest point B on a straight shoreline. The bird flies to a point C on the shoreline and...

A bird, whose feet are 3cm apart, perches on a bare "High tension" power line carrying a current of 720A. If the wire has a resistance of 80μΩ/m, calculate the potential difference between the bird's feet. Do you think the bird will be electrocuted? r = p * (L/A) I have the...

Homework Statement A man is flying a kite. The string of the kite makes an angle of 50 degrees with respect to the horizontal and exerts a pull of 15 Newtons. A small bird decides to sit on the kite and causes the kite to reach a new equilibrium position with the sting at 30 degrees with...

Homework Statement A bird watcher is hoping to add a particular song bird to the list of species she has seen. If a person, only 2.35 m from the bird, hears the sound with an intensity of 1.9 10-6 W/m2, how far could the bird watcher be from the bird and still hear it? Assume no reflections or...

Does Evolution has a role on beauty of "Wood Duck" bird? Hey there, Lately I had a debate with a person on internet on whether beauty of Wood Duck has any relation to Evolution or not. At first he claimed that Evolution has nothing to do with beauty of species, and only narrow-minded...

This video is very popular at the moment: http://m.wired.com/wiredscience/2012/03/human-bird-wings/ . While there are arguments stating that it is possible: http://gizmodo.com/5894904/man-flies-like-a-bird-flapping-his-own-wings , there are also some strange visual problems with the videos...

In many documentals on the Amazonian rainforest I can hear a bird' song but I don't think they ever showed it nor named it. In the following video you can skip up to minute 1:54 to listen to the bird. Apparently it is on the video, but I can't see it well at all. Do you have an idea about what...

Homework Statement You kick a ball at 20m/s at 40* from the horizontal, at the very top it hits a bird, stops immediately and fall straight down. vi=20m/s θ=40° I need to calculate the velocity right before impact the max height (height of collision) speed of ball when right before it hits...

a bird decided to fly into the house, and then tries to exit from the highest window in the house which cann't be opened and none of us can reach, I want to figure out a way to throw the thing out without hurting it. I'm thinking about waiting till dark and maybe leave a trail of lights (or...

A bird flies in a straight line directly over a field. Does the bird have angular momentum with respect to a man standing in the field?

Homework Statement Bird A and B are flying towards each other Bird B at 20m/s Bird A at 15m/s and screeches with a frequency of 3200 Hz what does bird B perceive? Homework Equations the speed of sound is 343m/s Fobserver==Fsource((vsound+vobserver)/(vsound+vsource) The Attempt...

if a bird sitting in a closed cage starts to fly what happens to its weight of the system What in open cage

Hello, Chitose wonder chick here again. ....... In my country, there are two popular healthy beverage call 'Brand's: essence of chicken' and 'Brand's: bird nest' In tv. they show that there two beverage has amazing effect to both brain and body, and they are VERY expensive. (especially...

Why anyone is not answering this question... Homework Statement a uniform rope of mass m hangs freely from the ceiling. A bird of mass M climbs up the rope with an acceleration A. the force exerted by the rope on the ceiling is Homework Equations T = mg + M(g+a) is answer The...

I am working on a scifi series. This question crosses both Aerodynamics and Exobiology topics. I thought it would be interesting to have a genus of nonsentient birdlike creatures on an alien planet and they can fly at supersonic speeds. What would the physiology of these creatures be? They...

Homework Statement A bird is caught in an updraft and ascends at a steady rate. Which has greater magnitude: gravity or aerodynamic force? Homework Equations The Attempt at a Solution Is it the aerodynamic force because the bird is moving up, against gravity?

Homework Statement The distance between two telephone poles is 46.0 m. When a 1.50 kg bird lands on the telephone wire midway between the poles, the wire sags 0.190 m. How much tension does the bird produce in the wire? Ignore the weight of the wire. Homework Equations F=maThe Attempt at a...

Homework Statement To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. In one such episode, a 620 g falcon flying at 20.0 m/s hit a 1.40 kg raven flying at 9.0 m/s. The falcon hit the raven at right angles to its original path and...

Homework Statement A bird has gathered electrical charge of .0001C by rubbing against another bird(I have no idea why the bird is doing this but...) and it is flying to a certain point where there is a thunderstorm brewing and a vertical electrical field of 5000N/C. What is the electrical...

From the CNN: http://scitech.blogs.cnn.com/2009/11/06/baguette-toting-bird-stalls-atom-smasher/ I hadn't heard about this except from here. Story: A piece of bread got into some external electronic equipment and caused a problem. It is thought a bird did it. I find it odd that the LHC...

Homework Statement I have a conceptual question related to the exact problem in this thread: https://www.physicsforums.com/showthread.php?t=125801 Homework Equations Same as in this thread: https://www.physicsforums.com/showthread.php?t=125801 The Attempt at a Solution My...

Homework Statement A bird stands on an electric transmission line carrying 2210 A, as seen in the figure below. The line has 3.32E-5 Ω resistance per meter and the bird's feet are 3.80 cm apart. What voltage does the bird feel? Homework Equations R=sigma(L)/A I=V/R The Attempt at a...

I had the garage door cracked open slightly, so that's how he got in. I have now opened the door fully, but he can't seem to find his way out. He flies to the back of the garage, perches on a box as if he's preparing to make a run for it. But when he flies toward the exit, he perches on the...

