What is apple: Definition and 113 Discussions

An apple is an edible fruit produced by an apple tree (Malus domestica). Apple trees are cultivated worldwide and are the most widely grown species in the genus Malus. The tree originated in Central Asia, where its wild ancestor, Malus sieversii, is still found. Apples have been grown for thousands of years in Asia and Europe and were brought to North America by European colonists. Apples have religious and mythological significance in many cultures, including Norse, Greek, and European Christian tradition.
Apples grown from seed tend to be very different from those of their parents, and the resultant fruit frequently lacks desired characteristics. Generally, apple cultivars are propagated by clonal grafting onto rootstocks. Apple trees grown without rootstocks tend to be larger and much slower to fruit after planting. Rootstocks are used to control the speed of growth and the size of the resulting tree, allowing for easier harvesting.
There are more than 7,500 cultivars of apples. Different cultivars are bred for various tastes and uses, including cooking, eating raw, and cider production. Trees and fruit are prone to fungal, bacterial, and pest problems, which can be controlled by a number of organic and non-organic means. In 2010, the fruit's genome was sequenced as part of research on disease control and selective breeding in apple production.
Worldwide production of apples in 2018 was 86 million tonnes, with China accounting for nearly half of the total.

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  1. A

    Android Devices and Nerds (poll)

    Greetings folks. I have noticed that a lot of people into physics and math tend to use Androids (Samsung, etc), so here is a poll to see if that is true. I like both operating systems, but currently use a lower range Android, but am planning on getting a mid-range Android from Samsung instead of...
  2. H

    B Length Contraction: Apple Hanging from Tree & Earth

    Hello. Apologies, if this is already answered in other threads. Please redirect me, if that is the case. Imagine an apple hanging from a tree. Will there be length contraction between the apple and the earth in the frame of reference of the earth, as well as of the apple? All the best, Henrik
  3. C

    Pushing an apple underwater

    For this problem, The solution is, I agree with their solution from Archimedes principle, however, if I look at the equation ##PA = F##, where ##A = 4\pi r^2## and ##F## is the force over the entire apple assuming it is spherical. I thought the pressure will increase with depth and therefore I...
  4. Dex_

    Apple's new ARM CPUs vs, classic x86 for physics?

    Hi it's my first post here! I'm in my second year of my degree and looking to replace my computer. The new M-series chips seem like a better deal, however I am nervous that some software that might not be compatible with the ARM architecture. For more context on my workflow I do quite a bit of...
  5. jtbell

    Mini road trip: Apple of my eye

    I'm in Atlanta again (or rather, just outside it), on my longest road trip since my previous visit almost exactly three years ago, before the pandemic shut everything down. https://www.physicsforums.com/threads/mini-road-trip-dont-take-this-place-for-granite.983859/ I'm booked for three nights...
  6. B

    How to compare CPUs (for example Intel vs Apple)?

    Hi, Back in the day, I remember my PC going from a x286 to a x386, to a x486, then pentium. It was fairly easy to compare the changes, it was easy to notice the clock speed that was increasing, from 33Mhz for the x386 to the 300Mhz for the pentium. In the recent years, we seem to be reaching...
  7. Oldman too

    Apple AirTag detector for Android

    Cool open source Air tag detector here. From, https://www.bleepingcomputer.com/news/security/free-android-app-lets-users-detect-apple-airtag-tracking/ https://arxiv.org/pdf/2202.11813.pdf
  8. G

    How does the Apple pen II work?

    How does apple pen II work what is it’s principle , is the tip of pen same as optical mouse ? how can apple pen get charged when mangenetically on iPad Pro . thx for the help
  9. M3D1

    B How is 1N enough to move a 0.1kg apple 1 meter high?

