Question: 4. A car jack has square teeth with two threads. The pitch is equal to 6 mm and external diameter 30 mm. Coefficient of friction

4. A car jack has square teeth with two threads. The pitch is equal to 6 mm and external diameter 30 mm. Coefficient of friction between the surfaces is f= 0.30. Vertical force, created by the weight of the car is 10 kN. a. What is the number of turns required to lift the car by 240 mm?

What is the force required to lift the car?
What is the force required to lower the car?
Is the jack self-locking?

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