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Part A The two blocks used in a measuring device have negligible weight. The spring is compressed 45 in. when in the position shown in (Egure 1). The end of the screw is smooth and the coefficient of static friction at all other points of contact is 0.20 Determine the smallest all force P which the adjustment screw must exerton B in order to start the movement of B downward Express your answer to three significant figures and include the appropriate units. View Available Hints) th P. 37.6 lb Figure 1 of 1 Submit Previous owers 20 lb/in * Incorrect; Try Again; 6 attempts remaining A 60° P Provide Feedback Next > 454 Pearson