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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Vector Mechanics for Engineers Statics and Dynamics
Authors: Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell
8th Edition
73212229, 978-0073212227
