Engineering Mechanics Miscellaneous
- The figure shows a pair of pin-jointed gripper tongs holding an object weighing 2000 N. The coefficient of friction μ at the gripping surface is 0.1. XX is the line of action of the input force and YY is the line of application of gripping force. If the pin- joint is assumed to be friction less, the magnitude of force F required to hold the weight is
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For vertical equilibrium 2Fr = 2000 N
Fr = 1000 N
Fr = m . RN
1000 = 0.1 RNRN = 1000 = 10000 N. 0.1
Taking moment about P, we have
0.3 × F = RN × 0.150
0.3F = 10000 × 0.150F = 1000 × 0.15 0.3 = 10,000 × 15 = 5000 N. 30 Correct Option: D
For vertical equilibrium 2Fr = 2000 N
Fr = 1000 N
Fr = m . RN
1000 = 0.1 RNRN = 1000 = 10000 N. 0.1
Taking moment about P, we have
0.3 × F = RN × 0.150
0.3F = 10000 × 0.150F = 1000 × 0.15 0.3 = 10,000 × 15 = 5000 N. 30
- The ratio of tension on the tight side to that of the slack ride in a flat belt drive is
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T1 = eμθ T1 Correct Option: B
T1 = eμθ T1