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Solutions to Quiz #1

Question 1
An acre is equal to 160 square rods, where 1 rod = 5.5 yards and 1 yard = 0.914 meters. How many square meters are there in an acre? 

 

Question 2a (5 points)
A particle undergoes four displacements as follows: A = 80 m along pos. x; B = 60 m at 30^o above x; C = 40 m at 45^o above -x; D = 100 m at 60^o below -x. Graphical Solution 

 

Question 2b (5 points)
A particle undergoes four displacements as follows: A = 80 m along pos. x; B = 60 m at 30^o above x; C = 40 m at 45^o above -x; D = 100 m at 60^o below -x. Component Solution 

 

Question 3 (6 points)
If a force of 86 N parallel to the surface of a 20^o inclined plane will push a 120 N block up the plane at constant speed, what force parallel to the plane will push it down at constant speed? What is coefficient of kinetic friction?