W hen their s peeds bec ome c omparable to the s peed

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Unformatted text preview: s ee, the frequenc y drops as the energy (and s peed) inc reas es ; the partic les ' motion falls out of phas e with the puls ating voltage, res tric ting the c y c lotron's ability to ac c elerate the partic les further Rail Gun A Rail Gun us es elec tromagnetic forc es to ac c elerate a projec tile to very high veloc ities . The bas ic mec hanis m of ac c eleration is relatively s imple and c an be illus trated in the following ex ample. A metal rod of mas s and elec tric al res is tanc e res ts on parallel horiz ontal rails (that have negligible elec tric res is tanc e), whic h are a dis tanc e apart. The rails are als o c onnec ted to a voltage s ourc e , s o a c urrent loop is formed. The rod begins to move if the ex ternally applied vertic al magnetic field in whic h the rod is loc ated reac hes the value . As s ume that the rod has a s lightly flattened bottom s o that it s lides ins tead of rolling. Us e for the magnitude of the ac c eleration due to gravity . Par t A Find , the c oeffic ient of s tatic fric tion between the rod and the rails . Ex pre ss the coe fficie nt of sta tic friction in te rm s of va ria ble s give n in the introduction. Hin t 1. How to approach this problem The rod will begin to move when the forc e of fric tion is equal to the forc e due to the magnetic field. Hin t 2. F orce due to the magnetic field W hat is , the magnitude of the forc e on the rod due to the magnetic field in this problem? Give your a nsw e r in te rm s of va ria ble s give n in the introduction. session.master ing physics.com/myct/assig nmentPr intView?assig nmentID= 2252604 16/19 24 03 2013 HW- 5 Hin t 1. F ormula for the force on the rod The forc e on the rod is . Hin t 2. F inding the current through the rod W hat is , the c urrent through the rod? Rec all that . Give your a nsw e r in te rm s of va ria ble s give n in the introduction. ANSW ER: = ANSW ER: = Hin t 3. F rictional force W hat is , the magnitude of the max imum forc e due to s tatic fric tion? Give your a nsw e r in te rm s of va ria ble s give n in the i...
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