1. Calculate the horizontal force required to make a block weighing 60 N slide up a ramp inclined at 20° to the ground g

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1 Calculate The Horizontal Force Required To Make A Block Weighing 60 N Slide Up A Ramp Inclined At 20 To The Ground G 1 (58.49 KiB) Viewed 13 times

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 (B - 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)