100.0 N 30.0 2.00 m 00 оо

$ 4 101 R F V A uniform, aluminum beam 9.00 m long, weighting 300 N, rests symmetrically on two supports 5.00 m apart. A boy weighing 600 N starts at point A and walks toward the right. (Figure 1) Figure < 1 of 1 % f5 5 T G B f6 Y H OD & N 7 B f8 * 4+ 00 8 M fg K ly 9 Part A How far beyond point B can the boy walk before the beam tips? VE ΑΣΦ ? 1 = Submit f10 | Request Answer Part B How far from the right end of the beam should support B be placed so that the boy can walk just to the end of the beam without causing it to tip? IVE ΑΣΦ ? 8:44 P 5/29/202 BA P 8 O 1 = Submit 99+ L alt Request Answer Pearson f11 hulu f12 ctrl [ + (6 = الالالال ins prt sc m ] pause m delete backspace ^ V home Review | Constants enter num lock T shift end 7 home ↑ A end

When you bend over, a series of large muscles, the erector spinae, pull on your spine to hold you up. Figure shows a simplified model of the spine as a rod of length L that pivots at its lower end. In this model, the center of gravity of the 320 N weight of the upper torso is at the center of the spine. The 160 N weight of the head and arms acts at the top of the spine. The erector spinae muscles are modeled as a single muscle that acts at an 12° angle to the spine. Suppose the person shown bends over to an angle of 30° from the horizontal. a. What is the tension in the erector muscle? Hint: Align your x-axis with the axis of the spine.b. A force from the pelvic girdle acts on the base of the spine. What is the component of this force in the direction of the spine? (This large force is the cause of many back injuries).

The figure shows a 4.20-kg, 1.80-m-long rod hinged to a vertical wall and supported by a thin wire. The wire and rod each make angles of 45° with the vertical. When a 10.0-kg block is suspended from the midpoint of the rod, the tension T in the supporting wire is 49.3 N. The wire will break when the tension exceeds 75.0 N. 45° 45° T 10kg Tipler & Mosca, Physics for Scientists and Engineers, 6e © 2008 W.H. Freeman and Company What is the maximum distance dmax from the hinge from which the block can be suspended? dmax 0.871 Incorrect m