    Example: How much energy is needed to lift an 0.1 kg apple up 1 meter? To hold a 0.1 kg apple against gravity needs 1 Newton of force: F = mg F = 0.1 kg × 9.8 m/s2 F ≈ 1 N But holding an apple is not work, the apple needs to move! So, raising it using 1 N for 1 m (both in same direction!)...
  10. Astronuc

    Isaac Asimov's Foundation Series on Apple TV+

    Previously, there was a possibility that HBO would make a series, https://www.physicsforums.com/threads/hbo-will-make-asimovs-foundation.781302/ but, https://www.bbc.com/culture/article/20210920-foundation-the-unfilmable-sci-fi-epic-now-on-our-screens Filmmaker David S Goyer was working...
  11. chwala

    Problem involving different numbers of apple, banana and mango trees

    I have done the working on the attached sheet, i got ##3## as the minimum. I do not have the mark scheme for this worksheet. Apple trees will have ##22## trees per row ( 3 rows in total). Bananas will have ##22## trees per row (4 rows in total). Mango trees will have ##22## trees per row (5...
  12. Y

    Chromebook vs windows vs Apple MacOS

    I am not asking about what is the difference between, I mainly interested in the popularity of them. I worked in the high tech industry, only one I saw people using was Windows, I only saw people in graphics design using Apple, never seen Chromebook. The school of my grand daughter gives every...
  13. M

    Apple MacBook keyboard shortcut

    Hi PF! I'm wondering if there is a way to customize the left-right shared screen keyboard shortcut on a Mac? It seems like all I can do is hover over the top-left of the green arrow to do this, no keyboard. Thanks so much
  14. kyphysics

    Any Recommendations for an Apple Compatible Ad Blocker?

    I don't use Apple products that much - although, I have an old iPAD. My older family members do however and some aren't the most tech literate/savvy. They accidentally will click on ads. Curious if there is a good ad blocker for Apple products that you'd recommend? Are these browser...
  15. Tom Hammer

    An apple falls from a tree, Does the moon move as a result?

    I am interested in the following thought experiment: an apple falls from a tree on Earth. Does the moon move (although slightly)? I can see an argument for it doing so—the center of mass of the Earth has moved slightly away from the moon, so the moon would feel a slightly smaller force and would...
  16. V

    Mechanical vibrations: floating apple

    Can someone double check my calculations? I will skip ##\theta## shift angle in all calculations for simplicity. ##x(t) = Acos(\omega t) \quad \land \quad \omega = \frac{2\pi}{T} \quad \land \quad A = \frac{1}{50}m = h## 1.1: ##x(\frac{1}{4}T)## = ? ##x(\frac{1}{4}T) = Acos(\frac{2\pi}{T}...
  17. H

    B Comparing sizes of atoms of an apple the size of the Earth

    it saids“if an apple is magnified to the size of the earth, then the atoms in the apple are approximately the size the size of the original apple” then why the atoms in the apple are "approximately" the size the size of the original apple, but not equal?
  18. FallenApple

    Job Skills Data Scientist Phone interview at Apple

    So I have a phone interview at Apple tomorrow. Are there any tips on what part of statistics I should review? I guess it wouldn't be helpful to do computations with matrix equations or derivations, but focus more on the concepts? I suppose I can review linear regression and logistic...
  19. TheQuestionGuy14

    B Another question about Gravity -- Does the apple attract the Earth?

    So recently I asked a question about a model of gravity I saw. Turns out I was misinterpretating it, it was the wronv source to use. Here is a video by PBS ( ) talking about what I was trying to say, that is that some people say 'The Earth rises to catch an apple, not vice versa. But, it...
  20. F

    Projectile Motion Problem (Physics 12) -- Apple core thrown from a tree

    Homework Statement A child sitting in a tree throws his apple core from where he is perched (4.0m high) with a velocity of 5.0 m/s [35 degrees above horizontal], and it hits the ground right next to his friend. A) How long is it before the apple core hits the ground? B) How far from the base...
  21. S

    Projectile motion thrown apple question

    Homework Statement A child sitting in a tree throws his apple core from where he is perched (4.0 m high) with a velocity of 5.0 m/s [35 degrees above the horizontal], and it hits the ground right next to his griend. a) How long does it take for the apple core to hit the ground? b) How far from...
  22. Greg Bernhardt

    Apple Watch Can Detect An Abnormal Heart Rhythm

    As I get older I am very closely keeping track of smart watches for their medical purposes. As someone who has heart disease in their family I am very interested in smart watches tracking cardio properties. Seems at last there is now real progress. Does anyone think this is worth getting a...
  23. artriant

