2.79 The arm ABCD of the industrial robot lies in a vertical plane that is inclined at 40° to the yz-plane. The arm CD makes an angle of 30° with the vertical. A socket wrench attached at point D applies a 52-lb-ft couple about the arm CD, directed as shown. (a) Find the couple-vector that represents the given couple. (b) Determine the moment of the couple about the z-axis. 4.2 ft 40° 2.8 ft 30° 52 lb-ft
2.79 The arm ABCD of the industrial robot lies in a vertical plane that is inclined at 40° to the yz-plane. The arm CD makes an angle of 30° with the vertical. A socket wrench attached at point D applies a 52-lb-ft couple about the arm CD, directed as shown. (a) Find the couple-vector that represents the given couple. (b) Determine the moment of the couple about the z-axis. 4.2 ft 40° 2.8 ft 30° 52 lb-ft
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Transcribed Image Text:2.79 The arm ABCD of the industrial robot lies in a vertical plane that is
inclined at 40° to the yz-plane. The arm CD makes an angle of 30° with the
vertical. A socket wrench attached at point D applies a 52-lb-ft couple about the
arm CD, directed as shown. (a) Find the couple-vector that represents the given
couple. (b) Determine the moment of the couple about the z-axis.
4.2 ft
40°
Fig. P2.79
30°
52 lb-ft
6
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