p113_hw1f05_sol

# p113_hw1f05_sol - Phys 113 Problem Set 1 Solutions 1 vc =...

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Phys 113 Problem Set 1 Solutions 1) 90 km h 1000 m 25 m s h 3600 s km c v == , 750 km h 1000 m 20.83 m s h 3600 s km t v () 25 m s cc x vt t , ( ) 0 100 m 20.83 m s tt t x xv t =+= + t ct x c = , 25 m s 100 m 20.83 m s =+ , ( ) 4.16 m s 100 m t = , 24 s 0.4 min t 2) No, a change in speed would indicate a change in the magnitude of velocity. Yes, the object could be changing directions while moving at a constant speed. Yes, speed is just the magnitude, which is always positive, of the velocity. No, speed is just the magnitude, which is always positive, of the velocity. 3) (a) 2 2 2.0 m 4.6 m s 1.1 m s x =− + ( ) 2 2 1 2.0 m 4.6 m s 1.0 s 1.1 m s 1.0 s 1.5 m x + = ( ) ( ) 2 2 2 2.0 m 4.6 m s 2.0 s 1.1 m s 2.0 s 2.8 m x + = ( ) ( ) 2 2 2 2.0 m
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