    Falling apple inside a space centrifuge

    When a mass is in a circular motion and suddenly gets released by its centripetal force, it will continue traveling in a straight path (tangent to the circle and perpendicular to the radius in the moment of release) if no other forces acting. So let’s make a case: We have a space centrifuge...
  24. farolero

    B Relativity: Curving of Space & Mass Inflation Explained

    so i take that the apple doesn't fall but that the ground acelerates up by relativity this means the Earth inflates at a certain rate thing not noticed for the measure instrument inflates simultaneously but we feel the inertia effects of the ground moving up making things fall and keeping us...
  25. i-like-maths

    Microsoft vs Apple: which is better?

    I have lived with Microsoft all my life and have had pretty much no interaction with Apple. I want to know if Apple is any good and if it has any decent features to rival Windows features. Could anyone help?
  26. Samia qureshi

    Why Is It That An Apple Will Fall To The Earth?

    Why Is It That An Apple Will Fall On The Earth And Not That The Earth Will Live It Position And Move To Strike The Apple.is it just because that Earth has gravity. and Earth is a huge place very big material?
  27. B

    B Pilot Waves of Apple: Exploring the Physics and Possibilities

    Dear Physicsforums, Does the pilot waves of apple look like an apple? It was supposed to occur in configuration space and not in spacetime.. but isn't it configuration space is a possible spacetime since the pilot waves are supposed to be not just smokes and mirrors like the wave function in...
  28. Greg Bernhardt

    News Community Reacts to Apple vs FBI Story

    I'm very interested to hear what the PF community thinks of this story Here is the story http://www.wired.com/2016/02/apples-fbi-battle-is-complicated-heres-whats-really-going-on/ Here is the letter Tim Cook sent out http://www.apple.com/customer-letter/
  29. K

    Proof/Explanation to why bullet hits the apple

    I have a bullet with a initial velocity and an apple in free fall (-9.8 acceleration). Whenever I shoot the bullet it will hit the apple as long as the vector of the bullet is aimed at the apple. What I want to know is why does that occur? Why is it that as long as I aim the apple, the bullet...
  30. diegzumillo

    Apple and Worm: Patching holes in spacetime game

    I mean, I'm making a game, not making a gamer. I talked about making a gamer with my wife but she just grabs my head, analyzes, sees how big it is and says "nah, thanks". (this paragraph made sense because the topic title was "any gamers here?I am developing one") Anyway, the title of the game...
  31. Feeble Wonk

    Is Apple Music causing storage issues on iPhones?

    Is anyone else having problems with local storage on their iPhones after downloading Apple Music? I'm not even talking about the problems with my music files... which also is an issue. But my local storage has become so depleted that I can't even do basic app updates.
  32. Mojonski

    Why did Newton think the apple was pulled, not pushed?

    i was wondering, instead of thinking the apple was pulled down by some force to Earth , why didn't he think that there was a force pushed the apple down from above? , imagine when you leave in that particular year when he was alive.
  33. davenn

    Apple Introduces Macbook with Windows Support!

    Apple finally did it - A Macbook that supports Windowscheers Dave
  34. L

    Is there alcohol in apple cider vinegar

    I have searched here and a number of places online but I can't find an answer. Is there alcohol in Bragg's apple cider vinegar? I always get a strange slightly calm feeling after drinking two or three tablespoons in a big glass of water. But I can't imagine how there could be any alcohol in it...
  35. J

    Let's face It: Apple invented personal computers, mp3 players and smart phones

    Computers were lame until Apple made them. Funny how Bill Gates says "[Microsoft and Apple] were the 2 companies that really got the graphics interface." yet he believes the future of a tablet computer will be "one where I can use the pen" ... That's what he said in 2010, 3 years after Apple...
  36. Y

    How long would it take for an apple to fall to the earth

    How long would it take for an apple to fall to the Earth if it were as far away as the Moon and how do you calculate that? And, say the apple appeared out of nowhere stationary (relative to the Sun) at that distance, would the movement of the Earth leave the apple behind or would the apple...
  37. Algr

