block of weight mass. As a function of x, find (a) the tension in the wie,anef o

Question

block of weight mass. As a function of x, find (a) the tension in the wie,anef of (b) horizontal and (c) vertical components of the force on the the tion is defined by the distance x tröll th and from the hinge at A. 35 SSM www A cubical box is filled with sand and wei N. We wish to "roll" the box by pushing horizontally on one o upper e mum coefficient of static friction between box and floor quired? (c) If there is a more efficient way to roll the box, find smallest possible force that would have to be applied directly te the box to roll t. (Hint: At the onset of tipping, where is the normal force located?) weighs 890 n one of the What mini and floor is re- edges (a) What minimum force is required? (b) What the 36Figure 12-50 shows a 70 kg climber hanging by only the crimp hold of one hand on the edge of a shallow horizontal ledge in a rock wall. (The fingers are pressed down to gain purchase.) Her feet touch the rock wall at distance H=2.0 m directly below her crimped fingers but do not provide any sup- port. Her center of mass is distance a =0.20 m from the wall. Assume that the force from com the ledge supporting her fingers is equally shared by the four fingers. What are the values of the (a) horizontal component F, and (b) vertical component F, of the force on each fingertip? 37 In Fig. 12-51, a uniform plank, with a length L of 6.10 m and a weight of 445 N, rests on the ground and against a frictionless roller at the top of a wall of height h = 3.05 m·The plank remains in equilibrium for any value of 70 but slips if

Explanation / Answer

4*Fv=mg

Fv=mg/4=171.5N

also Reaction force at foot = 4*Fh

moment about centre of mass = 0

this gives

4*Fv*0.2-4*Fh*1-4*Fh*1=0

Fv=10Fh

Fh=Fv/10=17.15N

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