Physics Corner

My worksheet says there are FOUR errors.

We only found one though (yesterday, remember)....wat do I do? Ya Allah!!!

I thought we found more than 1 error? I shall repost the list as well as some sources.

All waves require a medium to travel in
Not All waves.Some do not.

http://aspire.cosmic-ray.org/labs/wa...ave_motion.htm
Electromagnetic waves. Electromagnetic waves do not require a medium to travel. Examples of this type of wae include light and radio waves.

http://www.physicsclassroom.com/Class/waves/u10l1c.html
A mechanical wave is a wave which is not capable of transmitting its energy through a vacuum. Mechanical waves require a medium in order to transport their energy from one location to another.

Waves carry the medium from place tp place.
Waves do not carry the medium from place to place.Waves travel 'through' the medium.E.g: Sound waves reach your air by propagation of the medium upon which the sound waves travel , air.

http://www.ccmr.cornell.edu/education/ask/?quid=776
It’s important to note that the medium does not travel along with the wave—only energy moves from one place to another on a wave—although the medium does move back and forth or up and down as the wave passes

The hieght of the crest of the wave or the depth of the trough is the amplitude.
Nope! That one is def. wrong. I have the answer to that one n my textbook.

I can't see how that statement is wrong in any way.

http://rome.gema.state.ga.us/WebGema...b?OpenDocument
Amplitude: The maximum height of a wave crest or depth of trough.

http://www.physicsclassroom.com/Class/waves/U10L2a.html
The amplitude of a wave refers to the maximum amount of displacement of a a particle on the medium from its rest position.
In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position

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The distance between two crests is the wavelength.
Nothing wrong with this statement again (as far as i can see), however it may not be entirely accurate? The distance must be the horizontal distance between two consecutive/adjacent waves.

http://www.physicsclassroom.com/Class/waves/U10L2a.html
The wavelength of a wave is simply the length of one complete wave cycle. If you were to trace your finger across the wave in the diagram above, you would notice that your finger repeats its path. A wave has a repeating pattern. And the length of one such repetition (known as a wave cylce) is the wavelength. The wavelength can be measured as the distance from crest to crest or from trough to trough.

http://ww2010.atmos.uiuc.edu/(Gh)/ww...t/mch/sct.rxml

The number of waves per second is the frequency
Again, nothing wrong with the statment, however, it may not be entirely accurate.It may read more accurately when you insert the word 'complete'. ie, 'complete cycles'.

http://www.glenbrook.k12.il.us/gbssc...es/u10l2b.html
In mathematical terms, the frequency is the number of complete vibrational cycles of a medium per a given amount of time. Given this definition, it is reasonable that the quantity frequency would have units of cycles/second, waves/second, vibrations/second, or something/second

http://www.sciencescope.co.uk/frequency_of_a_wave.htm
The frequency (f) of a wave is the number of cycles that pass the observer in a given time. Hertz is the unit of frequency, and just means how many cycles per second.

Please donty take my answers/suggestions as something concrete, they are very likely to be wrong! Im in a bit of a rush now, (had to type this out twice) so i may have missed something.Hope it helps some anyway.

WWOOOWWWW a physics thread :awesome: ... I LOVE PHYSICS
but there doesnt seem to be much physics happening in here!!:rant:

http://www.physicsclassroom.com/
thats a really good site if any one needs help with physics

so.. is there any one here really in to physics? any one read a brief history of time? interested in nuclear physics?

hehe yeh i enjoy it.. come on.. its not that bad

well it could be that you dont actually understand the concept behind the question, if thats the case then i recommend that you make sure you understand the theory properly before you attempt to answer the questions. with physics you need a good understanding, especially of the basics, is very important.

or maybe you arent confident with calculations? perhaps you arent really a maths person? in that case i would suggest that you practise a lot, that way as you make more mistakes you can find your weaknesses, learn from them and hopefully learn not to repeat them. also when you practise more you become more used to the question style and that makes you more confident about how to approach questions and also refreshes your mind in regards to the thoery. it is a good way to help make sure the stuff sticks in you head.

hope that helps! i just finsihed high school a few weeks ago.. i miss physics already.. hehe dont be too about it ok

As salamu alikum

I found a few good sites recently.

http://www.physics.ro/ in particular http://www.physics.ro/modules.php?na...rticle&sid=163

63 physics lessons in flash. Difficult concepts explained and taught by sound and animation. This is a MUST SEE! for any student studying a-level physics.


http://www.physlink.com/Education/AskExperts/Index.cfm

The 'ask the expert' section on this website is really usefull. Lots of QA's which help you to understand the concept in mention easily.

http://www.phy.ntnu.edu.tw/ntnujava/

Loads and loads of java animations covering all aspects of physics.

Wa alikum salam

stating A2 work, have to do an investigation of my choice on a physics topic- intially excited but i can't think of anything, any ideas ? aim is so vague- thinking of doing something based on mechanics ?

I think the usual ones with Physics are the pendulum and spring one in mechanics, and measuring variables in circuits in electricty.

You should be able to find help here if you need anything, Insha'Allaah.



P.S. Threads merged.

i have just done my As physics exam and to tell you the truth i can't wait to drop physics, i absolutely hate it. I am not very good at physics but i think that if you enjoy the subject and can do it then you should carry on with it. physics is one of the hardest A level subjects so if you can do it you must be quite clever. anyway i have decided to carry on with biology, chemistry and maths for A2 in inshallah i will get good grades and do a really good course in University

Physics and maths are very closely related.

Best combination of A Levels to do is Biology, Chemistry, Maths and an Arts subject (English, Photography, Psychology?)

format_quote Originally Posted by Ameeratul Layl

Salam,

Is the resistivity of metal wire 'expected to' change when melted?

Wasalam

I think it should because resistance changes with heat/structure and resistivity is relative to resistance.