Bird Definition and 124 Threads

I know it's all about drag and lift, but why doesn't the wind drag this bird backwards?

Found this clutch of eggs in my front garden today, not 2 yards from the sidewalk. Have never seen any large bird take an interest in garden. Count: 3 Colour: solid white, maybe a faint tinge of green, like the heron egg in this pic. No speckles. Matte finish. Size: 55mm long, 40mm in diameter*...

How come the solution requires you to do mv^2/4 when the formula is just v^2 /r?

A bird is flying at an altitude of 10m above you, his angular position from your point of view is changing at 0.5 rad · s^-1. How fast is the bird flying when he is directly above you?

I am trying to understand how birds fly. If you consider a plane, using it's engine & streamline shape of the wings, it can create a low pressure region above the wings and high pressure region below and this makes it fly and the upward force is proportional to the speed. Birds seem to flap its...

What kind of bird is this? Anyone know?

I just posted a image due to overleaf newcommands and graph ok (a) if we use f(20) then the $B=0$ so their no weight gain. (b), (c), was a little baffled and not sure how this graph was derived...

What's really the difference between pressure and normal stress? Also I know pressure acts normal to a surface from the outside Do normal stress acts from inside? I'm reading bird transport phenomena and this is confusing

Here is the picture where person balancing a toy bird with using center of mass. I am bored with center of mass. I want to try same experiment with center of gravity. Is it possible to use center of gravity to balance bird toy ?

In a drinking bird, water from the wet on the outside of the head evaporates, causing the vapor inside the head of the bird to cool. This reduces the pressure of the vapor at the top, allowing the higher pressure in the lower bulb to push up the column of liquid. But the bird's body (including...

Homework Statement A bird flying in the air accelerates 2.82 m/s2 north for 4.11 seconds. the final velocity of the bird is 9.09 m/s [east]. What was the initial velocity of the bird? Homework Equations vf=v0+a*t v(average)=(v0+vf)/2 v=d/t d=v0t +½at2 tanθ=opp/adj The Attempt at a Solution...

Homework Statement Two trains, each having a speed of 30km/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 60 km apart and heads directly for the other train. On reaching the other train, the bird flies directly...

https://techcrunch.com/2019/01/02/netflix-pleads-with-people-to-stop-doing-the-bird-box-challenge/ People are driving with their eyes covered, wearing blindfolds for tasks that will get them hurt. Call it the Bird Box meme if you like. I prefer marginal insanity as a better label. Sounds like...

Hello! This is my first post here, and I look forward to many more! This is a sort of riddle I was told today, and left me full of doubts. So, the 'puzzle' was the following: " There's a man carrying behind his truck an enclosed trailer full of birds inside it. All the birds are standing on...

A bird is located at the (50, 8 ) m coordinate. A boy shot a rock at it using a slingshot with the elevation angle 37^{\circ}. How much velocity is needed for the rock to be able to hit that bird? I substituted all known variables (including the gravity acceleration 10m/s^2, with...

Homework Statement A bird can fly in still air at 100km/h. The wind blows at 90km/h from W(x degrees)S. The bird wishes to return to its nest which is due E of its present position. In which direction, relative to the air, should it fly?My textbook says that the velocity of the bird relative to...

Some birds are at the top of the tree while the others are at the botton, if one bird goes up, the birds of the top of the tree will be twice as the below of the tree while if one bird comes down the number of the birds at the top of the tree and below will be the same. How many birds are at...

Last week we saw this bird at the Sweetwater Wetlands in Tucson along the bank of a pond. The rigid upright position of the tail and the thickness at the base of the tail seemed to me to be the two most unusual features. Does anyone know what kind of bird it is? Thank you.

Quetzalcoatlus is a prehisotric bird that can weigh up to 500 pounds. I am so shocked how a bird weighing up to 500 pounds can fly. How is this possible? Wouldn't the bird be to heavy to fly? Does the bird defy the laws of physics?

I saw this while walking home today: I've seen it or one of its friends/relatives occasionally in the same area, over the years. It has a broad wingspan when flying. Unfortunately I wasn't quick enough to get a picture while it was in the air, and I couldn't get very close to it. This is in...

Homework Statement 0.5 kg bird lands on wire of telephone poles that are 50m apart. The wire sags 0.15m. What's the tension in the wire? Ignore weight of the wire Homework EquationsThe Attempt at a Solution I figured out the angle that would be created (0.34 degrees) when the bird lands and...

I am installing screening around my roofed deck. This is special stuff that's virtually invisible. My deck is well-shaded among dense trees, so that makes it even harder to see the screening. Birds visit my yard all the time, partly because of the foliage, and partly because I have a pond with...

99 Million-Year-Old Baby Bird Trapped in Amber Discovered in Myanmar https://www.yahoo.com/news/m/53c2c567-c77f-3c0d-a792-fccda32cdcc8/a-99-million-year-old-baby.html

Substitute teacher, Baraba Rose, convinced a class of kindergarden kids that she would turn into a bird before the school day ends. What is the probability that this event will take place? Solution: Let P = probability P(turning into bird) = 0 The answer is 0 because human beings cannot turn...

I bought the drinking bird toy, and I want to get a better understanding of it, (https://en.wikipedia.org/wiki/Drinking_bird) I understand the basic way it works and that it is a simple heat engine, but I can't seem to find any information that helps me answer the following - I notice all...

I'd like to purchase one of these books for self-study. The BSLK Introductory Transport Phenomena claims: "Devoting more space to mathematical derivations and providing fuller explanations of mathematical developments—including a section of the appendix devoted to mathematical topics—allows...

