A uniform meter stick balances on a fulcrum placed at the 40 cm mark when a weight W is placed at the 30 cm mark. What is the weight of the meter stick?

$ 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

The top of the folding workbench has a mass of 36 kg with mass center at G. Calculate the magnitude of the force supported by the pin at E. 225 mm D G Answers: E = F E 670 mm 1000 mm H i N B 805 mm

Two children of mass 21 kg and 26 kg sit balanced on a seesaw with the pivot point located at the center of the seesaw. If the children are separated by a distance of 2 m, at what distance from the pivot point is the small child sitting in order to maintain the balance? m

6. A 1.5 m long board with a mass of 4.2 kg sits on top of a 3.0 m long board with mass of 1.5 kg that is balanced on a pivot, as shown in Figure. What is the distance d? d Figure 1

A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 53.0-gram mass is attached at the 26.0-cm mark, the fulcrum must be moved to the 39.2-cm mark for balance. What is the mass of the meter stick?________ g

Question 2:    #52   An 80 kg construction worker sits down 2.0 m from the end of a 1450 kg steel beam to eat his lunch, as shown in Figure below.  The cable supporting the beam is rated at 15,000 N.   Should the worker be worried?

T CW T 3. A 12 ft, 20 lb seesaw is balanced by a little girl (60 lb) and her father (180 lb) at opposite ends as shown below. How far from the seesaw's center of mass must the fulcrum be placed? CCW 0 A 60lb T = 60* (x + 6) +20 * x = 80x + 360 CCW 201b X = 180 (6-x) = 1080 - 180x = Tw 12ft 180lb 80x + 360 = 1080 - 180xx=2.77 ft.