Chapter 9 1 In opening a door, a P-40 N force is applied as shown in the figure

Question

Chapter 9 1 In opening a door, a P-40 N force is applied as shown in the figure below. (l et r-08 m and 60) Our goal will be to estimate the torque produced by F about point o 36. What component of F is normal to r? 39. Torque produced by F about point O UF, sino B) Foos ? C) Ftant) D) F arctan ? A) 0 B) 27.7 N C) 55.4N D) 16.0 N 37. What is the magnitude of the torque produced by F 40. Is this the most energy efficient way to open a about point O? door? A) Maybe; depends on r B) Yes B) rFtan 0 D) Maybe: depends on the coordinate system 38. Which dircction (if any) does the door swing? A) Up B) Down C) Clockwise D) Counterclockwise

Explanation / Answer

36) A) F*sin(theta)

F*cos(theta) is antiparallel to r

37) D) r*F*sin(theta)

38) C) clockwiswe

39) B) 27.7 N.m

T = r*F*sin(theta)

= 0.8*40*sin(60)

= 27.7 N.m

40) C) No

Because,
when theta = 90 degrees will be the most efficient way to open the door.

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