Answer Happy

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6. Calculate the coefficient of friction that just produces a zero effort in the last problem (i.e. the jack will screw down under the load with no effort) (0.063)

1. Calculate the horizontal force required to make a block weighing 60 N slide up a ramp inclined at 20° to the ground given u = 0.2 (Answer 36.4 N) 2. The pitch of a thread on a screw jack is 6.38 mm and the mean diameter is 30 mm. Calculate the torque needed to raise a load 500 N. The coefficient of friction is 0.51 (Answer 4.5 Nm) 3. A block weighing 600 N rests on an inclined plane at 12° to the horizontal. The coefficient of friction is 0.41. Show that the formula to slide the box down the plane is F = W tan (-a). Calculate the horizontal force required to slide it DOWN the plane. (Answer 109 N) 4. A turnbuckle is used to adjust the tension in a wire to 600 N. Each end has a single start square thread with a mean diameter of 10 mm and pitch of 2 mm. The coefficient of friction is 0.2. (Answer 1.6 Nm) 5. A screw Jack must raise a load of 500 kg. The thread has a pitch of 10 mm and a diameter of 50 mm. The coefficient of friction is 0.15. The effort is applied through a lever of radius 400 mm. Calculate the efficiency and the effort required to both raise the load and lower it. (29.5% and 66 N raising and 74.4% and 26.2 N lowering) 6. Calculate the coefficient of friction that just produces a zero effort in the last problem (i.e. the jack will screw down under the load with no effort) (0.063) 7. A lead screw and saddle arrangement is used to lift a load of 200 kg. The square thread has a pitch of 8 mm and a diameter of 30 mm. The coefficient of friction is 0.2. Calculate the torque needed to rotate the screw on raising and lowering. (8.53 and 3.31 Nm) 8. Calculate the coefficient of friction that just produces a zero torque in the last problem (i.e. the load lowers on its own) (0.085)