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The effort required to lift a load W on a screw jack with helix angle a and angle of friction | |
A. | Wtan(a + <)>) [Correct Answer] |
B. | Wtan(a-<)>) [Wrong Answer] |
C. | Wcos(a + |
D. | Wsin(a + <(>) [Wrong Answer] |
E. | W (sin a + cos |