07.10: Contact forces are exam6bjuen nrfg gox+r1zp 9q24.sjqs+ 0-j:8qjd ples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related e;qf6wm5 g5ax conceptually to the others?

  02.20: The graph shows the relationsw94 audf ef hnp(zw2wp2wr0v;fmcmts6 l +/,(hip between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph 2wh 9s04;zwwptdr+f/6f pvw le,m(n2af(c m uis a representation of the:

  10.15: Three blocks, labeled A,B, and C,uke*gypu b o28n9cd-. remain at rest on a table. The magnitude of the gravitational force on each block is indicateduoud ng-p.*eb 8k9c2y on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspendet q ;3nx,gfix/k(vtu 0d from a classroom ceiling by a series of strings as ;tv3fxq inu/ ,g(txk0shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and t 2jjk1j an0shjz / ,skq:njz);he mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the follo;j0akjnjn,1 zjj)hs :qs 2/zkwing choices represents the tension in the string connecting the masses?

  14.13: Which one of the following s6iyo 7/gsj* l+9/accnql vx xz6vc7y1 cientists is most associated with the following statement: “For small displacements of an object from equilibrium, there iz vnol/6q7yacc/vlx1+y7c i*6 gxjs9 s a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted amc+g 8 bfxv;r3t an angle of 3fgv;+mrc xb8 $\theta$. The block of weight mg is initially moving the right with speed $v$. The coefficient of friction between the rough floor and the block is $\mu$. The frictional force acting on the block is:

  95.34: A student pulls a wooden box along a ro3d,ydz13zjjq89 et g uugh horizontal floor at constant speed by means of a force P as shown to the right. Which of the folloq 8tyj9z,gdjd3z eu1 3wing must be true?

  99.08: A weight can be hung in any of the f kfvnsk02( - :iy*7nzrwte)uzollowing four ways. In which case is the string most likerws ki:entf2 *y-0k( zvzu)n7ly to break?

  96.39: Assume the objects in the following *sdy41cpa-c6y ka e13u wl.wpdiagrams have equal mass and the strings holding them in place are identical. In which case would the stringpw.-31pys a *6dl4caw ycuek1 be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one of,o+- fhg86o1 yqelkzuhkd 0dhb c4p/f4n6c+ f the following choihgfc8/ bhuf4kp hd4,f++nzeq-ook l 60cd6y1ces must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instauwr+e t,gz xf(w/ cl(*nt of time, the mass has position 2.0 m, velocity 3.0 m/sw,+cf rt *u(egxw/( lz,and acceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

  11.15: A 4.0 kg object is pushed to the right on a rough surface by kw3 8dn 45eawna horizontal force of 15 N as shownk4n 5ww 8d3nae, during the push, the object accelerates uniformly to the right at 2.5 $m/s^{2}$ . What must be the magnitude of the force of friction also acting on the object during the push?

  96.32: The 10.0 kg box shown in the figure to the right i)sesdr6q ok4+o ;2qm pyb-ie05nz ip7s sliding to the right along the floor. A horizontal force of 10.0 N oeb+py r)ie-o0 qn5; q 6m2zpk7ss i4dis being applied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane inclined at agn6wm*n; -sep n angle of $30^{\circ}$ with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?

  99.32: A wooden box is first pulled acl,3djr 5epkfhq,2-hcm; jyv 4ross a horizontal steel plate as shown in tjvkjfhc3,4 ,rq-;h eyml25d phe diagram A.
The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B. How does the force required to overcome friction in the inclined
case (B) compare to the horizontal case (A)?

  07.09: A block rests on an incline that makes the angle θ with thezh8n,7gmo 0 bk horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frict0nhbz go8,m 7kional force of the incline on the block

  01.11: A 5 kg block rests on a fy*8w yoc.xuf;lat plane inclined at an angle of $30^{\circ}$ to the horizon as shown in the diagram below.

What would be the acceleration of the block down the plane assuming the force of friction is negligible?

  01.12: If the block is placed on a second plane (where fricti,dvyg3+*lq .cdqlfh ; on is significant) in lq dfd.hcv3l g+y,*;qinclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational for)7dxn w 3drig31xu y+xce of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes shown in the figure? The y-axis is perpendicular to the incline’s surface whilex d3g1x7 d)y 3wrn+xui the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant speed on an incli g m(/b5 1wf; (wd,sugcmplifc:7cx5kl u5*xzned plane. The free body diagram of thelx 5xwcw; z(/:k 51ufupb(c5sd m,7il*f ggcm object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a block of mass u4 jo*wrd d0/vyog(. vM=6.0 kg with a constant speed of 5.0 m/s straight up a flat surfacedu*/d vw 4 vyg0r.(joo inclined $30^{\circ}$above the horizontal. The coefficient of kinetic friction between the block and the surface is μ = 0.40. What is the net force acting on the block?

  14.20: A uniform block of ma9c9kad/t9b5lh3t dts 1at-iw ss misplaced on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting from the incline on the block has a magnitude of 62 N while the force of static friction acting on the block has a magnitude of 38 N. The coead9/ 5ctwhk tti t1-sdbl a993fficient of static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of mass M is released from rest at the top of a frictionl*5 nx*knerfl v tx441e 7z-civess incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline rem vt*414eve*n k- nixlxf7zr c5ains at reston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?