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A 20 Kg Uniform Door Has a Width of 1

Question 20

Multiple Choice

  A 20 kg uniform door has a width of 1.2 m and a height of 2.5 m. The door is mounted on a post by a pair of hinges, marked 1 and 2, at the top and bottom of the door. An external force of 60 N, at an angle of 30° above the horizontal, is applied to the doorknob, as shown. The doorknob is 1.0 m above the bottom of the door.  -In the figure,the sum of the y-components of the forces,exerted on the door by hinges 1 and 2,is closest to: A) 145 N B) 165 N C) 195 N D) 225 N E) 250 N
A 20 kg uniform door has a width of 1.2 m and a height of 2.5 m. The door is mounted on a post by a pair of hinges, marked 1 and 2, at the top and bottom of the door. An external force of 60 N, at an angle of 30° above the horizontal, is applied to the doorknob, as shown. The doorknob is 1.0 m above the bottom of the door.
-In the figure,the sum of the y-components of the forces,exerted on the door by hinges 1 and 2,is closest to:


A) 145 N
B) 165 N
C) 195 N
D) 225 N
E) 250 N

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