    Apple Swift programming language

    I used to program in Microsoft Quickbasic before MS abandoned it. I wasn't too advanced - my best program was a variant on Minesweeper. That was ages ago, but I'd like to get back into programing. Now Apple has this Swift programing language. Is swift a good choice for me?
  38. M

    MATLAB MATLAB Compatibility: Using MATLAB on PC and Mac - A User's Question

    hey pf! i had a question. my university uses MATLAB for computing on a PC. however, i am using a Macbook. do you think the two can sync with each other? i am waiting on purchasing MATLAB until i know for sure both an communicate with each other. thanks all!
  39. A

    Volume of apple juice

    A cylindrical container of height 1 m and diameter 0.5 m is partially filled with apple juice. When the container is lying on its side, the juice level at the deepest point is 37.5 cm (three eighths of a meter from the bottom of the cylinder is full). What is the liquid level after the container...
  40. U

    Apple Iphone 4: use siri while your phone is locked

    Hey to all you who are the owners of the iphone 4s with siri. I was freakin around on it early this morning and found out that you can use siri while your phone is locked. Siri will actually search the web for you without asking for a passcode, which will unlock your phone without a passcode...
  41. J

    C/C++ Apple XCode, C++, import text file

    I can't figure out why my text file isn't being found. I have it saved in the same location as my project. Anyone know how I can set where XCode checks for an fstream object? int main (int argc, char* const argv[]) { std::fstream file1("CollegeIsAWaste.txt", std::ios_base::in)...
  42. qspeechc

    News Apple Caught Price-Fixing E-Books.

    I did a search and I'm surprised no one has raised this topic yet. http://money.cnn.com/2012/04/11/technology/apple-doj-ebooks/index.htm http://appleinsider.com/articles/12/06/23/apple_e_book_price_fixing_trial_set_for_2013 Apple was found guilty of fixing the prices of e-books with several...
  43. S

    Force required to break tempered glass with apple?

    Hello! I'm new to the forums, have SOME physics under my belt as a civil engineering major. I have a hypothetical question to solve that has been driving me bonkers. At first, it sounded simple enough. Now, I must assume MANY things and don't know which set of equations to use to solve my...
  44. Petrus

    MHB Apple product in this forum

    Hello MHB, I am just curious about how many in this forum got apple product :) I got one apple product which is Iphone 4s. Is there also anyone against apple?Regards, |\pi\rangle
  45. T

    Schroedinger's Apple: A Quantum Flux Dessert

    This evening I enjoyed a dessert consisting of an unknown fruit emersed in chocolate pudding. I could not identify the fruit by its appearance, and when I consumed it, it took several seconds before I could identify the piece of fruit as a plum. I began to contemplate whether Schroedinger's...
  46. L

    Numbers App by Apple: Is It Good & Easy to Use?

    Hi. I was thinking about getting Numbers by apple to do data analysis for an intro to modern physics course and an optics lab. I was wondering if anybody thinks it is a good product and easy to use like most things apple?
  47. C

    Help on physics problem:distance Earth moves towards the apple

    Homework Statement When you drop a 400g apple, Earth exerts a force that accelerates it at -9.80m/s^2. The mass of the Earth is 5.98*10^24kg. The acceleration of the Earth as it falls towards the apple is 6.56 • 10^-25m/s^2. if the apple falls from a height of 5.00m, find the distance the...
  48. P

    Apple Rolling: Why Does It Always Roll on Its Side?

    I was walking down the street kicking and apple (why? I don't know) and I noticed that an apple, after a couple of bounces, always rolls on its side. It doesn't roll over it's stem continuosly. I was wondering why?
  49. W

    Calculating Torque on an Apple: Fx, Fy, Fz

    What is the magnitude of the torque about the origin of an apple at coordinates (-3.0, 0, 7.0) m due to force F whose only component is Fx = 2.0 N? What is the y-component of this torque? What is the magnitude of the torque if the force is Fx = - 2.0 N? What is the y-component of this...
  50. N

    Projectile Motion apple thrown

    Homework Statement A child sitting in a tree throws an apple core from where he is perched (4 m high) with a velocity of 5 m/s [35 degrees above horizontal] and it hits the ground next to his friend. How long before the core hits the ground? Homework Equations dy = vy(initial)t + 1/2at...