Written%204%20solutions

# Written%204%20solutions - Physics 221Fall20}7 18 Septernber...

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Physics 221Fall20}7 Written Homework due Tuesday Septernber 18 l-- A 3.5 kg block is pushed along a horizontal floor by a force F of magnitude 15 N at an angle of 40 degrees with respect to the horizontal (as shown in sketch). The coefticient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of the (a) frictional force on the block from the floor and (b) the acceleration of the block. \\ _--\r\c.se \rl s,"e 2?^= - \c.1X N) | trsu) c<)s'e = zwrci\ &= C.\1 ^/* { t-Fy= {u ^^T -\F\sr.'e :Q N [:,i\-r) 11 .t €") rtls N ) siN uto N= Ha.y t'J U. NJ \0,1( Nl / 7"N r +_L ,ff\

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q t 1qv.\d\$) Physics 221Fall2007 Written Homework due Tuesday September 18 2-- The two blocks, shown below, with m : 16 kg and M - 8S kg are not attached to each other. The coefficient of static fristion betrveen the blocks is p.r:0.38, but the surface beneath the larger block is frictionless. (a) Draw a free body diagram for each mass. (b) What is the minimum magnitude of the horizontal force, F, needed to keep the il -u N€€\ 2F: =?n* Tn f,N =C F-.rP* ^o\ t,dT [=NLIJ]3G TNS R€.chrti\€S Khiow\FrG N
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## This homework help was uploaded on 04/16/2008 for the course PHYSICS 221 taught by Professor Johnson during the Fall '06 term at Iowa State.

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Written%204%20solutions - Physics 221Fall20}7 18 Septernber...

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