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please help me! i suck at physics. im doing a tutorial on electromagnetism now and ive got 3 qns. thanks for any help
1) A beam of electrons whose kinetic energy is K emerges from a thin foil window at the end of an accelerator tube. There is a metal plate a distance d from this window and perpendicular to the direction of the emerging beam. Show that we can prevent this beam from hitting the plate if we apply a uniform magnetic field of flux density B such that B> (2mk/e^2d^2)^0.5
2) A cyclotron is an accelerator in which a beam of energetic particles is produced. The charged partilces describe a spiral path of many turns at right angles to a constant magnetic field and are given an acceleration always in the same sense from an alternating electric field, each time they cross the gap between the two conductors ( dees). These charged particles then leave the cyclotron at the outer edge. Note that within the Dees, the charged particles are shielded from the electric fields by the copper walls of the Dees
a) if the charged particles were protons explain clearly how the alternating electric field provides the acceleration
b) show that the frequency of the applied voltage is independent on the radius of the orbit
c) show that the kinetic energy gained per cycle is 2qV where V is the magnitude of the voltage applied but V does not affect the final energy of the charged particles.

there are diagrams for each of the qns but i cant insert them. can anyone tell me how to insert the diagrams??
thanks!
Edited by jaydunkfull 04 Apr `08, 1:35AM
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hello friends
thanks for all the constructive advice and thanks for being the listening ear i need.
just to clear matters up. yes my dad is aware of the things going ard in the house, but hes not fully aware of everything. and he cant do anything much because hes seldom around the house and even he is being intimidated by the old bitch. he doesnt want conflicts to arise so hes playing the peacemaker on both sides. telling my grandmother to give in while telling the old bitch she shouldnt be doing this and that, but of course to no avail since the old bitch tyranises the entire household.
my grandma doesnt tell my dad things because she hates to trouble him.shes already living under his roof, so she tells me she tries not to create trouble for him as much as possible. and thats why she doesnt want to bother my dad. and thats what makes me sad because she is suffering in silence. and she doesnt want me to tell my dad what she confides in me and so i try to obey her wishes. otherwise she might not tell me that whenever she gets bullied again.
well as for the moeny part. i really have no say. im just worried that the bitch will manipulate my dad so that every single hard earned cent he makes goes to her and none to him. i dont care about myself. i can work and earn my own. im just worried about my dad. what about his retirement money? the company that he so painstakingly built up just taken away like that?
what i can do is limited. and i need to respect my dad's wishes. he doesnt want me to know much so whenever i try to ask about these affairs, he'll shun them and just change the topic telling me that i shouldnt be thinking or worrying about such things
i really hope he has a plan for himself. i dont see why i should make up a story just to get attention? i dont know why people would doubt me.
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my dad married this china bitch. she was the one who broke my family apart. ive seen her ugliness since i was a kid. when my dad bring my sis and i out on weekends, she'll call and bug him, make a lot of noise, accuse him of being with my mom still even though he was with us. she'll be damn loud and unreasonable with her ramblings and my dad would quarrel with her over the phone both sides screaming away while my sis and i would cower at the back seat of the car, watching and not daring to make a sound.
later on they got married and i had to meet her whenever i visited my dad. she was friendly and nice in front of us but i know there are many things going on that we didnt know. it was just a front she was putting on. so she worked with my dad in the office. slowly, she brought over more and more of her family. first it was her mom, then her sis and family, who were working for my dad, then her dad.
in the mean time, she convinced my dad to buy property. it wasnt in my dad's nature to invest so heavily as he has never done so all the while before he met this bitch. she convinced him to buy a merc. he even bought a unit at sentosa cove under the bitch's mom's name! it just struck me as weird that my dad was owning so much property. and he isnt making big money. im suspecting that all these property would eventually land in the hands of these chinese bastards.
so now they are living in this landed property. my dad, the bitch, the bitch's mom. my grandma their children and 2 maids. this old bitch(bitch's mom) is damn evil. she is very bad to my grandma and the maids. she'll verbally abuse my grandma and the maids, always scolding them and screaming at them. as though she was the one owning the house. screw her la. if not for my dad would she even be here? she'd order the maids around and once she even slapped one of them! even my grandmother (dad's mom) doesnt do that.she's like a bloody tyrant in the house. and everyone else, including my dad and grandma would give in to her. they are the ones compromising and listening to the old bitch. she stays on, citing the reason that she has to look after their kids. what bullshit. she doesnt do anything. its the maids looking after the kids and all she does is sleep and go to church.
there will be conflicts and my dad being the peaceloving kind would just give in to her. and my grandma too. that old bitch disconnects the phone so my grandma cant call people. and my grandma is bed ridden so she cannot defend herself.
that f old bitch doesnt give the maids enough to eat. for lunch, there would just be the two old people and the maids at home. she would disallow the maids to cook more than one dish. this is abuse man. they eat only rice and one dish, which is usually vege call that lunch. how is that enough?! and no one dares to stand up to her.
that old bitch is f unreasonable. so shell make a lot of noise saying we are the ones who are driving her away and keep threatening to want to go home back to china. and to appease matters, my grandma was asked to coax her to come back and live with them ( she went away to stay with her other daughter after one of the conflicts) like what nonsense is this. she is the one who is in the wrong and we are the ones who are always giving in to her. even my grandma is being bullied by her you know! and all she can do is keep quiet and shou wei qu.
like what the hell and my grandma called me and told her over the phone crying. and i dont know how to help you know. i feel so helpless. i dont want to see my grandma suffer and get bullied like that
screw those bloody china people. havent they done enough damage to my family, to many other families, to many people's ricebowls
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my favourite couple is jac and merrylin! =] theyre so jovial and humourous. even though theyre not the best looking pair, they come across as the most fun loving couple, the pair that will make you laugh. says a lot about how looks =/= love, doesnt mean youre ugly and fat, no one will want you and you wont find love. thats not true!
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do you guys face problems of sweaty feet when you wear covered shoes? and you cant wear socks cos it just doesnt go with it. when you wear pumps and flaties you dont wear socks right? then your toes will get warm and stuffy after a while and the insides of your shoes get wet? isnt it uncomfortable? i always wonder how some can wear pumps and flatties the whole day without feeling uncomfortable.
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heres a picture
www.yofla.com/flash/3d-rotate/references.php
scroll down and click on the deuter backpack. this is the bigger version i think. theres a smaller one
Edited by jaydunkfull 03 Mar `08, 12:52PM
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deuter backpacks are no longer available in singapore, no? the range im refering to is the one that was quite popular few years back among students, quite sleek. it has a grey/black base and comes in a few colours. recently i saw this range from zinc, looks quite similar to the deuter backpack. theres this round like hump thingy at the top then a grey patch at the bottom. im thinking of getting one, but i cant find it. anyone knows which branch has? i tried the zinc at some neighbourhood malls but they dont carry it. =(
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its not that i dont know how to do. i know how to do it, the method and the steps, but i just cant get the answer.
its damn frustrating cos you kinda know that you know how to do it, but you just cant bloody get that final answer. and for math, theres only one freakin answer.im sick of it already la
stupid vectors, stupid de
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