Here's a question makes me confused. A bird leaves its home to find some food. It won't return if it doesn't find any food. Suppose the probability it returns in the first day is 1/2 and returns in the second day is 1/4 and returns in the third day is 1/8 ... returns in the nth day is (1/2)^n...

I would love someone to verify the answer for equation 8 in this paper (bottom of page 263) http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2028.2002.00368.x/epdf For the sake of clarity here is the equation is LaTeX which you can render at the following link \frac{QC + Q\lambda \sigma -...

Homework Statement Canada geese migrate essentially along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 km/h. The one goose is flying at 100 km/h relative to the air but a 34 km/h wind is blowing from west to east. At what angle...

Homework Statement A bird m_b=0.470kg, is flying horizontally at v_b=2.50 m/s, not paying much attention, when it suddenly flies into a stationary vertical rod, hitting it d=25cm below the top. The rod is uniform, L=0.740m long, has a mass of m_r =1.60kg and is hinged at its base. This time the...

I found this baby bird in the parking lot with no trees above it. I have no idea how it got there. So I brought it inside and I don't know what to do. It keeps opening its mouth. What can I feed it? Is there any realistic chance this thing will survive? Thanks.

Homework Statement An angry bird of mass 2m is launched at theta = 45 degrees with initial velocity = 10 m/s above the horizontal. It then drops an egg of mass m= 1 kg vertically down with velocity 5sqrt(2) m/s when it is at the topmost point in its trajectory. (Bird's mass after egg drop is...

I was not aware of such a thing. http://www.huffingtonpost.com/2014/12/30/half-male-half-female-bird-cardinal-plumage_n_6392336.html?utm_hp_ref=birds

http://www.bbc.co.uk/programmes/b04v85cj I searched in this forum and no one has mentioned this. What are the thoughts of general physicists regarding Al-khalili presentation how the robin bird eyes use quantum entanglement? Searching at the net producing the following...

I need to purchase a device that will push something forward and backward continuously, in order to make wings flap like a bird. Linear actuators seem to be the right thing to buy, except these require pressing buttons to go forward and then back. What can I buy/what can I do that will allow a...

Homework Statement Birds can be seen perched on a high voltage power line yet seem unaffected by the high voltage. This is due to... A) Low resistance of the birds compared to the wire, minimizing current through the birds B) birds keeping only one foot on the wire, thus not completing a...

Homework Statement A sea bird catches a fish and then flies in an easterly direction with a speed v=7.39 m/s, h = 4.69 m above the surface of the sea. The fish has a mass of 115.3 g and is still alive. It thrashes and wiggles and as a result the bird drops the fish. i) What is the speed...

Hi, Is still there a bird group classified as Palmipedes? I can not find enough information in the internet for it and this is also the first entry in this science forum. Best Regards.

We used to have a bird thread here a long time ago, but it went dormant - maybe it's time for a new one? I need help identifying a bird. It's thrush-sized (~15 cm), nondescript brown-grey. I noticed it had unusual behavior: It perches on a branch, then flies out about a meter, does a...

OK so I am not sure if this should be on a physics forum, a maths forum or a biology forum. All I know is I am stuck. A little back ground: Researchers have modeled how various animals can see depending on their visual sensor cells, namely cones (colours vision) and rods (luminance)...

Every time I see news of a bird killing a jet engine I immediately wonder why some sort of screen cannot be placed over its inlet to either catch the bird or at least dice it into small pieces. Why is this not possible?

Homework Statement A 550.0g bird is flying horizontally at 2.20m/s , not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it 25.0cm below the top. The bar is uniform, 0.730m long, has a mass of 2.20kg , and is hinged at its base. The collision stuns the...

A bird is flying through the air with an airspeed of 12.6m/s heading 27.7*west of north. it is a windy day with the wind blowing at 8.95m/s heading 12.5* south of west. what is the velocity of the bird as seen by the person on the ground

1. A bird is gliding at an angle of 15° to the horizontal at a constant velocity. If the mass of the bird is 0.45 kg, calculate the lift and drag forces acting on the bird. 2.A bird is gliding with a constant velocity. Its forward speed is 5 m/s and its sinking speed is 0.88 m/s. If the...

The flight of a bird follows the curve x=t-cos(t), y=3-2sin(t)... where 0<=t<=4pi is the time in seconds. a) What times is the bird flying horizontally? find the (x,y) coordinates of the corresponding points. b) What times is the bird flying vertically? find the (x,y) coordinates of the...

Homework Statement A bird sits in a birdfeeder suspended from a tree by a wire, as shown in the diagram below. Let WB and WF be the weight of the bird and the feeder respectively. Let T be the tension in the wire and N be the normal force between the bird and the feeder. Which of the...

Hi I have a basic question. When birds sit on an overhead line, they are sitting on a bare conductor which is transmitting high power, but they don't get electrocuted. I think the answer is because the bird itself doesn't complete the circuit so current won't flow through them, but I don't fully...

Author: R. Byron Bird, Warren E. Stewart, Edwin N. Lightfoot Title: Transport Phenomena, Revised 2nd Edition [Hardcover] Amazon Link: https://www.amazon.com/dp/0470115394/?tag=pfamazon01-20 Prerequisities: Advanced Calculus, Differential Equations (ODE, PDE), Introductory Heat Transfer...

Homework Statement A bird dove under water and re-emerged with a fish. Following is the table which shows the bird's estimated flight: Time(s),Height(m) 0, 7 2, 10 4, 5 6, 0 7, 0 8, 3 Find a cubic equation to model the data. 2. The...