Written Homework 1 Solutions

# Written Homework 1 - Physics221Fall2007 August28 Written HomeworkdueTuesday equalslOa physicsis the stutce.Oneshake A unit of time usedin

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Physics 221 Fall2007 Written Homework due Tuesday August 28 l--- A unit of time used in microscopic physics is the stutce. One shake equals lOa seconds. (a) How many times more (or less) shakes are in a second than there are seconds in a year? (b) Humans have existed for about 106 years, whereas the universe is about l0t0 years old. If the age of the universe now is taken to be l .0 "universe day" , fi how many "universe seconds" have humans existed? ^\ l - -- h\ /l:l'''hF=\ qls \-1 =\Y(=P) (+\(+\ ("\ t , -1.r(y\J S r\ ' \ o. ,1 qzcr- Nl\€ 3 . \l Tt rv\e 5 h ot€ SNNK€ S Pee s€ TF\{\N T\ea€ N{e S€ cor"rt S PEQ- Yqn R-, il \F \)E \eers-r€ \o\' ttl l Ttgs' \ott \trrnq ier*P-S NS .( \.\G xro,y€ N "r.)u\u€ LSAL IAY 'r *rLS 1l t\ "u ",v f r=irr'L if c'c,u.,, \) " }q '6<;'G<r (- \o c YcnL5 \o= *(EA&S ts ffi, lo - .t5' = K. ('\ Ut'rtv E[st\L ffiS/uuru,sec\ ")'v l Secotuog

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Physics 221Fall2007 Written Homework due Tuesday August 28 2--- Considerthefollowingvectors: A= 5i* 4i,B:2i+4i+ h C -41\D:2i+3k. (a) What is the magnitude ofA + B - g + D? (b) What is (A + B) x (C - D) in component form? (c) Which vector gives the smallest value of X dotted
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## This homework help was uploaded on 03/27/2008 for the course PHYS 221 taught by Professor Herrera-siklody during the Fall '08 term at Iowa State.

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Written Homework 1 - Physics221Fall2007 August28 Written HomeworkdueTuesday equalslOa physicsis the stutce.Oneshake A unit of time usedin

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