Homework Statement A bird watcher is hoping to add a particular song bird to the list of species she has seen. If a person, only 2.11 m from the bird, hears the sound with an intensity of 2.5 x 10^-6 W/m2, how far could the bird watcher be from the bird and still hear it? Assume no...

Would a bird strike impact with an in-flight jet propulsion intake have a significantly less probability of avoiding critical damage if the jet intake was fully idle or non-active at the point of impact? Would the air-flow pattern of an abruptly idled engine perhaps even help by greatly...

Here's my second scientifically as of yet unexplainable experience: There was a bird stuck between two panes of glass at my kitchen window. There was a small area where it got in, and it was flapping its wing like crazy flying all over the place in there, but wasn't smart enough to fly DOWN...

I have 2 birds on my patio. I thought I could look it up in my bird book, but it's not there. It is about the size of a black eyed junko, perhaps a tiny bit larger, has a dark grey patch/stripe from the top of it's beak (like a mohawk) going down to the back of the head. It has a wide brown...

Yum-yum eat'em up. http://news.nationalgeographic.com/news/2009/02/090218-extinct-bird-photo.html Burp. Well maybe now it's extinct?

This might be a fun project for some of our members that enjoy bird watching. It's a project by Cornell U that wants to gather information on bird sightings. I was thinking turbo might be a good source. I see Redbelly98 has been spotted...

I really thought I could have found this on the search function but hey, here goes! Homework Statement Two trains, each having a speed of 26 km/h, are headed at each other on the same straight track. A bird that can fly 60 km/h flies off the front of one train when they are 66 km apart and...

1.problem A 94 kg fullback moving east with a speed of 9.0 m/s is tackled by a 99 kg opponent running west at 3.0 m/s, and the collision is perfectly inelastic. (a) Calculate the velocity of the players just after the tackle. ___________________ m/s to the east (b) Calculate the decrease in...

Spider eats bird!?? Check this out, I discovered it at uglyoverload.com. I think this may be the main theme of my nightmares for a while. http://www.news.com.au/story/0,23599,24540399-5009760,00.html

Hi everybody, Last night I woke up with a weird question (maybe at 4 am) and the strange fact is that I remember it till now. My question is : say you see a bird borning and the bird only knows you and no one else nor even listen to a single other bird in its life. Can you teach it to...

Homework Statement Please bear with me. I'm a PhD student biologist struggling to remember some maths and physics, so I fear that this question may seem very simple to people using this forum. The problem I have is with some data I have on bird flight, measured using a radar. I have...

I'd rather be very picky about this. What's the best way to explain (to bright students) why there's no current in a bird when it sits on a high tension wire? i.e. when a student points out that it creates a parallel circuit with resistance in the wire in the ballpark of 5 times 10^-7 ohms...

[SOLVED] Bike Vectors Homework Statement A student bikes to school by traveling first d_N = 1.00 \rm {miles} north, then d_W = 0.400 \rm {miles} west, and finally d_S = 0.100 \rm {miles} south. If a bird were to start out from the origin (where the student starts) and fly...

[SOLVED] linear motion Homework Statement A bird is flying 30 m above a lake when it drops a fish. Another bird at 35 m immediatley dives and catches the fish before it hits the water. What is the initial velocity of the second bird? [b]2. Homework Equations h=h0 +...

I was wondering how bird strike works... I'm thinking that it's something to do with Newton's Laws which cause bird strikes to do so much damage. Can someone please guide me into some further research? thank you

this questions has been bugging me for a long time now: Imagine you are in a train, in a compartment, sitting there. Then suddenly you see outside of the window a bird that flies exactly at the speed of the train. It gets closer and closer, until it flies into the compartment through an open...

Check out this site; http://www.truthmed.org/ its about cheap alternative treatments that have been tried to cure bird flu. They make a very good case for hydrogen peroxide treatment of bird flu. I'm not sure what to think of it, if its true then drug companies are pulling a very unethical...

Homework Statement A bird lands near the tip of a branch and it is observed that initially it oscillates up and down, about once per second. Estimate how far the tip of the branch will be below its equilibrium position once the bird comes to rest. Homework Equations Newton's second law...

Homework Statement It is common to see birds of prey rising upward on thermals. The paths they take may be spiral-like. You can model the spiral motion as uniform circular motion combined with a constant upward velocity. Assume a bird completes a circle of radius 8.00 every 5.00 and rises...

Homework Statement A runner is jogging at a steady velocity of 3.4 km/h. When the runner is 4.1km from the finish line, a bird begins flying from the runner to the finish line at velocity 10.2km/h. When the bird reaches the finish line it turns around and flies back to the runner. Assume the...

using instantaneous vs. velocity/speed Two trains, each having a speed of 34 km/h, are headed at each other on the same track. A bird that can fly 58 km/h flies off the front of one train when they are 102 km apart and heads directly for the other train. On reaching the other train it flies...

A bird watcher meanders through the woods, walking 0.45 km due east, 0.70 km due south, and 2.75 km in a direction 43.0° north of west. The time required for this trip is 2.50 h. (a) Determine the magnitude and direction (relative to due west) of the bird watcher's displacement. Use kilometers...